Loading...
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/list.h>
34#include <linux/list_sort.h>
35#include <linux/export.h>
36#include <drm/drmP.h>
37#include <drm/drm_crtc.h>
38#include <video/of_videomode.h>
39#include <video/videomode.h>
40#include <drm/drm_modes.h>
41
42#include "drm_crtc_internal.h"
43
44/**
45 * drm_mode_debug_printmodeline - print a mode to dmesg
46 * @mode: mode to print
47 *
48 * Describe @mode using DRM_DEBUG.
49 */
50void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
51{
52 DRM_DEBUG_KMS("Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d "
53 "0x%x 0x%x\n",
54 mode->base.id, mode->name, mode->vrefresh, mode->clock,
55 mode->hdisplay, mode->hsync_start,
56 mode->hsync_end, mode->htotal,
57 mode->vdisplay, mode->vsync_start,
58 mode->vsync_end, mode->vtotal, mode->type, mode->flags);
59}
60EXPORT_SYMBOL(drm_mode_debug_printmodeline);
61
62/**
63 * drm_mode_create - create a new display mode
64 * @dev: DRM device
65 *
66 * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
67 * and return it.
68 *
69 * Returns:
70 * Pointer to new mode on success, NULL on error.
71 */
72struct drm_display_mode *drm_mode_create(struct drm_device *dev)
73{
74 struct drm_display_mode *nmode;
75
76 nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
77 if (!nmode)
78 return NULL;
79
80 if (drm_mode_object_get(dev, &nmode->base, DRM_MODE_OBJECT_MODE)) {
81 kfree(nmode);
82 return NULL;
83 }
84
85 return nmode;
86}
87EXPORT_SYMBOL(drm_mode_create);
88
89/**
90 * drm_mode_destroy - remove a mode
91 * @dev: DRM device
92 * @mode: mode to remove
93 *
94 * Release @mode's unique ID, then free it @mode structure itself using kfree.
95 */
96void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
97{
98 if (!mode)
99 return;
100
101 drm_mode_object_put(dev, &mode->base);
102
103 kfree(mode);
104}
105EXPORT_SYMBOL(drm_mode_destroy);
106
107/**
108 * drm_mode_probed_add - add a mode to a connector's probed_mode list
109 * @connector: connector the new mode
110 * @mode: mode data
111 *
112 * Add @mode to @connector's probed_mode list for later use. This list should
113 * then in a second step get filtered and all the modes actually supported by
114 * the hardware moved to the @connector's modes list.
115 */
116void drm_mode_probed_add(struct drm_connector *connector,
117 struct drm_display_mode *mode)
118{
119 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
120
121 list_add_tail(&mode->head, &connector->probed_modes);
122}
123EXPORT_SYMBOL(drm_mode_probed_add);
124
125/**
126 * drm_cvt_mode -create a modeline based on the CVT algorithm
127 * @dev: drm device
128 * @hdisplay: hdisplay size
129 * @vdisplay: vdisplay size
130 * @vrefresh: vrefresh rate
131 * @reduced: whether to use reduced blanking
132 * @interlaced: whether to compute an interlaced mode
133 * @margins: whether to add margins (borders)
134 *
135 * This function is called to generate the modeline based on CVT algorithm
136 * according to the hdisplay, vdisplay, vrefresh.
137 * It is based from the VESA(TM) Coordinated Video Timing Generator by
138 * Graham Loveridge April 9, 2003 available at
139 * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
140 *
141 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
142 * What I have done is to translate it by using integer calculation.
143 *
144 * Returns:
145 * The modeline based on the CVT algorithm stored in a drm_display_mode object.
146 * The display mode object is allocated with drm_mode_create(). Returns NULL
147 * when no mode could be allocated.
148 */
149struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
150 int vdisplay, int vrefresh,
151 bool reduced, bool interlaced, bool margins)
152{
153#define HV_FACTOR 1000
154 /* 1) top/bottom margin size (% of height) - default: 1.8, */
155#define CVT_MARGIN_PERCENTAGE 18
156 /* 2) character cell horizontal granularity (pixels) - default 8 */
157#define CVT_H_GRANULARITY 8
158 /* 3) Minimum vertical porch (lines) - default 3 */
159#define CVT_MIN_V_PORCH 3
160 /* 4) Minimum number of vertical back porch lines - default 6 */
161#define CVT_MIN_V_BPORCH 6
162 /* Pixel Clock step (kHz) */
163#define CVT_CLOCK_STEP 250
164 struct drm_display_mode *drm_mode;
165 unsigned int vfieldrate, hperiod;
166 int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
167 int interlace;
168
169 /* allocate the drm_display_mode structure. If failure, we will
170 * return directly
171 */
172 drm_mode = drm_mode_create(dev);
173 if (!drm_mode)
174 return NULL;
175
176 /* the CVT default refresh rate is 60Hz */
177 if (!vrefresh)
178 vrefresh = 60;
179
180 /* the required field fresh rate */
181 if (interlaced)
182 vfieldrate = vrefresh * 2;
183 else
184 vfieldrate = vrefresh;
185
186 /* horizontal pixels */
187 hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
188
189 /* determine the left&right borders */
190 hmargin = 0;
191 if (margins) {
192 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
193 hmargin -= hmargin % CVT_H_GRANULARITY;
194 }
195 /* find the total active pixels */
196 drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
197
198 /* find the number of lines per field */
199 if (interlaced)
200 vdisplay_rnd = vdisplay / 2;
201 else
202 vdisplay_rnd = vdisplay;
203
204 /* find the top & bottom borders */
205 vmargin = 0;
206 if (margins)
207 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
208
209 drm_mode->vdisplay = vdisplay + 2 * vmargin;
210
211 /* Interlaced */
212 if (interlaced)
213 interlace = 1;
214 else
215 interlace = 0;
216
217 /* Determine VSync Width from aspect ratio */
218 if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
219 vsync = 4;
220 else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
221 vsync = 5;
222 else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
223 vsync = 6;
224 else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
225 vsync = 7;
226 else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
227 vsync = 7;
228 else /* custom */
229 vsync = 10;
230
231 if (!reduced) {
232 /* simplify the GTF calculation */
233 /* 4) Minimum time of vertical sync + back porch interval (µs)
234 * default 550.0
235 */
236 int tmp1, tmp2;
237#define CVT_MIN_VSYNC_BP 550
238 /* 3) Nominal HSync width (% of line period) - default 8 */
239#define CVT_HSYNC_PERCENTAGE 8
240 unsigned int hblank_percentage;
241 int vsyncandback_porch, vback_porch, hblank;
242
243 /* estimated the horizontal period */
244 tmp1 = HV_FACTOR * 1000000 -
245 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
246 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
247 interlace;
248 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
249
250 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
251 /* 9. Find number of lines in sync + backporch */
252 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
253 vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
254 else
255 vsyncandback_porch = tmp1;
256 /* 10. Find number of lines in back porch */
257 vback_porch = vsyncandback_porch - vsync;
258 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
259 vsyncandback_porch + CVT_MIN_V_PORCH;
260 /* 5) Definition of Horizontal blanking time limitation */
261 /* Gradient (%/kHz) - default 600 */
262#define CVT_M_FACTOR 600
263 /* Offset (%) - default 40 */
264#define CVT_C_FACTOR 40
265 /* Blanking time scaling factor - default 128 */
266#define CVT_K_FACTOR 128
267 /* Scaling factor weighting - default 20 */
268#define CVT_J_FACTOR 20
269#define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256)
270#define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
271 CVT_J_FACTOR)
272 /* 12. Find ideal blanking duty cycle from formula */
273 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
274 hperiod / 1000;
275 /* 13. Blanking time */
276 if (hblank_percentage < 20 * HV_FACTOR)
277 hblank_percentage = 20 * HV_FACTOR;
278 hblank = drm_mode->hdisplay * hblank_percentage /
279 (100 * HV_FACTOR - hblank_percentage);
280 hblank -= hblank % (2 * CVT_H_GRANULARITY);
281 /* 14. find the total pixels per line */
282 drm_mode->htotal = drm_mode->hdisplay + hblank;
283 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
284 drm_mode->hsync_start = drm_mode->hsync_end -
285 (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
286 drm_mode->hsync_start += CVT_H_GRANULARITY -
287 drm_mode->hsync_start % CVT_H_GRANULARITY;
288 /* fill the Vsync values */
289 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
290 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
291 } else {
292 /* Reduced blanking */
293 /* Minimum vertical blanking interval time (µs)- default 460 */
294#define CVT_RB_MIN_VBLANK 460
295 /* Fixed number of clocks for horizontal sync */
296#define CVT_RB_H_SYNC 32
297 /* Fixed number of clocks for horizontal blanking */
298#define CVT_RB_H_BLANK 160
299 /* Fixed number of lines for vertical front porch - default 3*/
300#define CVT_RB_VFPORCH 3
301 int vbilines;
302 int tmp1, tmp2;
303 /* 8. Estimate Horizontal period. */
304 tmp1 = HV_FACTOR * 1000000 -
305 CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
306 tmp2 = vdisplay_rnd + 2 * vmargin;
307 hperiod = tmp1 / (tmp2 * vfieldrate);
308 /* 9. Find number of lines in vertical blanking */
309 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
310 /* 10. Check if vertical blanking is sufficient */
311 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
312 vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
313 /* 11. Find total number of lines in vertical field */
314 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
315 /* 12. Find total number of pixels in a line */
316 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
317 /* Fill in HSync values */
318 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
319 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
320 /* Fill in VSync values */
321 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
322 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
323 }
324 /* 15/13. Find pixel clock frequency (kHz for xf86) */
325 drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;
326 drm_mode->clock -= drm_mode->clock % CVT_CLOCK_STEP;
327 /* 18/16. Find actual vertical frame frequency */
328 /* ignore - just set the mode flag for interlaced */
329 if (interlaced) {
330 drm_mode->vtotal *= 2;
331 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
332 }
333 /* Fill the mode line name */
334 drm_mode_set_name(drm_mode);
335 if (reduced)
336 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
337 DRM_MODE_FLAG_NVSYNC);
338 else
339 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
340 DRM_MODE_FLAG_NHSYNC);
341
342 return drm_mode;
343}
344EXPORT_SYMBOL(drm_cvt_mode);
345
346/**
347 * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
348 * @dev: drm device
349 * @hdisplay: hdisplay size
350 * @vdisplay: vdisplay size
351 * @vrefresh: vrefresh rate.
352 * @interlaced: whether to compute an interlaced mode
353 * @margins: desired margin (borders) size
354 * @GTF_M: extended GTF formula parameters
355 * @GTF_2C: extended GTF formula parameters
356 * @GTF_K: extended GTF formula parameters
357 * @GTF_2J: extended GTF formula parameters
358 *
359 * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
360 * in here multiplied by two. For a C of 40, pass in 80.
361 *
362 * Returns:
363 * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
364 * The display mode object is allocated with drm_mode_create(). Returns NULL
365 * when no mode could be allocated.
366 */
367struct drm_display_mode *
368drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
369 int vrefresh, bool interlaced, int margins,
370 int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
371{ /* 1) top/bottom margin size (% of height) - default: 1.8, */
372#define GTF_MARGIN_PERCENTAGE 18
373 /* 2) character cell horizontal granularity (pixels) - default 8 */
374#define GTF_CELL_GRAN 8
375 /* 3) Minimum vertical porch (lines) - default 3 */
376#define GTF_MIN_V_PORCH 1
377 /* width of vsync in lines */
378#define V_SYNC_RQD 3
379 /* width of hsync as % of total line */
380#define H_SYNC_PERCENT 8
381 /* min time of vsync + back porch (microsec) */
382#define MIN_VSYNC_PLUS_BP 550
383 /* C' and M' are part of the Blanking Duty Cycle computation */
384#define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
385#define GTF_M_PRIME (GTF_K * GTF_M / 256)
386 struct drm_display_mode *drm_mode;
387 unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
388 int top_margin, bottom_margin;
389 int interlace;
390 unsigned int hfreq_est;
391 int vsync_plus_bp, vback_porch;
392 unsigned int vtotal_lines, vfieldrate_est, hperiod;
393 unsigned int vfield_rate, vframe_rate;
394 int left_margin, right_margin;
395 unsigned int total_active_pixels, ideal_duty_cycle;
396 unsigned int hblank, total_pixels, pixel_freq;
397 int hsync, hfront_porch, vodd_front_porch_lines;
398 unsigned int tmp1, tmp2;
399
400 drm_mode = drm_mode_create(dev);
401 if (!drm_mode)
402 return NULL;
403
404 /* 1. In order to give correct results, the number of horizontal
405 * pixels requested is first processed to ensure that it is divisible
406 * by the character size, by rounding it to the nearest character
407 * cell boundary:
408 */
409 hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
410 hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
411
412 /* 2. If interlace is requested, the number of vertical lines assumed
413 * by the calculation must be halved, as the computation calculates
414 * the number of vertical lines per field.
415 */
416 if (interlaced)
417 vdisplay_rnd = vdisplay / 2;
418 else
419 vdisplay_rnd = vdisplay;
420
421 /* 3. Find the frame rate required: */
422 if (interlaced)
423 vfieldrate_rqd = vrefresh * 2;
424 else
425 vfieldrate_rqd = vrefresh;
426
427 /* 4. Find number of lines in Top margin: */
428 top_margin = 0;
429 if (margins)
430 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
431 1000;
432 /* 5. Find number of lines in bottom margin: */
433 bottom_margin = top_margin;
434
435 /* 6. If interlace is required, then set variable interlace: */
436 if (interlaced)
437 interlace = 1;
438 else
439 interlace = 0;
440
441 /* 7. Estimate the Horizontal frequency */
442 {
443 tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
444 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
445 2 + interlace;
446 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
447 }
448
449 /* 8. Find the number of lines in V sync + back porch */
450 /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
451 vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
452 vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
453 /* 9. Find the number of lines in V back porch alone: */
454 vback_porch = vsync_plus_bp - V_SYNC_RQD;
455 /* 10. Find the total number of lines in Vertical field period: */
456 vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
457 vsync_plus_bp + GTF_MIN_V_PORCH;
458 /* 11. Estimate the Vertical field frequency: */
459 vfieldrate_est = hfreq_est / vtotal_lines;
460 /* 12. Find the actual horizontal period: */
461 hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
462
463 /* 13. Find the actual Vertical field frequency: */
464 vfield_rate = hfreq_est / vtotal_lines;
465 /* 14. Find the Vertical frame frequency: */
466 if (interlaced)
467 vframe_rate = vfield_rate / 2;
468 else
469 vframe_rate = vfield_rate;
470 /* 15. Find number of pixels in left margin: */
471 if (margins)
472 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
473 1000;
474 else
475 left_margin = 0;
476
477 /* 16.Find number of pixels in right margin: */
478 right_margin = left_margin;
479 /* 17.Find total number of active pixels in image and left and right */
480 total_active_pixels = hdisplay_rnd + left_margin + right_margin;
481 /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
482 ideal_duty_cycle = GTF_C_PRIME * 1000 -
483 (GTF_M_PRIME * 1000000 / hfreq_est);
484 /* 19.Find the number of pixels in the blanking time to the nearest
485 * double character cell: */
486 hblank = total_active_pixels * ideal_duty_cycle /
487 (100000 - ideal_duty_cycle);
488 hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
489 hblank = hblank * 2 * GTF_CELL_GRAN;
490 /* 20.Find total number of pixels: */
491 total_pixels = total_active_pixels + hblank;
492 /* 21.Find pixel clock frequency: */
493 pixel_freq = total_pixels * hfreq_est / 1000;
494 /* Stage 1 computations are now complete; I should really pass
495 * the results to another function and do the Stage 2 computations,
496 * but I only need a few more values so I'll just append the
497 * computations here for now */
498 /* 17. Find the number of pixels in the horizontal sync period: */
499 hsync = H_SYNC_PERCENT * total_pixels / 100;
500 hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
501 hsync = hsync * GTF_CELL_GRAN;
502 /* 18. Find the number of pixels in horizontal front porch period */
503 hfront_porch = hblank / 2 - hsync;
504 /* 36. Find the number of lines in the odd front porch period: */
505 vodd_front_porch_lines = GTF_MIN_V_PORCH ;
506
507 /* finally, pack the results in the mode struct */
508 drm_mode->hdisplay = hdisplay_rnd;
509 drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
510 drm_mode->hsync_end = drm_mode->hsync_start + hsync;
511 drm_mode->htotal = total_pixels;
512 drm_mode->vdisplay = vdisplay_rnd;
513 drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
514 drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
515 drm_mode->vtotal = vtotal_lines;
516
517 drm_mode->clock = pixel_freq;
518
519 if (interlaced) {
520 drm_mode->vtotal *= 2;
521 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
522 }
523
524 drm_mode_set_name(drm_mode);
525 if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
526 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
527 else
528 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
529
530 return drm_mode;
531}
532EXPORT_SYMBOL(drm_gtf_mode_complex);
533
534/**
535 * drm_gtf_mode - create the modeline based on the GTF algorithm
536 * @dev: drm device
537 * @hdisplay: hdisplay size
538 * @vdisplay: vdisplay size
539 * @vrefresh: vrefresh rate.
