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1/*
2 * Copyright © 1997-2003 by The XFree86 Project, Inc.
3 * Copyright © 2007 Dave Airlie
4 * Copyright © 2007-2008 Intel Corporation
5 * Jesse Barnes <jesse.barnes@intel.com>
6 * Copyright 2005-2006 Luc Verhaegen
7 * Copyright (c) 2001, Andy Ritger aritger@nvidia.com
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
26 *
27 * Except as contained in this notice, the name of the copyright holder(s)
28 * and author(s) shall not be used in advertising or otherwise to promote
29 * the sale, use or other dealings in this Software without prior written
30 * authorization from the copyright holder(s) and author(s).
31 */
32
33#include <linux/ctype.h>
34#include <linux/list.h>
35#include <linux/list_sort.h>
36#include <linux/export.h>
37
38#include <video/of_videomode.h>
39#include <video/videomode.h>
40
41#include <drm/drm_crtc.h>
42#include <drm/drm_device.h>
43#include <drm/drm_modes.h>
44#include <drm/drm_print.h>
45
46#include "drm_crtc_internal.h"
47
48/**
49 * drm_mode_debug_printmodeline - print a mode to dmesg
50 * @mode: mode to print
51 *
52 * Describe @mode using DRM_DEBUG.
53 */
54void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
55{
56 DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
57}
58EXPORT_SYMBOL(drm_mode_debug_printmodeline);
59
60/**
61 * drm_mode_create - create a new display mode
62 * @dev: DRM device
63 *
64 * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
65 * and return it.
66 *
67 * Returns:
68 * Pointer to new mode on success, NULL on error.
69 */
70struct drm_display_mode *drm_mode_create(struct drm_device *dev)
71{
72 struct drm_display_mode *nmode;
73
74 nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
75 if (!nmode)
76 return NULL;
77
78 return nmode;
79}
80EXPORT_SYMBOL(drm_mode_create);
81
82/**
83 * drm_mode_destroy - remove a mode
84 * @dev: DRM device
85 * @mode: mode to remove
86 *
87 * Release @mode's unique ID, then free it @mode structure itself using kfree.
88 */
89void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
90{
91 if (!mode)
92 return;
93
94 kfree(mode);
95}
96EXPORT_SYMBOL(drm_mode_destroy);
97
98/**
99 * drm_mode_probed_add - add a mode to a connector's probed_mode list
100 * @connector: connector the new mode
101 * @mode: mode data
102 *
103 * Add @mode to @connector's probed_mode list for later use. This list should
104 * then in a second step get filtered and all the modes actually supported by
105 * the hardware moved to the @connector's modes list.
106 */
107void drm_mode_probed_add(struct drm_connector *connector,
108 struct drm_display_mode *mode)
109{
110 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
111
112 list_add_tail(&mode->head, &connector->probed_modes);
113}
114EXPORT_SYMBOL(drm_mode_probed_add);
115
116/**
117 * drm_cvt_mode -create a modeline based on the CVT algorithm
118 * @dev: drm device
119 * @hdisplay: hdisplay size
120 * @vdisplay: vdisplay size
121 * @vrefresh: vrefresh rate
122 * @reduced: whether to use reduced blanking
123 * @interlaced: whether to compute an interlaced mode
124 * @margins: whether to add margins (borders)
125 *
126 * This function is called to generate the modeline based on CVT algorithm
127 * according to the hdisplay, vdisplay, vrefresh.
128 * It is based from the VESA(TM) Coordinated Video Timing Generator by
129 * Graham Loveridge April 9, 2003 available at
130 * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
131 *
132 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
133 * What I have done is to translate it by using integer calculation.
134 *
135 * Returns:
136 * The modeline based on the CVT algorithm stored in a drm_display_mode object.
137 * The display mode object is allocated with drm_mode_create(). Returns NULL
138 * when no mode could be allocated.
139 */
140struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
141 int vdisplay, int vrefresh,
142 bool reduced, bool interlaced, bool margins)
143{
144#define HV_FACTOR 1000
145 /* 1) top/bottom margin size (% of height) - default: 1.8, */
146#define CVT_MARGIN_PERCENTAGE 18
147 /* 2) character cell horizontal granularity (pixels) - default 8 */
148#define CVT_H_GRANULARITY 8
149 /* 3) Minimum vertical porch (lines) - default 3 */
150#define CVT_MIN_V_PORCH 3
151 /* 4) Minimum number of vertical back porch lines - default 6 */
152#define CVT_MIN_V_BPORCH 6
153 /* Pixel Clock step (kHz) */
154#define CVT_CLOCK_STEP 250
155 struct drm_display_mode *drm_mode;
156 unsigned int vfieldrate, hperiod;
157 int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
158 int interlace;
159 u64 tmp;
160
161 if (!hdisplay || !vdisplay)
162 return NULL;
163
164 /* allocate the drm_display_mode structure. If failure, we will
165 * return directly
166 */
167 drm_mode = drm_mode_create(dev);
168 if (!drm_mode)
169 return NULL;
170
171 /* the CVT default refresh rate is 60Hz */
172 if (!vrefresh)
173 vrefresh = 60;
174
175 /* the required field fresh rate */
176 if (interlaced)
177 vfieldrate = vrefresh * 2;
178 else
179 vfieldrate = vrefresh;
180
181 /* horizontal pixels */
182 hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
183
184 /* determine the left&right borders */
185 hmargin = 0;
186 if (margins) {
187 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
188 hmargin -= hmargin % CVT_H_GRANULARITY;
189 }
190 /* find the total active pixels */
191 drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
192
193 /* find the number of lines per field */
194 if (interlaced)
195 vdisplay_rnd = vdisplay / 2;
196 else
197 vdisplay_rnd = vdisplay;
198
199 /* find the top & bottom borders */
200 vmargin = 0;
201 if (margins)
202 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
203
204 drm_mode->vdisplay = vdisplay + 2 * vmargin;
205
206 /* Interlaced */
207 if (interlaced)
208 interlace = 1;
209 else
210 interlace = 0;
211
212 /* Determine VSync Width from aspect ratio */
213 if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
214 vsync = 4;
215 else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
216 vsync = 5;
217 else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
218 vsync = 6;
219 else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
220 vsync = 7;
221 else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
222 vsync = 7;
223 else /* custom */
224 vsync = 10;
225
226 if (!reduced) {
227 /* simplify the GTF calculation */
228 /* 4) Minimum time of vertical sync + back porch interval (µs)
229 * default 550.0
230 */
231 int tmp1, tmp2;
232#define CVT_MIN_VSYNC_BP 550
233 /* 3) Nominal HSync width (% of line period) - default 8 */
234#define CVT_HSYNC_PERCENTAGE 8
235 unsigned int hblank_percentage;
236 int vsyncandback_porch, __maybe_unused vback_porch, hblank;
237
238 /* estimated the horizontal period */
239 tmp1 = HV_FACTOR * 1000000 -
240 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
241 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
242 interlace;
243 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
244
245 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
246 /* 9. Find number of lines in sync + backporch */
247 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
248 vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
249 else
250 vsyncandback_porch = tmp1;
251 /* 10. Find number of lines in back porch */
252 vback_porch = vsyncandback_porch - vsync;
253 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
254 vsyncandback_porch + CVT_MIN_V_PORCH;
255 /* 5) Definition of Horizontal blanking time limitation */
256 /* Gradient (%/kHz) - default 600 */
257#define CVT_M_FACTOR 600
258 /* Offset (%) - default 40 */
259#define CVT_C_FACTOR 40
260 /* Blanking time scaling factor - default 128 */
261#define CVT_K_FACTOR 128
262 /* Scaling factor weighting - default 20 */
263#define CVT_J_FACTOR 20
264#define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256)
265#define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
266 CVT_J_FACTOR)
267 /* 12. Find ideal blanking duty cycle from formula */
268 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
269 hperiod / 1000;
270 /* 13. Blanking time */
271 if (hblank_percentage < 20 * HV_FACTOR)
272 hblank_percentage = 20 * HV_FACTOR;
273 hblank = drm_mode->hdisplay * hblank_percentage /
274 (100 * HV_FACTOR - hblank_percentage);
275 hblank -= hblank % (2 * CVT_H_GRANULARITY);
276 /* 14. find the total pixels per line */
277 drm_mode->htotal = drm_mode->hdisplay + hblank;
278 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
279 drm_mode->hsync_start = drm_mode->hsync_end -
280 (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
281 drm_mode->hsync_start += CVT_H_GRANULARITY -
282 drm_mode->hsync_start % CVT_H_GRANULARITY;
283 /* fill the Vsync values */
284 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
285 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
286 } else {
287 /* Reduced blanking */
288 /* Minimum vertical blanking interval time (µs)- default 460 */
289#define CVT_RB_MIN_VBLANK 460
290 /* Fixed number of clocks for horizontal sync */
291#define CVT_RB_H_SYNC 32
292 /* Fixed number of clocks for horizontal blanking */
293#define CVT_RB_H_BLANK 160
294 /* Fixed number of lines for vertical front porch - default 3*/
295#define CVT_RB_VFPORCH 3
296 int vbilines;
297 int tmp1, tmp2;
298 /* 8. Estimate Horizontal period. */
299 tmp1 = HV_FACTOR * 1000000 -
300 CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
301 tmp2 = vdisplay_rnd + 2 * vmargin;
302 hperiod = tmp1 / (tmp2 * vfieldrate);
303 /* 9. Find number of lines in vertical blanking */
304 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
305 /* 10. Check if vertical blanking is sufficient */
306 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
307 vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
308 /* 11. Find total number of lines in vertical field */
309 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
310 /* 12. Find total number of pixels in a line */
311 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
312 /* Fill in HSync values */
313 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
314 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
315 /* Fill in VSync values */
316 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
317 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
318 }
319 /* 15/13. Find pixel clock frequency (kHz for xf86) */
320 tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
321 tmp *= HV_FACTOR * 1000;
322 do_div(tmp, hperiod);
323 tmp -= drm_mode->clock % CVT_CLOCK_STEP;
324 drm_mode->clock = tmp;
325 /* 18/16. Find actual vertical frame frequency */
326 /* ignore - just set the mode flag for interlaced */
327 if (interlaced) {
328 drm_mode->vtotal *= 2;
329 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
330 }
331 /* Fill the mode line name */
332 drm_mode_set_name(drm_mode);
333 if (reduced)
334 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
335 DRM_MODE_FLAG_NVSYNC);
336 else
337 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
338 DRM_MODE_FLAG_NHSYNC);
339
340 return drm_mode;
341}
342EXPORT_SYMBOL(drm_cvt_mode);
343
344/**
345 * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
346 * @dev: drm device
347 * @hdisplay: hdisplay size
348 * @vdisplay: vdisplay size
349 * @vrefresh: vrefresh rate.
350 * @interlaced: whether to compute an interlaced mode
351 * @margins: desired margin (borders) size
352 * @GTF_M: extended GTF formula parameters
353 * @GTF_2C: extended GTF formula parameters
354 * @GTF_K: extended GTF formula parameters
355 * @GTF_2J: extended GTF formula parameters
356 *
357 * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
358 * in here multiplied by two. For a C of 40, pass in 80.
359 *
360 * Returns:
361 * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
362 * The display mode object is allocated with drm_mode_create(). Returns NULL
363 * when no mode could be allocated.
364 */
365struct drm_display_mode *
366drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
367 int vrefresh, bool interlaced, int margins,
368 int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
369{ /* 1) top/bottom margin size (% of height) - default: 1.8, */
370#define GTF_MARGIN_PERCENTAGE 18
371 /* 2) character cell horizontal granularity (pixels) - default 8 */
372#define GTF_CELL_GRAN 8
373 /* 3) Minimum vertical porch (lines) - default 3 */
374#define GTF_MIN_V_PORCH 1
375 /* width of vsync in lines */
376#define V_SYNC_RQD 3
377 /* width of hsync as % of total line */
378#define H_SYNC_PERCENT 8
379 /* min time of vsync + back porch (microsec) */
380#define MIN_VSYNC_PLUS_BP 550
381 /* C' and M' are part of the Blanking Duty Cycle computation */
382#define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
383#define GTF_M_PRIME (GTF_K * GTF_M / 256)
384 struct drm_display_mode *drm_mode;
385 unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
386 int top_margin, bottom_margin;
387 int interlace;
388 unsigned int hfreq_est;
389 int vsync_plus_bp, __maybe_unused vback_porch;
390 unsigned int vtotal_lines, __maybe_unused vfieldrate_est;
391 unsigned int __maybe_unused hperiod;
392 unsigned int vfield_rate, __maybe_unused vframe_rate;
393 int left_margin, right_margin;
394 unsigned int total_active_pixels, ideal_duty_cycle;
395 unsigned int hblank, total_pixels, pixel_freq;
396 int hsync, hfront_porch, vodd_front_porch_lines;
397 unsigned int tmp1, tmp2;
398
399 if (!hdisplay || !vdisplay)
400 return NULL;
401
402 drm_mode = drm_mode_create(dev);
403 if (!drm_mode)
404 return NULL;
405
406 /* 1. In order to give correct results, the number of horizontal
407 * pixels requested is first processed to ensure that it is divisible
408 * by the character size, by rounding it to the nearest character
409 * cell boundary:
410 */
411 hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
412 hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
413
414 /* 2. If interlace is requested, the number of vertical lines assumed
415 * by the calculation must be halved, as the computation calculates
416 * the number of vertical lines per field.
417 */
418 if (interlaced)
419 vdisplay_rnd = vdisplay / 2;
420 else
421 vdisplay_rnd = vdisplay;
422
423 /* 3. Find the frame rate required: */
424 if (interlaced)
425 vfieldrate_rqd = vrefresh * 2;
426 else
427 vfieldrate_rqd = vrefresh;
428
429 /* 4. Find number of lines in Top margin: */
430 top_margin = 0;
431 if (margins)
432 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
433 1000;
434 /* 5. Find number of lines in bottom margin: */
435 bottom_margin = top_margin;
436
437 /* 6. If interlace is required, then set variable interlace: */
438 if (interlaced)
439 interlace = 1;
440 else
441 interlace = 0;
442
443 /* 7. Estimate the Horizontal frequency */
444 {
445 tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
446 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
447 2 + interlace;
448 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
449 }
450
451 /* 8. Find the number of lines in V sync + back porch */
452 /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
453 vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
454 vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
455 /* 9. Find the number of lines in V back porch alone: */
456 vback_porch = vsync_plus_bp - V_SYNC_RQD;
457 /* 10. Find the total number of lines in Vertical field period: */
458 vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
459 vsync_plus_bp + GTF_MIN_V_PORCH;
460 /* 11. Estimate the Vertical field frequency: */
461 vfieldrate_est = hfreq_est / vtotal_lines;
462 /* 12. Find the actual horizontal period: */
463 hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
464
465 /* 13. Find the actual Vertical field frequency: */
466 vfield_rate = hfreq_est / vtotal_lines;
467 /* 14. Find the Vertical frame frequency: */
468 if (interlaced)
469 vframe_rate = vfield_rate / 2;
470 else
471 vframe_rate = vfield_rate;
472 /* 15. Find number of pixels in left margin: */
473 if (margins)
474 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
475 1000;
476 else
477 left_margin = 0;
478
479 /* 16.Find number of pixels in right margin: */
480 right_margin = left_margin;
481 /* 17.Find total number of active pixels in image and left and right */
482 total_active_pixels = hdisplay_rnd + left_margin + right_margin;
483 /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
484 ideal_duty_cycle = GTF_C_PRIME * 1000 -
485 (GTF_M_PRIME * 1000000 / hfreq_est);
486 /* 19.Find the number of pixels in the blanking time to the nearest
487 * double character cell: */
488 hblank = total_active_pixels * ideal_duty_cycle /
489 (100000 - ideal_duty_cycle);
490 hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
491 hblank = hblank * 2 * GTF_CELL_GRAN;
492 /* 20.Find total number of pixels: */
493 total_pixels = total_active_pixels + hblank;
494 /* 21.Find pixel clock frequency: */
495 pixel_freq = total_pixels * hfreq_est / 1000;
496 /* Stage 1 computations are now complete; I should really pass
497 * the results to another function and do the Stage 2 computations,
498 * but I only need a few more values so I'll just append the
499 * computations here for now */
500 /* 17. Find the number of pixels in the horizontal sync period: */
501 hsync = H_SYNC_PERCENT * total_pixels / 100;
502 hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
503 hsync = hsync * GTF_CELL_GRAN;
504 /* 18. Find the number of pixels in horizontal front porch period */
505 hfront_porch = hblank / 2 - hsync;
506 /* 36. Find the number of lines in the odd front porch period: */
507 vodd_front_porch_lines = GTF_MIN_V_PORCH ;
508
509 /* finally, pack the results in the mode struct */
510 drm_mode->hdisplay = hdisplay_rnd;
511 drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
512 drm_mode->hsync_end = drm_mode->hsync_start + hsync;
513 drm_mode->htotal = total_pixels;
514 drm_mode->vdisplay = vdisplay_rnd;
515 drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
516 drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
517 drm_mode->vtotal = vtotal_lines;
518
519 drm_mode->clock = pixel_freq;
520
521 if (interlaced) {
522 drm_mode->vtotal *= 2;
523 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
524 }
525
526 drm_mode_set_name(drm_mode);
527 if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
528 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
529 else
530 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
531
532 return drm_mode;
533}
534EXPORT_SYMBOL(drm_gtf_mode_complex);
535
536/**
537 * drm_gtf_mode - create the modeline based on the GTF algorithm
538 * @dev: drm device
539 * @hdisplay: hdisplay size
540 * @vdisplay: vdisplay size
541 * @vrefresh: vrefresh rate.
542 * @interlaced: whether to compute an interlaced mode
543 * @margins: desired margin (borders) size
544 *
545 * return the modeline based on GTF algorithm
546 *
547 * This function is to create the modeline based on the GTF algorithm.
548 * Generalized Timing Formula is derived from:
549 *
550 * GTF Spreadsheet by Andy Morrish (1/5/97)
551 * available at https://www.vesa.org
552 *
553 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
554 * What I have done is to translate it by using integer calculation.
555 * I also refer to the function of fb_get_mode in the file of
556 * drivers/video/fbmon.c
557 *
558 * Standard GTF parameters::
559 *
560 * M = 600
561 * C = 40
562 * K = 128
563 * J = 20
564 *
565 * Returns:
566 * The modeline based on the GTF algorithm stored in a drm_display_mode object.
567 * The display mode object is allocated with drm_mode_create(). Returns NULL
568 * when no mode could be allocated.
569 */
570struct drm_display_mode *
571drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
572 bool interlaced, int margins)
573{
574 return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
575 interlaced, margins,
576 600, 40 * 2, 128, 20 * 2);
577}
578EXPORT_SYMBOL(drm_gtf_mode);
579
580#ifdef CONFIG_VIDEOMODE_HELPERS
581/**
582 * drm_display_mode_from_videomode - fill in @dmode using @vm,
583 * @vm: videomode structure to use as source
584 * @dmode: drm_display_mode structure to use as destination
585 *
586 * Fills out @dmode using the display mode specified in @vm.
587 */
588void drm_display_mode_from_videomode(const struct videomode *vm,
589 struct drm_display_mode *dmode)
590{
591 dmode->hdisplay = vm->hactive;
592 dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
593 dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
594 dmode->htotal = dmode->hsync_end + vm->hback_porch;
595
596 dmode->vdisplay = vm->vactive;
597 dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
598 dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
599 dmode->vtotal = dmode->vsync_end + vm->vback_porch;
600
601 dmode->clock = vm->pixelclock / 1000;
602
603 dmode->flags = 0;
604 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
605 dmode->flags |= DRM_MODE_FLAG_PHSYNC;
606 else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
607 dmode->flags |= DRM_MODE_FLAG_NHSYNC;
608 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
609 dmode->flags |= DRM_MODE_FLAG_PVSYNC;
610 else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
611 dmode->flags |= DRM_MODE_FLAG_NVSYNC;
612 if (vm->flags & DISPLAY_FLAGS_INTERLACED)
613 dmode->flags |= DRM_MODE_FLAG_INTERLACE;
614 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
615 dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
616 if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
617 dmode->flags |= DRM_MODE_FLAG_DBLCLK;
618 drm_mode_set_name(dmode);
619}
620EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
621
622/**
623 * drm_display_mode_to_videomode - fill in @vm using @dmode,
624 * @dmode: drm_display_mode structure to use as source
625 * @vm: videomode structure to use as destination
626 *
627 * Fills out @vm using the display mode specified in @dmode.