540 * @interlaced: whether to compute an interlaced mode
541 * @margins: desired margin (borders) size
542 *
543 * return the modeline based on GTF algorithm
544 *
545 * This function is to create the modeline based on the GTF algorithm.
546 * Generalized Timing Formula is derived from:
547 * GTF Spreadsheet by Andy Morrish (1/5/97)
548 * available at http://www.vesa.org
549 *
550 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
551 * What I have done is to translate it by using integer calculation.
552 * I also refer to the function of fb_get_mode in the file of
553 * drivers/video/fbmon.c
554 *
555 * Standard GTF parameters:
556 * M = 600
557 * C = 40
558 * K = 128
559 * J = 20
560 *
561 * Returns:
562 * The modeline based on the GTF algorithm stored in a drm_display_mode object.
563 * The display mode object is allocated with drm_mode_create(). Returns NULL
564 * when no mode could be allocated.
565 */
566struct drm_display_mode *
567drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
568 bool interlaced, int margins)
569{
570 return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
571 interlaced, margins,
572 600, 40 * 2, 128, 20 * 2);
573}
574EXPORT_SYMBOL(drm_gtf_mode);
575
576#ifdef CONFIG_VIDEOMODE_HELPERS
577/**
578 * drm_display_mode_from_videomode - fill in @dmode using @vm,
579 * @vm: videomode structure to use as source
580 * @dmode: drm_display_mode structure to use as destination
581 *
582 * Fills out @dmode using the display mode specified in @vm.
583 */
584void drm_display_mode_from_videomode(const struct videomode *vm,
585 struct drm_display_mode *dmode)
586{
587 dmode->hdisplay = vm->hactive;
588 dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
589 dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
590 dmode->htotal = dmode->hsync_end + vm->hback_porch;
591
592 dmode->vdisplay = vm->vactive;
593 dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
594 dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
595 dmode->vtotal = dmode->vsync_end + vm->vback_porch;
596
597 dmode->clock = vm->pixelclock / 1000;
598
599 dmode->flags = 0;
600 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
601 dmode->flags |= DRM_MODE_FLAG_PHSYNC;
602 else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
603 dmode->flags |= DRM_MODE_FLAG_NHSYNC;
604 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
605 dmode->flags |= DRM_MODE_FLAG_PVSYNC;
606 else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
607 dmode->flags |= DRM_MODE_FLAG_NVSYNC;
608 if (vm->flags & DISPLAY_FLAGS_INTERLACED)
609 dmode->flags |= DRM_MODE_FLAG_INTERLACE;
610 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
611 dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
612 if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
613 dmode->flags |= DRM_MODE_FLAG_DBLCLK;
614 drm_mode_set_name(dmode);
615}
616EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
617
618/**
619 * drm_display_mode_to_videomode - fill in @vm using @dmode,
620 * @dmode: drm_display_mode structure to use as source
621 * @vm: videomode structure to use as destination
622 *
623 * Fills out @vm using the display mode specified in @dmode.
624 */
625void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
626 struct videomode *vm)
627{
628 vm->hactive = dmode->hdisplay;
629 vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
630 vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
631 vm->hback_porch = dmode->htotal - dmode->hsync_end;
632
633 vm->vactive = dmode->vdisplay;
634 vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
635 vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
636 vm->vback_porch = dmode->vtotal - dmode->vsync_end;
637
638 vm->pixelclock = dmode->clock * 1000;
639
640 vm->flags = 0;
641 if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
642 vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
643 else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
644 vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
645 if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
646 vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
647 else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
648 vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
649 if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
650 vm->flags |= DISPLAY_FLAGS_INTERLACED;
651 if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
652 vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
653 if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
654 vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
655}
656EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
657
658#ifdef CONFIG_OF
659/**
660 * of_get_drm_display_mode - get a drm_display_mode from devicetree
661 * @np: device_node with the timing specification
662 * @dmode: will be set to the return value
663 * @index: index into the list of display timings in devicetree
664 *
665 * This function is expensive and should only be used, if only one mode is to be
666 * read from DT. To get multiple modes start with of_get_display_timings and
667 * work with that instead.
668 *
669 * Returns:
670 * 0 on success, a negative errno code when no of videomode node was found.
671 */
672int of_get_drm_display_mode(struct device_node *np,
673 struct drm_display_mode *dmode, int index)
674{
675 struct videomode vm;
676 int ret;
677
678 ret = of_get_videomode(np, &vm, index);
679 if (ret)
680 return ret;
681
682 drm_display_mode_from_videomode(&vm, dmode);
683
684 pr_debug("%s: got %dx%d display mode from %s\n",
685 of_node_full_name(np), vm.hactive, vm.vactive, np->name);
686 drm_mode_debug_printmodeline(dmode);
687
688 return 0;
689}
690EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
691#endif /* CONFIG_OF */
692#endif /* CONFIG_VIDEOMODE_HELPERS */
693
694/**
695 * drm_mode_set_name - set the name on a mode
696 * @mode: name will be set in this mode
697 *
698 * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
699 * with an optional 'i' suffix for interlaced modes.
700 */
701void drm_mode_set_name(struct drm_display_mode *mode)
702{
703 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
704
705 snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
706 mode->hdisplay, mode->vdisplay,
707 interlaced ? "i" : "");
708}
709EXPORT_SYMBOL(drm_mode_set_name);
710
711/**
712 * drm_mode_hsync - get the hsync of a mode
713 * @mode: mode
714 *
715 * Returns:
716 * @modes's hsync rate in kHz, rounded to the nearest integer. Calculates the
717 * value first if it is not yet set.
718 */
719int drm_mode_hsync(const struct drm_display_mode *mode)
720{
721 unsigned int calc_val;
722
723 if (mode->hsync)
724 return mode->hsync;
725
726 if (mode->htotal < 0)
727 return 0;
728
729 calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
730 calc_val += 500; /* round to 1000Hz */
731 calc_val /= 1000; /* truncate to kHz */
732
733 return calc_val;
734}
735EXPORT_SYMBOL(drm_mode_hsync);
736
737/**
738 * drm_mode_vrefresh - get the vrefresh of a mode
739 * @mode: mode
740 *
741 * Returns:
742 * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
743 * value first if it is not yet set.
744 */
745int drm_mode_vrefresh(const struct drm_display_mode *mode)
746{
747 int refresh = 0;
748 unsigned int calc_val;
749
750 if (mode->vrefresh > 0)
751 refresh = mode->vrefresh;
752 else if (mode->htotal > 0 && mode->vtotal > 0) {
753 int vtotal;
754 vtotal = mode->vtotal;
755 /* work out vrefresh the value will be x1000 */
756 calc_val = (mode->clock * 1000);
757 calc_val /= mode->htotal;
758 refresh = (calc_val + vtotal / 2) / vtotal;
759
760 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
761 refresh *= 2;
762 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
763 refresh /= 2;
764 if (mode->vscan > 1)
765 refresh /= mode->vscan;
766 }
767 return refresh;
768}
769EXPORT_SYMBOL(drm_mode_vrefresh);
770
771/**
772 * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
773 * @p: mode
774 * @adjust_flags: a combination of adjustment flags
775 *
776 * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
777 *
778 * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
779 * interlaced modes.
780 * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
781 * buffers containing two eyes (only adjust the timings when needed, eg. for
782 * "frame packing" or "side by side full").
783 * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
784 * be performed for doublescan and vscan > 1 modes respectively.
785 */
786void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
787{
788 if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
789 return;
790
791 p->crtc_clock = p->clock;
792 p->crtc_hdisplay = p->hdisplay;
793 p->crtc_hsync_start = p->hsync_start;
794 p->crtc_hsync_end = p->hsync_end;
795 p->crtc_htotal = p->htotal;
796 p->crtc_hskew = p->hskew;
797 p->crtc_vdisplay = p->vdisplay;
798 p->crtc_vsync_start = p->vsync_start;
799 p->crtc_vsync_end = p->vsync_end;
800 p->crtc_vtotal = p->vtotal;
801
802 if (p->flags & DRM_MODE_FLAG_INTERLACE) {
803 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
804 p->crtc_vdisplay /= 2;
805 p->crtc_vsync_start /= 2;
806 p->crtc_vsync_end /= 2;
807 p->crtc_vtotal /= 2;
808 }
809 }
810
811 if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
812 if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
813 p->crtc_vdisplay *= 2;
814 p->crtc_vsync_start *= 2;
815 p->crtc_vsync_end *= 2;
816 p->crtc_vtotal *= 2;
817 }
818 }
819
820 if (!(adjust_flags & CRTC_NO_VSCAN)) {
821 if (p->vscan > 1) {
822 p->crtc_vdisplay *= p->vscan;
823 p->crtc_vsync_start *= p->vscan;
824 p->crtc_vsync_end *= p->vscan;
825 p->crtc_vtotal *= p->vscan;
826 }
827 }
828
829 if (adjust_flags & CRTC_STEREO_DOUBLE) {
830 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
831
832 switch (layout) {
833 case DRM_MODE_FLAG_3D_FRAME_PACKING:
834 p->crtc_clock *= 2;
835 p->crtc_vdisplay += p->crtc_vtotal;
836 p->crtc_vsync_start += p->crtc_vtotal;
837 p->crtc_vsync_end += p->crtc_vtotal;
838 p->crtc_vtotal += p->crtc_vtotal;
839 break;
840 }
841 }
842
843 p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
844 p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
845 p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
846 p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
847}
848EXPORT_SYMBOL(drm_mode_set_crtcinfo);
849
850/**
851 * drm_mode_copy - copy the mode
852 * @dst: mode to overwrite
853 * @src: mode to copy
854 *
855 * Copy an existing mode into another mode, preserving the object id and
856 * list head of the destination mode.
857 */
858void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
859{
860 int id = dst->base.id;
861 struct list_head head = dst->head;
862
863 *dst = *src;
864 dst->base.id = id;
865 dst->head = head;
866}
867EXPORT_SYMBOL(drm_mode_copy);
868
869/**
870 * drm_mode_duplicate - allocate and duplicate an existing mode
871 * @dev: drm_device to allocate the duplicated mode for
872 * @mode: mode to duplicate
873 *
874 * Just allocate a new mode, copy the existing mode into it, and return
875 * a pointer to it. Used to create new instances of established modes.
876 *
877 * Returns:
878 * Pointer to duplicated mode on success, NULL on error.
879 */
880struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
881 const struct drm_display_mode *mode)
882{
883 struct drm_display_mode *nmode;
884
885 nmode = drm_mode_create(dev);
886 if (!nmode)
887 return NULL;
888
889 drm_mode_copy(nmode, mode);
890
891 return nmode;
892}
893EXPORT_SYMBOL(drm_mode_duplicate);
894
895/**
896 * drm_mode_equal - test modes for equality
897 * @mode1: first mode
898 * @mode2: second mode
899 *
900 * Check to see if @mode1 and @mode2 are equivalent.
901 *
902 * Returns:
903 * True if the modes are equal, false otherwise.
904 */
905bool drm_mode_equal(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
906{
907 if (!mode1 && !mode2)
908 return true;
909
910 if (!mode1 || !mode2)
911 return false;
912
913 /* do clock check convert to PICOS so fb modes get matched
914 * the same */
915 if (mode1->clock && mode2->clock) {
916 if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
917 return false;
918 } else if (mode1->clock != mode2->clock)
919 return false;
920
921 return drm_mode_equal_no_clocks(mode1, mode2);
922}
923EXPORT_SYMBOL(drm_mode_equal);
924
925/**
926 * drm_mode_equal_no_clocks - test modes for equality
927 * @mode1: first mode
928 * @mode2: second mode
929 *
930 * Check to see if @mode1 and @mode2 are equivalent, but
931 * don't check the pixel clocks.
932 *
933 * Returns:
934 * True if the modes are equal, false otherwise.
935 */
936bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
937{
938 if ((mode1->flags & DRM_MODE_FLAG_3D_MASK) !=
939 (mode2->flags & DRM_MODE_FLAG_3D_MASK))
940 return false;
941
942 return drm_mode_equal_no_clocks_no_stereo(mode1, mode2);
943}
944EXPORT_SYMBOL(drm_mode_equal_no_clocks);
945
946/**
947 * drm_mode_equal_no_clocks_no_stereo - test modes for equality
948 * @mode1: first mode
949 * @mode2: second mode
950 *
951 * Check to see if @mode1 and @mode2 are equivalent, but
952 * don't check the pixel clocks nor the stereo layout.
953 *
954 * Returns:
955 * True if the modes are equal, false otherwise.
956 */
957bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
958 const struct drm_display_mode *mode2)
959{
960 if (mode1->hdisplay == mode2->hdisplay &&
961 mode1->hsync_start == mode2->hsync_start &&
962 mode1->hsync_end == mode2->hsync_end &&
963 mode1->htotal == mode2->htotal &&
964 mode1->hskew == mode2->hskew &&
965 mode1->vdisplay == mode2->vdisplay &&
966 mode1->vsync_start == mode2->vsync_start &&
967 mode1->vsync_end == mode2->vsync_end &&
968 mode1->vtotal == mode2->vtotal &&
969 mode1->vscan == mode2->vscan &&
970 (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
971 (mode2->flags & ~DRM_MODE_FLAG_3D_MASK))
972 return true;
973
974 return false;
975}
976EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
977
978/**
979 * drm_mode_validate_basic - make sure the mode is somewhat sane
980 * @mode: mode to check
981 *
982 * Check that the mode timings are at least somewhat reasonable.
983 * Any hardware specific limits are left up for each driver to check.
984 *
985 * Returns:
986 * The mode status
987 */
988enum drm_mode_status
989drm_mode_validate_basic(const struct drm_display_mode *mode)
990{
991 if (mode->clock == 0)
992 return MODE_CLOCK_LOW;
993
994 if (mode->hdisplay == 0 ||
995 mode->hsync_start < mode->hdisplay ||
996 mode->hsync_end < mode->hsync_start ||
997 mode->htotal < mode->hsync_end)
998 return MODE_H_ILLEGAL;
999
1000 if (mode->vdisplay == 0 ||
1001 mode->vsync_start < mode->vdisplay ||
1002 mode->vsync_end < mode->vsync_start ||
1003 mode->vtotal < mode->vsync_end)
1004 return MODE_V_ILLEGAL;
1005
1006 return MODE_OK;
1007}
1008EXPORT_SYMBOL(drm_mode_validate_basic);
1009
1010/**
1011 * drm_mode_validate_size - make sure modes adhere to size constraints
1012 * @mode: mode to check
1013 * @maxX: maximum width
1014 * @maxY: maximum height
1015 *
1016 * This function is a helper which can be used to validate modes against size
1017 * limitations of the DRM device/connector. If a mode is too big its status
1018 * member is updated with the appropriate validation failure code. The list
1019 * itself is not changed.
1020 *
1021 * Returns:
1022 * The mode status
1023 */
1024enum drm_mode_status
1025drm_mode_validate_size(const struct drm_display_mode *mode,
1026 int maxX, int maxY)
1027{
1028 if (maxX > 0 && mode->hdisplay > maxX)
1029 return MODE_VIRTUAL_X;
1030
1031 if (maxY > 0 && mode->vdisplay > maxY)
1032 return MODE_VIRTUAL_Y;
1033
1034 return MODE_OK;
1035}
1036EXPORT_SYMBOL(drm_mode_validate_size);
1037
1038#define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1039
1040static const char * const drm_mode_status_names[] = {
1041 MODE_STATUS(OK),
1042 MODE_STATUS(HSYNC),
1043 MODE_STATUS(VSYNC),
1044 MODE_STATUS(H_ILLEGAL),
1045 MODE_STATUS(V_ILLEGAL),
1046 MODE_STATUS(BAD_WIDTH),
1047 MODE_STATUS(NOMODE),
1048 MODE_STATUS(NO_INTERLACE),
1049 MODE_STATUS(NO_DBLESCAN),
1050 MODE_STATUS(NO_VSCAN),
1051 MODE_STATUS(MEM),
1052 MODE_STATUS(VIRTUAL_X),
1053 MODE_STATUS(VIRTUAL_Y),
1054 MODE_STATUS(MEM_VIRT),
1055 MODE_STATUS(NOCLOCK),
1056 MODE_STATUS(CLOCK_HIGH),
1057 MODE_STATUS(CLOCK_LOW),
1058 MODE_STATUS(CLOCK_RANGE),
1059 MODE_STATUS(BAD_HVALUE),
1060 MODE_STATUS(BAD_VVALUE),
1061 MODE_STATUS(BAD_VSCAN),
1062 MODE_STATUS(HSYNC_NARROW),
1063 MODE_STATUS(HSYNC_WIDE),
1064 MODE_STATUS(HBLANK_NARROW),
1065 MODE_STATUS(HBLANK_WIDE),
1066 MODE_STATUS(VSYNC_NARROW),
1067 MODE_STATUS(VSYNC_WIDE),
1068 MODE_STATUS(VBLANK_NARROW),
1069 MODE_STATUS(VBLANK_WIDE),
1070 MODE_STATUS(PANEL),
1071 MODE_STATUS(INTERLACE_WIDTH),
1072 MODE_STATUS(ONE_WIDTH),
1073 MODE_STATUS(ONE_HEIGHT),
1074 MODE_STATUS(ONE_SIZE),
1075 MODE_STATUS(NO_REDUCED),
1076 MODE_STATUS(NO_STEREO),
1077 MODE_STATUS(STALE),
1078 MODE_STATUS(BAD),
1079 MODE_STATUS(ERROR),
1080};
1081
1082#undef MODE_STATUS
1083
1084static const char *drm_get_mode_status_name(enum drm_mode_status status)
1085{
1086 int index = status + 3;
1087
1088 if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1089 return "";
1090
1091 return drm_mode_status_names[index];
1092}
1093
1094/**
1095 * drm_mode_prune_invalid - remove invalid modes from mode list
1096 * @dev: DRM device
1097 * @mode_list: list of modes to check
1098 * @verbose: be verbose about it
1099 *
1100 * This helper function can be used to prune a display mode list after
1101 * validation has been completed. All modes who's status is not MODE_OK will be
1102 * removed from the list, and if @verbose the status code and mode name is also
1103 * printed to dmesg.
1104 */
1105void drm_mode_prune_invalid(struct drm_device *dev,
1106 struct list_head *mode_list, bool verbose)
1107{
1108 struct drm_display_mode *mode, *t;
1109
1110 list_for_each_entry_safe(mode, t, mode_list, head) {
1111 if (mode->status != MODE_OK) {
1112 list_del(&mode->head);
1113 if (verbose) {
1114 drm_mode_debug_printmodeline(mode);
1115 DRM_DEBUG_KMS("Not using %s mode: %s\n",
1116 mode->name,
1117 drm_get_mode_status_name(mode->status));
1118 }
1119 drm_mode_destroy(dev, mode);
1120 }
1121 }
1122}
1123EXPORT_SYMBOL(drm_mode_prune_invalid);
1124
1125/**
1126 * drm_mode_compare - compare modes for favorability
1127 * @priv: unused
1128 * @lh_a: list_head for first mode
1129 * @lh_b: list_head for second mode
1130 *
1131 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1132 * which is better.
1133 *
1134 * Returns:
1135 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1136 * positive if @lh_b is better than @lh_a.
1137 */
1138static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
1139{
1140 struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1141 struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1142 int diff;
1143
1144 diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1145 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1146 if (diff)
1147 return diff;
1148 diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1149 if (diff)
1150 return diff;
1151
1152 diff = b->vrefresh - a->vrefresh;
1153 if (diff)
1154 return diff;
1155
1156 diff = b->clock - a->clock;
1157 return diff;
1158}
1159
1160/**
1161 * drm_mode_sort - sort mode list
1162 * @mode_list: list of drm_display_mode structures to sort
1163 *
1164 * Sort @mode_list by favorability, moving good modes to the head of the list.
1165 */
1166void drm_mode_sort(struct list_head *mode_list)
1167{
1168 list_sort(NULL, mode_list, drm_mode_compare);
1169}
1170EXPORT_SYMBOL(drm_mode_sort);
1171
1172/**
1173 * drm_mode_connector_list_update - update the mode list for the connector
1174 * @connector: the connector to update
1175 *
1176 * This moves the modes from the @connector probed_modes list
1177 * to the actual mode list. It compares the probed mode against the current
1178 * list and only adds different/new modes.
1179 *
1180 * This is just a helper functions doesn't validate any modes itself and also
1181 * doesn't prune any invalid modes. Callers need to do that themselves.
1182 */
1183void drm_mode_connector_list_update(struct drm_connector *connector)
1184{
1185 struct drm_display_mode *pmode, *pt;
1186
1187 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1188
1189 list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1190 struct drm_display_mode *mode;
1191 bool found_it = false;
1192
1193 /* go through current modes checking for the new probed mode */
1194 list_for_each_entry(mode, &connector->modes, head) {
1195 if (!drm_mode_equal(pmode, mode))
1196 continue;
1197
1198 found_it = true;
1199
1200 /*
1201 * If the old matching mode is stale (ie. left over
1202 * from a previous probe) just replace it outright.
1203 * Otherwise just merge the type bits between all
1204 * equal probed modes.
1205 *
1206 * If two probed modes are considered equal, pick the
1207 * actual timings from the one that's marked as
1208 * preferred (in case the match isn't 100%). If
1209 * multiple or zero preferred modes are present, favor
1210 * the mode added to the probed_modes list first.
1211 */
1212 if (mode->status == MODE_STALE) {
1213 drm_mode_copy(mode, pmode);
1214 } else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1215 (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1216 pmode->type |= mode->type;
1217 drm_mode_copy(mode, pmode);
1218 } else {
1219 mode->type |= pmode->type;
1220 }
1221
1222 list_del(&pmode->head);
1223 drm_mode_destroy(connector->dev, pmode);
1224 break;
1225 }
1226
1227 if (!found_it) {
1228 list_move_tail(&pmode->head, &connector->modes);
1229 }
1230 }
1231}
1232EXPORT_SYMBOL(drm_mode_connector_list_update);
1233
1234/**
1235 * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
1236 * @mode_option: optional per connector mode option
1237 * @connector: connector to parse modeline for
1238 * @mode: preallocated drm_cmdline_mode structure to fill out
1239 *
1240 * This parses @mode_option command line modeline for modes and options to
1241 * configure the connector. If @mode_option is NULL the default command line
1242 * modeline in fb_mode_option will be parsed instead.
1243 *
1244 * This uses the same parameters as the fb modedb.c, except for an extra
1245 * force-enable, force-enable-digital and force-disable bit at the end:
1246 *
1247 * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1248 *
1249 * The intermediate drm_cmdline_mode structure is required to store additional
1250 * options from the command line modline like the force-enable/disable flag.
1251 *
1252 * Returns:
1253 * True if a valid modeline has been parsed, false otherwise.
1254 */
1255bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1256 struct drm_connector *connector,
1257 struct drm_cmdline_mode *mode)
1258{
1259 const char *name;
1260 unsigned int namelen;
1261 bool res_specified = false, bpp_specified = false, refresh_specified = false;
1262 unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
1263 bool yres_specified = false, cvt = false, rb = false;
1264 bool interlace = false, margins = false, was_digit = false;
1265 int i;
1266 enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
1267
1268#ifdef CONFIG_FB
1269 if (!mode_option)
1270 mode_option = fb_mode_option;
1271#endif
1272
1273 if (!mode_option) {
1274 mode->specified = false;
1275 return false;
1276 }
1277
1278 name = mode_option;
1279 namelen = strlen(name);
1280 for (i = namelen-1; i >= 0; i--) {
1281 switch (name[i]) {
1282 case '@':
1283 if (!refresh_specified && !bpp_specified &&
1284 !yres_specified && !cvt && !rb && was_digit) {
1285 refresh = simple_strtol(&name[i+1], NULL, 10);
1286 refresh_specified = true;
1287 was_digit = false;
1288 } else
1289 goto done;
1290 break;
1291 case '-':
1292 if (!bpp_specified && !yres_specified && !cvt &&
1293 !rb && was_digit) {
1294 bpp = simple_strtol(&name[i+1], NULL, 10);
1295 bpp_specified = true;
1296 was_digit = false;
1297 } else
1298 goto done;
1299 break;
1300 case 'x':
1301 if (!yres_specified && was_digit) {
1302 yres = simple_strtol(&name[i+1], NULL, 10);
1303 yres_specified = true;
1304 was_digit = false;
1305 } else
1306 goto done;
1307 break;
1308 case '0' ... '9':
1309 was_digit = true;
1310 break;
1311 case 'M':
1312 if (yres_specified || cvt || was_digit)
1313 goto done;
1314 cvt = true;
1315 break;
1316 case 'R':
1317 if (yres_specified || cvt || rb || was_digit)
1318 goto done;
1319 rb = true;
1320 break;
1321 case 'm':
1322 if (cvt || yres_specified || was_digit)
1323 goto done;
1324 margins = true;
1325 break;
1326 case 'i':
1327 if (cvt || yres_specified || was_digit)
1328 goto done;
1329 interlace = true;
1330 break;
1331 case 'e':
1332 if (yres_specified || bpp_specified || refresh_specified ||
1333 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1334 goto done;
1335
1336 force = DRM_FORCE_ON;
1337 break;
1338 case 'D':
1339 if (yres_specified || bpp_specified || refresh_specified ||
1340 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1341 goto done;
1342
1343 if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1344 (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1345 force = DRM_FORCE_ON;
1346 else
1347 force = DRM_FORCE_ON_DIGITAL;
1348 break;
1349 case 'd':
1350 if (yres_specified || bpp_specified || refresh_specified ||
1351 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1352 goto done;
1353
1354 force = DRM_FORCE_OFF;
1355 break;
1356 default:
1357 goto done;
1358 }
1359 }
1360
1361 if (i < 0 && yres_specified) {
1362 char *ch;
1363 xres = simple_strtol(name, &ch, 10);
1364 if ((ch != NULL) && (*ch == 'x'))
1365 res_specified = true;
1366 else
1367 i = ch - name;
1368 } else if (!yres_specified && was_digit) {
1369 /* catch mode that begins with digits but has no 'x' */
1370 i = 0;
1371 }
1372done:
1373 if (i >= 0) {
1374 pr_warn("[drm] parse error at position %i in video mode '%s'\n",
1375 i, name);
1376 mode->specified = false;
1377 return false;
1378 }
1379
1380 if (res_specified) {
1381 mode->specified = true;
1382 mode->xres = xres;
1383 mode->yres = yres;
1384 }
1385
1386 if (refresh_specified) {
1387 mode->refresh_specified = true;
1388 mode->refresh = refresh;
1389 }
1390
1391 if (bpp_specified) {
1392 mode->bpp_specified = true;
1393 mode->bpp = bpp;
1394 }
1395 mode->rb = rb;
1396 mode->cvt = cvt;
1397 mode->interlace = interlace;
1398 mode->margins = margins;
1399 mode->force = force;
1400
1401 return true;
1402}
1403EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1404
1405/**
1406 * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
1407 * @dev: DRM device to create the new mode for
1408 * @cmd: input command line modeline
1409 *
1410 * Returns:
1411 * Pointer to converted mode on success, NULL on error.
1412 */
1413struct drm_display_mode *
1414drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1415 struct drm_cmdline_mode *cmd)
1416{
1417 struct drm_display_mode *mode;
1418
1419 if (cmd->cvt)
1420 mode = drm_cvt_mode(dev,
1421 cmd->xres, cmd->yres,
1422 cmd->refresh_specified ? cmd->refresh : 60,
1423 cmd->rb, cmd->interlace,
1424 cmd->margins);
1425 else
1426 mode = drm_gtf_mode(dev,
1427 cmd->xres, cmd->yres,
1428 cmd->refresh_specified ? cmd->refresh : 60,
1429 cmd->interlace,
1430 cmd->margins);
1431 if (!mode)
1432 return NULL;
1433
1434 mode->type |= DRM_MODE_TYPE_USERDEF;
1435 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1436 return mode;
1437}
1438EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
1439
1440/**
1441 * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo
1442 * @out: drm_mode_modeinfo struct to return to the user
1443 * @in: drm_display_mode to use
1444 *
1445 * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
1446 * the user.
1447 */
1448void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
1449 const struct drm_display_mode *in)
1450{
1451 WARN(in->hdisplay > USHRT_MAX || in->hsync_start > USHRT_MAX ||
1452 in->hsync_end > USHRT_MAX || in->htotal > USHRT_MAX ||
1453 in->hskew > USHRT_MAX || in->vdisplay > USHRT_MAX ||
1454 in->vsync_start > USHRT_MAX || in->vsync_end > USHRT_MAX ||
1455 in->vtotal > USHRT_MAX || in->vscan > USHRT_MAX,
1456 "timing values too large for mode info\n");
1457
1458 out->clock = in->clock;
1459 out->hdisplay = in->hdisplay;
1460 out->hsync_start = in->hsync_start;
1461 out->hsync_end = in->hsync_end;
1462 out->htotal = in->htotal;
1463 out->hskew = in->hskew;
1464 out->vdisplay = in->vdisplay;
1465 out->vsync_start = in->vsync_start;
1466 out->vsync_end = in->vsync_end;
1467 out->vtotal = in->vtotal;
1468 out->vscan = in->vscan;
1469 out->vrefresh = in->vrefresh;
1470 out->flags = in->flags;
1471 out->type = in->type;
1472 strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1473 out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1474}
1475
1476/**
1477 * drm_crtc_convert_umode - convert a modeinfo into a drm_display_mode
1478 * @out: drm_display_mode to return to the user
1479 * @in: drm_mode_modeinfo to use
1480 *
1481 * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
1482 * the caller.
1483 *
1484 * Returns:
1485 * Zero on success, negative errno on failure.