628 */
629void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
630 struct videomode *vm)
631{
632 vm->hactive = dmode->hdisplay;
633 vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
634 vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
635 vm->hback_porch = dmode->htotal - dmode->hsync_end;
636
637 vm->vactive = dmode->vdisplay;
638 vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
639 vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
640 vm->vback_porch = dmode->vtotal - dmode->vsync_end;
641
642 vm->pixelclock = dmode->clock * 1000;
643
644 vm->flags = 0;
645 if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
646 vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
647 else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
648 vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
649 if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
650 vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
651 else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
652 vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
653 if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
654 vm->flags |= DISPLAY_FLAGS_INTERLACED;
655 if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
656 vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
657 if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
658 vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
659}
660EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
661
662/**
663 * drm_bus_flags_from_videomode - extract information about pixelclk and
664 * DE polarity from videomode and store it in a separate variable
665 * @vm: videomode structure to use
666 * @bus_flags: information about pixelclk, sync and DE polarity will be stored
667 * here
668 *
669 * Sets DRM_BUS_FLAG_DE_(LOW|HIGH), DRM_BUS_FLAG_PIXDATA_DRIVE_(POS|NEG)EDGE
670 * and DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
671 * found in @vm
672 */
673void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
674{
675 *bus_flags = 0;
676 if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
677 *bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
678 if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
679 *bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
680
681 if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
682 *bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE;
683 if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
684 *bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE;
685
686 if (vm->flags & DISPLAY_FLAGS_DE_LOW)
687 *bus_flags |= DRM_BUS_FLAG_DE_LOW;
688 if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
689 *bus_flags |= DRM_BUS_FLAG_DE_HIGH;
690}
691EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
692
693#ifdef CONFIG_OF
694/**
695 * of_get_drm_display_mode - get a drm_display_mode from devicetree
696 * @np: device_node with the timing specification
697 * @dmode: will be set to the return value
698 * @bus_flags: information about pixelclk, sync and DE polarity
699 * @index: index into the list of display timings in devicetree
700 *
701 * This function is expensive and should only be used, if only one mode is to be
702 * read from DT. To get multiple modes start with of_get_display_timings and
703 * work with that instead.
704 *
705 * Returns:
706 * 0 on success, a negative errno code when no of videomode node was found.
707 */
708int of_get_drm_display_mode(struct device_node *np,
709 struct drm_display_mode *dmode, u32 *bus_flags,
710 int index)
711{
712 struct videomode vm;
713 int ret;
714
715 ret = of_get_videomode(np, &vm, index);
716 if (ret)
717 return ret;
718
719 drm_display_mode_from_videomode(&vm, dmode);
720 if (bus_flags)
721 drm_bus_flags_from_videomode(&vm, bus_flags);
722
723 pr_debug("%pOF: got %dx%d display mode\n",
724 np, vm.hactive, vm.vactive);
725 drm_mode_debug_printmodeline(dmode);
726
727 return 0;
728}
729EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
730#endif /* CONFIG_OF */
731#endif /* CONFIG_VIDEOMODE_HELPERS */
732
733/**
734 * drm_mode_set_name - set the name on a mode
735 * @mode: name will be set in this mode
736 *
737 * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
738 * with an optional 'i' suffix for interlaced modes.
739 */
740void drm_mode_set_name(struct drm_display_mode *mode)
741{
742 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
743
744 snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
745 mode->hdisplay, mode->vdisplay,
746 interlaced ? "i" : "");
747}
748EXPORT_SYMBOL(drm_mode_set_name);
749
750/**
751 * drm_mode_vrefresh - get the vrefresh of a mode
752 * @mode: mode
753 *
754 * Returns:
755 * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
756 * value first if it is not yet set.
757 */
758int drm_mode_vrefresh(const struct drm_display_mode *mode)
759{
760 unsigned int num, den;
761
762 if (mode->htotal == 0 || mode->vtotal == 0)
763 return 0;
764
765 num = mode->clock * 1000;
766 den = mode->htotal * mode->vtotal;
767
768 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
769 num *= 2;
770 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
771 den *= 2;
772 if (mode->vscan > 1)
773 den *= mode->vscan;
774
775 return DIV_ROUND_CLOSEST(num, den);
776}
777EXPORT_SYMBOL(drm_mode_vrefresh);
778
779/**
780 * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
781 * @mode: mode to query
782 * @hdisplay: hdisplay value to fill in
783 * @vdisplay: vdisplay value to fill in
784 *
785 * The vdisplay value will be doubled if the specified mode is a stereo mode of
786 * the appropriate layout.
787 */
788void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
789 int *hdisplay, int *vdisplay)
790{
791 struct drm_display_mode adjusted = *mode;
792
793 drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
794 *hdisplay = adjusted.crtc_hdisplay;
795 *vdisplay = adjusted.crtc_vdisplay;
796}
797EXPORT_SYMBOL(drm_mode_get_hv_timing);
798
799/**
800 * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
801 * @p: mode
802 * @adjust_flags: a combination of adjustment flags
803 *
804 * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
805 *
806 * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
807 * interlaced modes.
808 * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
809 * buffers containing two eyes (only adjust the timings when needed, eg. for
810 * "frame packing" or "side by side full").
811 * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
812 * be performed for doublescan and vscan > 1 modes respectively.
813 */
814void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
815{
816 if (!p)
817 return;
818
819 p->crtc_clock = p->clock;
820 p->crtc_hdisplay = p->hdisplay;
821 p->crtc_hsync_start = p->hsync_start;
822 p->crtc_hsync_end = p->hsync_end;
823 p->crtc_htotal = p->htotal;
824 p->crtc_hskew = p->hskew;
825 p->crtc_vdisplay = p->vdisplay;
826 p->crtc_vsync_start = p->vsync_start;
827 p->crtc_vsync_end = p->vsync_end;
828 p->crtc_vtotal = p->vtotal;
829
830 if (p->flags & DRM_MODE_FLAG_INTERLACE) {
831 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
832 p->crtc_vdisplay /= 2;
833 p->crtc_vsync_start /= 2;
834 p->crtc_vsync_end /= 2;
835 p->crtc_vtotal /= 2;
836 }
837 }
838
839 if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
840 if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
841 p->crtc_vdisplay *= 2;
842 p->crtc_vsync_start *= 2;
843 p->crtc_vsync_end *= 2;
844 p->crtc_vtotal *= 2;
845 }
846 }
847
848 if (!(adjust_flags & CRTC_NO_VSCAN)) {
849 if (p->vscan > 1) {
850 p->crtc_vdisplay *= p->vscan;
851 p->crtc_vsync_start *= p->vscan;
852 p->crtc_vsync_end *= p->vscan;
853 p->crtc_vtotal *= p->vscan;
854 }
855 }
856
857 if (adjust_flags & CRTC_STEREO_DOUBLE) {
858 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
859
860 switch (layout) {
861 case DRM_MODE_FLAG_3D_FRAME_PACKING:
862 p->crtc_clock *= 2;
863 p->crtc_vdisplay += p->crtc_vtotal;
864 p->crtc_vsync_start += p->crtc_vtotal;
865 p->crtc_vsync_end += p->crtc_vtotal;
866 p->crtc_vtotal += p->crtc_vtotal;
867 break;
868 }
869 }
870
871 p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
872 p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
873 p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
874 p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
875}
876EXPORT_SYMBOL(drm_mode_set_crtcinfo);
877
878/**
879 * drm_mode_copy - copy the mode
880 * @dst: mode to overwrite
881 * @src: mode to copy
882 *
883 * Copy an existing mode into another mode, preserving the object id and
884 * list head of the destination mode.
885 */
886void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
887{
888 struct list_head head = dst->head;
889
890 *dst = *src;
891 dst->head = head;
892}
893EXPORT_SYMBOL(drm_mode_copy);
894
895/**
896 * drm_mode_duplicate - allocate and duplicate an existing mode
897 * @dev: drm_device to allocate the duplicated mode for
898 * @mode: mode to duplicate
899 *
900 * Just allocate a new mode, copy the existing mode into it, and return
901 * a pointer to it. Used to create new instances of established modes.
902 *
903 * Returns:
904 * Pointer to duplicated mode on success, NULL on error.
905 */
906struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
907 const struct drm_display_mode *mode)
908{
909 struct drm_display_mode *nmode;
910
911 nmode = drm_mode_create(dev);
912 if (!nmode)
913 return NULL;
914
915 drm_mode_copy(nmode, mode);
916
917 return nmode;
918}
919EXPORT_SYMBOL(drm_mode_duplicate);
920
921static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
922 const struct drm_display_mode *mode2)
923{
924 return mode1->hdisplay == mode2->hdisplay &&
925 mode1->hsync_start == mode2->hsync_start &&
926 mode1->hsync_end == mode2->hsync_end &&
927 mode1->htotal == mode2->htotal &&
928 mode1->hskew == mode2->hskew &&
929 mode1->vdisplay == mode2->vdisplay &&
930 mode1->vsync_start == mode2->vsync_start &&
931 mode1->vsync_end == mode2->vsync_end &&
932 mode1->vtotal == mode2->vtotal &&
933 mode1->vscan == mode2->vscan;
934}
935
936static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
937 const struct drm_display_mode *mode2)
938{
939 /*
940 * do clock check convert to PICOS
941 * so fb modes get matched the same
942 */
943 if (mode1->clock && mode2->clock)
944 return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
945 else
946 return mode1->clock == mode2->clock;
947}
948
949static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
950 const struct drm_display_mode *mode2)
951{
952 return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
953 (mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
954}
955
956static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
957 const struct drm_display_mode *mode2)
958{
959 return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
960 (mode2->flags & DRM_MODE_FLAG_3D_MASK);
961}
962
963static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
964 const struct drm_display_mode *mode2)
965{
966 return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
967}
968
969/**
970 * drm_mode_match - test modes for (partial) equality
971 * @mode1: first mode
972 * @mode2: second mode
973 * @match_flags: which parts need to match (DRM_MODE_MATCH_*)
974 *
975 * Check to see if @mode1 and @mode2 are equivalent.
976 *
977 * Returns:
978 * True if the modes are (partially) equal, false otherwise.
979 */
980bool drm_mode_match(const struct drm_display_mode *mode1,
981 const struct drm_display_mode *mode2,
982 unsigned int match_flags)
983{
984 if (!mode1 && !mode2)
985 return true;
986
987 if (!mode1 || !mode2)
988 return false;
989
990 if (match_flags & DRM_MODE_MATCH_TIMINGS &&
991 !drm_mode_match_timings(mode1, mode2))
992 return false;
993
994 if (match_flags & DRM_MODE_MATCH_CLOCK &&
995 !drm_mode_match_clock(mode1, mode2))
996 return false;
997
998 if (match_flags & DRM_MODE_MATCH_FLAGS &&
999 !drm_mode_match_flags(mode1, mode2))
1000 return false;
1001
1002 if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
1003 !drm_mode_match_3d_flags(mode1, mode2))
1004 return false;
1005
1006 if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
1007 !drm_mode_match_aspect_ratio(mode1, mode2))
1008 return false;
1009
1010 return true;
1011}
1012EXPORT_SYMBOL(drm_mode_match);
1013
1014/**
1015 * drm_mode_equal - test modes for equality
1016 * @mode1: first mode
1017 * @mode2: second mode
1018 *
1019 * Check to see if @mode1 and @mode2 are equivalent.
1020 *
1021 * Returns:
1022 * True if the modes are equal, false otherwise.
1023 */
1024bool drm_mode_equal(const struct drm_display_mode *mode1,
1025 const struct drm_display_mode *mode2)
1026{
1027 return drm_mode_match(mode1, mode2,
1028 DRM_MODE_MATCH_TIMINGS |
1029 DRM_MODE_MATCH_CLOCK |
1030 DRM_MODE_MATCH_FLAGS |
1031 DRM_MODE_MATCH_3D_FLAGS|
1032 DRM_MODE_MATCH_ASPECT_RATIO);
1033}
1034EXPORT_SYMBOL(drm_mode_equal);
1035
1036/**
1037 * drm_mode_equal_no_clocks - test modes for equality
1038 * @mode1: first mode
1039 * @mode2: second mode
1040 *
1041 * Check to see if @mode1 and @mode2 are equivalent, but
1042 * don't check the pixel clocks.
1043 *
1044 * Returns:
1045 * True if the modes are equal, false otherwise.
1046 */
1047bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
1048 const struct drm_display_mode *mode2)
1049{
1050 return drm_mode_match(mode1, mode2,
1051 DRM_MODE_MATCH_TIMINGS |
1052 DRM_MODE_MATCH_FLAGS |
1053 DRM_MODE_MATCH_3D_FLAGS);
1054}
1055EXPORT_SYMBOL(drm_mode_equal_no_clocks);
1056
1057/**
1058 * drm_mode_equal_no_clocks_no_stereo - test modes for equality
1059 * @mode1: first mode
1060 * @mode2: second mode
1061 *
1062 * Check to see if @mode1 and @mode2 are equivalent, but
1063 * don't check the pixel clocks nor the stereo layout.
1064 *
1065 * Returns:
1066 * True if the modes are equal, false otherwise.
1067 */
1068bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
1069 const struct drm_display_mode *mode2)
1070{
1071 return drm_mode_match(mode1, mode2,
1072 DRM_MODE_MATCH_TIMINGS |
1073 DRM_MODE_MATCH_FLAGS);
1074}
1075EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
1076
1077static enum drm_mode_status
1078drm_mode_validate_basic(const struct drm_display_mode *mode)
1079{
1080 if (mode->type & ~DRM_MODE_TYPE_ALL)
1081 return MODE_BAD;
1082
1083 if (mode->flags & ~DRM_MODE_FLAG_ALL)
1084 return MODE_BAD;
1085
1086 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1087 return MODE_BAD;
1088
1089 if (mode->clock == 0)
1090 return MODE_CLOCK_LOW;
1091
1092 if (mode->hdisplay == 0 ||
1093 mode->hsync_start < mode->hdisplay ||
1094 mode->hsync_end < mode->hsync_start ||
1095 mode->htotal < mode->hsync_end)
1096 return MODE_H_ILLEGAL;
1097
1098 if (mode->vdisplay == 0 ||
1099 mode->vsync_start < mode->vdisplay ||
1100 mode->vsync_end < mode->vsync_start ||
1101 mode->vtotal < mode->vsync_end)
1102 return MODE_V_ILLEGAL;
1103
1104 return MODE_OK;
1105}
1106
1107/**
1108 * drm_mode_validate_driver - make sure the mode is somewhat sane
1109 * @dev: drm device
1110 * @mode: mode to check
1111 *
1112 * First do basic validation on the mode, and then allow the driver
1113 * to check for device/driver specific limitations via the optional
1114 * &drm_mode_config_helper_funcs.mode_valid hook.
1115 *
1116 * Returns:
1117 * The mode status
1118 */
1119enum drm_mode_status
1120drm_mode_validate_driver(struct drm_device *dev,
1121 const struct drm_display_mode *mode)
1122{
1123 enum drm_mode_status status;
1124
1125 status = drm_mode_validate_basic(mode);
1126 if (status != MODE_OK)
1127 return status;
1128
1129 if (dev->mode_config.funcs->mode_valid)
1130 return dev->mode_config.funcs->mode_valid(dev, mode);
1131 else
1132 return MODE_OK;
1133}
1134EXPORT_SYMBOL(drm_mode_validate_driver);
1135
1136/**
1137 * drm_mode_validate_size - make sure modes adhere to size constraints
1138 * @mode: mode to check
1139 * @maxX: maximum width
1140 * @maxY: maximum height
1141 *
1142 * This function is a helper which can be used to validate modes against size
1143 * limitations of the DRM device/connector. If a mode is too big its status
1144 * member is updated with the appropriate validation failure code. The list
1145 * itself is not changed.
1146 *
1147 * Returns:
1148 * The mode status
1149 */
1150enum drm_mode_status
1151drm_mode_validate_size(const struct drm_display_mode *mode,
1152 int maxX, int maxY)
1153{
1154 if (maxX > 0 && mode->hdisplay > maxX)
1155 return MODE_VIRTUAL_X;
1156
1157 if (maxY > 0 && mode->vdisplay > maxY)
1158 return MODE_VIRTUAL_Y;
1159
1160 return MODE_OK;
1161}
1162EXPORT_SYMBOL(drm_mode_validate_size);
1163
1164/**
1165 * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
1166 * @mode: mode to check
1167 * @connector: drm connector under action
1168 *
1169 * This function is a helper which can be used to filter out any YCBCR420
1170 * only mode, when the source doesn't support it.
1171 *
1172 * Returns:
1173 * The mode status
1174 */
1175enum drm_mode_status
1176drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
1177 struct drm_connector *connector)
1178{
1179 u8 vic = drm_match_cea_mode(mode);
1180 enum drm_mode_status status = MODE_OK;
1181 struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
1182
1183 if (test_bit(vic, hdmi->y420_vdb_modes)) {
1184 if (!connector->ycbcr_420_allowed)
1185 status = MODE_NO_420;
1186 }
1187
1188 return status;
1189}
1190EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
1191
1192#define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1193
1194static const char * const drm_mode_status_names[] = {
1195 MODE_STATUS(OK),
1196 MODE_STATUS(HSYNC),
1197 MODE_STATUS(VSYNC),
1198 MODE_STATUS(H_ILLEGAL),
1199 MODE_STATUS(V_ILLEGAL),
1200 MODE_STATUS(BAD_WIDTH),
1201 MODE_STATUS(NOMODE),
1202 MODE_STATUS(NO_INTERLACE),
1203 MODE_STATUS(NO_DBLESCAN),
1204 MODE_STATUS(NO_VSCAN),
1205 MODE_STATUS(MEM),
1206 MODE_STATUS(VIRTUAL_X),
1207 MODE_STATUS(VIRTUAL_Y),
1208 MODE_STATUS(MEM_VIRT),
1209 MODE_STATUS(NOCLOCK),
1210 MODE_STATUS(CLOCK_HIGH),
1211 MODE_STATUS(CLOCK_LOW),
1212 MODE_STATUS(CLOCK_RANGE),
1213 MODE_STATUS(BAD_HVALUE),
1214 MODE_STATUS(BAD_VVALUE),
1215 MODE_STATUS(BAD_VSCAN),
1216 MODE_STATUS(HSYNC_NARROW),
1217 MODE_STATUS(HSYNC_WIDE),
1218 MODE_STATUS(HBLANK_NARROW),
1219 MODE_STATUS(HBLANK_WIDE),
1220 MODE_STATUS(VSYNC_NARROW),
1221 MODE_STATUS(VSYNC_WIDE),
1222 MODE_STATUS(VBLANK_NARROW),
1223 MODE_STATUS(VBLANK_WIDE),
1224 MODE_STATUS(PANEL),
1225 MODE_STATUS(INTERLACE_WIDTH),
1226 MODE_STATUS(ONE_WIDTH),
1227 MODE_STATUS(ONE_HEIGHT),
1228 MODE_STATUS(ONE_SIZE),
1229 MODE_STATUS(NO_REDUCED),
1230 MODE_STATUS(NO_STEREO),
1231 MODE_STATUS(NO_420),
1232 MODE_STATUS(STALE),
1233 MODE_STATUS(BAD),
1234 MODE_STATUS(ERROR),
1235};
1236
1237#undef MODE_STATUS
1238
1239const char *drm_get_mode_status_name(enum drm_mode_status status)
1240{
1241 int index = status + 3;
1242
1243 if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1244 return "";
1245
1246 return drm_mode_status_names[index];
1247}
1248
1249/**
1250 * drm_mode_prune_invalid - remove invalid modes from mode list
1251 * @dev: DRM device
1252 * @mode_list: list of modes to check
1253 * @verbose: be verbose about it
1254 *
1255 * This helper function can be used to prune a display mode list after
1256 * validation has been completed. All modes whose status is not MODE_OK will be
1257 * removed from the list, and if @verbose the status code and mode name is also
1258 * printed to dmesg.
1259 */
1260void drm_mode_prune_invalid(struct drm_device *dev,
1261 struct list_head *mode_list, bool verbose)
1262{
1263 struct drm_display_mode *mode, *t;
1264
1265 list_for_each_entry_safe(mode, t, mode_list, head) {
1266 if (mode->status != MODE_OK) {
1267 list_del(&mode->head);
1268 if (verbose) {
1269 drm_mode_debug_printmodeline(mode);
1270 DRM_DEBUG_KMS("Not using %s mode: %s\n",
1271 mode->name,
1272 drm_get_mode_status_name(mode->status));
1273 }
1274 drm_mode_destroy(dev, mode);
1275 }
1276 }
1277}
1278EXPORT_SYMBOL(drm_mode_prune_invalid);
1279
1280/**
1281 * drm_mode_compare - compare modes for favorability
1282 * @priv: unused
1283 * @lh_a: list_head for first mode
1284 * @lh_b: list_head for second mode
1285 *
1286 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1287 * which is better.
1288 *
1289 * Returns:
1290 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1291 * positive if @lh_b is better than @lh_a.
1292 */
1293static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
1294{
1295 struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1296 struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1297 int diff;
1298
1299 diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1300 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1301 if (diff)
1302 return diff;
1303 diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1304 if (diff)
1305 return diff;
1306
1307 diff = drm_mode_vrefresh(b) - drm_mode_vrefresh(a);
1308 if (diff)
1309 return diff;
1310
1311 diff = b->clock - a->clock;
1312 return diff;
1313}
1314
1315/**
1316 * drm_mode_sort - sort mode list
1317 * @mode_list: list of drm_display_mode structures to sort
1318 *
1319 * Sort @mode_list by favorability, moving good modes to the head of the list.
1320 */
1321void drm_mode_sort(struct list_head *mode_list)
1322{
1323 list_sort(NULL, mode_list, drm_mode_compare);
1324}
1325EXPORT_SYMBOL(drm_mode_sort);
1326
1327/**
1328 * drm_connector_list_update - update the mode list for the connector
1329 * @connector: the connector to update
1330 *
1331 * This moves the modes from the @connector probed_modes list
1332 * to the actual mode list. It compares the probed mode against the current
1333 * list and only adds different/new modes.
1334 *
1335 * This is just a helper functions doesn't validate any modes itself and also
1336 * doesn't prune any invalid modes. Callers need to do that themselves.
1337 */
1338void drm_connector_list_update(struct drm_connector *connector)
1339{
1340 struct drm_display_mode *pmode, *pt;
1341
1342 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1343
1344 list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1345 struct drm_display_mode *mode;
1346 bool found_it = false;
1347
1348 /* go through current modes checking for the new probed mode */
1349 list_for_each_entry(mode, &connector->modes, head) {
1350 if (!drm_mode_equal(pmode, mode))
1351 continue;
1352
1353 found_it = true;
1354
1355 /*
1356 * If the old matching mode is stale (ie. left over
1357 * from a previous probe) just replace it outright.
1358 * Otherwise just merge the type bits between all
1359 * equal probed modes.
1360 *
1361 * If two probed modes are considered equal, pick the
1362 * actual timings from the one that's marked as
1363 * preferred (in case the match isn't 100%). If
1364 * multiple or zero preferred modes are present, favor
1365 * the mode added to the probed_modes list first.
1366 */
1367 if (mode->status == MODE_STALE) {
1368 drm_mode_copy(mode, pmode);
1369 } else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1370 (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1371 pmode->type |= mode->type;
1372 drm_mode_copy(mode, pmode);
1373 } else {
1374 mode->type |= pmode->type;
1375 }
1376
1377 list_del(&pmode->head);
1378 drm_mode_destroy(connector->dev, pmode);
1379 break;
1380 }
1381
1382 if (!found_it) {
1383 list_move_tail(&pmode->head, &connector->modes);
1384 }
1385 }
1386}
1387EXPORT_SYMBOL(drm_connector_list_update);
1388
1389static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
1390 struct drm_cmdline_mode *mode)
1391{
1392 unsigned int bpp;
1393
1394 if (str[0] != '-')
1395 return -EINVAL;
1396
1397 str++;
1398 bpp = simple_strtol(str, end_ptr, 10);
1399 if (*end_ptr == str)
1400 return -EINVAL;
1401
1402 mode->bpp = bpp;
1403 mode->bpp_specified = true;
1404
1405 return 0;
1406}
1407
1408static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
1409 struct drm_cmdline_mode *mode)
1410{
1411 unsigned int refresh;
1412
1413 if (str[0] != '@')
1414 return -EINVAL;
1415
1416 str++;
1417 refresh = simple_strtol(str, end_ptr, 10);
1418 if (*end_ptr == str)
1419 return -EINVAL;
1420
1421 mode->refresh = refresh;
1422 mode->refresh_specified = true;
1423
1424 return 0;
1425}
1426
1427static int drm_mode_parse_cmdline_extra(const char *str, int length,
1428 bool freestanding,
1429 const struct drm_connector *connector,
1430 struct drm_cmdline_mode *mode)
1431{
1432 int i;
1433
1434 for (i = 0; i < length; i++) {
1435 switch (str[i]) {
1436 case 'i':
1437 if (freestanding)
1438 return -EINVAL;
1439
1440 mode->interlace = true;
1441 break;
1442 case 'm':
1443 if (freestanding)
1444 return -EINVAL;
1445
1446 mode->margins = true;
1447 break;
1448 case 'D':
1449 if (mode->force != DRM_FORCE_UNSPECIFIED)
1450 return -EINVAL;
1451
1452 if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1453 (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1454 mode->force = DRM_FORCE_ON;
1455 else
1456 mode->force = DRM_FORCE_ON_DIGITAL;
1457 break;
1458 case 'd':
1459 if (mode->force != DRM_FORCE_UNSPECIFIED)
1460 return -EINVAL;
1461
1462 mode->force = DRM_FORCE_OFF;
1463 break;
1464 case 'e':
1465 if (mode->force != DRM_FORCE_UNSPECIFIED)
1466 return -EINVAL;
1467
1468 mode->force = DRM_FORCE_ON;
1469 break;
1470 default:
1471 return -EINVAL;
1472 }
1473 }
1474
1475 return 0;
1476}
1477
1478static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
1479 bool extras,
1480 const struct drm_connector *connector,
1481 struct drm_cmdline_mode *mode)
1482{
1483 const char *str_start = str;
1484 bool rb = false, cvt = false;
1485 int xres = 0, yres = 0;
1486 int remaining, i;
1487 char *end_ptr;
1488
1489 xres = simple_strtol(str, &end_ptr, 10);
1490 if (end_ptr == str)
1491 return -EINVAL;
1492
1493 if (end_ptr[0] != 'x')
1494 return -EINVAL;
1495 end_ptr++;
1496
1497 str = end_ptr;
1498 yres = simple_strtol(str, &end_ptr, 10);
1499 if (end_ptr == str)
1500 return -EINVAL;
1501
1502 remaining = length - (end_ptr - str_start);
1503 if (remaining < 0)
1504 return -EINVAL;
1505
1506 for (i = 0; i < remaining; i++) {
1507 switch (end_ptr[i]) {
1508 case 'M':
1509 cvt = true;
1510 break;
1511 case 'R':
1512 rb = true;
1513 break;
1514 default:
1515 /*
1516 * Try to pass that to our extras parsing
1517 * function to handle the case where the
1518 * extras are directly after the resolution
1519 */
1520 if (extras) {
1521 int ret = drm_mode_parse_cmdline_extra(end_ptr + i,
1522 1,
1523 false,
1524 connector,
1525 mode);
1526 if (ret)
1527 return ret;
1528 } else {
1529 return -EINVAL;
1530 }
1531 }
1532 }
1533
1534 mode->xres = xres;
1535 mode->yres = yres;
1536 mode->cvt = cvt;
1537 mode->rb = rb;
1538
1539 return 0;
1540}
1541
1542static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret)
1543{
1544 const char *value;
1545 char *endp;
1546
1547 /*
1548 * delim must point to the '=', otherwise it is a syntax error and
1549 * if delim points to the terminating zero, then delim + 1 wil point
1550 * past the end of the string.
1551 */
1552 if (*delim != '=')
1553 return -EINVAL;
1554
1555 value = delim + 1;
1556 *int_ret = simple_strtol(value, &endp, 10);
1557
1558 /* Make sure we have parsed something */
1559 if (endp == value)
1560 return -EINVAL;
1561
1562 return 0;
1563}
1564
1565static int drm_mode_parse_panel_orientation(const char *delim,
1566 struct drm_cmdline_mode *mode)
1567{
1568 const char *value;
1569
1570 if (*delim != '=')
1571 return -EINVAL;
1572
1573 value = delim + 1;
1574 delim = strchr(value, ',');
1575 if (!delim)
1576 delim = value + strlen(value);
1577
1578 if (!strncmp(value, "normal", delim - value))
1579 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
1580 else if (!strncmp(value, "upside_down", delim - value))
1581 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
1582 else if (!strncmp(value, "left_side_up", delim - value))
1583 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
1584 else if (!strncmp(value, "right_side_up", delim - value))
1585 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
1586 else
1587 return -EINVAL;
1588
1589 return 0;
1590}
1591
1592static int drm_mode_parse_cmdline_options(const char *str,
1593 bool freestanding,
1594 const struct drm_connector *connector,
1595 struct drm_cmdline_mode *mode)
1596{
1597 unsigned int deg, margin, rotation = 0;
1598 const char *delim, *option, *sep;
1599
1600 option = str;
1601 do {
1602 delim = strchr(option, '=');
1603 if (!delim) {
1604 delim = strchr(option, ',');
1605
1606 if (!delim)
1607 delim = option + strlen(option);
1608 }
1609
1610 if (!strncmp(option, "rotate", delim - option)) {
1611 if (drm_mode_parse_cmdline_int(delim, °))
1612 return -EINVAL;
1613
1614 switch (deg) {
1615 case 0:
1616 rotation |= DRM_MODE_ROTATE_0;
1617 break;
1618
1619 case 90:
1620 rotation |= DRM_MODE_ROTATE_90;
1621 break;
1622
1623 case 180:
1624 rotation |= DRM_MODE_ROTATE_180;
1625 break;
1626
1627 case 270:
1628 rotation |= DRM_MODE_ROTATE_270;
1629 break;
1630
1631 default:
1632 return -EINVAL;
1633 }
1634 } else if (!strncmp(option, "reflect_x", delim - option)) {
1635 rotation |= DRM_MODE_REFLECT_X;
1636 } else if (!strncmp(option, "reflect_y", delim - option)) {
1637 rotation |= DRM_MODE_REFLECT_Y;
1638 } else if (!strncmp(option, "margin_right", delim - option)) {
1639 if (drm_mode_parse_cmdline_int(delim, &margin))
1640 return -EINVAL;
1641
1642 mode->tv_margins.right = margin;
1643 } else if (!strncmp(option, "margin_left", delim - option)) {
1644 if (drm_mode_parse_cmdline_int(delim, &margin))
1645 return -EINVAL;
1646
1647 mode->tv_margins.left = margin;
1648 } else if (!strncmp(option, "margin_top", delim - option)) {
1649 if (drm_mode_parse_cmdline_int(delim, &margin))
1650 return -EINVAL;
1651
1652 mode->tv_margins.top = margin;
1653 } else if (!strncmp(option, "margin_bottom", delim - option)) {
1654 if (drm_mode_parse_cmdline_int(delim, &margin))
1655 return -EINVAL;
1656
1657 mode->tv_margins.bottom = margin;
1658 } else if (!strncmp(option, "panel_orientation", delim - option)) {
1659 if (drm_mode_parse_panel_orientation(delim, mode))
1660 return -EINVAL;
1661 } else {
1662 return -EINVAL;
1663 }
1664 sep = strchr(delim, ',');
1665 option = sep + 1;
1666 } while (sep);
1667
1668 if (rotation && freestanding)
1669 return -EINVAL;
1670
1671 if (!(rotation & DRM_MODE_ROTATE_MASK))
1672 rotation |= DRM_MODE_ROTATE_0;
1673
1674 /* Make sure there is exactly one rotation defined */
1675 if (!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK))
1676 return -EINVAL;
1677
1678 mode->rotation_reflection = rotation;
1679
1680 return 0;
1681}
1682
1683static const char * const drm_named_modes_whitelist[] = {
1684 "NTSC",
1685 "PAL",
1686};
1687
1688/**
1689 * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
1690 * @mode_option: optional per connector mode option
1691 * @connector: connector to parse modeline for
1692 * @mode: preallocated drm_cmdline_mode structure to fill out
1693 *
1694 * This parses @mode_option command line modeline for modes and options to
1695 * configure the connector. If @mode_option is NULL the default command line
1696 * modeline in fb_mode_option will be parsed instead.
1697 *
1698 * This uses the same parameters as the fb modedb.c, except for an extra
1699 * force-enable, force-enable-digital and force-disable bit at the end::
1700 *
1701 * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1702 *
1703 * Additionals options can be provided following the mode, using a comma to
1704 * separate each option. Valid options can be found in
1705 * Documentation/fb/modedb.rst.
1706 *
1707 * The intermediate drm_cmdline_mode structure is required to store additional
1708 * options from the command line modline like the force-enable/disable flag.
1709 *
1710 * Returns:
1711 * True if a valid modeline has been parsed, false otherwise.
1712 */
1713bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1714 const struct drm_connector *connector,
1715 struct drm_cmdline_mode *mode)
1716{
1717 const char *name;
1718 bool freestanding = false, parse_extras = false;
1719 unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
1720 unsigned int mode_end = 0;
1721 const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
1722 const char *options_ptr = NULL;
1723 char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
1724 int i, len, ret;
1725
1726 memset(mode, 0, sizeof(*mode));
1727 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
1728
1729 if (!mode_option)
1730 return false;
1731
1732 name = mode_option;
1733
1734 /* Try to locate the bpp and refresh specifiers, if any */
1735 bpp_ptr = strchr(name, '-');
1736 if (bpp_ptr)
1737 bpp_off = bpp_ptr - name;
1738
1739 refresh_ptr = strchr(name, '@');
1740 if (refresh_ptr)
1741 refresh_off = refresh_ptr - name;
1742
1743 /* Locate the start of named options */
1744 options_ptr = strchr(name, ',');
1745 if (options_ptr)
1746 options_off = options_ptr - name;
1747
1748 /* Locate the end of the name / resolution, and parse it */
1749 if (bpp_ptr) {
1750 mode_end = bpp_off;
1751 } else if (refresh_ptr) {
1752 mode_end = refresh_off;
1753 } else if (options_ptr) {
1754 mode_end = options_off;
1755 parse_extras = true;
1756 } else {
1757 mode_end = strlen(name);
1758 parse_extras = true;
1759 }
1760
1761 /* First check for a named mode */
1762 for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++) {
1763 ret = str_has_prefix(name, drm_named_modes_whitelist[i]);
1764 if (ret == mode_end) {
1765 if (refresh_ptr)
1766 return false; /* named + refresh is invalid */
1767
1768 strcpy(mode->name, drm_named_modes_whitelist[i]);
1769 mode->specified = true;
1770 break;
1771 }
1772 }
1773
1774 /* No named mode? Check for a normal mode argument, e.g. 1024x768 */
1775 if (!mode->specified && isdigit(name[0])) {
1776 ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
1777 parse_extras,
1778 connector,
1779 mode);
1780 if (ret)
1781 return false;
1782
1783 mode->specified = true;
1784 }
1785
1786 /* No mode? Check for freestanding extras and/or options */
1787 if (!mode->specified) {
1788 unsigned int len = strlen(mode_option);
1789
1790 if (bpp_ptr || refresh_ptr)
1791 return false; /* syntax error */
1792
1793 if (len == 1 || (len >= 2 && mode_option[1] == ','))
1794 extra_ptr = mode_option;
1795 else
1796 options_ptr = mode_option - 1;
1797
1798 freestanding = true;
1799 }
1800
1801 if (bpp_ptr) {
1802 ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode);
1803 if (ret)
1804 return false;
1805
1806 mode->bpp_specified = true;
1807 }
1808
1809 if (refresh_ptr) {
1810 ret = drm_mode_parse_cmdline_refresh(refresh_ptr,
1811 &refresh_end_ptr, mode);
1812 if (ret)
1813 return false;
1814
1815 mode->refresh_specified = true;
1816 }
1817
1818 /*
1819 * Locate the end of the bpp / refresh, and parse the extras
1820 * if relevant
1821 */
1822 if (bpp_ptr && refresh_ptr)
1823 extra_ptr = max(bpp_end_ptr, refresh_end_ptr);
1824 else if (bpp_ptr)
1825 extra_ptr = bpp_end_ptr;
1826 else if (refresh_ptr)
1827 extra_ptr = refresh_end_ptr;
1828
1829 if (extra_ptr) {
1830 if (options_ptr)
1831 len = options_ptr - extra_ptr;
1832 else
1833 len = strlen(extra_ptr);
1834
1835 ret = drm_mode_parse_cmdline_extra(extra_ptr, len, freestanding,
1836 connector, mode);
1837 if (ret)
1838 return false;
1839 }
1840
1841 if (options_ptr) {
1842 ret = drm_mode_parse_cmdline_options(options_ptr + 1,
1843 freestanding,
1844 connector, mode);
1845 if (ret)
1846 return false;
1847 }
1848
1849 return true;
1850}
1851EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1852
1853/**
1854 * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
1855 * @dev: DRM device to create the new mode for
1856 * @cmd: input command line modeline
1857 *
1858 * Returns:
1859 * Pointer to converted mode on success, NULL on error.
1860 */
1861struct drm_display_mode *
1862drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1863 struct drm_cmdline_mode *cmd)
1864{
1865 struct drm_display_mode *mode;
1866
1867 if (cmd->cvt)
1868 mode = drm_cvt_mode(dev,
1869 cmd->xres, cmd->yres,
1870 cmd->refresh_specified ? cmd->refresh : 60,
1871 cmd->rb, cmd->interlace,
1872 cmd->margins);
1873 else
1874 mode = drm_gtf_mode(dev,
1875 cmd->xres, cmd->yres,
1876 cmd->refresh_specified ? cmd->refresh : 60,
1877 cmd->interlace,
1878 cmd->margins);
1879 if (!mode)
1880 return NULL;
1881
1882 mode->type |= DRM_MODE_TYPE_USERDEF;
1883 /* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
1884 if (cmd->xres == 1366)
1885 drm_mode_fixup_1366x768(mode);
1886 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1887 return mode;
1888}
1889EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
1890
1891/**
1892 * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo
1893 * @out: drm_mode_modeinfo struct to return to the user
1894 * @in: drm_display_mode to use
1895 *
1896 * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
1897 * the user.
1898 */
1899void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
1900 const struct drm_display_mode *in)
1901{
1902 out->clock = in->clock;
1903 out->hdisplay = in->hdisplay;
1904 out->hsync_start = in->hsync_start;
1905 out->hsync_end = in->hsync_end;
1906 out->htotal = in->htotal;
1907 out->hskew = in->hskew;
1908 out->vdisplay = in->vdisplay;
1909 out->vsync_start = in->vsync_start;
1910 out->vsync_end = in->vsync_end;
1911 out->vtotal = in->vtotal;
1912 out->vscan = in->vscan;
1913 out->vrefresh = drm_mode_vrefresh(in);
1914 out->flags = in->flags;
1915 out->type = in->type;
1916
1917 switch (in->picture_aspect_ratio) {
1918 case HDMI_PICTURE_ASPECT_4_3:
1919 out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
1920 break;
1921 case HDMI_PICTURE_ASPECT_16_9:
1922 out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
1923 break;
1924 case HDMI_PICTURE_ASPECT_64_27:
1925 out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
1926 break;
1927 case HDMI_PICTURE_ASPECT_256_135:
1928 out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
1929 break;
1930 default:
1931 WARN(1, "Invalid aspect ratio (0%x) on mode\n",
1932 in->picture_aspect_ratio);
1933 fallthrough;
1934 case HDMI_PICTURE_ASPECT_NONE:
1935 out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
1936 break;
1937 }
1938
1939 strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1940 out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1941}
1942
1943/**
1944 * drm_crtc_convert_umode - convert a modeinfo into a drm_display_mode
1945 * @dev: drm device
1946 * @out: drm_display_mode to return to the user
1947 * @in: drm_mode_modeinfo to use
1948 *
1949 * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
1950 * the caller.