1486 */
1487int drm_mode_convert_umode(struct drm_display_mode *out,
1488 const struct drm_mode_modeinfo *in)
1489{
1490 int ret = -EINVAL;
1491
1492 if (in->clock > INT_MAX || in->vrefresh > INT_MAX) {
1493 ret = -ERANGE;
1494 goto out;
1495 }
1496
1497 if ((in->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1498 goto out;
1499
1500 out->clock = in->clock;
1501 out->hdisplay = in->hdisplay;
1502 out->hsync_start = in->hsync_start;
1503 out->hsync_end = in->hsync_end;
1504 out->htotal = in->htotal;
1505 out->hskew = in->hskew;
1506 out->vdisplay = in->vdisplay;
1507 out->vsync_start = in->vsync_start;
1508 out->vsync_end = in->vsync_end;
1509 out->vtotal = in->vtotal;
1510 out->vscan = in->vscan;
1511 out->vrefresh = in->vrefresh;
1512 out->flags = in->flags;
1513 out->type = in->type;
1514 strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1515 out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1516
1517 out->status = drm_mode_validate_basic(out);
1518 if (out->status != MODE_OK)
1519 goto out;
1520
1521 ret = 0;
1522
1523out:
1524 return ret;
1525}
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_ERROR("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_ERROR("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_ERROR("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_ERROR("Invalid horizontal porches duration: %uns\n", porches_duration_ns);
413 return -EINVAL;
414 }
415
416 if (bt601) {
417 hfp = params->bt601_hfp;
418 } else {
419 unsigned int hfp_min = DIV_ROUND_UP(params->hfp_ns.min,
420 pixel_duration_ns);
421 unsigned int hbp_min = DIV_ROUND_UP(params->hbp_ns.min,
422 pixel_duration_ns);
423 int porches_rem = porches - hfp_min - hbp_min;
424
425 hfp = hfp_min + DIV_ROUND_UP(porches_rem, 2);
426 }
427
428 drm_dbg_kms(dev, "Horizontal Front Porch: %u\n", hfp);
429
430 hfp_duration_ns = hfp * pixel_duration_ns;
431 if (!bt601 &&
432 (hfp_duration_ns < params->hfp_ns.min ||
433 hfp_duration_ns > params->hfp_ns.max)) {
434 DRM_ERROR("Invalid horizontal front porch duration: %uns (min: %u, max %u)\n",
435 hfp_duration_ns, params->hfp_ns.min, params->hfp_ns.max);
436 return -EINVAL;
437 }
438
439 hbp = porches - hfp;
440 drm_dbg_kms(dev, "Horizontal Back Porch: %u\n", hbp);
441
442 hbp_duration_ns = hbp * pixel_duration_ns;
443 if (!bt601 &&
444 (hbp_duration_ns < params->hbp_ns.min ||
445 hbp_duration_ns > params->hbp_ns.max)) {
446 DRM_ERROR("Invalid horizontal back porch duration: %uns (min: %u, max %u)\n",
447 hbp_duration_ns, params->hbp_ns.min, params->hbp_ns.max);
448 return -EINVAL;
449 }
450
451 if (htotal != (hactive + hfp + hslen + hbp))
452 return -EINVAL;
453
454 mode->clock = pixel_clock_hz / 1000;
455 mode->hdisplay = hactive;
456 mode->hsync_start = mode->hdisplay + hfp;
457 mode->hsync_end = mode->hsync_start + hslen;
458 mode->htotal = mode->hsync_end + hbp;
459
460 if (interlace) {
461 vfp_min = params->vfp_lines.even + params->vfp_lines.odd;
462 vbp_min = params->vbp_lines.even + params->vbp_lines.odd;
463 vslen = params->vslen_lines.even + params->vslen_lines.odd;
464 } else {
465 /*
466 * By convention, NTSC (aka 525/60) systems start with
467 * the even field, but PAL (aka 625/50) systems start
468 * with the odd one.
469 *
470 * PAL systems also have asymmetric timings between the
471 * even and odd field, while NTSC is symmetric.
472 *
473 * Moreover, if we want to create a progressive mode for
474 * PAL, we need to use the odd field timings.
475 *
476 * Since odd == even for NTSC, we can just use the odd
477 * one all the time to simplify the code a bit.
478 */
479 vfp_min = params->vfp_lines.odd;
480 vbp_min = params->vbp_lines.odd;
481 vslen = params->vslen_lines.odd;
482 }
483
484 drm_dbg_kms(dev, "Vertical Sync Period: %u\n", vslen);
485
486 porches = params->num_lines - vactive - vslen;
487 drm_dbg_kms(dev, "Remaining vertical pixels for both porches: %u\n", porches);
488
489 porches_rem = porches - vfp_min - vbp_min;
490 vfp = vfp_min + (porches_rem / 2);
491 drm_dbg_kms(dev, "Vertical Front Porch: %u\n", vfp);
492
493 vbp = porches - vfp;
494 drm_dbg_kms(dev, "Vertical Back Porch: %u\n", vbp);
495
496 vtotal = vactive + vfp + vslen + vbp;
497 if (params->num_lines != vtotal) {
498 DRM_ERROR("Invalid vertical total: %upx (expected %upx)\n",
499 vtotal, params->num_lines);
500 return -EINVAL;
501 }
502
503 mode->vdisplay = vactive;
504 mode->vsync_start = mode->vdisplay + vfp;
505 mode->vsync_end = mode->vsync_start + vslen;
506 mode->vtotal = mode->vsync_end + vbp;
507
508 if (mode->vtotal != params->num_lines)
509 return -EINVAL;
510
511 mode->type = DRM_MODE_TYPE_DRIVER;
512 mode->flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC;
513 if (interlace)
514 mode->flags |= DRM_MODE_FLAG_INTERLACE;
515
516 drm_mode_set_name(mode);
517
518 drm_dbg_kms(dev, "Generated mode " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
519
520 return 0;
521}
522
523/**
524 * drm_analog_tv_mode - create a display mode for an analog TV
525 * @dev: drm device
526 * @tv_mode: TV Mode standard to create a mode for. See DRM_MODE_TV_MODE_*.
527 * @pixel_clock_hz: Pixel Clock Frequency, in Hertz
528 * @hdisplay: hdisplay size
529 * @vdisplay: vdisplay size
530 * @interlace: whether to compute an interlaced mode
531 *
532 * This function creates a struct drm_display_mode instance suited for
533 * an analog TV output, for one of the usual analog TV mode.
534 *
535 * Note that @hdisplay is larger than the usual constraints for the PAL
536 * and NTSC timings, and we'll choose to ignore most timings constraints
537 * to reach those resolutions.
538 *
539 * Returns:
540 *
541 * A pointer to the mode, allocated with drm_mode_create(). Returns NULL
542 * on error.
543 */
544struct drm_display_mode *drm_analog_tv_mode(struct drm_device *dev,
545 enum drm_connector_tv_mode tv_mode,
546 unsigned long pixel_clock_hz,
547 unsigned int hdisplay,
548 unsigned int vdisplay,
549 bool interlace)
550{
551 struct drm_display_mode *mode;
552 enum drm_mode_analog analog;
553 int ret;
554
555 switch (tv_mode) {
556 case DRM_MODE_TV_MODE_NTSC:
557 fallthrough;
558 case DRM_MODE_TV_MODE_NTSC_443:
559 fallthrough;
560 case DRM_MODE_TV_MODE_NTSC_J:
561 fallthrough;
562 case DRM_MODE_TV_MODE_PAL_M:
563 analog = DRM_MODE_ANALOG_NTSC;
564 break;
565
566 case DRM_MODE_TV_MODE_PAL:
567 fallthrough;
568 case DRM_MODE_TV_MODE_PAL_N:
569 fallthrough;
570 case DRM_MODE_TV_MODE_SECAM:
571 analog = DRM_MODE_ANALOG_PAL;
572 break;
573
574 default:
575 return NULL;
576 }
577
578 mode = drm_mode_create(dev);
579 if (!mode)
580 return NULL;
581
582 ret = fill_analog_mode(dev, mode,
583 &tv_modes_parameters[analog],
584 pixel_clock_hz, hdisplay, vdisplay, interlace);
585 if (ret)
586 goto err_free_mode;
587
588 return mode;
589
590err_free_mode:
591 drm_mode_destroy(dev, mode);
592 return NULL;
593}
594EXPORT_SYMBOL(drm_analog_tv_mode);
595
596/**
597 * drm_cvt_mode -create a modeline based on the CVT algorithm
598 * @dev: drm device
599 * @hdisplay: hdisplay size
600 * @vdisplay: vdisplay size
601 * @vrefresh: vrefresh rate
602 * @reduced: whether to use reduced blanking
603 * @interlaced: whether to compute an interlaced mode
604 * @margins: whether to add margins (borders)
605 *
606 * This function is called to generate the modeline based on CVT algorithm
607 * according to the hdisplay, vdisplay, vrefresh.
608 * It is based from the VESA(TM) Coordinated Video Timing Generator by
609 * Graham Loveridge April 9, 2003 available at
610 * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
611 *
612 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
613 * What I have done is to translate it by using integer calculation.
614 *
615 * Returns:
616 * The modeline based on the CVT algorithm stored in a drm_display_mode object.
617 * The display mode object is allocated with drm_mode_create(). Returns NULL
618 * when no mode could be allocated.
619 */
620struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
621 int vdisplay, int vrefresh,
622 bool reduced, bool interlaced, bool margins)
623{
624#define HV_FACTOR 1000
625 /* 1) top/bottom margin size (% of height) - default: 1.8, */
626#define CVT_MARGIN_PERCENTAGE 18
627 /* 2) character cell horizontal granularity (pixels) - default 8 */
628#define CVT_H_GRANULARITY 8
629 /* 3) Minimum vertical porch (lines) - default 3 */
630#define CVT_MIN_V_PORCH 3
631 /* 4) Minimum number of vertical back porch lines - default 6 */
632#define CVT_MIN_V_BPORCH 6
633 /* Pixel Clock step (kHz) */
634#define CVT_CLOCK_STEP 250
635 struct drm_display_mode *drm_mode;
636 unsigned int vfieldrate, hperiod;
637 int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
638 int interlace;
639 u64 tmp;
640
641 if (!hdisplay || !vdisplay)
642 return NULL;
643
644 /* allocate the drm_display_mode structure. If failure, we will
645 * return directly
646 */
647 drm_mode = drm_mode_create(dev);
648 if (!drm_mode)
649 return NULL;
650
651 /* the CVT default refresh rate is 60Hz */
652 if (!vrefresh)
653 vrefresh = 60;
654
655 /* the required field fresh rate */
656 if (interlaced)
657 vfieldrate = vrefresh * 2;
658 else
659 vfieldrate = vrefresh;
660
661 /* horizontal pixels */
662 hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
663
664 /* determine the left&right borders */
665 hmargin = 0;
666 if (margins) {
667 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
668 hmargin -= hmargin % CVT_H_GRANULARITY;
669 }
670 /* find the total active pixels */
671 drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
672
673 /* find the number of lines per field */
674 if (interlaced)
675 vdisplay_rnd = vdisplay / 2;
676 else
677 vdisplay_rnd = vdisplay;
678
679 /* find the top & bottom borders */
680 vmargin = 0;
681 if (margins)
682 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
683
684 drm_mode->vdisplay = vdisplay + 2 * vmargin;
685
686 /* Interlaced */
687 if (interlaced)
688 interlace = 1;
689 else
690 interlace = 0;
691
692 /* Determine VSync Width from aspect ratio */
693 if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
694 vsync = 4;
695 else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
696 vsync = 5;
697 else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
698 vsync = 6;
699 else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
700 vsync = 7;
701 else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
702 vsync = 7;
703 else /* custom */
704 vsync = 10;
705
706 if (!reduced) {
707 /* simplify the GTF calculation */
708 /* 4) Minimum time of vertical sync + back porch interval (µs)
709 * default 550.0
710 */
711 int tmp1, tmp2;
712#define CVT_MIN_VSYNC_BP 550
713 /* 3) Nominal HSync width (% of line period) - default 8 */
714#define CVT_HSYNC_PERCENTAGE 8
715 unsigned int hblank_percentage;
716 int vsyncandback_porch, __maybe_unused vback_porch, hblank;
717
718 /* estimated the horizontal period */
719 tmp1 = HV_FACTOR * 1000000 -
720 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
721 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
722 interlace;
723 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
724
725 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
726 /* 9. Find number of lines in sync + backporch */
727 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
728 vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
729 else
730 vsyncandback_porch = tmp1;
731 /* 10. Find number of lines in back porch */
732 vback_porch = vsyncandback_porch - vsync;
733 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
734 vsyncandback_porch + CVT_MIN_V_PORCH;
735 /* 5) Definition of Horizontal blanking time limitation */
736 /* Gradient (%/kHz) - default 600 */
737#define CVT_M_FACTOR 600
738 /* Offset (%) - default 40 */
739#define CVT_C_FACTOR 40
740 /* Blanking time scaling factor - default 128 */
741#define CVT_K_FACTOR 128
742 /* Scaling factor weighting - default 20 */
743#define CVT_J_FACTOR 20
744#define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256)
745#define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
746 CVT_J_FACTOR)
747 /* 12. Find ideal blanking duty cycle from formula */
748 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
749 hperiod / 1000;
750 /* 13. Blanking time */
751 if (hblank_percentage < 20 * HV_FACTOR)
752 hblank_percentage = 20 * HV_FACTOR;
753 hblank = drm_mode->hdisplay * hblank_percentage /
754 (100 * HV_FACTOR - hblank_percentage);
755 hblank -= hblank % (2 * CVT_H_GRANULARITY);
756 /* 14. find the total pixels per line */
757 drm_mode->htotal = drm_mode->hdisplay + hblank;
758 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
759 drm_mode->hsync_start = drm_mode->hsync_end -
760 (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
761 drm_mode->hsync_start += CVT_H_GRANULARITY -
762 drm_mode->hsync_start % CVT_H_GRANULARITY;
763 /* fill the Vsync values */
764 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
765 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
766 } else {
767 /* Reduced blanking */
768 /* Minimum vertical blanking interval time (µs)- default 460 */
769#define CVT_RB_MIN_VBLANK 460
770 /* Fixed number of clocks for horizontal sync */
771#define CVT_RB_H_SYNC 32
772 /* Fixed number of clocks for horizontal blanking */
773#define CVT_RB_H_BLANK 160
774 /* Fixed number of lines for vertical front porch - default 3*/
775#define CVT_RB_VFPORCH 3
776 int vbilines;
777 int tmp1, tmp2;
778 /* 8. Estimate Horizontal period. */
779 tmp1 = HV_FACTOR * 1000000 -
780 CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
781 tmp2 = vdisplay_rnd + 2 * vmargin;
782 hperiod = tmp1 / (tmp2 * vfieldrate);
783 /* 9. Find number of lines in vertical blanking */
784 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
785 /* 10. Check if vertical blanking is sufficient */
786 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
787 vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
788 /* 11. Find total number of lines in vertical field */
789 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
790 /* 12. Find total number of pixels in a line */
791 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
792 /* Fill in HSync values */
793 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
794 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
795 /* Fill in VSync values */
796 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
797 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
798 }
799 /* 15/13. Find pixel clock frequency (kHz for xf86) */
800 tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
801 tmp *= HV_FACTOR * 1000;
802 do_div(tmp, hperiod);
803 tmp -= drm_mode->clock % CVT_CLOCK_STEP;
804 drm_mode->clock = tmp;
805 /* 18/16. Find actual vertical frame frequency */
806 /* ignore - just set the mode flag for interlaced */
807 if (interlaced) {
808 drm_mode->vtotal *= 2;
809 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
810 }
811 /* Fill the mode line name */
812 drm_mode_set_name(drm_mode);
813 if (reduced)
814 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
815 DRM_MODE_FLAG_NVSYNC);
816 else
817 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
818 DRM_MODE_FLAG_NHSYNC);
819
820 return drm_mode;
821}
822EXPORT_SYMBOL(drm_cvt_mode);
823
824/**
825 * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
826 * @dev: drm device
827 * @hdisplay: hdisplay size
828 * @vdisplay: vdisplay size
829 * @vrefresh: vrefresh rate.