1951 *
1952 * Returns:
1953 * Zero on success, negative errno on failure.
1954 */
1955int drm_mode_convert_umode(struct drm_device *dev,
1956 struct drm_display_mode *out,
1957 const struct drm_mode_modeinfo *in)
1958{
1959 if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
1960 return -ERANGE;
1961
1962 out->clock = in->clock;
1963 out->hdisplay = in->hdisplay;
1964 out->hsync_start = in->hsync_start;
1965 out->hsync_end = in->hsync_end;
1966 out->htotal = in->htotal;
1967 out->hskew = in->hskew;
1968 out->vdisplay = in->vdisplay;
1969 out->vsync_start = in->vsync_start;
1970 out->vsync_end = in->vsync_end;
1971 out->vtotal = in->vtotal;
1972 out->vscan = in->vscan;
1973 out->flags = in->flags;
1974 /*
1975 * Old xf86-video-vmware (possibly others too) used to
1976 * leave 'type' unititialized. Just ignore any bits we
1977 * don't like. It's a just hint after all, and more
1978 * useful for the kernel->userspace direction anyway.
1979 */
1980 out->type = in->type & DRM_MODE_TYPE_ALL;
1981 strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1982 out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1983
1984 /* Clearing picture aspect ratio bits from out flags,
1985 * as the aspect-ratio information is not stored in
1986 * flags for kernel-mode, but in picture_aspect_ratio.
1987 */
1988 out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
1989
1990 switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
1991 case DRM_MODE_FLAG_PIC_AR_4_3:
1992 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
1993 break;
1994 case DRM_MODE_FLAG_PIC_AR_16_9:
1995 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
1996 break;
1997 case DRM_MODE_FLAG_PIC_AR_64_27:
1998 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27;
1999 break;
2000 case DRM_MODE_FLAG_PIC_AR_256_135:
2001 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_256_135;
2002 break;
2003 case DRM_MODE_FLAG_PIC_AR_NONE:
2004 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
2005 break;
2006 default:
2007 return -EINVAL;
2008 }
2009
2010 out->status = drm_mode_validate_driver(dev, out);
2011 if (out->status != MODE_OK)
2012 return -EINVAL;
2013
2014 drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
2015
2016 return 0;
2017}
2018
2019/**
2020 * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
2021 * output format
2022 *
2023 * @display: display under action
2024 * @mode: video mode to be tested.
2025 *
2026 * Returns:
2027 * true if the mode can be supported in YCBCR420 format
2028 * false if not.
2029 */
2030bool drm_mode_is_420_only(const struct drm_display_info *display,
2031 const struct drm_display_mode *mode)
2032{
2033 u8 vic = drm_match_cea_mode(mode);
2034
2035 return test_bit(vic, display->hdmi.y420_vdb_modes);
2036}
2037EXPORT_SYMBOL(drm_mode_is_420_only);
2038
2039/**
2040 * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
2041 * output format also (along with RGB/YCBCR444/422)
2042 *
2043 * @display: display under action.
2044 * @mode: video mode to be tested.
2045 *
2046 * Returns:
2047 * true if the mode can be support YCBCR420 format
2048 * false if not.
2049 */
2050bool drm_mode_is_420_also(const struct drm_display_info *display,
2051 const struct drm_display_mode *mode)
2052{
2053 u8 vic = drm_match_cea_mode(mode);
2054
2055 return test_bit(vic, display->hdmi.y420_cmdb_modes);
2056}
2057EXPORT_SYMBOL(drm_mode_is_420_also);
2058/**
2059 * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
2060 * output format
2061 *
2062 * @display: display under action.
2063 * @mode: video mode to be tested.
2064 *
2065 * Returns:
2066 * true if the mode can be supported in YCBCR420 format
2067 * false if not.
2068 */
2069bool drm_mode_is_420(const struct drm_display_info *display,
2070 const struct drm_display_mode *mode)
2071{
2072 return drm_mode_is_420_only(display, mode) ||
2073 drm_mode_is_420_also(display, mode);
2074}
2075EXPORT_SYMBOL(drm_mode_is_420);
1/*
2 * Copyright © 1997-2003 by The XFree86 Project, Inc.
3 * Copyright © 2007 Dave Airlie
4 * Copyright © 2007-2008 Intel Corporation
5 * Jesse Barnes <jesse.barnes@intel.com>
6 * Copyright 2005-2006 Luc Verhaegen
7 * Copyright (c) 2001, Andy Ritger aritger@nvidia.com
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
26 *
27 * Except as contained in this notice, the name of the copyright holder(s)
28 * and author(s) shall not be used in advertising or otherwise to promote
29 * the sale, use or other dealings in this Software without prior written
30 * authorization from the copyright holder(s) and author(s).
31 */
32
33#include <linux/ctype.h>
34#include <linux/export.h>
35#include <linux/fb.h> /* for KHZ2PICOS() */
36#include <linux/list.h>
37#include <linux/list_sort.h>
38#include <linux/of.h>
39
40#include <video/of_display_timing.h>
41#include <video/of_videomode.h>
42#include <video/videomode.h>
43
44#include <drm/drm_crtc.h>
45#include <drm/drm_device.h>
46#include <drm/drm_edid.h>
47#include <drm/drm_modes.h>
48#include <drm/drm_print.h>
49
50#include "drm_crtc_internal.h"
51
52/**
53 * drm_mode_debug_printmodeline - print a mode to dmesg
54 * @mode: mode to print
55 *
56 * Describe @mode using DRM_DEBUG.
57 */
58void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
59{
60 DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
61}
62EXPORT_SYMBOL(drm_mode_debug_printmodeline);
63
64/**
65 * drm_mode_create - create a new display mode
66 * @dev: DRM device
67 *
68 * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
69 * and return it.
70 *
71 * Returns:
72 * Pointer to new mode on success, NULL on error.
73 */
74struct drm_display_mode *drm_mode_create(struct drm_device *dev)
75{
76 struct drm_display_mode *nmode;
77
78 nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
79 if (!nmode)
80 return NULL;
81
82 return nmode;
83}
84EXPORT_SYMBOL(drm_mode_create);
85
86/**
87 * drm_mode_destroy - remove a mode
88 * @dev: DRM device
89 * @mode: mode to remove
90 *
91 * Release @mode's unique ID, then free it @mode structure itself using kfree.
92 */
93void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
94{
95 if (!mode)
96 return;
97
98 kfree(mode);
99}
100EXPORT_SYMBOL(drm_mode_destroy);
101
102/**
103 * drm_mode_probed_add - add a mode to a connector's probed_mode list
104 * @connector: connector the new mode
105 * @mode: mode data
106 *
107 * Add @mode to @connector's probed_mode list for later use. This list should
108 * then in a second step get filtered and all the modes actually supported by
109 * the hardware moved to the @connector's modes list.
110 */
111void drm_mode_probed_add(struct drm_connector *connector,
112 struct drm_display_mode *mode)
113{
114 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
115
116 list_add_tail(&mode->head, &connector->probed_modes);
117}
118EXPORT_SYMBOL(drm_mode_probed_add);
119
120enum drm_mode_analog {
121 DRM_MODE_ANALOG_NTSC, /* 525 lines, 60Hz */
122 DRM_MODE_ANALOG_PAL, /* 625 lines, 50Hz */
123};
124
125/*
126 * The timings come from:
127 * - https://web.archive.org/web/20220406232708/http://www.kolumbus.fi/pami1/video/pal_ntsc.html
128 * - https://web.archive.org/web/20220406124914/http://martin.hinner.info/vga/pal.html
129 * - https://web.archive.org/web/20220609202433/http://www.batsocks.co.uk/readme/video_timing.htm
130 */
131#define NTSC_LINE_DURATION_NS 63556U
132#define NTSC_LINES_NUMBER 525
133
134#define NTSC_HBLK_DURATION_TYP_NS 10900U
135#define NTSC_HBLK_DURATION_MIN_NS (NTSC_HBLK_DURATION_TYP_NS - 200)
136#define NTSC_HBLK_DURATION_MAX_NS (NTSC_HBLK_DURATION_TYP_NS + 200)
137
138#define NTSC_HACT_DURATION_TYP_NS (NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_TYP_NS)
139#define NTSC_HACT_DURATION_MIN_NS (NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_MAX_NS)
140#define NTSC_HACT_DURATION_MAX_NS (NTSC_LINE_DURATION_NS - NTSC_HBLK_DURATION_MIN_NS)
141
142#define NTSC_HFP_DURATION_TYP_NS 1500
143#define NTSC_HFP_DURATION_MIN_NS 1270
144#define NTSC_HFP_DURATION_MAX_NS 2220
145
146#define NTSC_HSLEN_DURATION_TYP_NS 4700
147#define NTSC_HSLEN_DURATION_MIN_NS (NTSC_HSLEN_DURATION_TYP_NS - 100)
148#define NTSC_HSLEN_DURATION_MAX_NS (NTSC_HSLEN_DURATION_TYP_NS + 100)
149
150#define NTSC_HBP_DURATION_TYP_NS 4700
151
152/*
153 * I couldn't find the actual tolerance for the back porch, so let's
154 * just reuse the sync length ones.
155 */
156#define NTSC_HBP_DURATION_MIN_NS (NTSC_HBP_DURATION_TYP_NS - 100)
157#define NTSC_HBP_DURATION_MAX_NS (NTSC_HBP_DURATION_TYP_NS + 100)
158
159#define PAL_LINE_DURATION_NS 64000U
160#define PAL_LINES_NUMBER 625
161
162#define PAL_HACT_DURATION_TYP_NS 51950U
163#define PAL_HACT_DURATION_MIN_NS (PAL_HACT_DURATION_TYP_NS - 100)
164#define PAL_HACT_DURATION_MAX_NS (PAL_HACT_DURATION_TYP_NS + 400)
165
166#define PAL_HBLK_DURATION_TYP_NS (PAL_LINE_DURATION_NS - PAL_HACT_DURATION_TYP_NS)
167#define PAL_HBLK_DURATION_MIN_NS (PAL_LINE_DURATION_NS - PAL_HACT_DURATION_MAX_NS)
168#define PAL_HBLK_DURATION_MAX_NS (PAL_LINE_DURATION_NS - PAL_HACT_DURATION_MIN_NS)
169
170#define PAL_HFP_DURATION_TYP_NS 1650
171#define PAL_HFP_DURATION_MIN_NS (PAL_HFP_DURATION_TYP_NS - 100)
172#define PAL_HFP_DURATION_MAX_NS (PAL_HFP_DURATION_TYP_NS + 400)
173
174#define PAL_HSLEN_DURATION_TYP_NS 4700
175#define PAL_HSLEN_DURATION_MIN_NS (PAL_HSLEN_DURATION_TYP_NS - 200)
176#define PAL_HSLEN_DURATION_MAX_NS (PAL_HSLEN_DURATION_TYP_NS + 200)
177
178#define PAL_HBP_DURATION_TYP_NS 5700
179#define PAL_HBP_DURATION_MIN_NS (PAL_HBP_DURATION_TYP_NS - 200)
180#define PAL_HBP_DURATION_MAX_NS (PAL_HBP_DURATION_TYP_NS + 200)
181
182struct analog_param_field {
183 unsigned int even, odd;
184};
185
186#define PARAM_FIELD(_odd, _even) \
187 { .even = _even, .odd = _odd }
188
189struct analog_param_range {
190 unsigned int min, typ, max;
191};
192
193#define PARAM_RANGE(_min, _typ, _max) \
194 { .min = _min, .typ = _typ, .max = _max }
195
196struct analog_parameters {
197 unsigned int num_lines;
198 unsigned int line_duration_ns;
199
200 struct analog_param_range hact_ns;
201 struct analog_param_range hfp_ns;
202 struct analog_param_range hslen_ns;
203 struct analog_param_range hbp_ns;
204 struct analog_param_range hblk_ns;
205
206 unsigned int bt601_hfp;
207
208 struct analog_param_field vfp_lines;
209 struct analog_param_field vslen_lines;
210 struct analog_param_field vbp_lines;
211};
212
213#define TV_MODE_PARAMETER(_mode, _lines, _line_dur, _hact, _hfp, \
214 _hslen, _hbp, _hblk, _bt601_hfp, _vfp, \
215 _vslen, _vbp) \
216 [_mode] = { \
217 .num_lines = _lines, \
218 .line_duration_ns = _line_dur, \
219 .hact_ns = _hact, \
220 .hfp_ns = _hfp, \
221 .hslen_ns = _hslen, \
222 .hbp_ns = _hbp, \
223 .hblk_ns = _hblk, \
224 .bt601_hfp = _bt601_hfp, \
225 .vfp_lines = _vfp, \
226 .vslen_lines = _vslen, \
227 .vbp_lines = _vbp, \
228 }
229
230static const struct analog_parameters tv_modes_parameters[] = {
231 TV_MODE_PARAMETER(DRM_MODE_ANALOG_NTSC,
232 NTSC_LINES_NUMBER,
233 NTSC_LINE_DURATION_NS,
234 PARAM_RANGE(NTSC_HACT_DURATION_MIN_NS,
235 NTSC_HACT_DURATION_TYP_NS,
236 NTSC_HACT_DURATION_MAX_NS),
237 PARAM_RANGE(NTSC_HFP_DURATION_MIN_NS,
238 NTSC_HFP_DURATION_TYP_NS,
239 NTSC_HFP_DURATION_MAX_NS),
240 PARAM_RANGE(NTSC_HSLEN_DURATION_MIN_NS,
241 NTSC_HSLEN_DURATION_TYP_NS,
242 NTSC_HSLEN_DURATION_MAX_NS),
243 PARAM_RANGE(NTSC_HBP_DURATION_MIN_NS,
244 NTSC_HBP_DURATION_TYP_NS,
245 NTSC_HBP_DURATION_MAX_NS),
246 PARAM_RANGE(NTSC_HBLK_DURATION_MIN_NS,
247 NTSC_HBLK_DURATION_TYP_NS,
248 NTSC_HBLK_DURATION_MAX_NS),
249 16,
250 PARAM_FIELD(3, 3),
251 PARAM_FIELD(3, 3),
252 PARAM_FIELD(16, 17)),
253 TV_MODE_PARAMETER(DRM_MODE_ANALOG_PAL,
254 PAL_LINES_NUMBER,
255 PAL_LINE_DURATION_NS,
256 PARAM_RANGE(PAL_HACT_DURATION_MIN_NS,
257 PAL_HACT_DURATION_TYP_NS,
258 PAL_HACT_DURATION_MAX_NS),
259 PARAM_RANGE(PAL_HFP_DURATION_MIN_NS,
260 PAL_HFP_DURATION_TYP_NS,
261 PAL_HFP_DURATION_MAX_NS),
262 PARAM_RANGE(PAL_HSLEN_DURATION_MIN_NS,
263 PAL_HSLEN_DURATION_TYP_NS,
264 PAL_HSLEN_DURATION_MAX_NS),
265 PARAM_RANGE(PAL_HBP_DURATION_MIN_NS,
266 PAL_HBP_DURATION_TYP_NS,
267 PAL_HBP_DURATION_MAX_NS),
268 PARAM_RANGE(PAL_HBLK_DURATION_MIN_NS,
269 PAL_HBLK_DURATION_TYP_NS,
270 PAL_HBLK_DURATION_MAX_NS),
271 12,
272
273 /*
274 * The front porch is actually 6 short sync
275 * pulses for the even field, and 5 for the
276 * odd field. Each sync takes half a life so
277 * the odd field front porch is shorter by
278 * half a line.
279 *
280 * In progressive, we're supposed to use 6
281 * pulses, so we're fine there
282 */
283 PARAM_FIELD(3, 2),
284
285 /*
286 * The vsync length is 5 long sync pulses,
287 * each field taking half a line. We're
288 * shorter for both fields by half a line.
289 *
290 * In progressive, we're supposed to use 5
291 * pulses, so we're off by half
292 * a line.
293 *
294 * In interlace, we're now off by half a line
295 * for the even field and one line for the odd
296 * field.
297 */
298 PARAM_FIELD(3, 3),
299
300 /*
301 * The back porch starts with post-equalizing
302 * pulses, consisting in 5 short sync pulses
303 * for the even field, 4 for the odd field. In
304 * progressive, it's 5 short syncs.
305 *
306 * In progressive, we thus have 2.5 lines,
307 * plus the 0.5 line we were missing
308 * previously, so we should use 3 lines.
309 *
310 * In interlace, the even field is in the
311 * exact same case than progressive. For the
312 * odd field, we should be using 2 lines but
313 * we're one line short, so we'll make up for
314 * it here by using 3.
315 *
316 * The entire blanking area is supposed to
317 * take 25 lines, so we also need to account
318 * for the rest of the blanking area that
319 * can't be in either the front porch or sync
320 * period.
321 */
322 PARAM_FIELD(19, 20)),
323};
324
325static int fill_analog_mode(struct drm_device *dev,
326 struct drm_display_mode *mode,
327 const struct analog_parameters *params,
328 unsigned long pixel_clock_hz,
329 unsigned int hactive,
330 unsigned int vactive,
331 bool interlace)
332{
333 unsigned long pixel_duration_ns = NSEC_PER_SEC / pixel_clock_hz;
334 unsigned int htotal, vtotal;
335 unsigned int max_hact, hact_duration_ns;
336 unsigned int hblk, hblk_duration_ns;
337 unsigned int hfp, hfp_duration_ns;
338 unsigned int hslen, hslen_duration_ns;
339 unsigned int hbp, hbp_duration_ns;
340 unsigned int porches, porches_duration_ns;
341 unsigned int vfp, vfp_min;
342 unsigned int vbp, vbp_min;
343 unsigned int vslen;
344 bool bt601 = false;
345 int porches_rem;
346 u64 result;
347
348 drm_dbg_kms(dev,
349 "Generating a %ux%u%c, %u-line mode with a %lu kHz clock\n",
350 hactive, vactive,
351 interlace ? 'i' : 'p',
352 params->num_lines,
353 pixel_clock_hz / 1000);
354
355 max_hact = params->hact_ns.max / pixel_duration_ns;
356 if (pixel_clock_hz == 13500000 && hactive > max_hact && hactive <= 720) {
357 drm_dbg_kms(dev, "Trying to generate a BT.601 mode. Disabling checks.\n");
358 bt601 = true;
359 }
360
361 /*
362 * Our pixel duration is going to be round down by the division,
363 * so rounding up is probably going to introduce even more
364 * deviation.