830 * @interlaced: whether to compute an interlaced mode
831 * @margins: desired margin (borders) size
832 * @GTF_M: extended GTF formula parameters
833 * @GTF_2C: extended GTF formula parameters
834 * @GTF_K: extended GTF formula parameters
835 * @GTF_2J: extended GTF formula parameters
836 *
837 * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
838 * in here multiplied by two. For a C of 40, pass in 80.
839 *
840 * Returns:
841 * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
842 * The display mode object is allocated with drm_mode_create(). Returns NULL
843 * when no mode could be allocated.
844 */
845struct drm_display_mode *
846drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
847 int vrefresh, bool interlaced, int margins,
848 int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
849{ /* 1) top/bottom margin size (% of height) - default: 1.8, */
850#define GTF_MARGIN_PERCENTAGE 18
851 /* 2) character cell horizontal granularity (pixels) - default 8 */
852#define GTF_CELL_GRAN 8
853 /* 3) Minimum vertical porch (lines) - default 3 */
854#define GTF_MIN_V_PORCH 1
855 /* width of vsync in lines */
856#define V_SYNC_RQD 3
857 /* width of hsync as % of total line */
858#define H_SYNC_PERCENT 8
859 /* min time of vsync + back porch (microsec) */
860#define MIN_VSYNC_PLUS_BP 550
861 /* C' and M' are part of the Blanking Duty Cycle computation */
862#define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
863#define GTF_M_PRIME (GTF_K * GTF_M / 256)
864 struct drm_display_mode *drm_mode;
865 unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
866 int top_margin, bottom_margin;
867 int interlace;
868 unsigned int hfreq_est;
869 int vsync_plus_bp, __maybe_unused vback_porch;
870 unsigned int vtotal_lines, __maybe_unused vfieldrate_est;
871 unsigned int __maybe_unused hperiod;
872 unsigned int vfield_rate, __maybe_unused vframe_rate;
873 int left_margin, right_margin;
874 unsigned int total_active_pixels, ideal_duty_cycle;
875 unsigned int hblank, total_pixels, pixel_freq;
876 int hsync, hfront_porch, vodd_front_porch_lines;
877 unsigned int tmp1, tmp2;
878
879 if (!hdisplay || !vdisplay)
880 return NULL;
881
882 drm_mode = drm_mode_create(dev);
883 if (!drm_mode)
884 return NULL;
885
886 /* 1. In order to give correct results, the number of horizontal
887 * pixels requested is first processed to ensure that it is divisible
888 * by the character size, by rounding it to the nearest character
889 * cell boundary:
890 */
891 hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
892 hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
893
894 /* 2. If interlace is requested, the number of vertical lines assumed
895 * by the calculation must be halved, as the computation calculates
896 * the number of vertical lines per field.
897 */
898 if (interlaced)
899 vdisplay_rnd = vdisplay / 2;
900 else
901 vdisplay_rnd = vdisplay;
902
903 /* 3. Find the frame rate required: */
904 if (interlaced)
905 vfieldrate_rqd = vrefresh * 2;
906 else
907 vfieldrate_rqd = vrefresh;
908
909 /* 4. Find number of lines in Top margin: */
910 top_margin = 0;
911 if (margins)
912 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
913 1000;
914 /* 5. Find number of lines in bottom margin: */
915 bottom_margin = top_margin;
916
917 /* 6. If interlace is required, then set variable interlace: */
918 if (interlaced)
919 interlace = 1;
920 else
921 interlace = 0;
922
923 /* 7. Estimate the Horizontal frequency */
924 {
925 tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
926 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
927 2 + interlace;
928 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
929 }
930
931 /* 8. Find the number of lines in V sync + back porch */
932 /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
933 vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
934 vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
935 /* 9. Find the number of lines in V back porch alone: */
936 vback_porch = vsync_plus_bp - V_SYNC_RQD;
937 /* 10. Find the total number of lines in Vertical field period: */
938 vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
939 vsync_plus_bp + GTF_MIN_V_PORCH;
940 /* 11. Estimate the Vertical field frequency: */
941 vfieldrate_est = hfreq_est / vtotal_lines;
942 /* 12. Find the actual horizontal period: */
943 hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
944
945 /* 13. Find the actual Vertical field frequency: */
946 vfield_rate = hfreq_est / vtotal_lines;
947 /* 14. Find the Vertical frame frequency: */
948 if (interlaced)
949 vframe_rate = vfield_rate / 2;
950 else
951 vframe_rate = vfield_rate;
952 /* 15. Find number of pixels in left margin: */
953 if (margins)
954 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
955 1000;
956 else
957 left_margin = 0;
958
959 /* 16.Find number of pixels in right margin: */
960 right_margin = left_margin;
961 /* 17.Find total number of active pixels in image and left and right */
962 total_active_pixels = hdisplay_rnd + left_margin + right_margin;
963 /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
964 ideal_duty_cycle = GTF_C_PRIME * 1000 -
965 (GTF_M_PRIME * 1000000 / hfreq_est);
966 /* 19.Find the number of pixels in the blanking time to the nearest
967 * double character cell: */
968 hblank = total_active_pixels * ideal_duty_cycle /
969 (100000 - ideal_duty_cycle);
970 hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
971 hblank = hblank * 2 * GTF_CELL_GRAN;
972 /* 20.Find total number of pixels: */
973 total_pixels = total_active_pixels + hblank;
974 /* 21.Find pixel clock frequency: */
975 pixel_freq = total_pixels * hfreq_est / 1000;
976 /* Stage 1 computations are now complete; I should really pass
977 * the results to another function and do the Stage 2 computations,
978 * but I only need a few more values so I'll just append the
979 * computations here for now */
980 /* 17. Find the number of pixels in the horizontal sync period: */
981 hsync = H_SYNC_PERCENT * total_pixels / 100;
982 hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
983 hsync = hsync * GTF_CELL_GRAN;
984 /* 18. Find the number of pixels in horizontal front porch period */
985 hfront_porch = hblank / 2 - hsync;
986 /* 36. Find the number of lines in the odd front porch period: */
987 vodd_front_porch_lines = GTF_MIN_V_PORCH ;
988
989 /* finally, pack the results in the mode struct */
990 drm_mode->hdisplay = hdisplay_rnd;
991 drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
992 drm_mode->hsync_end = drm_mode->hsync_start + hsync;
993 drm_mode->htotal = total_pixels;
994 drm_mode->vdisplay = vdisplay_rnd;
995 drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
996 drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
997 drm_mode->vtotal = vtotal_lines;
998
999 drm_mode->clock = pixel_freq;
1000
1001 if (interlaced) {
1002 drm_mode->vtotal *= 2;
1003 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
1004 }
1005
1006 drm_mode_set_name(drm_mode);
1007 if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
1008 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
1009 else
1010 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
1011
1012 return drm_mode;
1013}
1014EXPORT_SYMBOL(drm_gtf_mode_complex);
1015
1016/**
1017 * drm_gtf_mode - create the modeline based on the GTF algorithm
1018 * @dev: drm device
1019 * @hdisplay: hdisplay size
1020 * @vdisplay: vdisplay size
1021 * @vrefresh: vrefresh rate.
1022 * @interlaced: whether to compute an interlaced mode
1023 * @margins: desired margin (borders) size
1024 *
1025 * return the modeline based on GTF algorithm
1026 *
1027 * This function is to create the modeline based on the GTF algorithm.
1028 * Generalized Timing Formula is derived from:
1029 *
1030 * GTF Spreadsheet by Andy Morrish (1/5/97)
1031 * available at https://www.vesa.org
1032 *
1033 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
1034 * What I have done is to translate it by using integer calculation.
1035 * I also refer to the function of fb_get_mode in the file of
1036 * drivers/video/fbmon.c
1037 *
1038 * Standard GTF parameters::
1039 *
1040 * M = 600
1041 * C = 40
1042 * K = 128
1043 * J = 20
1044 *
1045 * Returns:
1046 * The modeline based on the GTF algorithm stored in a drm_display_mode object.
1047 * The display mode object is allocated with drm_mode_create(). Returns NULL
1048 * when no mode could be allocated.
1049 */
1050struct drm_display_mode *
1051drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
1052 bool interlaced, int margins)
1053{
1054 return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
1055 interlaced, margins,
1056 600, 40 * 2, 128, 20 * 2);
1057}
1058EXPORT_SYMBOL(drm_gtf_mode);
1059
1060#ifdef CONFIG_VIDEOMODE_HELPERS
1061/**
1062 * drm_display_mode_from_videomode - fill in @dmode using @vm,
1063 * @vm: videomode structure to use as source
1064 * @dmode: drm_display_mode structure to use as destination
1065 *
1066 * Fills out @dmode using the display mode specified in @vm.
1067 */
1068void drm_display_mode_from_videomode(const struct videomode *vm,
1069 struct drm_display_mode *dmode)
1070{
1071 dmode->hdisplay = vm->hactive;
1072 dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
1073 dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
1074 dmode->htotal = dmode->hsync_end + vm->hback_porch;
1075
1076 dmode->vdisplay = vm->vactive;
1077 dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
1078 dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
1079 dmode->vtotal = dmode->vsync_end + vm->vback_porch;
1080
1081 dmode->clock = vm->pixelclock / 1000;
1082
1083 dmode->flags = 0;
1084 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
1085 dmode->flags |= DRM_MODE_FLAG_PHSYNC;
1086 else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
1087 dmode->flags |= DRM_MODE_FLAG_NHSYNC;
1088 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
1089 dmode->flags |= DRM_MODE_FLAG_PVSYNC;
1090 else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
1091 dmode->flags |= DRM_MODE_FLAG_NVSYNC;
1092 if (vm->flags & DISPLAY_FLAGS_INTERLACED)
1093 dmode->flags |= DRM_MODE_FLAG_INTERLACE;
1094 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
1095 dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
1096 if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
1097 dmode->flags |= DRM_MODE_FLAG_DBLCLK;
1098 drm_mode_set_name(dmode);
1099}
1100EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
1101
1102/**
1103 * drm_display_mode_to_videomode - fill in @vm using @dmode,
1104 * @dmode: drm_display_mode structure to use as source
1105 * @vm: videomode structure to use as destination
1106 *
1107 * Fills out @vm using the display mode specified in @dmode.
1108 */
1109void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
1110 struct videomode *vm)
1111{
1112 vm->hactive = dmode->hdisplay;
1113 vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
1114 vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
1115 vm->hback_porch = dmode->htotal - dmode->hsync_end;
1116
1117 vm->vactive = dmode->vdisplay;
1118 vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
1119 vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
1120 vm->vback_porch = dmode->vtotal - dmode->vsync_end;
1121
1122 vm->pixelclock = dmode->clock * 1000;
1123
1124 vm->flags = 0;
1125 if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
1126 vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
1127 else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
1128 vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
1129 if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
1130 vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
1131 else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
1132 vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
1133 if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
1134 vm->flags |= DISPLAY_FLAGS_INTERLACED;
1135 if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
1136 vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
1137 if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
1138 vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
1139}
1140EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
1141
1142/**
1143 * drm_bus_flags_from_videomode - extract information about pixelclk and
1144 * DE polarity from videomode and store it in a separate variable
1145 * @vm: videomode structure to use
1146 * @bus_flags: information about pixelclk, sync and DE polarity will be stored
1147 * here
1148 *
1149 * Sets DRM_BUS_FLAG_DE_(LOW|HIGH), DRM_BUS_FLAG_PIXDATA_DRIVE_(POS|NEG)EDGE
1150 * and DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
1151 * found in @vm
1152 */
1153void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
1154{
1155 *bus_flags = 0;
1156 if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
1157 *bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
1158 if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
1159 *bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
1160
1161 if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
1162 *bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE;
1163 if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
1164 *bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE;
1165
1166 if (vm->flags & DISPLAY_FLAGS_DE_LOW)
1167 *bus_flags |= DRM_BUS_FLAG_DE_LOW;
1168 if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
1169 *bus_flags |= DRM_BUS_FLAG_DE_HIGH;
1170}
1171EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
1172
1173#ifdef CONFIG_OF
1174/**
1175 * of_get_drm_display_mode - get a drm_display_mode from devicetree
1176 * @np: device_node with the timing specification
1177 * @dmode: will be set to the return value
1178 * @bus_flags: information about pixelclk, sync and DE polarity
1179 * @index: index into the list of display timings in devicetree
1180 *
1181 * This function is expensive and should only be used, if only one mode is to be
1182 * read from DT. To get multiple modes start with of_get_display_timings and
1183 * work with that instead.
1184 *
1185 * Returns:
1186 * 0 on success, a negative errno code when no of videomode node was found.
1187 */
1188int of_get_drm_display_mode(struct device_node *np,
1189 struct drm_display_mode *dmode, u32 *bus_flags,
1190 int index)
1191{
1192 struct videomode vm;
1193 int ret;
1194
1195 ret = of_get_videomode(np, &vm, index);
1196 if (ret)
1197 return ret;
1198
1199 drm_display_mode_from_videomode(&vm, dmode);
1200 if (bus_flags)
1201 drm_bus_flags_from_videomode(&vm, bus_flags);
1202
1203 pr_debug("%pOF: got %dx%d display mode\n",
1204 np, vm.hactive, vm.vactive);
1205 drm_mode_debug_printmodeline(dmode);
1206
1207 return 0;
1208}
1209EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
1210
1211/**
1212 * of_get_drm_panel_display_mode - get a panel-timing drm_display_mode from devicetree
1213 * @np: device_node with the panel-timing specification
1214 * @dmode: will be set to the return value
1215 * @bus_flags: information about pixelclk, sync and DE polarity
1216 *
1217 * The mandatory Device Tree properties width-mm and height-mm
1218 * are read and set on the display mode.
1219 *
1220 * Returns:
1221 * Zero on success, negative error code on failure.
1222 */
1223int of_get_drm_panel_display_mode(struct device_node *np,
1224 struct drm_display_mode *dmode, u32 *bus_flags)
1225{
1226 u32 width_mm = 0, height_mm = 0;
1227 struct display_timing timing;
1228 struct videomode vm;
1229 int ret;
1230
1231 ret = of_get_display_timing(np, "panel-timing", &timing);
1232 if (ret)
1233 return ret;
1234
1235 videomode_from_timing(&timing, &vm);
1236
1237 memset(dmode, 0, sizeof(*dmode));
1238 drm_display_mode_from_videomode(&vm, dmode);
1239 if (bus_flags)
1240 drm_bus_flags_from_videomode(&vm, bus_flags);
1241
1242 ret = of_property_read_u32(np, "width-mm", &width_mm);
1243 if (ret)
1244 return ret;
1245
1246 ret = of_property_read_u32(np, "height-mm", &height_mm);
1247 if (ret)
1248 return ret;
1249
1250 dmode->width_mm = width_mm;
1251 dmode->height_mm = height_mm;
1252
1253 drm_mode_debug_printmodeline(dmode);
1254
1255 return 0;
1256}
1257EXPORT_SYMBOL_GPL(of_get_drm_panel_display_mode);
1258#endif /* CONFIG_OF */
1259#endif /* CONFIG_VIDEOMODE_HELPERS */
1260
1261/**
1262 * drm_mode_set_name - set the name on a mode
1263 * @mode: name will be set in this mode
1264 *
1265 * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
1266 * with an optional 'i' suffix for interlaced modes.
1267 */
1268void drm_mode_set_name(struct drm_display_mode *mode)
1269{
1270 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1271
1272 snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
1273 mode->hdisplay, mode->vdisplay,
1274 interlaced ? "i" : "");
1275}
1276EXPORT_SYMBOL(drm_mode_set_name);
1277
1278/**
1279 * drm_mode_vrefresh - get the vrefresh of a mode
1280 * @mode: mode
1281 *
1282 * Returns:
1283 * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
1284 * value first if it is not yet set.
1285 */
1286int drm_mode_vrefresh(const struct drm_display_mode *mode)
1287{
1288 unsigned int num, den;
1289
1290 if (mode->htotal == 0 || mode->vtotal == 0)
1291 return 0;
1292
1293 num = mode->clock;
1294 den = mode->htotal * mode->vtotal;
1295
1296 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
1297 num *= 2;
1298 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
1299 den *= 2;
1300 if (mode->vscan > 1)
1301 den *= mode->vscan;
1302
1303 return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den);
1304}
1305EXPORT_SYMBOL(drm_mode_vrefresh);
1306
1307/**
1308 * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
1309 * @mode: mode to query
1310 * @hdisplay: hdisplay value to fill in
1311 * @vdisplay: vdisplay value to fill in
1312 *
1313 * The vdisplay value will be doubled if the specified mode is a stereo mode of
1314 * the appropriate layout.
1315 */
1316void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
1317 int *hdisplay, int *vdisplay)
1318{
1319 struct drm_display_mode adjusted;
1320
1321 drm_mode_init(&adjusted, mode);
1322
1323 drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
1324 *hdisplay = adjusted.crtc_hdisplay;
1325 *vdisplay = adjusted.crtc_vdisplay;
1326}
1327EXPORT_SYMBOL(drm_mode_get_hv_timing);
1328
1329/**
1330 * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
1331 * @p: mode
1332 * @adjust_flags: a combination of adjustment flags
1333 *
1334 * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
1335 *
1336 * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
1337 * interlaced modes.
1338 * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
1339 * buffers containing two eyes (only adjust the timings when needed, eg. for
1340 * "frame packing" or "side by side full").
1341 * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
1342 * be performed for doublescan and vscan > 1 modes respectively.
1343 */
1344void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
1345{
1346 if (!p)
1347 return;
1348
1349 p->crtc_clock = p->clock;
1350 p->crtc_hdisplay = p->hdisplay;
1351 p->crtc_hsync_start = p->hsync_start;
1352 p->crtc_hsync_end = p->hsync_end;
1353 p->crtc_htotal = p->htotal;
1354 p->crtc_hskew = p->hskew;
1355 p->crtc_vdisplay = p->vdisplay;
1356 p->crtc_vsync_start = p->vsync_start;
1357 p->crtc_vsync_end = p->vsync_end;
1358 p->crtc_vtotal = p->vtotal;
1359
1360 if (p->flags & DRM_MODE_FLAG_INTERLACE) {
1361 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
1362 p->crtc_vdisplay /= 2;
1363 p->crtc_vsync_start /= 2;
1364 p->crtc_vsync_end /= 2;
1365 p->crtc_vtotal /= 2;
1366 }
1367 }
1368
1369 if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
1370 if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
1371 p->crtc_vdisplay *= 2;
1372 p->crtc_vsync_start *= 2;
1373 p->crtc_vsync_end *= 2;
1374 p->crtc_vtotal *= 2;
1375 }
1376 }
1377
1378 if (!(adjust_flags & CRTC_NO_VSCAN)) {
1379 if (p->vscan > 1) {
1380 p->crtc_vdisplay *= p->vscan;
1381 p->crtc_vsync_start *= p->vscan;
1382 p->crtc_vsync_end *= p->vscan;
1383 p->crtc_vtotal *= p->vscan;
1384 }
1385 }
1386
1387 if (adjust_flags & CRTC_STEREO_DOUBLE) {
1388 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
1389
1390 switch (layout) {
1391 case DRM_MODE_FLAG_3D_FRAME_PACKING:
1392 p->crtc_clock *= 2;
1393 p->crtc_vdisplay += p->crtc_vtotal;
1394 p->crtc_vsync_start += p->crtc_vtotal;
1395 p->crtc_vsync_end += p->crtc_vtotal;
1396 p->crtc_vtotal += p->crtc_vtotal;
1397 break;
1398 }
1399 }
1400
1401 p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
1402 p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
1403 p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
1404 p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
1405}
1406EXPORT_SYMBOL(drm_mode_set_crtcinfo);
1407
1408/**
1409 * drm_mode_copy - copy the mode
1410 * @dst: mode to overwrite
1411 * @src: mode to copy
1412 *
1413 * Copy an existing mode into another mode, preserving the
1414 * list head of the destination mode.
1415 */
1416void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
1417{
1418 struct list_head head = dst->head;
1419
1420 *dst = *src;
1421 dst->head = head;
1422}
1423EXPORT_SYMBOL(drm_mode_copy);
1424
1425/**
1426 * drm_mode_init - initialize the mode from another mode
1427 * @dst: mode to overwrite
1428 * @src: mode to copy
1429 *
1430 * Copy an existing mode into another mode, zeroing the
1431 * list head of the destination mode. Typically used
1432 * to guarantee the list head is not left with stack
1433 * garbage in on-stack modes.
1434 */
1435void drm_mode_init(struct drm_display_mode *dst, const struct drm_display_mode *src)
1436{
1437 memset(dst, 0, sizeof(*dst));
1438 drm_mode_copy(dst, src);
1439}
1440EXPORT_SYMBOL(drm_mode_init);
1441
1442/**
1443 * drm_mode_duplicate - allocate and duplicate an existing mode
1444 * @dev: drm_device to allocate the duplicated mode for
1445 * @mode: mode to duplicate
1446 *
1447 * Just allocate a new mode, copy the existing mode into it, and return
1448 * a pointer to it. Used to create new instances of established modes.
1449 *
1450 * Returns:
1451 * Pointer to duplicated mode on success, NULL on error.
1452 */
1453struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
1454 const struct drm_display_mode *mode)
1455{
1456 struct drm_display_mode *nmode;
1457
1458 nmode = drm_mode_create(dev);
1459 if (!nmode)
1460 return NULL;
1461
1462 drm_mode_copy(nmode, mode);
1463
1464 return nmode;
1465}
1466EXPORT_SYMBOL(drm_mode_duplicate);
1467
1468static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
1469 const struct drm_display_mode *mode2)
1470{
1471 return mode1->hdisplay == mode2->hdisplay &&
1472 mode1->hsync_start == mode2->hsync_start &&
1473 mode1->hsync_end == mode2->hsync_end &&
1474 mode1->htotal == mode2->htotal &&
1475 mode1->hskew == mode2->hskew &&
1476 mode1->vdisplay == mode2->vdisplay &&
1477 mode1->vsync_start == mode2->vsync_start &&
1478 mode1->vsync_end == mode2->vsync_end &&
1479 mode1->vtotal == mode2->vtotal &&
1480 mode1->vscan == mode2->vscan;
1481}
1482
1483static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
1484 const struct drm_display_mode *mode2)
1485{
1486 /*
1487 * do clock check convert to PICOS
1488 * so fb modes get matched the same
1489 */
1490 if (mode1->clock && mode2->clock)
1491 return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
1492 else
1493 return mode1->clock == mode2->clock;
1494}
1495
1496static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
1497 const struct drm_display_mode *mode2)
1498{
1499 return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
1500 (mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
1501}
1502
1503static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
1504 const struct drm_display_mode *mode2)
1505{
1506 return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
1507 (mode2->flags & DRM_MODE_FLAG_3D_MASK);
1508}
1509
1510static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
1511 const struct drm_display_mode *mode2)
1512{
1513 return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
1514}
1515
1516/**
1517 * drm_mode_match - test modes for (partial) equality
1518 * @mode1: first mode
1519 * @mode2: second mode
1520 * @match_flags: which parts need to match (DRM_MODE_MATCH_*)
1521 *
1522 * Check to see if @mode1 and @mode2 are equivalent.
1523 *
1524 * Returns:
1525 * True if the modes are (partially) equal, false otherwise.
1526 */
1527bool drm_mode_match(const struct drm_display_mode *mode1,
1528 const struct drm_display_mode *mode2,
1529 unsigned int match_flags)
1530{
1531 if (!mode1 && !mode2)
1532 return true;
1533
1534 if (!mode1 || !mode2)
1535 return false;
1536
1537 if (match_flags & DRM_MODE_MATCH_TIMINGS &&
1538 !drm_mode_match_timings(mode1, mode2))
1539 return false;
1540
1541 if (match_flags & DRM_MODE_MATCH_CLOCK &&
1542 !drm_mode_match_clock(mode1, mode2))
1543 return false;
1544
1545 if (match_flags & DRM_MODE_MATCH_FLAGS &&
1546 !drm_mode_match_flags(mode1, mode2))
1547 return false;
1548
1549 if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
1550 !drm_mode_match_3d_flags(mode1, mode2))
1551 return false;
1552
1553 if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
1554 !drm_mode_match_aspect_ratio(mode1, mode2))
1555 return false;
1556
1557 return true;
1558}
1559EXPORT_SYMBOL(drm_mode_match);
1560
1561/**
1562 * drm_mode_equal - test modes for equality
1563 * @mode1: first mode
1564 * @mode2: second mode
1565 *
1566 * Check to see if @mode1 and @mode2 are equivalent.
1567 *
1568 * Returns:
1569 * True if the modes are equal, false otherwise.
1570 */
1571bool drm_mode_equal(const struct drm_display_mode *mode1,
1572 const struct drm_display_mode *mode2)
1573{
1574 return drm_mode_match(mode1, mode2,
1575 DRM_MODE_MATCH_TIMINGS |
1576 DRM_MODE_MATCH_CLOCK |
1577 DRM_MODE_MATCH_FLAGS |
1578 DRM_MODE_MATCH_3D_FLAGS|
1579 DRM_MODE_MATCH_ASPECT_RATIO);
1580}
1581EXPORT_SYMBOL(drm_mode_equal);
1582
1583/**
1584 * drm_mode_equal_no_clocks - test modes for equality
1585 * @mode1: first mode
1586 * @mode2: second mode
1587 *
1588 * Check to see if @mode1 and @mode2 are equivalent, but
1589 * don't check the pixel clocks.
1590 *
1591 * Returns:
1592 * True if the modes are equal, false otherwise.
1593 */
1594bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
1595 const struct drm_display_mode *mode2)
1596{
1597 return drm_mode_match(mode1, mode2,
1598 DRM_MODE_MATCH_TIMINGS |
1599 DRM_MODE_MATCH_FLAGS |
1600 DRM_MODE_MATCH_3D_FLAGS);
1601}
1602EXPORT_SYMBOL(drm_mode_equal_no_clocks);
1603
1604/**
1605 * drm_mode_equal_no_clocks_no_stereo - test modes for equality
1606 * @mode1: first mode
1607 * @mode2: second mode
1608 *
1609 * Check to see if @mode1 and @mode2 are equivalent, but
1610 * don't check the pixel clocks nor the stereo layout.
1611 *
1612 * Returns:
1613 * True if the modes are equal, false otherwise.
1614 */
1615bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
1616 const struct drm_display_mode *mode2)
1617{
1618 return drm_mode_match(mode1, mode2,
1619 DRM_MODE_MATCH_TIMINGS |
1620 DRM_MODE_MATCH_FLAGS);
1621}
1622EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
1623
1624static enum drm_mode_status
1625drm_mode_validate_basic(const struct drm_display_mode *mode)
1626{
1627 if (mode->type & ~DRM_MODE_TYPE_ALL)
1628 return MODE_BAD;
1629
1630 if (mode->flags & ~DRM_MODE_FLAG_ALL)
1631 return MODE_BAD;
1632
1633 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1634 return MODE_BAD;
1635
1636 if (mode->clock == 0)
1637 return MODE_CLOCK_LOW;
1638
1639 if (mode->hdisplay == 0 ||
1640 mode->hsync_start < mode->hdisplay ||
1641 mode->hsync_end < mode->hsync_start ||
1642 mode->htotal < mode->hsync_end)
1643 return MODE_H_ILLEGAL;
1644
1645 if (mode->vdisplay == 0 ||
1646 mode->vsync_start < mode->vdisplay ||
1647 mode->vsync_end < mode->vsync_start ||
1648 mode->vtotal < mode->vsync_end)
1649 return MODE_V_ILLEGAL;
1650
1651 return MODE_OK;
1652}
1653
1654/**
1655 * drm_mode_validate_driver - make sure the mode is somewhat sane
1656 * @dev: drm device
1657 * @mode: mode to check
1658 *
1659 * First do basic validation on the mode, and then allow the driver
1660 * to check for device/driver specific limitations via the optional
1661 * &drm_mode_config_helper_funcs.mode_valid hook.
1662 *
1663 * Returns:
1664 * The mode status
1665 */
1666enum drm_mode_status
1667drm_mode_validate_driver(struct drm_device *dev,
1668 const struct drm_display_mode *mode)
1669{
1670 enum drm_mode_status status;
1671
1672 status = drm_mode_validate_basic(mode);
1673 if (status != MODE_OK)
1674 return status;
1675
1676 if (dev->mode_config.funcs->mode_valid)
1677 return dev->mode_config.funcs->mode_valid(dev, mode);
1678 else
1679 return MODE_OK;
1680}
1681EXPORT_SYMBOL(drm_mode_validate_driver);
1682
1683/**
1684 * drm_mode_validate_size - make sure modes adhere to size constraints
1685 * @mode: mode to check
1686 * @maxX: maximum width
1687 * @maxY: maximum height
1688 *
1689 * This function is a helper which can be used to validate modes against size
1690 * limitations of the DRM device/connector. If a mode is too big its status
1691 * member is updated with the appropriate validation failure code. The list
1692 * itself is not changed.
1693 *
1694 * Returns:
1695 * The mode status
1696 */
1697enum drm_mode_status
1698drm_mode_validate_size(const struct drm_display_mode *mode,
1699 int maxX, int maxY)
1700{
1701 if (maxX > 0 && mode->hdisplay > maxX)
1702 return MODE_VIRTUAL_X;
1703
1704 if (maxY > 0 && mode->vdisplay > maxY)
1705 return MODE_VIRTUAL_Y;
1706
1707 return MODE_OK;
1708}
1709EXPORT_SYMBOL(drm_mode_validate_size);
1710
1711/**
1712 * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
1713 * @mode: mode to check
1714 * @connector: drm connector under action
1715 *
1716 * This function is a helper which can be used to filter out any YCBCR420
1717 * only mode, when the source doesn't support it.