365 */
366 result = (u64)params->line_duration_ns * pixel_clock_hz;
367 do_div(result, NSEC_PER_SEC);
368 htotal = result;
369
370 drm_dbg_kms(dev, "Total Horizontal Number of Pixels: %u\n", htotal);
371
372 hact_duration_ns = hactive * pixel_duration_ns;
373 if (!bt601 &&
374 (hact_duration_ns < params->hact_ns.min ||
375 hact_duration_ns > params->hact_ns.max)) {
376 drm_err(dev, "Invalid horizontal active area duration: %uns (min: %u, max %u)\n",
377 hact_duration_ns, params->hact_ns.min, params->hact_ns.max);
378 return -EINVAL;
379 }
380
381 hblk = htotal - hactive;
382 drm_dbg_kms(dev, "Horizontal Blanking Period: %u\n", hblk);
383
384 hblk_duration_ns = hblk * pixel_duration_ns;
385 if (!bt601 &&
386 (hblk_duration_ns < params->hblk_ns.min ||
387 hblk_duration_ns > params->hblk_ns.max)) {
388 drm_err(dev, "Invalid horizontal blanking duration: %uns (min: %u, max %u)\n",
389 hblk_duration_ns, params->hblk_ns.min, params->hblk_ns.max);
390 return -EINVAL;
391 }
392
393 hslen = DIV_ROUND_UP(params->hslen_ns.typ, pixel_duration_ns);
394 drm_dbg_kms(dev, "Horizontal Sync Period: %u\n", hslen);
395
396 hslen_duration_ns = hslen * pixel_duration_ns;
397 if (!bt601 &&
398 (hslen_duration_ns < params->hslen_ns.min ||
399 hslen_duration_ns > params->hslen_ns.max)) {
400 drm_err(dev, "Invalid horizontal sync duration: %uns (min: %u, max %u)\n",
401 hslen_duration_ns, params->hslen_ns.min, params->hslen_ns.max);
402 return -EINVAL;
403 }
404
405 porches = hblk - hslen;
406 drm_dbg_kms(dev, "Remaining horizontal pixels for both porches: %u\n", porches);
407
408 porches_duration_ns = porches * pixel_duration_ns;
409 if (!bt601 &&
410 (porches_duration_ns > (params->hfp_ns.max + params->hbp_ns.max) ||
411 porches_duration_ns < (params->hfp_ns.min + params->hbp_ns.min))) {
412 drm_err(dev, "Invalid horizontal porches duration: %uns\n",
413 porches_duration_ns);
414 return -EINVAL;
415 }
416
417 if (bt601) {
418 hfp = params->bt601_hfp;
419 } else {
420 unsigned int hfp_min = DIV_ROUND_UP(params->hfp_ns.min,
421 pixel_duration_ns);
422 unsigned int hbp_min = DIV_ROUND_UP(params->hbp_ns.min,
423 pixel_duration_ns);
424 int porches_rem = porches - hfp_min - hbp_min;
425
426 hfp = hfp_min + DIV_ROUND_UP(porches_rem, 2);
427 }
428
429 drm_dbg_kms(dev, "Horizontal Front Porch: %u\n", hfp);
430
431 hfp_duration_ns = hfp * pixel_duration_ns;
432 if (!bt601 &&
433 (hfp_duration_ns < params->hfp_ns.min ||
434 hfp_duration_ns > params->hfp_ns.max)) {
435 drm_err(dev, "Invalid horizontal front porch duration: %uns (min: %u, max %u)\n",
436 hfp_duration_ns, params->hfp_ns.min, params->hfp_ns.max);
437 return -EINVAL;
438 }
439
440 hbp = porches - hfp;
441 drm_dbg_kms(dev, "Horizontal Back Porch: %u\n", hbp);
442
443 hbp_duration_ns = hbp * pixel_duration_ns;
444 if (!bt601 &&
445 (hbp_duration_ns < params->hbp_ns.min ||
446 hbp_duration_ns > params->hbp_ns.max)) {
447 drm_err(dev, "Invalid horizontal back porch duration: %uns (min: %u, max %u)\n",
448 hbp_duration_ns, params->hbp_ns.min, params->hbp_ns.max);
449 return -EINVAL;
450 }
451
452 if (htotal != (hactive + hfp + hslen + hbp))
453 return -EINVAL;
454
455 mode->clock = pixel_clock_hz / 1000;
456 mode->hdisplay = hactive;
457 mode->hsync_start = mode->hdisplay + hfp;
458 mode->hsync_end = mode->hsync_start + hslen;
459 mode->htotal = mode->hsync_end + hbp;
460
461 if (interlace) {
462 vfp_min = params->vfp_lines.even + params->vfp_lines.odd;
463 vbp_min = params->vbp_lines.even + params->vbp_lines.odd;
464 vslen = params->vslen_lines.even + params->vslen_lines.odd;
465 } else {
466 /*
467 * By convention, NTSC (aka 525/60) systems start with
468 * the even field, but PAL (aka 625/50) systems start
469 * with the odd one.
470 *
471 * PAL systems also have asymmetric timings between the
472 * even and odd field, while NTSC is symmetric.
473 *
474 * Moreover, if we want to create a progressive mode for
475 * PAL, we need to use the odd field timings.
476 *
477 * Since odd == even for NTSC, we can just use the odd
478 * one all the time to simplify the code a bit.
479 */
480 vfp_min = params->vfp_lines.odd;
481 vbp_min = params->vbp_lines.odd;
482 vslen = params->vslen_lines.odd;
483 }
484
485 drm_dbg_kms(dev, "Vertical Sync Period: %u\n", vslen);
486
487 porches = params->num_lines - vactive - vslen;
488 drm_dbg_kms(dev, "Remaining vertical pixels for both porches: %u\n", porches);
489
490 porches_rem = porches - vfp_min - vbp_min;
491 vfp = vfp_min + (porches_rem / 2);
492 drm_dbg_kms(dev, "Vertical Front Porch: %u\n", vfp);
493
494 vbp = porches - vfp;
495 drm_dbg_kms(dev, "Vertical Back Porch: %u\n", vbp);
496
497 vtotal = vactive + vfp + vslen + vbp;
498 if (params->num_lines != vtotal) {
499 drm_err(dev, "Invalid vertical total: %upx (expected %upx)\n",
500 vtotal, params->num_lines);
501 return -EINVAL;
502 }
503
504 mode->vdisplay = vactive;
505 mode->vsync_start = mode->vdisplay + vfp;
506 mode->vsync_end = mode->vsync_start + vslen;
507 mode->vtotal = mode->vsync_end + vbp;
508
509 if (mode->vtotal != params->num_lines)
510 return -EINVAL;
511
512 mode->type = DRM_MODE_TYPE_DRIVER;
513 mode->flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC;
514 if (interlace)
515 mode->flags |= DRM_MODE_FLAG_INTERLACE;
516
517 drm_mode_set_name(mode);
518
519 drm_dbg_kms(dev, "Generated mode " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
520
521 return 0;
522}
523
524/**
525 * drm_analog_tv_mode - create a display mode for an analog TV
526 * @dev: drm device
527 * @tv_mode: TV Mode standard to create a mode for. See DRM_MODE_TV_MODE_*.
528 * @pixel_clock_hz: Pixel Clock Frequency, in Hertz
529 * @hdisplay: hdisplay size
530 * @vdisplay: vdisplay size
531 * @interlace: whether to compute an interlaced mode
532 *
533 * This function creates a struct drm_display_mode instance suited for
534 * an analog TV output, for one of the usual analog TV modes. Where
535 * this is DRM_MODE_TV_MODE_MONOCHROME, a 625-line mode will be created.
536 *
537 * Note that @hdisplay is larger than the usual constraints for the PAL
538 * and NTSC timings, and we'll choose to ignore most timings constraints
539 * to reach those resolutions.
540 *
541 * Returns:
542 * A pointer to the mode, allocated with drm_mode_create(). Returns NULL
543 * on error.
544 */
545struct drm_display_mode *drm_analog_tv_mode(struct drm_device *dev,
546 enum drm_connector_tv_mode tv_mode,
547 unsigned long pixel_clock_hz,
548 unsigned int hdisplay,
549 unsigned int vdisplay,
550 bool interlace)
551{
552 struct drm_display_mode *mode;
553 enum drm_mode_analog analog;
554 int ret;
555
556 switch (tv_mode) {
557 case DRM_MODE_TV_MODE_NTSC:
558 fallthrough;
559 case DRM_MODE_TV_MODE_NTSC_443:
560 fallthrough;
561 case DRM_MODE_TV_MODE_NTSC_J:
562 fallthrough;
563 case DRM_MODE_TV_MODE_PAL_M:
564 analog = DRM_MODE_ANALOG_NTSC;
565 break;
566
567 case DRM_MODE_TV_MODE_PAL:
568 fallthrough;
569 case DRM_MODE_TV_MODE_PAL_N:
570 fallthrough;
571 case DRM_MODE_TV_MODE_SECAM:
572 fallthrough;
573 case DRM_MODE_TV_MODE_MONOCHROME:
574 analog = DRM_MODE_ANALOG_PAL;
575 break;
576
577 default:
578 return NULL;
579 }
580
581 mode = drm_mode_create(dev);
582 if (!mode)
583 return NULL;
584
585 ret = fill_analog_mode(dev, mode,
586 &tv_modes_parameters[analog],
587 pixel_clock_hz, hdisplay, vdisplay, interlace);
588 if (ret)
589 goto err_free_mode;
590
591 return mode;
592
593err_free_mode:
594 drm_mode_destroy(dev, mode);
595 return NULL;
596}
597EXPORT_SYMBOL(drm_analog_tv_mode);
598
599/**
600 * drm_cvt_mode -create a modeline based on the CVT algorithm
601 * @dev: drm device
602 * @hdisplay: hdisplay size
603 * @vdisplay: vdisplay size
604 * @vrefresh: vrefresh rate
605 * @reduced: whether to use reduced blanking
606 * @interlaced: whether to compute an interlaced mode
607 * @margins: whether to add margins (borders)
608 *
609 * This function is called to generate the modeline based on CVT algorithm
610 * according to the hdisplay, vdisplay, vrefresh.
611 * It is based from the VESA(TM) Coordinated Video Timing Generator by
612 * Graham Loveridge April 9, 2003 available at
613 * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
614 *
615 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
616 * What I have done is to translate it by using integer calculation.
617 *
618 * Returns:
619 * The modeline based on the CVT algorithm stored in a drm_display_mode object.
620 * The display mode object is allocated with drm_mode_create(). Returns NULL
621 * when no mode could be allocated.
622 */
623struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
624 int vdisplay, int vrefresh,
625 bool reduced, bool interlaced, bool margins)
626{
627#define HV_FACTOR 1000
628 /* 1) top/bottom margin size (% of height) - default: 1.8, */
629#define CVT_MARGIN_PERCENTAGE 18
630 /* 2) character cell horizontal granularity (pixels) - default 8 */
631#define CVT_H_GRANULARITY 8
632 /* 3) Minimum vertical porch (lines) - default 3 */
633#define CVT_MIN_V_PORCH 3
634 /* 4) Minimum number of vertical back porch lines - default 6 */
635#define CVT_MIN_V_BPORCH 6
636 /* Pixel Clock step (kHz) */
637#define CVT_CLOCK_STEP 250
638 struct drm_display_mode *drm_mode;
639 unsigned int vfieldrate, hperiod;
640 int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
641 int interlace;
642 u64 tmp;
643
644 if (!hdisplay || !vdisplay)
645 return NULL;
646
647 /* allocate the drm_display_mode structure. If failure, we will
648 * return directly
649 */
650 drm_mode = drm_mode_create(dev);
651 if (!drm_mode)
652 return NULL;
653
654 /* the CVT default refresh rate is 60Hz */
655 if (!vrefresh)
656 vrefresh = 60;
657
658 /* the required field fresh rate */
659 if (interlaced)
660 vfieldrate = vrefresh * 2;
661 else
662 vfieldrate = vrefresh;
663
664 /* horizontal pixels */
665 hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
666
667 /* determine the left&right borders */
668 hmargin = 0;
669 if (margins) {
670 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
671 hmargin -= hmargin % CVT_H_GRANULARITY;
672 }
673 /* find the total active pixels */
674 drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
675
676 /* find the number of lines per field */
677 if (interlaced)
678 vdisplay_rnd = vdisplay / 2;
679 else
680 vdisplay_rnd = vdisplay;
681
682 /* find the top & bottom borders */
683 vmargin = 0;
684 if (margins)
685 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
686
687 drm_mode->vdisplay = vdisplay + 2 * vmargin;
688
689 /* Interlaced */
690 if (interlaced)
691 interlace = 1;
692 else
693 interlace = 0;
694
695 /* Determine VSync Width from aspect ratio */
696 if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
697 vsync = 4;
698 else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
699 vsync = 5;
700 else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
701 vsync = 6;
702 else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
703 vsync = 7;
704 else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
705 vsync = 7;
706 else /* custom */
707 vsync = 10;
708
709 if (!reduced) {
710 /* simplify the GTF calculation */
711 /* 4) Minimum time of vertical sync + back porch interval (µs)
712 * default 550.0
713 */
714 int tmp1, tmp2;
715#define CVT_MIN_VSYNC_BP 550
716 /* 3) Nominal HSync width (% of line period) - default 8 */
717#define CVT_HSYNC_PERCENTAGE 8
718 unsigned int hblank_percentage;
719 int vsyncandback_porch, __maybe_unused vback_porch, hblank;
720
721 /* estimated the horizontal period */
722 tmp1 = HV_FACTOR * 1000000 -
723 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
724 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
725 interlace;
726 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
727
728 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
729 /* 9. Find number of lines in sync + backporch */
730 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
731 vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
732 else
733 vsyncandback_porch = tmp1;
734 /* 10. Find number of lines in back porch */
735 vback_porch = vsyncandback_porch - vsync;
736 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
737 vsyncandback_porch + CVT_MIN_V_PORCH;
738 /* 5) Definition of Horizontal blanking time limitation */
739 /* Gradient (%/kHz) - default 600 */
740#define CVT_M_FACTOR 600
741 /* Offset (%) - default 40 */
742#define CVT_C_FACTOR 40
743 /* Blanking time scaling factor - default 128 */
744#define CVT_K_FACTOR 128
745 /* Scaling factor weighting - default 20 */
746#define CVT_J_FACTOR 20
747#define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256)
748#define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
749 CVT_J_FACTOR)
750 /* 12. Find ideal blanking duty cycle from formula */
751 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
752 hperiod / 1000;
753 /* 13. Blanking time */
754 if (hblank_percentage < 20 * HV_FACTOR)
755 hblank_percentage = 20 * HV_FACTOR;
756 hblank = drm_mode->hdisplay * hblank_percentage /
757 (100 * HV_FACTOR - hblank_percentage);
758 hblank -= hblank % (2 * CVT_H_GRANULARITY);
759 /* 14. find the total pixels per line */
760 drm_mode->htotal = drm_mode->hdisplay + hblank;
761 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
762 drm_mode->hsync_start = drm_mode->hsync_end -
763 (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
764 drm_mode->hsync_start += CVT_H_GRANULARITY -
765 drm_mode->hsync_start % CVT_H_GRANULARITY;
766 /* fill the Vsync values */
767 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
768 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
769 } else {
770 /* Reduced blanking */
771 /* Minimum vertical blanking interval time (µs)- default 460 */
772#define CVT_RB_MIN_VBLANK 460
773 /* Fixed number of clocks for horizontal sync */
774#define CVT_RB_H_SYNC 32
775 /* Fixed number of clocks for horizontal blanking */
776#define CVT_RB_H_BLANK 160
777 /* Fixed number of lines for vertical front porch - default 3*/
778#define CVT_RB_VFPORCH 3
779 int vbilines;
780 int tmp1, tmp2;
781 /* 8. Estimate Horizontal period. */
782 tmp1 = HV_FACTOR * 1000000 -
783 CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
784 tmp2 = vdisplay_rnd + 2 * vmargin;
785 hperiod = tmp1 / (tmp2 * vfieldrate);
786 /* 9. Find number of lines in vertical blanking */
787 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
788 /* 10. Check if vertical blanking is sufficient */
789 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
790 vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
791 /* 11. Find total number of lines in vertical field */
792 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
793 /* 12. Find total number of pixels in a line */
794 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
795 /* Fill in HSync values */
796 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
797 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
798 /* Fill in VSync values */
799 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
800 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
801 }
802 /* 15/13. Find pixel clock frequency (kHz for xf86) */
803 tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
804 tmp *= HV_FACTOR * 1000;
805 do_div(tmp, hperiod);
806 tmp -= drm_mode->clock % CVT_CLOCK_STEP;
807 drm_mode->clock = tmp;
808 /* 18/16. Find actual vertical frame frequency */
809 /* ignore - just set the mode flag for interlaced */
810 if (interlaced) {
811 drm_mode->vtotal *= 2;
812 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
813 }
814 /* Fill the mode line name */
815 drm_mode_set_name(drm_mode);
816 if (reduced)
817 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
818 DRM_MODE_FLAG_NVSYNC);
819 else
820 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
821 DRM_MODE_FLAG_NHSYNC);
822
823 return drm_mode;
824}
825EXPORT_SYMBOL(drm_cvt_mode);
826
827/**
828 * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
829 * @dev: drm device
830 * @hdisplay: hdisplay size
831 * @vdisplay: vdisplay size
832 * @vrefresh: vrefresh rate.
833 * @interlaced: whether to compute an interlaced mode
834 * @margins: desired margin (borders) size
835 * @GTF_M: extended GTF formula parameters
836 * @GTF_2C: extended GTF formula parameters
837 * @GTF_K: extended GTF formula parameters
838 * @GTF_2J: extended GTF formula parameters
839 *
840 * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
841 * in here multiplied by two. For a C of 40, pass in 80.
842 *
843 * Returns:
844 * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
845 * The display mode object is allocated with drm_mode_create(). Returns NULL
846 * when no mode could be allocated.
847 */
848struct drm_display_mode *
849drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
850 int vrefresh, bool interlaced, int margins,
851 int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
852{ /* 1) top/bottom margin size (% of height) - default: 1.8, */
853#define GTF_MARGIN_PERCENTAGE 18
854 /* 2) character cell horizontal granularity (pixels) - default 8 */
855#define GTF_CELL_GRAN 8
856 /* 3) Minimum vertical porch (lines) - default 3 */
857#define GTF_MIN_V_PORCH 1
858 /* width of vsync in lines */
859#define V_SYNC_RQD 3
860 /* width of hsync as % of total line */
861#define H_SYNC_PERCENT 8
862 /* min time of vsync + back porch (microsec) */
863#define MIN_VSYNC_PLUS_BP 550
864 /* C' and M' are part of the Blanking Duty Cycle computation */
865#define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
866#define GTF_M_PRIME (GTF_K * GTF_M / 256)
867 struct drm_display_mode *drm_mode;
868 unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
869 int top_margin, bottom_margin;
870 int interlace;
871 unsigned int hfreq_est;
872 int vsync_plus_bp, __maybe_unused vback_porch;
873 unsigned int vtotal_lines, __maybe_unused vfieldrate_est;
874 unsigned int __maybe_unused hperiod;
875 unsigned int vfield_rate, __maybe_unused vframe_rate;
876 int left_margin, right_margin;
877 unsigned int total_active_pixels, ideal_duty_cycle;
878 unsigned int hblank, total_pixels, pixel_freq;
879 int hsync, hfront_porch, vodd_front_porch_lines;
880 unsigned int tmp1, tmp2;
881
882 if (!hdisplay || !vdisplay)
883 return NULL;
884
885 drm_mode = drm_mode_create(dev);
886 if (!drm_mode)
887 return NULL;
888
889 /* 1. In order to give correct results, the number of horizontal
890 * pixels requested is first processed to ensure that it is divisible
891 * by the character size, by rounding it to the nearest character
892 * cell boundary:
893 */
894 hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
895 hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
896
897 /* 2. If interlace is requested, the number of vertical lines assumed
898 * by the calculation must be halved, as the computation calculates
899 * the number of vertical lines per field.
900 */
901 if (interlaced)
902 vdisplay_rnd = vdisplay / 2;
903 else
904 vdisplay_rnd = vdisplay;
905
906 /* 3. Find the frame rate required: */
907 if (interlaced)
908 vfieldrate_rqd = vrefresh * 2;
909 else
910 vfieldrate_rqd = vrefresh;
911
912 /* 4. Find number of lines in Top margin: */
913 top_margin = 0;
914 if (margins)
915 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
916 1000;
917 /* 5. Find number of lines in bottom margin: */
918 bottom_margin = top_margin;
919
920 /* 6. If interlace is required, then set variable interlace: */
921 if (interlaced)
922 interlace = 1;
923 else
924 interlace = 0;
925
926 /* 7. Estimate the Horizontal frequency */
927 {
928 tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
929 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
930 2 + interlace;
931 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
932 }
933
934 /* 8. Find the number of lines in V sync + back porch */
935 /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
936 vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
937 vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
938 /* 9. Find the number of lines in V back porch alone: */
939 vback_porch = vsync_plus_bp - V_SYNC_RQD;
940 /* 10. Find the total number of lines in Vertical field period: */
941 vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
942 vsync_plus_bp + GTF_MIN_V_PORCH;
943 /* 11. Estimate the Vertical field frequency: */
944 vfieldrate_est = hfreq_est / vtotal_lines;
945 /* 12. Find the actual horizontal period: */
946 hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
947
948 /* 13. Find the actual Vertical field frequency: */
949 vfield_rate = hfreq_est / vtotal_lines;
950 /* 14. Find the Vertical frame frequency: */
951 if (interlaced)
952 vframe_rate = vfield_rate / 2;
953 else
954 vframe_rate = vfield_rate;
955 /* 15. Find number of pixels in left margin: */
956 if (margins)
957 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
958 1000;
959 else
960 left_margin = 0;
961
962 /* 16.Find number of pixels in right margin: */
963 right_margin = left_margin;
964 /* 17.Find total number of active pixels in image and left and right */
965 total_active_pixels = hdisplay_rnd + left_margin + right_margin;
966 /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
967 ideal_duty_cycle = GTF_C_PRIME * 1000 -
968 (GTF_M_PRIME * 1000000 / hfreq_est);
969 /* 19.Find the number of pixels in the blanking time to the nearest
970 * double character cell: */
971 hblank = total_active_pixels * ideal_duty_cycle /
972 (100000 - ideal_duty_cycle);
973 hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
974 hblank = hblank * 2 * GTF_CELL_GRAN;
975 /* 20.Find total number of pixels: */
976 total_pixels = total_active_pixels + hblank;
977 /* 21.Find pixel clock frequency: */
978 pixel_freq = total_pixels * hfreq_est / 1000;
979 /* Stage 1 computations are now complete; I should really pass
980 * the results to another function and do the Stage 2 computations,
981 * but I only need a few more values so I'll just append the
982 * computations here for now */
983 /* 17. Find the number of pixels in the horizontal sync period: */
984 hsync = H_SYNC_PERCENT * total_pixels / 100;
985 hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
986 hsync = hsync * GTF_CELL_GRAN;
987 /* 18. Find the number of pixels in horizontal front porch period */
988 hfront_porch = hblank / 2 - hsync;
989 /* 36. Find the number of lines in the odd front porch period: */
990 vodd_front_porch_lines = GTF_MIN_V_PORCH ;
991
992 /* finally, pack the results in the mode struct */
993 drm_mode->hdisplay = hdisplay_rnd;
994 drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
995 drm_mode->hsync_end = drm_mode->hsync_start + hsync;
996 drm_mode->htotal = total_pixels;
997 drm_mode->vdisplay = vdisplay_rnd;
998 drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
999 drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
1000 drm_mode->vtotal = vtotal_lines;
1001
1002 drm_mode->clock = pixel_freq;
1003
1004 if (interlaced) {
1005 drm_mode->vtotal *= 2;
1006 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
1007 }
1008
1009 drm_mode_set_name(drm_mode);
1010 if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
1011 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
1012 else
1013 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
1014
1015 return drm_mode;
1016}
1017EXPORT_SYMBOL(drm_gtf_mode_complex);
1018
1019/**
1020 * drm_gtf_mode - create the modeline based on the GTF algorithm
1021 * @dev: drm device
1022 * @hdisplay: hdisplay size
1023 * @vdisplay: vdisplay size
1024 * @vrefresh: vrefresh rate.
1025 * @interlaced: whether to compute an interlaced mode
1026 * @margins: desired margin (borders) size
1027 *
1028 * return the modeline based on GTF algorithm
1029 *
1030 * This function is to create the modeline based on the GTF algorithm.
1031 * Generalized Timing Formula is derived from:
1032 *
1033 * GTF Spreadsheet by Andy Morrish (1/5/97)
1034 * available at https://www.vesa.org
1035 *
1036 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
1037 * What I have done is to translate it by using integer calculation.
1038 * I also refer to the function of fb_get_mode in the file of
1039 * drivers/video/fbmon.c
1040 *
1041 * Standard GTF parameters::
1042 *
1043 * M = 600
1044 * C = 40
1045 * K = 128
1046 * J = 20
1047 *
1048 * Returns:
1049 * The modeline based on the GTF algorithm stored in a drm_display_mode object.
1050 * The display mode object is allocated with drm_mode_create(). Returns NULL
1051 * when no mode could be allocated.
1052 */
1053struct drm_display_mode *
1054drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
1055 bool interlaced, int margins)
1056{
1057 return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
1058 interlaced, margins,
1059 600, 40 * 2, 128, 20 * 2);
1060}
1061EXPORT_SYMBOL(drm_gtf_mode);
1062
1063#ifdef CONFIG_VIDEOMODE_HELPERS
1064/**
1065 * drm_display_mode_from_videomode - fill in @dmode using @vm,
1066 * @vm: videomode structure to use as source
1067 * @dmode: drm_display_mode structure to use as destination
1068 *
1069 * Fills out @dmode using the display mode specified in @vm.
1070 */
1071void drm_display_mode_from_videomode(const struct videomode *vm,
1072 struct drm_display_mode *dmode)
1073{
1074 dmode->hdisplay = vm->hactive;
1075 dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
1076 dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
1077 dmode->htotal = dmode->hsync_end + vm->hback_porch;
1078
1079 dmode->vdisplay = vm->vactive;
1080 dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
1081 dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
1082 dmode->vtotal = dmode->vsync_end + vm->vback_porch;
1083
1084 dmode->clock = vm->pixelclock / 1000;
1085
1086 dmode->flags = 0;
1087 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
1088 dmode->flags |= DRM_MODE_FLAG_PHSYNC;
1089 else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
1090 dmode->flags |= DRM_MODE_FLAG_NHSYNC;
1091 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
1092 dmode->flags |= DRM_MODE_FLAG_PVSYNC;
1093 else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
1094 dmode->flags |= DRM_MODE_FLAG_NVSYNC;
1095 if (vm->flags & DISPLAY_FLAGS_INTERLACED)
1096 dmode->flags |= DRM_MODE_FLAG_INTERLACE;
1097 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
1098 dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
1099 if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
1100 dmode->flags |= DRM_MODE_FLAG_DBLCLK;
1101 drm_mode_set_name(dmode);
1102}
1103EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
1104
1105/**
1106 * drm_display_mode_to_videomode - fill in @vm using @dmode,
1107 * @dmode: drm_display_mode structure to use as source
1108 * @vm: videomode structure to use as destination
1109 *
1110 * Fills out @vm using the display mode specified in @dmode.
1111 */
1112void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
1113 struct videomode *vm)
1114{
1115 vm->hactive = dmode->hdisplay;
1116 vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
1117 vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
1118 vm->hback_porch = dmode->htotal - dmode->hsync_end;
1119
1120 vm->vactive = dmode->vdisplay;
1121 vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
1122 vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
1123 vm->vback_porch = dmode->vtotal - dmode->vsync_end;
1124
1125 vm->pixelclock = dmode->clock * 1000;
1126
1127 vm->flags = 0;
1128 if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
1129 vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
1130 else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
1131 vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
1132 if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
1133 vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
1134 else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
1135 vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
1136 if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
1137 vm->flags |= DISPLAY_FLAGS_INTERLACED;
1138 if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
1139 vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
1140 if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
1141 vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
1142}
1143EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
1144
1145/**
1146 * drm_bus_flags_from_videomode - extract information about pixelclk and
1147 * DE polarity from videomode and store it in a separate variable
1148 * @vm: videomode structure to use
1149 * @bus_flags: information about pixelclk, sync and DE polarity will be stored
1150 * here
1151 *
1152 * Sets DRM_BUS_FLAG_DE_(LOW|HIGH), DRM_BUS_FLAG_PIXDATA_DRIVE_(POS|NEG)EDGE
1153 * and DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
1154 * found in @vm
1155 */
1156void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
1157{
1158 *bus_flags = 0;
1159 if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
1160 *bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
1161 if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
1162 *bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
1163
1164 if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
1165 *bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE;
1166 if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
1167 *bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE;
1168
1169 if (vm->flags & DISPLAY_FLAGS_DE_LOW)
1170 *bus_flags |= DRM_BUS_FLAG_DE_LOW;
1171 if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
1172 *bus_flags |= DRM_BUS_FLAG_DE_HIGH;
1173}
1174EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
1175
1176#ifdef CONFIG_OF
1177/**
1178 * of_get_drm_display_mode - get a drm_display_mode from devicetree
1179 * @np: device_node with the timing specification
1180 * @dmode: will be set to the return value
1181 * @bus_flags: information about pixelclk, sync and DE polarity
1182 * @index: index into the list of display timings in devicetree
1183 *
1184 * This function is expensive and should only be used, if only one mode is to be
1185 * read from DT. To get multiple modes start with of_get_display_timings and
1186 * work with that instead.
1187 *
1188 * Returns:
1189 * 0 on success, a negative errno code when no of videomode node was found.
1190 */
1191int of_get_drm_display_mode(struct device_node *np,
1192 struct drm_display_mode *dmode, u32 *bus_flags,
1193 int index)
1194{
1195 struct videomode vm;
1196 int ret;
1197
1198 ret = of_get_videomode(np, &vm, index);
1199 if (ret)
1200 return ret;
1201
1202 drm_display_mode_from_videomode(&vm, dmode);
1203 if (bus_flags)
1204 drm_bus_flags_from_videomode(&vm, bus_flags);
1205
1206 pr_debug("%pOF: got %dx%d display mode: " DRM_MODE_FMT "\n",
1207 np, vm.hactive, vm.vactive, DRM_MODE_ARG(dmode));
1208
1209 return 0;
1210}
1211EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
1212
1213/**
1214 * of_get_drm_panel_display_mode - get a panel-timing drm_display_mode from devicetree
1215 * @np: device_node with the panel-timing specification
1216 * @dmode: will be set to the return value
1217 * @bus_flags: information about pixelclk, sync and DE polarity
1218 *
1219 * The mandatory Device Tree properties width-mm and height-mm
1220 * are read and set on the display mode.
1221 *
1222 * Returns:
1223 * Zero on success, negative error code on failure.
1224 */
1225int of_get_drm_panel_display_mode(struct device_node *np,
1226 struct drm_display_mode *dmode, u32 *bus_flags)
1227{
1228 u32 width_mm = 0, height_mm = 0;
1229 struct display_timing timing;
1230 struct videomode vm;
1231 int ret;
1232
1233 ret = of_get_display_timing(np, "panel-timing", &timing);
1234 if (ret)
1235 return ret;
1236
1237 videomode_from_timing(&timing, &vm);
1238
1239 memset(dmode, 0, sizeof(*dmode));
1240 drm_display_mode_from_videomode(&vm, dmode);
1241 if (bus_flags)
1242 drm_bus_flags_from_videomode(&vm, bus_flags);
1243
1244 ret = of_property_read_u32(np, "width-mm", &width_mm);
1245 if (ret)
1246 return ret;
1247
1248 ret = of_property_read_u32(np, "height-mm", &height_mm);
1249 if (ret)
1250 return ret;
1251
1252 dmode->width_mm = width_mm;
1253 dmode->height_mm = height_mm;
1254
1255 pr_debug(DRM_MODE_FMT "\n", DRM_MODE_ARG(dmode));
1256
1257 return 0;
1258}
1259EXPORT_SYMBOL_GPL(of_get_drm_panel_display_mode);
1260#endif /* CONFIG_OF */
1261#endif /* CONFIG_VIDEOMODE_HELPERS */
1262
1263/**
1264 * drm_mode_set_name - set the name on a mode
1265 * @mode: name will be set in this mode
1266 *
1267 * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
1268 * with an optional 'i' suffix for interlaced modes.
1269 */
1270void drm_mode_set_name(struct drm_display_mode *mode)
1271{
1272 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1273
1274 snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
1275 mode->hdisplay, mode->vdisplay,
1276 interlaced ? "i" : "");
1277}
1278EXPORT_SYMBOL(drm_mode_set_name);
1279
1280/**
1281 * drm_mode_vrefresh - get the vrefresh of a mode
1282 * @mode: mode
1283 *
1284 * Returns:
1285 * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
1286 * value first if it is not yet set.
1287 */
1288int drm_mode_vrefresh(const struct drm_display_mode *mode)
1289{
1290 unsigned int num = 1, den = 1;
1291
1292 if (mode->htotal == 0 || mode->vtotal == 0)
1293 return 0;
1294
1295 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1296 num *= 2;
1297 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
1298 den *= 2;
1299 if (mode->vscan > 1)
1300 den *= mode->vscan;
1301
1302 if (check_mul_overflow(mode->clock, num, &num))
1303 return 0;
1304
1305 if (check_mul_overflow(mode->htotal * mode->vtotal, den, &den))
1306 return 0;
1307
1308 return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den);
1309}
1310EXPORT_SYMBOL(drm_mode_vrefresh);
1311
1312/**
1313 * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
1314 * @mode: mode to query
1315 * @hdisplay: hdisplay value to fill in
1316 * @vdisplay: vdisplay value to fill in
1317 *
1318 * The vdisplay value will be doubled if the specified mode is a stereo mode of
1319 * the appropriate layout.
1320 */
1321void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
1322 int *hdisplay, int *vdisplay)
1323{
1324 struct drm_display_mode adjusted;
1325
1326 drm_mode_init(&adjusted, mode);
1327
1328 drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
1329 *hdisplay = adjusted.crtc_hdisplay;
1330 *vdisplay = adjusted.crtc_vdisplay;
1331}
1332EXPORT_SYMBOL(drm_mode_get_hv_timing);
1333
1334/**
1335 * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
1336 * @p: mode
1337 * @adjust_flags: a combination of adjustment flags
1338 *
1339 * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
1340 *
1341 * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
1342 * interlaced modes.
1343 * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
1344 * buffers containing two eyes (only adjust the timings when needed, eg. for
1345 * "frame packing" or "side by side full").
1346 * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
1347 * be performed for doublescan and vscan > 1 modes respectively.
1348 */
1349void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
1350{
1351 if (!p)
1352 return;
1353
1354 p->crtc_clock = p->clock;
1355 p->crtc_hdisplay = p->hdisplay;
1356 p->crtc_hsync_start = p->hsync_start;
1357 p->crtc_hsync_end = p->hsync_end;
1358 p->crtc_htotal = p->htotal;
1359 p->crtc_hskew = p->hskew;
1360 p->crtc_vdisplay = p->vdisplay;
1361 p->crtc_vsync_start = p->vsync_start;
1362 p->crtc_vsync_end = p->vsync_end;
1363 p->crtc_vtotal = p->vtotal;
1364
1365 if (p->flags & DRM_MODE_FLAG_INTERLACE) {
1366 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
1367 p->crtc_vdisplay /= 2;
1368 p->crtc_vsync_start /= 2;
1369 p->crtc_vsync_end /= 2;
1370 p->crtc_vtotal /= 2;
1371 }
1372 }
1373
1374 if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
1375 if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
1376 p->crtc_vdisplay *= 2;
1377 p->crtc_vsync_start *= 2;
1378 p->crtc_vsync_end *= 2;
1379 p->crtc_vtotal *= 2;
1380 }
1381 }
1382
1383 if (!(adjust_flags & CRTC_NO_VSCAN)) {
1384 if (p->vscan > 1) {
1385 p->crtc_vdisplay *= p->vscan;
1386 p->crtc_vsync_start *= p->vscan;
1387 p->crtc_vsync_end *= p->vscan;
1388 p->crtc_vtotal *= p->vscan;
1389 }
1390 }
1391
1392 if (adjust_flags & CRTC_STEREO_DOUBLE) {
1393 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
1394
1395 switch (layout) {
1396 case DRM_MODE_FLAG_3D_FRAME_PACKING:
1397 p->crtc_clock *= 2;
1398 p->crtc_vdisplay += p->crtc_vtotal;
1399 p->crtc_vsync_start += p->crtc_vtotal;
1400 p->crtc_vsync_end += p->crtc_vtotal;
1401 p->crtc_vtotal += p->crtc_vtotal;
1402 break;
1403 }
1404 }
1405
1406 p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
1407 p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
1408 p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
1409 p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
1410}
1411EXPORT_SYMBOL(drm_mode_set_crtcinfo);
1412
1413/**
1414 * drm_mode_copy - copy the mode
1415 * @dst: mode to overwrite
1416 * @src: mode to copy
1417 *
1418 * Copy an existing mode into another mode, preserving the
1419 * list head of the destination mode.
1420 */
1421void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
1422{
1423 struct list_head head = dst->head;
1424
1425 *dst = *src;
1426 dst->head = head;
1427}
1428EXPORT_SYMBOL(drm_mode_copy);
1429
1430/**
1431 * drm_mode_init - initialize the mode from another mode
1432 * @dst: mode to overwrite
1433 * @src: mode to copy
1434 *
1435 * Copy an existing mode into another mode, zeroing the
1436 * list head of the destination mode. Typically used
1437 * to guarantee the list head is not left with stack
1438 * garbage in on-stack modes.
1439 */
1440void drm_mode_init(struct drm_display_mode *dst, const struct drm_display_mode *src)
1441{
1442 memset(dst, 0, sizeof(*dst));
1443 drm_mode_copy(dst, src);
1444}
1445EXPORT_SYMBOL(drm_mode_init);
1446
1447/**
1448 * drm_mode_duplicate - allocate and duplicate an existing mode
1449 * @dev: drm_device to allocate the duplicated mode for
1450 * @mode: mode to duplicate
1451 *
1452 * Just allocate a new mode, copy the existing mode into it, and return
1453 * a pointer to it. Used to create new instances of established modes.
1454 *
1455 * Returns:
1456 * Pointer to duplicated mode on success, NULL on error.
1457 */
1458struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
1459 const struct drm_display_mode *mode)
1460{
1461 struct drm_display_mode *nmode;
1462
1463 nmode = drm_mode_create(dev);
1464 if (!nmode)
1465 return NULL;
1466
1467 drm_mode_copy(nmode, mode);
1468
1469 return nmode;
1470}
1471EXPORT_SYMBOL(drm_mode_duplicate);
1472
1473static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
1474 const struct drm_display_mode *mode2)
1475{
1476 return mode1->hdisplay == mode2->hdisplay &&
1477 mode1->hsync_start == mode2->hsync_start &&
1478 mode1->hsync_end == mode2->hsync_end &&
1479 mode1->htotal == mode2->htotal &&
1480 mode1->hskew == mode2->hskew &&
1481 mode1->vdisplay == mode2->vdisplay &&
1482 mode1->vsync_start == mode2->vsync_start &&
1483 mode1->vsync_end == mode2->vsync_end &&
1484 mode1->vtotal == mode2->vtotal &&
1485 mode1->vscan == mode2->vscan;
1486}
1487
1488static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
1489 const struct drm_display_mode *mode2)
1490{
1491 /*
1492 * do clock check convert to PICOS
1493 * so fb modes get matched the same
1494 */
1495 if (mode1->clock && mode2->clock)
1496 return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
1497 else
1498 return mode1->clock == mode2->clock;
1499}
1500
1501static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
1502 const struct drm_display_mode *mode2)
1503{
1504 return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
1505 (mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
1506}
1507
1508static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
1509 const struct drm_display_mode *mode2)
1510{
1511 return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
1512 (mode2->flags & DRM_MODE_FLAG_3D_MASK);
1513}
1514
1515static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
1516 const struct drm_display_mode *mode2)
1517{
1518 return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
1519}
1520
1521/**
1522 * drm_mode_match - test modes for (partial) equality
1523 * @mode1: first mode
1524 * @mode2: second mode
1525 * @match_flags: which parts need to match (DRM_MODE_MATCH_*)
1526 *
1527 * Check to see if @mode1 and @mode2 are equivalent.