1718 *
1719 * Returns:
1720 * The mode status
1721 */
1722enum drm_mode_status
1723drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
1724 struct drm_connector *connector)
1725{
1726 if (!connector->ycbcr_420_allowed &&
1727 drm_mode_is_420_only(&connector->display_info, mode))
1728 return MODE_NO_420;
1729
1730 return MODE_OK;
1731}
1732EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
1733
1734#define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1735
1736static const char * const drm_mode_status_names[] = {
1737 MODE_STATUS(OK),
1738 MODE_STATUS(HSYNC),
1739 MODE_STATUS(VSYNC),
1740 MODE_STATUS(H_ILLEGAL),
1741 MODE_STATUS(V_ILLEGAL),
1742 MODE_STATUS(BAD_WIDTH),
1743 MODE_STATUS(NOMODE),
1744 MODE_STATUS(NO_INTERLACE),
1745 MODE_STATUS(NO_DBLESCAN),
1746 MODE_STATUS(NO_VSCAN),
1747 MODE_STATUS(MEM),
1748 MODE_STATUS(VIRTUAL_X),
1749 MODE_STATUS(VIRTUAL_Y),
1750 MODE_STATUS(MEM_VIRT),
1751 MODE_STATUS(NOCLOCK),
1752 MODE_STATUS(CLOCK_HIGH),
1753 MODE_STATUS(CLOCK_LOW),
1754 MODE_STATUS(CLOCK_RANGE),
1755 MODE_STATUS(BAD_HVALUE),
1756 MODE_STATUS(BAD_VVALUE),
1757 MODE_STATUS(BAD_VSCAN),
1758 MODE_STATUS(HSYNC_NARROW),
1759 MODE_STATUS(HSYNC_WIDE),
1760 MODE_STATUS(HBLANK_NARROW),
1761 MODE_STATUS(HBLANK_WIDE),
1762 MODE_STATUS(VSYNC_NARROW),
1763 MODE_STATUS(VSYNC_WIDE),
1764 MODE_STATUS(VBLANK_NARROW),
1765 MODE_STATUS(VBLANK_WIDE),
1766 MODE_STATUS(PANEL),
1767 MODE_STATUS(INTERLACE_WIDTH),
1768 MODE_STATUS(ONE_WIDTH),
1769 MODE_STATUS(ONE_HEIGHT),
1770 MODE_STATUS(ONE_SIZE),
1771 MODE_STATUS(NO_REDUCED),
1772 MODE_STATUS(NO_STEREO),
1773 MODE_STATUS(NO_420),
1774 MODE_STATUS(STALE),
1775 MODE_STATUS(BAD),
1776 MODE_STATUS(ERROR),
1777};
1778
1779#undef MODE_STATUS
1780
1781const char *drm_get_mode_status_name(enum drm_mode_status status)
1782{
1783 int index = status + 3;
1784
1785 if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1786 return "";
1787
1788 return drm_mode_status_names[index];
1789}
1790
1791/**
1792 * drm_mode_prune_invalid - remove invalid modes from mode list
1793 * @dev: DRM device
1794 * @mode_list: list of modes to check
1795 * @verbose: be verbose about it
1796 *
1797 * This helper function can be used to prune a display mode list after
1798 * validation has been completed. All modes whose status is not MODE_OK will be
1799 * removed from the list, and if @verbose the status code and mode name is also
1800 * printed to dmesg.
1801 */
1802void drm_mode_prune_invalid(struct drm_device *dev,
1803 struct list_head *mode_list, bool verbose)
1804{
1805 struct drm_display_mode *mode, *t;
1806
1807 list_for_each_entry_safe(mode, t, mode_list, head) {
1808 if (mode->status != MODE_OK) {
1809 list_del(&mode->head);
1810 if (mode->type & DRM_MODE_TYPE_USERDEF) {
1811 drm_warn(dev, "User-defined mode not supported: "
1812 DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
1813 }
1814 if (verbose) {
1815 drm_mode_debug_printmodeline(mode);
1816 DRM_DEBUG_KMS("Not using %s mode: %s\n",
1817 mode->name,
1818 drm_get_mode_status_name(mode->status));
1819 }
1820 drm_mode_destroy(dev, mode);
1821 }
1822 }
1823}
1824EXPORT_SYMBOL(drm_mode_prune_invalid);
1825
1826/**
1827 * drm_mode_compare - compare modes for favorability
1828 * @priv: unused
1829 * @lh_a: list_head for first mode
1830 * @lh_b: list_head for second mode
1831 *
1832 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1833 * which is better.
1834 *
1835 * Returns:
1836 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1837 * positive if @lh_b is better than @lh_a.
1838 */
1839static int drm_mode_compare(void *priv, const struct list_head *lh_a,
1840 const struct list_head *lh_b)
1841{
1842 struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1843 struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1844 int diff;
1845
1846 diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1847 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1848 if (diff)
1849 return diff;
1850 diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1851 if (diff)
1852 return diff;
1853
1854 diff = drm_mode_vrefresh(b) - drm_mode_vrefresh(a);
1855 if (diff)
1856 return diff;
1857
1858 diff = b->clock - a->clock;
1859 return diff;
1860}
1861
1862/**
1863 * drm_mode_sort - sort mode list
1864 * @mode_list: list of drm_display_mode structures to sort
1865 *
1866 * Sort @mode_list by favorability, moving good modes to the head of the list.
1867 */
1868void drm_mode_sort(struct list_head *mode_list)
1869{
1870 list_sort(NULL, mode_list, drm_mode_compare);
1871}
1872EXPORT_SYMBOL(drm_mode_sort);
1873
1874/**
1875 * drm_connector_list_update - update the mode list for the connector
1876 * @connector: the connector to update
1877 *
1878 * This moves the modes from the @connector probed_modes list
1879 * to the actual mode list. It compares the probed mode against the current
1880 * list and only adds different/new modes.
1881 *
1882 * This is just a helper functions doesn't validate any modes itself and also
1883 * doesn't prune any invalid modes. Callers need to do that themselves.
1884 */
1885void drm_connector_list_update(struct drm_connector *connector)
1886{
1887 struct drm_display_mode *pmode, *pt;
1888
1889 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1890
1891 list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1892 struct drm_display_mode *mode;
1893 bool found_it = false;
1894
1895 /* go through current modes checking for the new probed mode */
1896 list_for_each_entry(mode, &connector->modes, head) {
1897 if (!drm_mode_equal(pmode, mode))
1898 continue;
1899
1900 found_it = true;
1901
1902 /*
1903 * If the old matching mode is stale (ie. left over
1904 * from a previous probe) just replace it outright.
1905 * Otherwise just merge the type bits between all
1906 * equal probed modes.
1907 *
1908 * If two probed modes are considered equal, pick the
1909 * actual timings from the one that's marked as
1910 * preferred (in case the match isn't 100%). If
1911 * multiple or zero preferred modes are present, favor
1912 * the mode added to the probed_modes list first.
1913 */
1914 if (mode->status == MODE_STALE) {
1915 drm_mode_copy(mode, pmode);
1916 } else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1917 (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1918 pmode->type |= mode->type;
1919 drm_mode_copy(mode, pmode);
1920 } else {
1921 mode->type |= pmode->type;
1922 }
1923
1924 list_del(&pmode->head);
1925 drm_mode_destroy(connector->dev, pmode);
1926 break;
1927 }
1928
1929 if (!found_it) {
1930 list_move_tail(&pmode->head, &connector->modes);
1931 }
1932 }
1933}
1934EXPORT_SYMBOL(drm_connector_list_update);
1935
1936static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
1937 struct drm_cmdline_mode *mode)
1938{
1939 unsigned int bpp;
1940
1941 if (str[0] != '-')
1942 return -EINVAL;
1943
1944 str++;
1945 bpp = simple_strtol(str, end_ptr, 10);
1946 if (*end_ptr == str)
1947 return -EINVAL;
1948
1949 mode->bpp = bpp;
1950 mode->bpp_specified = true;
1951
1952 return 0;
1953}
1954
1955static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
1956 struct drm_cmdline_mode *mode)
1957{
1958 unsigned int refresh;
1959
1960 if (str[0] != '@')
1961 return -EINVAL;
1962
1963 str++;
1964 refresh = simple_strtol(str, end_ptr, 10);
1965 if (*end_ptr == str)
1966 return -EINVAL;
1967
1968 mode->refresh = refresh;
1969 mode->refresh_specified = true;
1970
1971 return 0;
1972}
1973
1974static int drm_mode_parse_cmdline_extra(const char *str, int length,
1975 bool freestanding,
1976 const struct drm_connector *connector,
1977 struct drm_cmdline_mode *mode)
1978{
1979 int i;
1980
1981 for (i = 0; i < length; i++) {
1982 switch (str[i]) {
1983 case 'i':
1984 if (freestanding)
1985 return -EINVAL;
1986
1987 mode->interlace = true;
1988 break;
1989 case 'm':
1990 if (freestanding)
1991 return -EINVAL;
1992
1993 mode->margins = true;
1994 break;
1995 case 'D':
1996 if (mode->force != DRM_FORCE_UNSPECIFIED)
1997 return -EINVAL;
1998
1999 if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
2000 (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
2001 mode->force = DRM_FORCE_ON;
2002 else
2003 mode->force = DRM_FORCE_ON_DIGITAL;
2004 break;
2005 case 'd':
2006 if (mode->force != DRM_FORCE_UNSPECIFIED)
2007 return -EINVAL;
2008
2009 mode->force = DRM_FORCE_OFF;
2010 break;
2011 case 'e':
2012 if (mode->force != DRM_FORCE_UNSPECIFIED)
2013 return -EINVAL;
2014
2015 mode->force = DRM_FORCE_ON;
2016 break;
2017 default:
2018 return -EINVAL;
2019 }
2020 }
2021
2022 return 0;
2023}
2024
2025static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
2026 bool extras,
2027 const struct drm_connector *connector,
2028 struct drm_cmdline_mode *mode)
2029{
2030 const char *str_start = str;
2031 bool rb = false, cvt = false;
2032 int xres = 0, yres = 0;
2033 int remaining, i;
2034 char *end_ptr;
2035
2036 xres = simple_strtol(str, &end_ptr, 10);
2037 if (end_ptr == str)
2038 return -EINVAL;
2039
2040 if (end_ptr[0] != 'x')
2041 return -EINVAL;
2042 end_ptr++;
2043
2044 str = end_ptr;
2045 yres = simple_strtol(str, &end_ptr, 10);
2046 if (end_ptr == str)
2047 return -EINVAL;
2048
2049 remaining = length - (end_ptr - str_start);
2050 if (remaining < 0)
2051 return -EINVAL;
2052
2053 for (i = 0; i < remaining; i++) {
2054 switch (end_ptr[i]) {
2055 case 'M':
2056 cvt = true;
2057 break;
2058 case 'R':
2059 rb = true;
2060 break;
2061 default:
2062 /*
2063 * Try to pass that to our extras parsing
2064 * function to handle the case where the
2065 * extras are directly after the resolution
2066 */
2067 if (extras) {
2068 int ret = drm_mode_parse_cmdline_extra(end_ptr + i,
2069 1,
2070 false,
2071 connector,
2072 mode);
2073 if (ret)
2074 return ret;
2075 } else {
2076 return -EINVAL;
2077 }
2078 }
2079 }
2080
2081 mode->xres = xres;
2082 mode->yres = yres;
2083 mode->cvt = cvt;
2084 mode->rb = rb;
2085
2086 return 0;
2087}
2088
2089static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret)
2090{
2091 const char *value;
2092 char *endp;
2093
2094 /*
2095 * delim must point to the '=', otherwise it is a syntax error and
2096 * if delim points to the terminating zero, then delim + 1 will point
2097 * past the end of the string.
2098 */
2099 if (*delim != '=')
2100 return -EINVAL;
2101
2102 value = delim + 1;
2103 *int_ret = simple_strtol(value, &endp, 10);
2104
2105 /* Make sure we have parsed something */
2106 if (endp == value)
2107 return -EINVAL;
2108
2109 return 0;
2110}
2111
2112static int drm_mode_parse_panel_orientation(const char *delim,
2113 struct drm_cmdline_mode *mode)
2114{
2115 const char *value;
2116
2117 if (*delim != '=')
2118 return -EINVAL;
2119
2120 value = delim + 1;
2121 delim = strchr(value, ',');
2122 if (!delim)
2123 delim = value + strlen(value);
2124
2125 if (!strncmp(value, "normal", delim - value))
2126 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
2127 else if (!strncmp(value, "upside_down", delim - value))
2128 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
2129 else if (!strncmp(value, "left_side_up", delim - value))
2130 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
2131 else if (!strncmp(value, "right_side_up", delim - value))
2132 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
2133 else
2134 return -EINVAL;
2135
2136 return 0;
2137}
2138
2139static int drm_mode_parse_tv_mode(const char *delim,
2140 struct drm_cmdline_mode *mode)
2141{
2142 const char *value;
2143 int ret;
2144
2145 if (*delim != '=')
2146 return -EINVAL;
2147
2148 value = delim + 1;
2149 delim = strchr(value, ',');
2150 if (!delim)
2151 delim = value + strlen(value);
2152
2153 ret = drm_get_tv_mode_from_name(value, delim - value);
2154 if (ret < 0)
2155 return ret;
2156
2157 mode->tv_mode_specified = true;
2158 mode->tv_mode = ret;
2159
2160 return 0;
2161}
2162
2163static int drm_mode_parse_cmdline_options(const char *str,
2164 bool freestanding,
2165 const struct drm_connector *connector,
2166 struct drm_cmdline_mode *mode)
2167{
2168 unsigned int deg, margin, rotation = 0;
2169 const char *delim, *option, *sep;
2170
2171 option = str;
2172 do {
2173 delim = strchr(option, '=');
2174 if (!delim) {
2175 delim = strchr(option, ',');
2176
2177 if (!delim)
2178 delim = option + strlen(option);
2179 }
2180
2181 if (!strncmp(option, "rotate", delim - option)) {
2182 if (drm_mode_parse_cmdline_int(delim, °))
2183 return -EINVAL;
2184
2185 switch (deg) {
2186 case 0:
2187 rotation |= DRM_MODE_ROTATE_0;
2188 break;
2189
2190 case 90:
2191 rotation |= DRM_MODE_ROTATE_90;
2192 break;
2193
2194 case 180:
2195 rotation |= DRM_MODE_ROTATE_180;
2196 break;
2197
2198 case 270:
2199 rotation |= DRM_MODE_ROTATE_270;
2200 break;
2201
2202 default:
2203 return -EINVAL;
2204 }
2205 } else if (!strncmp(option, "reflect_x", delim - option)) {
2206 rotation |= DRM_MODE_REFLECT_X;
2207 } else if (!strncmp(option, "reflect_y", delim - option)) {
2208 rotation |= DRM_MODE_REFLECT_Y;
2209 } else if (!strncmp(option, "margin_right", delim - option)) {
2210 if (drm_mode_parse_cmdline_int(delim, &margin))
2211 return -EINVAL;
2212
2213 mode->tv_margins.right = margin;
2214 } else if (!strncmp(option, "margin_left", delim - option)) {
2215 if (drm_mode_parse_cmdline_int(delim, &margin))
2216 return -EINVAL;
2217
2218 mode->tv_margins.left = margin;
2219 } else if (!strncmp(option, "margin_top", delim - option)) {
2220 if (drm_mode_parse_cmdline_int(delim, &margin))
2221 return -EINVAL;
2222
2223 mode->tv_margins.top = margin;
2224 } else if (!strncmp(option, "margin_bottom", delim - option)) {
2225 if (drm_mode_parse_cmdline_int(delim, &margin))
2226 return -EINVAL;
2227
2228 mode->tv_margins.bottom = margin;
2229 } else if (!strncmp(option, "panel_orientation", delim - option)) {
2230 if (drm_mode_parse_panel_orientation(delim, mode))
2231 return -EINVAL;
2232 } else if (!strncmp(option, "tv_mode", delim - option)) {
2233 if (drm_mode_parse_tv_mode(delim, mode))
2234 return -EINVAL;
2235 } else {
2236 return -EINVAL;
2237 }
2238 sep = strchr(delim, ',');
2239 option = sep + 1;
2240 } while (sep);
2241
2242 if (rotation && freestanding)
2243 return -EINVAL;
2244
2245 if (!(rotation & DRM_MODE_ROTATE_MASK))
2246 rotation |= DRM_MODE_ROTATE_0;
2247
2248 /* Make sure there is exactly one rotation defined */
2249 if (!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK))
2250 return -EINVAL;
2251
2252 mode->rotation_reflection = rotation;
2253
2254 return 0;
2255}
2256
2257struct drm_named_mode {
2258 const char *name;
2259 unsigned int pixel_clock_khz;
2260 unsigned int xres;
2261 unsigned int yres;
2262 unsigned int flags;
2263 unsigned int tv_mode;
2264};
2265
2266#define NAMED_MODE(_name, _pclk, _x, _y, _flags, _mode) \
2267 { \
2268 .name = _name, \
2269 .pixel_clock_khz = _pclk, \
2270 .xres = _x, \
2271 .yres = _y, \
2272 .flags = _flags, \
2273 .tv_mode = _mode, \
2274 }
2275
2276static const struct drm_named_mode drm_named_modes[] = {
2277 NAMED_MODE("NTSC", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC),
2278 NAMED_MODE("NTSC-J", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_NTSC_J),
2279 NAMED_MODE("PAL", 13500, 720, 576, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL),
2280 NAMED_MODE("PAL-M", 13500, 720, 480, DRM_MODE_FLAG_INTERLACE, DRM_MODE_TV_MODE_PAL_M),
2281};
2282
2283static int drm_mode_parse_cmdline_named_mode(const char *name,
2284 unsigned int name_end,
2285 struct drm_cmdline_mode *cmdline_mode)
2286{
2287 unsigned int i;
2288
2289 if (!name_end)
2290 return 0;
2291
2292 /* If the name starts with a digit, it's not a named mode */
2293 if (isdigit(name[0]))
2294 return 0;
2295
2296 /*
2297 * If there's an equal sign in the name, the command-line
2298 * contains only an option and no mode.