1528 *
1529 * Returns:
1530 * True if the modes are (partially) equal, false otherwise.
1531 */
1532bool drm_mode_match(const struct drm_display_mode *mode1,
1533 const struct drm_display_mode *mode2,
1534 unsigned int match_flags)
1535{
1536 if (!mode1 && !mode2)
1537 return true;
1538
1539 if (!mode1 || !mode2)
1540 return false;
1541
1542 if (match_flags & DRM_MODE_MATCH_TIMINGS &&
1543 !drm_mode_match_timings(mode1, mode2))
1544 return false;
1545
1546 if (match_flags & DRM_MODE_MATCH_CLOCK &&
1547 !drm_mode_match_clock(mode1, mode2))
1548 return false;
1549
1550 if (match_flags & DRM_MODE_MATCH_FLAGS &&
1551 !drm_mode_match_flags(mode1, mode2))
1552 return false;
1553
1554 if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
1555 !drm_mode_match_3d_flags(mode1, mode2))
1556 return false;
1557
1558 if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
1559 !drm_mode_match_aspect_ratio(mode1, mode2))
1560 return false;
1561
1562 return true;
1563}
1564EXPORT_SYMBOL(drm_mode_match);
1565
1566/**
1567 * drm_mode_equal - test modes for equality
1568 * @mode1: first mode
1569 * @mode2: second mode
1570 *
1571 * Check to see if @mode1 and @mode2 are equivalent.
1572 *
1573 * Returns:
1574 * True if the modes are equal, false otherwise.
1575 */
1576bool drm_mode_equal(const struct drm_display_mode *mode1,
1577 const struct drm_display_mode *mode2)
1578{
1579 return drm_mode_match(mode1, mode2,
1580 DRM_MODE_MATCH_TIMINGS |
1581 DRM_MODE_MATCH_CLOCK |
1582 DRM_MODE_MATCH_FLAGS |
1583 DRM_MODE_MATCH_3D_FLAGS|
1584 DRM_MODE_MATCH_ASPECT_RATIO);
1585}
1586EXPORT_SYMBOL(drm_mode_equal);
1587
1588/**
1589 * drm_mode_equal_no_clocks - test modes for equality
1590 * @mode1: first mode
1591 * @mode2: second mode
1592 *
1593 * Check to see if @mode1 and @mode2 are equivalent, but
1594 * don't check the pixel clocks.
1595 *
1596 * Returns:
1597 * True if the modes are equal, false otherwise.
1598 */
1599bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
1600 const struct drm_display_mode *mode2)
1601{
1602 return drm_mode_match(mode1, mode2,
1603 DRM_MODE_MATCH_TIMINGS |
1604 DRM_MODE_MATCH_FLAGS |
1605 DRM_MODE_MATCH_3D_FLAGS);
1606}
1607EXPORT_SYMBOL(drm_mode_equal_no_clocks);
1608
1609/**
1610 * drm_mode_equal_no_clocks_no_stereo - test modes for equality
1611 * @mode1: first mode
1612 * @mode2: second mode
1613 *
1614 * Check to see if @mode1 and @mode2 are equivalent, but
1615 * don't check the pixel clocks nor the stereo layout.
1616 *
1617 * Returns:
1618 * True if the modes are equal, false otherwise.
1619 */
1620bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
1621 const struct drm_display_mode *mode2)
1622{
1623 return drm_mode_match(mode1, mode2,
1624 DRM_MODE_MATCH_TIMINGS |
1625 DRM_MODE_MATCH_FLAGS);
1626}
1627EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
1628
1629static enum drm_mode_status
1630drm_mode_validate_basic(const struct drm_display_mode *mode)
1631{
1632 if (mode->type & ~DRM_MODE_TYPE_ALL)
1633 return MODE_BAD;
1634
1635 if (mode->flags & ~DRM_MODE_FLAG_ALL)
1636 return MODE_BAD;
1637
1638 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1639 return MODE_BAD;
1640
1641 if (mode->clock == 0)
1642 return MODE_CLOCK_LOW;
1643
1644 if (mode->hdisplay == 0 ||
1645 mode->hsync_start < mode->hdisplay ||
1646 mode->hsync_end < mode->hsync_start ||
1647 mode->htotal < mode->hsync_end)
1648 return MODE_H_ILLEGAL;
1649
1650 if (mode->vdisplay == 0 ||
1651 mode->vsync_start < mode->vdisplay ||
1652 mode->vsync_end < mode->vsync_start ||
1653 mode->vtotal < mode->vsync_end)
1654 return MODE_V_ILLEGAL;
1655
1656 return MODE_OK;
1657}
1658
1659/**
1660 * drm_mode_validate_driver - make sure the mode is somewhat sane
1661 * @dev: drm device
1662 * @mode: mode to check
1663 *
1664 * First do basic validation on the mode, and then allow the driver
1665 * to check for device/driver specific limitations via the optional
1666 * &drm_mode_config_helper_funcs.mode_valid hook.
1667 *
1668 * Returns:
1669 * The mode status
1670 */
1671enum drm_mode_status
1672drm_mode_validate_driver(struct drm_device *dev,
1673 const struct drm_display_mode *mode)
1674{
1675 enum drm_mode_status status;
1676
1677 status = drm_mode_validate_basic(mode);
1678 if (status != MODE_OK)
1679 return status;
1680
1681 if (dev->mode_config.funcs->mode_valid)
1682 return dev->mode_config.funcs->mode_valid(dev, mode);
1683 else
1684 return MODE_OK;
1685}
1686EXPORT_SYMBOL(drm_mode_validate_driver);
1687
1688/**
1689 * drm_mode_validate_size - make sure modes adhere to size constraints
1690 * @mode: mode to check
1691 * @maxX: maximum width
1692 * @maxY: maximum height
1693 *
1694 * This function is a helper which can be used to validate modes against size
1695 * limitations of the DRM device/connector. If a mode is too big its status
1696 * member is updated with the appropriate validation failure code. The list
1697 * itself is not changed.
1698 *
1699 * Returns:
1700 * The mode status
1701 */
1702enum drm_mode_status
1703drm_mode_validate_size(const struct drm_display_mode *mode,
1704 int maxX, int maxY)
1705{
1706 if (maxX > 0 && mode->hdisplay > maxX)
1707 return MODE_VIRTUAL_X;
1708
1709 if (maxY > 0 && mode->vdisplay > maxY)
1710 return MODE_VIRTUAL_Y;
1711
1712 return MODE_OK;
1713}
1714EXPORT_SYMBOL(drm_mode_validate_size);
1715
1716/**
1717 * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
1718 * @mode: mode to check
1719 * @connector: drm connector under action
1720 *
1721 * This function is a helper which can be used to filter out any YCBCR420
1722 * only mode, when the source doesn't support it.
1723 *
1724 * Returns:
1725 * The mode status
1726 */
1727enum drm_mode_status
1728drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
1729 struct drm_connector *connector)
1730{
1731 if (!connector->ycbcr_420_allowed &&
1732 drm_mode_is_420_only(&connector->display_info, mode))
1733 return MODE_NO_420;
1734
1735 return MODE_OK;
1736}
1737EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
1738
1739#define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1740
1741static const char * const drm_mode_status_names[] = {
1742 MODE_STATUS(OK),
1743 MODE_STATUS(HSYNC),
1744 MODE_STATUS(VSYNC),
1745 MODE_STATUS(H_ILLEGAL),
1746 MODE_STATUS(V_ILLEGAL),
1747 MODE_STATUS(BAD_WIDTH),
1748 MODE_STATUS(NOMODE),
1749 MODE_STATUS(NO_INTERLACE),
1750 MODE_STATUS(NO_DBLESCAN),
1751 MODE_STATUS(NO_VSCAN),
1752 MODE_STATUS(MEM),
1753 MODE_STATUS(VIRTUAL_X),
1754 MODE_STATUS(VIRTUAL_Y),
1755 MODE_STATUS(MEM_VIRT),
1756 MODE_STATUS(NOCLOCK),
1757 MODE_STATUS(CLOCK_HIGH),
1758 MODE_STATUS(CLOCK_LOW),
1759 MODE_STATUS(CLOCK_RANGE),
1760 MODE_STATUS(BAD_HVALUE),
1761 MODE_STATUS(BAD_VVALUE),
1762 MODE_STATUS(BAD_VSCAN),
1763 MODE_STATUS(HSYNC_NARROW),
1764 MODE_STATUS(HSYNC_WIDE),
1765 MODE_STATUS(HBLANK_NARROW),
1766 MODE_STATUS(HBLANK_WIDE),
1767 MODE_STATUS(VSYNC_NARROW),
1768 MODE_STATUS(VSYNC_WIDE),
1769 MODE_STATUS(VBLANK_NARROW),
1770 MODE_STATUS(VBLANK_WIDE),
1771 MODE_STATUS(PANEL),
1772 MODE_STATUS(INTERLACE_WIDTH),
1773 MODE_STATUS(ONE_WIDTH),
1774 MODE_STATUS(ONE_HEIGHT),
1775 MODE_STATUS(ONE_SIZE),
1776 MODE_STATUS(NO_REDUCED),
1777 MODE_STATUS(NO_STEREO),
1778 MODE_STATUS(NO_420),
1779 MODE_STATUS(STALE),
1780 MODE_STATUS(BAD),
1781 MODE_STATUS(ERROR),
1782};
1783
1784#undef MODE_STATUS
1785
1786const char *drm_get_mode_status_name(enum drm_mode_status status)
1787{
1788 int index = status + 3;
1789
1790 if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1791 return "";
1792
1793 return drm_mode_status_names[index];
1794}
1795
1796/**
1797 * drm_mode_prune_invalid - remove invalid modes from mode list
1798 * @dev: DRM device
1799 * @mode_list: list of modes to check
1800 * @verbose: be verbose about it
1801 *
1802 * This helper function can be used to prune a display mode list after
1803 * validation has been completed. All modes whose status is not MODE_OK will be
1804 * removed from the list, and if @verbose the status code and mode name is also
1805 * printed to dmesg.
1806 */
1807void drm_mode_prune_invalid(struct drm_device *dev,
1808 struct list_head *mode_list, bool verbose)
1809{
1810 struct drm_display_mode *mode, *t;
1811
1812 list_for_each_entry_safe(mode, t, mode_list, head) {
1813 if (mode->status != MODE_OK) {
1814 list_del(&mode->head);
1815 if (mode->type & DRM_MODE_TYPE_USERDEF) {
1816 drm_warn(dev, "User-defined mode not supported: "
1817 DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
1818 }
1819 if (verbose) {
1820 drm_dbg_kms(dev, "Rejected mode: " DRM_MODE_FMT " (%s)\n",
1821 DRM_MODE_ARG(mode), drm_get_mode_status_name(mode->status));
1822 }
1823 drm_mode_destroy(dev, mode);
1824 }
1825 }
1826}
1827EXPORT_SYMBOL(drm_mode_prune_invalid);
1828
1829/**
1830 * drm_mode_compare - compare modes for favorability
1831 * @priv: unused
1832 * @lh_a: list_head for first mode
1833 * @lh_b: list_head for second mode
1834 *
1835 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1836 * which is better.
1837 *
1838 * Returns:
1839 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1840 * positive if @lh_b is better than @lh_a.
1841 */
1842static int drm_mode_compare(void *priv, const struct list_head *lh_a,
1843 const struct list_head *lh_b)
1844{
1845 struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1846 struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1847 int diff;
1848
1849 diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1850 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1851 if (diff)
1852 return diff;
1853 diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1854 if (diff)
1855 return diff;
1856
1857 diff = drm_mode_vrefresh(b) - drm_mode_vrefresh(a);
1858 if (diff)
1859 return diff;
1860
1861 diff = b->clock - a->clock;
1862 return diff;
1863}
1864
1865/**
1866 * drm_mode_sort - sort mode list
1867 * @mode_list: list of drm_display_mode structures to sort
1868 *
1869 * Sort @mode_list by favorability, moving good modes to the head of the list.
1870 */
1871void drm_mode_sort(struct list_head *mode_list)
1872{
1873 list_sort(NULL, mode_list, drm_mode_compare);
1874}
1875EXPORT_SYMBOL(drm_mode_sort);
1876
1877/**
1878 * drm_connector_list_update - update the mode list for the connector
1879 * @connector: the connector to update
1880 *
1881 * This moves the modes from the @connector probed_modes list
1882 * to the actual mode list. It compares the probed mode against the current
1883 * list and only adds different/new modes.
1884 *
1885 * This is just a helper functions doesn't validate any modes itself and also
1886 * doesn't prune any invalid modes. Callers need to do that themselves.
1887 */
1888void drm_connector_list_update(struct drm_connector *connector)
1889{
1890 struct drm_display_mode *pmode, *pt;
1891
1892 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1893
1894 list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1895 struct drm_display_mode *mode;
1896 bool found_it = false;
1897
1898 /* go through current modes checking for the new probed mode */
1899 list_for_each_entry(mode, &connector->modes, head) {
1900 if (!drm_mode_equal(pmode, mode))
1901 continue;
1902
1903 found_it = true;
1904
1905 /*
1906 * If the old matching mode is stale (ie. left over
1907 * from a previous probe) just replace it outright.
1908 * Otherwise just merge the type bits between all
1909 * equal probed modes.
1910 *
1911 * If two probed modes are considered equal, pick the
1912 * actual timings from the one that's marked as
1913 * preferred (in case the match isn't 100%). If
1914 * multiple or zero preferred modes are present, favor
1915 * the mode added to the probed_modes list first.
1916 */
1917 if (mode->status == MODE_STALE) {
1918 drm_mode_copy(mode, pmode);
1919 } else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1920 (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1921 pmode->type |= mode->type;
1922 drm_mode_copy(mode, pmode);
1923 } else {
1924 mode->type |= pmode->type;
1925 }
1926
1927 list_del(&pmode->head);
1928 drm_mode_destroy(connector->dev, pmode);
1929 break;
1930 }
1931
1932 if (!found_it) {
1933 list_move_tail(&pmode->head, &connector->modes);
1934 }
1935 }
1936}
1937EXPORT_SYMBOL(drm_connector_list_update);
1938
1939static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
1940 struct drm_cmdline_mode *mode)
1941{
1942 unsigned int bpp;
1943
1944 if (str[0] != '-')
1945 return -EINVAL;
1946
1947 str++;
1948 bpp = simple_strtol(str, end_ptr, 10);
1949 if (*end_ptr == str)
1950 return -EINVAL;
1951
1952 mode->bpp = bpp;
1953 mode->bpp_specified = true;
1954
1955 return 0;
1956}
1957
1958static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
1959 struct drm_cmdline_mode *mode)
1960{
1961 unsigned int refresh;
1962
1963 if (str[0] != '@')
1964 return -EINVAL;
1965
1966 str++;
1967 refresh = simple_strtol(str, end_ptr, 10);
1968 if (*end_ptr == str)
1969 return -EINVAL;
1970
1971 mode->refresh = refresh;
1972 mode->refresh_specified = true;
1973
1974 return 0;
1975}
1976
1977static int drm_mode_parse_cmdline_extra(const char *str, int length,
1978 bool freestanding,
1979 const struct drm_connector *connector,
1980 struct drm_cmdline_mode *mode)
1981{
1982 int i;
1983
1984 for (i = 0; i < length; i++) {
1985 switch (str[i]) {
1986 case 'i':
1987 if (freestanding)
1988 return -EINVAL;
1989
1990 mode->interlace = true;
1991 break;
1992 case 'm':
1993 if (freestanding)
1994 return -EINVAL;
1995
1996 mode->margins = true;
1997 break;
1998 case 'D':
1999 if (mode->force != DRM_FORCE_UNSPECIFIED)
2000 return -EINVAL;
2001
2002 if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
2003 (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
2004 mode->force = DRM_FORCE_ON;
2005 else
2006 mode->force = DRM_FORCE_ON_DIGITAL;
2007 break;
2008 case 'd':
2009 if (mode->force != DRM_FORCE_UNSPECIFIED)
2010 return -EINVAL;
2011
2012 mode->force = DRM_FORCE_OFF;
2013 break;
2014 case 'e':
2015 if (mode->force != DRM_FORCE_UNSPECIFIED)
2016 return -EINVAL;
2017
2018 mode->force = DRM_FORCE_ON;
2019 break;
2020 default:
2021 return -EINVAL;
2022 }
2023 }
2024
2025 return 0;
2026}
2027
2028static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
2029 bool extras,
2030 const struct drm_connector *connector,
2031 struct drm_cmdline_mode *mode)
2032{
2033 const char *str_start = str;
2034 bool rb = false, cvt = false;
2035 int xres = 0, yres = 0;
2036 int remaining, i;
2037 char *end_ptr;
2038
2039 xres = simple_strtol(str, &end_ptr, 10);
2040 if (end_ptr == str)
2041 return -EINVAL;
2042
2043 if (end_ptr[0] != 'x')
2044 return -EINVAL;
2045 end_ptr++;
2046
2047 str = end_ptr;
2048 yres = simple_strtol(str, &end_ptr, 10);
2049 if (end_ptr == str)
2050 return -EINVAL;
2051
2052 remaining = length - (end_ptr - str_start);
2053 if (remaining < 0)
2054 return -EINVAL;
2055
2056 for (i = 0; i < remaining; i++) {
2057 switch (end_ptr[i]) {
2058 case 'M':
2059 cvt = true;
2060 break;
2061 case 'R':
2062 rb = true;
2063 break;
2064 default:
2065 /*
2066 * Try to pass that to our extras parsing
2067 * function to handle the case where the
2068 * extras are directly after the resolution
2069 */
2070 if (extras) {
2071 int ret = drm_mode_parse_cmdline_extra(end_ptr + i,
2072 1,
2073 false,
2074 connector,
2075 mode);
2076 if (ret)
2077 return ret;
2078 } else {
2079 return -EINVAL;
2080 }
2081 }
2082 }
2083
2084 mode->xres = xres;
2085 mode->yres = yres;
2086 mode->cvt = cvt;
2087 mode->rb = rb;
2088
2089 return 0;
2090}
2091
2092static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret)
2093{
2094 const char *value;
2095 char *endp;
2096
2097 /*
2098 * delim must point to the '=', otherwise it is a syntax error and
2099 * if delim points to the terminating zero, then delim + 1 will point
2100 * past the end of the string.
2101 */
2102 if (*delim != '=')
2103 return -EINVAL;
2104
2105 value = delim + 1;
2106 *int_ret = simple_strtol(value, &endp, 10);
2107
2108 /* Make sure we have parsed something */
2109 if (endp == value)
2110 return -EINVAL;
2111
2112 return 0;
2113}
2114
2115static int drm_mode_parse_panel_orientation(const char *delim,
2116 struct drm_cmdline_mode *mode)
2117{
2118 const char *value;
2119
2120 if (*delim != '=')
2121 return -EINVAL;
2122
2123 value = delim + 1;
2124 delim = strchr(value, ',');
2125 if (!delim)
2126 delim = value + strlen(value);
2127
2128 if (!strncmp(value, "normal", delim - value))
2129 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
2130 else if (!strncmp(value, "upside_down", delim - value))
2131 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
2132 else if (!strncmp(value, "left_side_up", delim - value))
2133 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
2134 else if (!strncmp(value, "right_side_up", delim - value))
2135 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
2136 else
2137 return -EINVAL;
2138
2139 return 0;
2140}
2141
2142static int drm_mode_parse_tv_mode(const char *delim,
2143 struct drm_cmdline_mode *mode)
2144{
2145 const char *value;
2146 int ret;
2147
2148 if (*delim != '=')
2149 return -EINVAL;
2150
2151 value = delim + 1;
2152 delim = strchr(value, ',');
2153 if (!delim)
2154 delim = value + strlen(value);
2155
2156 ret = drm_get_tv_mode_from_name(value, delim - value);
2157 if (ret < 0)
2158 return ret;
2159
2160 mode->tv_mode_specified = true;
2161 mode->tv_mode = ret;
2162
2163 return 0;
2164}
2165
2166static int drm_mode_parse_cmdline_options(const char *str,
2167 bool freestanding,
2168 const struct drm_connector *connector,
2169 struct drm_cmdline_mode *mode)
2170{
2171 unsigned int deg, margin, rotation = 0;
2172 const char *delim, *option, *sep;
2173
2174 option = str;
2175 do {
2176 delim = strchr(option, '=');
2177 if (!delim) {
2178 delim = strchr(option, ',');
2179
2180 if (!delim)
2181 delim = option + strlen(option);
2182 }
2183
2184 if (!strncmp(option, "rotate", delim - option)) {
2185 if (drm_mode_parse_cmdline_int(delim, °))
2186 return -EINVAL;
2187
2188 switch (deg) {
2189 case 0:
2190 rotation |= DRM_MODE_ROTATE_0;
2191 break;
2192
2193 case 90:
2194 rotation |= DRM_MODE_ROTATE_90;
2195 break;
2196
2197 case 180:
2198 rotation |= DRM_MODE_ROTATE_180;
2199 break;
2200
2201 case 270:
2202 rotation |= DRM_MODE_ROTATE_270;
2203 break;
2204
2205 default:
2206 return -EINVAL;
2207 }
2208 } else if (!strncmp(option, "reflect_x", delim - option)) {
2209 rotation |= DRM_MODE_REFLECT_X;
2210 } else if (!strncmp(option, "reflect_y", delim - option)) {
2211 rotation |= DRM_MODE_REFLECT_Y;
2212 } else if (!strncmp(option, "margin_right", delim - option)) {
2213 if (drm_mode_parse_cmdline_int(delim, &margin))
2214 return -EINVAL;
2215
2216 mode->tv_margins.right = margin;
2217 } else if (!strncmp(option, "margin_left", delim - option)) {
2218 if (drm_mode_parse_cmdline_int(delim, &margin))
2219 return -EINVAL;
2220
2221 mode->tv_margins.left = margin;
2222 } else if (!strncmp(option, "margin_top", delim - option)) {
2223 if (drm_mode_parse_cmdline_int(delim, &margin))
2224 return -EINVAL;
2225
2226 mode->tv_margins.top = margin;
2227 } else if (!strncmp(option, "margin_bottom", delim - option)) {
2228 if (drm_mode_parse_cmdline_int(delim, &margin))
2229 return -EINVAL;
2230
2231 mode->tv_margins.bottom = margin;
2232 } else if (!strncmp(option, "panel_orientation", delim - option)) {
2233 if (drm_mode_parse_panel_orientation(delim, mode))
2234 return -EINVAL;
2235 } else if (!strncmp(option, "tv_mode", delim - option)) {
2236 if (drm_mode_parse_tv_mode(delim, mode))
2237 return -EINVAL;
2238 } else {
2239 return -EINVAL;
2240 }
2241 sep = strchr(delim, ',');
2242 option = sep + 1;
2243 } while (sep);
2244
2245 if (rotation && freestanding)
2246 return -EINVAL;
2247
2248 if (!(rotation & DRM_MODE_ROTATE_MASK))
2249 rotation |= DRM_MODE_ROTATE_0;
2250
2251 /* Make sure there is exactly one rotation defined */
2252 if (!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK))
2253 return -EINVAL;
2254
2255 mode->rotation_reflection = rotation;
2256
2257 return 0;
2258}
2259
2260struct drm_named_mode {
2261 const char *name;
2262 unsigned int pixel_clock_khz;
2263 unsigned int xres;
2264 unsigned int yres;
2265 unsigned int flags;
2266 unsigned int tv_mode;
2267};
2268
2269#define NAMED_MODE(_name, _pclk, _x, _y, _flags, _mode) \
2270 { \
2271 .name = _name, \
2272 .pixel_clock_khz = _pclk, \
2273 .xres = _x, \
2274 .yres = _y, \
2275 .flags = _flags, \
2276 .tv_mode = _mode, \
2277 }
2278
2279static const struct drm_named_mode drm_named_modes[] = {
2280 NAMED_MODE("NTSC", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC),
2281 NAMED_MODE("NTSC-J", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC_J),
2282 NAMED_MODE("PAL", 13500, 720, 576, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL),
2283 NAMED_MODE("PAL-M", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL_M),
2284};
2285
2286static int drm_mode_parse_cmdline_named_mode(const char *name,
2287 unsigned int name_end,
2288 struct drm_cmdline_mode *cmdline_mode)
2289{
2290 unsigned int i;
2291
2292 if (!name_end)
2293 return 0;
2294
2295 /* If the name starts with a digit, it's not a named mode */
2296 if (isdigit(name[0]))
2297 return 0;
2298
2299 /*
2300 * If there's an equal sign in the name, the command-line
2301 * contains only an option and no mode.
2302 */
2303 if (strnchr(name, name_end, '='))
2304 return 0;
2305
2306 /* The connection status extras can be set without a mode. */
2307 if (name_end == 1 &&
2308 (name[0] == 'd' || name[0] == 'D' || name[0] == 'e'))
2309 return 0;
2310
2311 /*
2312 * We're sure we're a named mode at this point, iterate over the
2313 * list of modes we're aware of.
2314 */
2315 for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
2316 const struct drm_named_mode *mode = &drm_named_modes[i];
2317 int ret;
2318
2319 ret = str_has_prefix(name, mode->name);
2320 if (ret != name_end)
2321 continue;
2322
2323 strscpy(cmdline_mode->name, mode->name, sizeof(cmdline_mode->name));
2324 cmdline_mode->pixel_clock = mode->pixel_clock_khz;
2325 cmdline_mode->xres = mode->xres;
2326 cmdline_mode->yres = mode->yres;
2327 cmdline_mode->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
2328 cmdline_mode->tv_mode = mode->tv_mode;
2329 cmdline_mode->tv_mode_specified = true;
2330 cmdline_mode->specified = true;
2331
2332 return 1;
2333 }
2334
2335 return -EINVAL;
2336}
2337
2338/**
2339 * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
2340 * @mode_option: optional per connector mode option
2341 * @connector: connector to parse modeline for
2342 * @mode: preallocated drm_cmdline_mode structure to fill out
2343 *
2344 * This parses @mode_option command line modeline for modes and options to
2345 * configure the connector.
2346 *
2347 * This uses the same parameters as the fb modedb.c, except for an extra
2348 * force-enable, force-enable-digital and force-disable bit at the end::
2349 *
2350 * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
2351 *
2352 * Additionals options can be provided following the mode, using a comma to
2353 * separate each option. Valid options can be found in
2354 * Documentation/fb/modedb.rst.
2355 *
2356 * The intermediate drm_cmdline_mode structure is required to store additional
2357 * options from the command line modline like the force-enable/disable flag.
2358 *
2359 * Returns:
2360 * True if a valid modeline has been parsed, false otherwise.
2361 */
2362bool drm_mode_parse_command_line_for_connector(const char *mode_option,
2363 const struct drm_connector *connector,
2364 struct drm_cmdline_mode *mode)
2365{
2366 const char *name;
2367 bool freestanding = false, parse_extras = false;
2368 unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
2369 unsigned int mode_end = 0;
2370 const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
2371 const char *options_ptr = NULL;
2372 char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
2373 int len, ret;
2374
2375 memset(mode, 0, sizeof(*mode));
2376 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
2377
2378 if (!mode_option)
2379 return false;
2380
2381 name = mode_option;
2382
2383 /* Locate the start of named options */
2384 options_ptr = strchr(name, ',');
2385 if (options_ptr)
2386 options_off = options_ptr - name;
2387 else
2388 options_off = strlen(name);
2389
2390 /* Try to locate the bpp and refresh specifiers, if any */
2391 bpp_ptr = strnchr(name, options_off, '-');
2392 while (bpp_ptr && !isdigit(bpp_ptr[1]))
2393 bpp_ptr = strnchr(bpp_ptr + 1, options_off, '-');
2394 if (bpp_ptr)
2395 bpp_off = bpp_ptr - name;
2396
2397 refresh_ptr = strnchr(name, options_off, '@');
2398 if (refresh_ptr)
2399 refresh_off = refresh_ptr - name;
2400
2401 /* Locate the end of the name / resolution, and parse it */
2402 if (bpp_ptr) {
2403 mode_end = bpp_off;
2404 } else if (refresh_ptr) {
2405 mode_end = refresh_off;
2406 } else if (options_ptr) {
2407 mode_end = options_off;
2408 parse_extras = true;
2409 } else {
2410 mode_end = strlen(name);
2411 parse_extras = true;
2412 }
2413
2414 if (!mode_end)
2415 return false;
2416
2417 ret = drm_mode_parse_cmdline_named_mode(name, mode_end, mode);
2418 if (ret < 0)
2419 return false;
2420
2421 /*
2422 * Having a mode that starts by a letter (and thus is named) and
2423 * an at-sign (used to specify a refresh rate) is disallowed.
2424 */
2425 if (ret && refresh_ptr)
2426 return false;
2427
2428 /* No named mode? Check for a normal mode argument, e.g. 1024x768 */
2429 if (!mode->specified && isdigit(name[0])) {
2430 ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
2431 parse_extras,
2432 connector,
2433 mode);
2434 if (ret)
2435 return false;
2436
2437 mode->specified = true;
2438 }
2439
2440 /* No mode? Check for freestanding extras and/or options */
2441 if (!mode->specified) {
2442 unsigned int len = strlen(mode_option);
2443
2444 if (bpp_ptr || refresh_ptr)
2445 return false; /* syntax error */
2446
2447 if (len == 1 || (len >= 2 && mode_option[1] == ','))
2448 extra_ptr = mode_option;
2449 else
2450 options_ptr = mode_option - 1;
2451
2452 freestanding = true;
2453 }
2454
2455 if (bpp_ptr) {
2456 ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode);
2457 if (ret)
2458 return false;
2459
2460 mode->bpp_specified = true;
2461 }
2462
2463 if (refresh_ptr) {
2464 ret = drm_mode_parse_cmdline_refresh(refresh_ptr,
2465 &refresh_end_ptr, mode);
2466 if (ret)
2467 return false;
2468
2469 mode->refresh_specified = true;
2470 }
2471
2472 /*
2473 * Locate the end of the bpp / refresh, and parse the extras
2474 * if relevant
2475 */
2476 if (bpp_ptr && refresh_ptr)
2477 extra_ptr = max(bpp_end_ptr, refresh_end_ptr);
2478 else if (bpp_ptr)
2479 extra_ptr = bpp_end_ptr;
2480 else if (refresh_ptr)
2481 extra_ptr = refresh_end_ptr;
2482
2483 if (extra_ptr) {
2484 if (options_ptr)
2485 len = options_ptr - extra_ptr;
2486 else
2487 len = strlen(extra_ptr);
2488
2489 ret = drm_mode_parse_cmdline_extra(extra_ptr, len, freestanding,
2490 connector, mode);
2491 if (ret)
2492 return false;
2493 }
2494
2495 if (options_ptr) {
2496 ret = drm_mode_parse_cmdline_options(options_ptr + 1,
2497 freestanding,
2498 connector, mode);
2499 if (ret)
2500 return false;
2501 }
2502
2503 return true;
2504}
2505EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
2506
2507static struct drm_display_mode *drm_named_mode(struct drm_device *dev,
2508 struct drm_cmdline_mode *cmd)
2509{
2510 unsigned int i;
2511
2512 for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
2513 const struct drm_named_mode *named_mode = &drm_named_modes[i];
2514
2515 if (strcmp(cmd->name, named_mode->name))
2516 continue;
2517
2518 if (!cmd->tv_mode_specified)
2519 continue;
2520
2521 return drm_analog_tv_mode(dev,
2522 named_mode->tv_mode,
2523 named_mode->pixel_clock_khz * 1000,
2524 named_mode->xres,
2525 named_mode->yres,
2526 named_mode->flags & DRM_MODE_FLAG_INTERLACE);
2527 }
2528
2529 return NULL;
2530}
2531
2532/**
2533 * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
2534 * @dev: DRM device to create the new mode for
2535 * @cmd: input command line modeline
2536 *
2537 * Returns:
2538 * Pointer to converted mode on success, NULL on error.
2539 */
2540struct drm_display_mode *
2541drm_mode_create_from_cmdline_mode(struct drm_device *dev,
2542 struct drm_cmdline_mode *cmd)
2543{
2544 struct drm_display_mode *mode;
2545
2546 if (cmd->xres == 0 || cmd->yres == 0)
2547 return NULL;
2548
2549 if (strlen(cmd->name))
2550 mode = drm_named_mode(dev, cmd);
2551 else if (cmd->cvt)
2552 mode = drm_cvt_mode(dev,
2553 cmd->xres, cmd->yres,
2554 cmd->refresh_specified ? cmd->refresh : 60,
2555 cmd->rb, cmd->interlace,
2556 cmd->margins);
2557 else
2558 mode = drm_gtf_mode(dev,
2559 cmd->xres, cmd->yres,
2560 cmd->refresh_specified ? cmd->refresh : 60,
2561 cmd->interlace,
2562 cmd->margins);
2563 if (!mode)
2564 return NULL;
2565
2566 mode->type |= DRM_MODE_TYPE_USERDEF;
2567 /* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
2568 if (cmd->xres == 1366)
2569 drm_mode_fixup_1366x768(mode);
2570 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
2571 return mode;
2572}
2573EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
2574
2575/**
2576 * drm_mode_convert_to_umode - convert a drm_display_mode into a modeinfo
2577 * @out: drm_mode_modeinfo struct to return to the user
2578 * @in: drm_display_mode to use
2579 *
2580 * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
2581 * the user.
2582 */
2583void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
2584 const struct drm_display_mode *in)
2585{
2586 out->clock = in->clock;
2587 out->hdisplay = in->hdisplay;
2588 out->hsync_start = in->hsync_start;
2589 out->hsync_end = in->hsync_end;
2590 out->htotal = in->htotal;
2591 out->hskew = in->hskew;
2592 out->vdisplay = in->vdisplay;
2593 out->vsync_start = in->vsync_start;
2594 out->vsync_end = in->vsync_end;
2595 out->vtotal = in->vtotal;
2596 out->vscan = in->vscan;
2597 out->vrefresh = drm_mode_vrefresh(in);
2598 out->flags = in->flags;
2599 out->type = in->type;
2600
2601 switch (in->picture_aspect_ratio) {
2602 case HDMI_PICTURE_ASPECT_4_3:
2603 out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
2604 break;
2605 case HDMI_PICTURE_ASPECT_16_9:
2606 out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
2607 break;
2608 case HDMI_PICTURE_ASPECT_64_27:
2609 out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
2610 break;
2611 case HDMI_PICTURE_ASPECT_256_135:
2612 out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
2613 break;
2614 default:
2615 WARN(1, "Invalid aspect ratio (0%x) on mode\n",
2616 in->picture_aspect_ratio);
2617 fallthrough;
2618 case HDMI_PICTURE_ASPECT_NONE:
2619 out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
2620 break;
2621 }
2622
2623 strscpy_pad(out->name, in->name, sizeof(out->name));
2624}
2625
2626/**
2627 * drm_mode_convert_umode - convert a modeinfo into a drm_display_mode
2628 * @dev: drm device
2629 * @out: drm_display_mode to return to the user
2630 * @in: drm_mode_modeinfo to use
2631 *
2632 * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
2633 * the caller.
2634 *
2635 * Returns:
2636 * Zero on success, negative errno on failure.
2637 */
2638int drm_mode_convert_umode(struct drm_device *dev,
2639 struct drm_display_mode *out,
2640 const struct drm_mode_modeinfo *in)
2641{
2642 if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
2643 return -ERANGE;
2644
2645 out->clock = in->clock;
2646 out->hdisplay = in->hdisplay;
2647 out->hsync_start = in->hsync_start;
2648 out->hsync_end = in->hsync_end;
2649 out->htotal = in->htotal;
2650 out->hskew = in->hskew;
2651 out->vdisplay = in->vdisplay;
2652 out->vsync_start = in->vsync_start;
2653 out->vsync_end = in->vsync_end;
2654 out->vtotal = in->vtotal;
2655 out->vscan = in->vscan;
2656 out->flags = in->flags;
2657 /*
2658 * Old xf86-video-vmware (possibly others too) used to
2659 * leave 'type' uninitialized. Just ignore any bits we
2660 * don't like. It's a just hint after all, and more
2661 * useful for the kernel->userspace direction anyway.
2662 */
2663 out->type = in->type & DRM_MODE_TYPE_ALL;
2664 strscpy_pad(out->name, in->name, sizeof(out->name));
2665
2666 /* Clearing picture aspect ratio bits from out flags,
2667 * as the aspect-ratio information is not stored in
2668 * flags for kernel-mode, but in picture_aspect_ratio.
2669 */
2670 out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
2671
2672 switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
2673 case DRM_MODE_FLAG_PIC_AR_4_3:
2674 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
2675 break;
2676 case DRM_MODE_FLAG_PIC_AR_16_9:
2677 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
2678 break;
2679 case DRM_MODE_FLAG_PIC_AR_64_27:
2680 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27;
2681 break;
2682 case DRM_MODE_FLAG_PIC_AR_256_135:
2683 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_256_135;
2684 break;
2685 case DRM_MODE_FLAG_PIC_AR_NONE:
2686 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
2687 break;
2688 default:
2689 return -EINVAL;
2690 }
2691
2692 out->status = drm_mode_validate_driver(dev, out);
2693 if (out->status != MODE_OK)
2694 return -EINVAL;
2695
2696 drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
2697
2698 return 0;
2699}
2700
2701/**
2702 * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
2703 * output format
2704 *
2705 * @display: display under action
2706 * @mode: video mode to be tested.
2707 *
2708 * Returns:
2709 * true if the mode can be supported in YCBCR420 format
2710 * false if not.
2711 */
2712bool drm_mode_is_420_only(const struct drm_display_info *display,
2713 const struct drm_display_mode *mode)
2714{
2715 u8 vic = drm_match_cea_mode(mode);
2716
2717 return test_bit(vic, display->hdmi.y420_vdb_modes);
2718}
2719EXPORT_SYMBOL(drm_mode_is_420_only);
2720
2721/**
2722 * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
2723 * output format also (along with RGB/YCBCR444/422)
2724 *
2725 * @display: display under action.
2726 * @mode: video mode to be tested.
2727 *
2728 * Returns:
2729 * true if the mode can be support YCBCR420 format
2730 * false if not.
2731 */
2732bool drm_mode_is_420_also(const struct drm_display_info *display,
2733 const struct drm_display_mode *mode)
2734{
2735 u8 vic = drm_match_cea_mode(mode);
2736
2737 return test_bit(vic, display->hdmi.y420_cmdb_modes);
2738}
2739EXPORT_SYMBOL(drm_mode_is_420_also);
2740/**
2741 * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
2742 * output format
2743 *
2744 * @display: display under action.
2745 * @mode: video mode to be tested.
2746 *
2747 * Returns:
2748 * true if the mode can be supported in YCBCR420 format
2749 * false if not.
2750 */
2751bool drm_mode_is_420(const struct drm_display_info *display,
2752 const struct drm_display_mode *mode)
2753{
2754 return drm_mode_is_420_only(display, mode) ||
2755 drm_mode_is_420_also(display, mode);
2756}
2757EXPORT_SYMBOL(drm_mode_is_420);
2758
2759/**
2760 * drm_set_preferred_mode - Sets the preferred mode of a connector
2761 * @connector: connector whose mode list should be processed
2762 * @hpref: horizontal resolution of preferred mode
2763 * @vpref: vertical resolution of preferred mode
2764 *
2765 * Marks a mode as preferred if it matches the resolution specified by @hpref
2766 * and @vpref.
2767 */
2768void drm_set_preferred_mode(struct drm_connector *connector,
2769 int hpref, int vpref)
2770{
2771 struct drm_display_mode *mode;
2772
2773 list_for_each_entry(mode, &connector->probed_modes, head) {
2774 if (mode->hdisplay == hpref &&
2775 mode->vdisplay == vpref)
2776 mode->type |= DRM_MODE_TYPE_PREFERRED;
2777 }
2778}
2779EXPORT_SYMBOL(drm_set_preferred_mode);