2299 */
2300 if (strnchr(name, name_end, '='))
2301 return 0;
2302
2303 /* The connection status extras can be set without a mode. */
2304 if (name_end == 1 &&
2305 (name[0] == 'd' || name[0] == 'D' || name[0] == 'e'))
2306 return 0;
2307
2308 /*
2309 * We're sure we're a named mode at this point, iterate over the
2310 * list of modes we're aware of.
2311 */
2312 for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
2313 const struct drm_named_mode *mode = &drm_named_modes[i];
2314 int ret;
2315
2316 ret = str_has_prefix(name, mode->name);
2317 if (ret != name_end)
2318 continue;
2319
2320 strscpy(cmdline_mode->name, mode->name, sizeof(cmdline_mode->name));
2321 cmdline_mode->pixel_clock = mode->pixel_clock_khz;
2322 cmdline_mode->xres = mode->xres;
2323 cmdline_mode->yres = mode->yres;
2324 cmdline_mode->interlace = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
2325 cmdline_mode->tv_mode = mode->tv_mode;
2326 cmdline_mode->tv_mode_specified = true;
2327 cmdline_mode->specified = true;
2328
2329 return 1;
2330 }
2331
2332 return -EINVAL;
2333}
2334
2335/**
2336 * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
2337 * @mode_option: optional per connector mode option
2338 * @connector: connector to parse modeline for
2339 * @mode: preallocated drm_cmdline_mode structure to fill out
2340 *
2341 * This parses @mode_option command line modeline for modes and options to
2342 * configure the connector.
2343 *
2344 * This uses the same parameters as the fb modedb.c, except for an extra
2345 * force-enable, force-enable-digital and force-disable bit at the end::
2346 *
2347 * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
2348 *
2349 * Additionals options can be provided following the mode, using a comma to
2350 * separate each option. Valid options can be found in
2351 * Documentation/fb/modedb.rst.
2352 *
2353 * The intermediate drm_cmdline_mode structure is required to store additional
2354 * options from the command line modline like the force-enable/disable flag.
2355 *
2356 * Returns:
2357 * True if a valid modeline has been parsed, false otherwise.
2358 */
2359bool drm_mode_parse_command_line_for_connector(const char *mode_option,
2360 const struct drm_connector *connector,
2361 struct drm_cmdline_mode *mode)
2362{
2363 const char *name;
2364 bool freestanding = false, parse_extras = false;
2365 unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
2366 unsigned int mode_end = 0;
2367 const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
2368 const char *options_ptr = NULL;
2369 char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
2370 int len, ret;
2371
2372 memset(mode, 0, sizeof(*mode));
2373 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
2374
2375 if (!mode_option)
2376 return false;
2377
2378 name = mode_option;
2379
2380 /* Locate the start of named options */
2381 options_ptr = strchr(name, ',');
2382 if (options_ptr)
2383 options_off = options_ptr - name;
2384 else
2385 options_off = strlen(name);
2386
2387 /* Try to locate the bpp and refresh specifiers, if any */
2388 bpp_ptr = strnchr(name, options_off, '-');
2389 while (bpp_ptr && !isdigit(bpp_ptr[1]))
2390 bpp_ptr = strnchr(bpp_ptr + 1, options_off, '-');
2391 if (bpp_ptr)
2392 bpp_off = bpp_ptr - name;
2393
2394 refresh_ptr = strnchr(name, options_off, '@');
2395 if (refresh_ptr)
2396 refresh_off = refresh_ptr - name;
2397
2398 /* Locate the end of the name / resolution, and parse it */
2399 if (bpp_ptr) {
2400 mode_end = bpp_off;
2401 } else if (refresh_ptr) {
2402 mode_end = refresh_off;
2403 } else if (options_ptr) {
2404 mode_end = options_off;
2405 parse_extras = true;
2406 } else {
2407 mode_end = strlen(name);
2408 parse_extras = true;
2409 }
2410
2411 if (!mode_end)
2412 return false;
2413
2414 ret = drm_mode_parse_cmdline_named_mode(name, mode_end, mode);
2415 if (ret < 0)
2416 return false;
2417
2418 /*
2419 * Having a mode that starts by a letter (and thus is named) and
2420 * an at-sign (used to specify a refresh rate) is disallowed.
2421 */
2422 if (ret && refresh_ptr)
2423 return false;
2424
2425 /* No named mode? Check for a normal mode argument, e.g. 1024x768 */
2426 if (!mode->specified && isdigit(name[0])) {
2427 ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
2428 parse_extras,
2429 connector,
2430 mode);
2431 if (ret)
2432 return false;
2433
2434 mode->specified = true;
2435 }
2436
2437 /* No mode? Check for freestanding extras and/or options */
2438 if (!mode->specified) {
2439 unsigned int len = strlen(mode_option);
2440
2441 if (bpp_ptr || refresh_ptr)
2442 return false; /* syntax error */
2443
2444 if (len == 1 || (len >= 2 && mode_option[1] == ','))
2445 extra_ptr = mode_option;
2446 else
2447 options_ptr = mode_option - 1;
2448
2449 freestanding = true;
2450 }
2451
2452 if (bpp_ptr) {
2453 ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode);
2454 if (ret)
2455 return false;
2456
2457 mode->bpp_specified = true;
2458 }
2459
2460 if (refresh_ptr) {
2461 ret = drm_mode_parse_cmdline_refresh(refresh_ptr,
2462 &refresh_end_ptr, mode);
2463 if (ret)
2464 return false;
2465
2466 mode->refresh_specified = true;
2467 }
2468
2469 /*
2470 * Locate the end of the bpp / refresh, and parse the extras
2471 * if relevant
2472 */
2473 if (bpp_ptr && refresh_ptr)
2474 extra_ptr = max(bpp_end_ptr, refresh_end_ptr);
2475 else if (bpp_ptr)
2476 extra_ptr = bpp_end_ptr;
2477 else if (refresh_ptr)
2478 extra_ptr = refresh_end_ptr;
2479
2480 if (extra_ptr) {
2481 if (options_ptr)
2482 len = options_ptr - extra_ptr;
2483 else
2484 len = strlen(extra_ptr);
2485
2486 ret = drm_mode_parse_cmdline_extra(extra_ptr, len, freestanding,
2487 connector, mode);
2488 if (ret)
2489 return false;
2490 }
2491
2492 if (options_ptr) {
2493 ret = drm_mode_parse_cmdline_options(options_ptr + 1,
2494 freestanding,
2495 connector, mode);
2496 if (ret)
2497 return false;
2498 }
2499
2500 return true;
2501}
2502EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
2503
2504static struct drm_display_mode *drm_named_mode(struct drm_device *dev,
2505 struct drm_cmdline_mode *cmd)
2506{
2507 unsigned int i;
2508
2509 for (i = 0; i < ARRAY_SIZE(drm_named_modes); i++) {
2510 const struct drm_named_mode *named_mode = &drm_named_modes[i];
2511
2512 if (strcmp(cmd->name, named_mode->name))
2513 continue;
2514
2515 if (!cmd->tv_mode_specified)
2516 continue;
2517
2518 return drm_analog_tv_mode(dev,
2519 named_mode->tv_mode,
2520 named_mode->pixel_clock_khz * 1000,
2521 named_mode->xres,
2522 named_mode->yres,
2523 named_mode->flags & DRM_MODE_FLAG_INTERLACE);
2524 }
2525
2526 return NULL;
2527}
2528
2529/**
2530 * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
2531 * @dev: DRM device to create the new mode for
2532 * @cmd: input command line modeline
2533 *
2534 * Returns:
2535 * Pointer to converted mode on success, NULL on error.
2536 */
2537struct drm_display_mode *
2538drm_mode_create_from_cmdline_mode(struct drm_device *dev,
2539 struct drm_cmdline_mode *cmd)
2540{
2541 struct drm_display_mode *mode;
2542
2543 if (cmd->xres == 0 || cmd->yres == 0)
2544 return NULL;
2545
2546 if (strlen(cmd->name))
2547 mode = drm_named_mode(dev, cmd);
2548 else if (cmd->cvt)
2549 mode = drm_cvt_mode(dev,
2550 cmd->xres, cmd->yres,
2551 cmd->refresh_specified ? cmd->refresh : 60,
2552 cmd->rb, cmd->interlace,
2553 cmd->margins);
2554 else
2555 mode = drm_gtf_mode(dev,
2556 cmd->xres, cmd->yres,
2557 cmd->refresh_specified ? cmd->refresh : 60,
2558 cmd->interlace,
2559 cmd->margins);
2560 if (!mode)
2561 return NULL;
2562
2563 mode->type |= DRM_MODE_TYPE_USERDEF;
2564 /* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
2565 if (cmd->xres == 1366)
2566 drm_mode_fixup_1366x768(mode);
2567 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
2568 return mode;
2569}
2570EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
2571
2572/**
2573 * drm_mode_convert_to_umode - convert a drm_display_mode into a modeinfo
2574 * @out: drm_mode_modeinfo struct to return to the user
2575 * @in: drm_display_mode to use
2576 *
2577 * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
2578 * the user.
2579 */
2580void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
2581 const struct drm_display_mode *in)
2582{
2583 out->clock = in->clock;
2584 out->hdisplay = in->hdisplay;
2585 out->hsync_start = in->hsync_start;
2586 out->hsync_end = in->hsync_end;
2587 out->htotal = in->htotal;
2588 out->hskew = in->hskew;
2589 out->vdisplay = in->vdisplay;
2590 out->vsync_start = in->vsync_start;
2591 out->vsync_end = in->vsync_end;
2592 out->vtotal = in->vtotal;
2593 out->vscan = in->vscan;
2594 out->vrefresh = drm_mode_vrefresh(in);
2595 out->flags = in->flags;
2596 out->type = in->type;
2597
2598 switch (in->picture_aspect_ratio) {
2599 case HDMI_PICTURE_ASPECT_4_3:
2600 out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
2601 break;
2602 case HDMI_PICTURE_ASPECT_16_9:
2603 out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
2604 break;
2605 case HDMI_PICTURE_ASPECT_64_27:
2606 out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
2607 break;
2608 case HDMI_PICTURE_ASPECT_256_135:
2609 out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
2610 break;
2611 default:
2612 WARN(1, "Invalid aspect ratio (0%x) on mode\n",
2613 in->picture_aspect_ratio);
2614 fallthrough;
2615 case HDMI_PICTURE_ASPECT_NONE:
2616 out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
2617 break;
2618 }
2619
2620 strscpy_pad(out->name, in->name, sizeof(out->name));
2621}
2622
2623/**
2624 * drm_mode_convert_umode - convert a modeinfo into a drm_display_mode
2625 * @dev: drm device
2626 * @out: drm_display_mode to return to the user
2627 * @in: drm_mode_modeinfo to use
2628 *
2629 * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
2630 * the caller.
2631 *
2632 * Returns:
2633 * Zero on success, negative errno on failure.
2634 */
2635int drm_mode_convert_umode(struct drm_device *dev,
2636 struct drm_display_mode *out,
2637 const struct drm_mode_modeinfo *in)
2638{
2639 if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
2640 return -ERANGE;
2641
2642 out->clock = in->clock;
2643 out->hdisplay = in->hdisplay;
2644 out->hsync_start = in->hsync_start;
2645 out->hsync_end = in->hsync_end;
2646 out->htotal = in->htotal;
2647 out->hskew = in->hskew;
2648 out->vdisplay = in->vdisplay;
2649 out->vsync_start = in->vsync_start;
2650 out->vsync_end = in->vsync_end;
2651 out->vtotal = in->vtotal;
2652 out->vscan = in->vscan;
2653 out->flags = in->flags;
2654 /*
2655 * Old xf86-video-vmware (possibly others too) used to
2656 * leave 'type' uninitialized. Just ignore any bits we
2657 * don't like. It's a just hint after all, and more
2658 * useful for the kernel->userspace direction anyway.
2659 */
2660 out->type = in->type & DRM_MODE_TYPE_ALL;
2661 strscpy_pad(out->name, in->name, sizeof(out->name));
2662
2663 /* Clearing picture aspect ratio bits from out flags,
2664 * as the aspect-ratio information is not stored in
2665 * flags for kernel-mode, but in picture_aspect_ratio.
2666 */
2667 out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
2668
2669 switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
2670 case DRM_MODE_FLAG_PIC_AR_4_3:
2671 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
2672 break;
2673 case DRM_MODE_FLAG_PIC_AR_16_9:
2674 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
2675 break;
2676 case DRM_MODE_FLAG_PIC_AR_64_27:
2677 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27;
2678 break;
2679 case DRM_MODE_FLAG_PIC_AR_256_135:
2680 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_256_135;
2681 break;
2682 case DRM_MODE_FLAG_PIC_AR_NONE:
2683 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
2684 break;
2685 default:
2686 return -EINVAL;
2687 }
2688
2689 out->status = drm_mode_validate_driver(dev, out);
2690 if (out->status != MODE_OK)
2691 return -EINVAL;
2692
2693 drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
2694
2695 return 0;
2696}
2697
2698/**
2699 * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
2700 * output format
2701 *
2702 * @display: display under action
2703 * @mode: video mode to be tested.
2704 *
2705 * Returns:
2706 * true if the mode can be supported in YCBCR420 format
2707 * false if not.
2708 */
2709bool drm_mode_is_420_only(const struct drm_display_info *display,
2710 const struct drm_display_mode *mode)
2711{
2712 u8 vic = drm_match_cea_mode(mode);
2713
2714 return test_bit(vic, display->hdmi.y420_vdb_modes);
2715}
2716EXPORT_SYMBOL(drm_mode_is_420_only);
2717
2718/**
2719 * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
2720 * output format also (along with RGB/YCBCR444/422)
2721 *
2722 * @display: display under action.
2723 * @mode: video mode to be tested.
2724 *
2725 * Returns:
2726 * true if the mode can be support YCBCR420 format
2727 * false if not.
2728 */
2729bool drm_mode_is_420_also(const struct drm_display_info *display,
2730 const struct drm_display_mode *mode)
2731{
2732 u8 vic = drm_match_cea_mode(mode);
2733
2734 return test_bit(vic, display->hdmi.y420_cmdb_modes);
2735}
2736EXPORT_SYMBOL(drm_mode_is_420_also);
2737/**
2738 * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
2739 * output format
2740 *
2741 * @display: display under action.
2742 * @mode: video mode to be tested.
2743 *
2744 * Returns:
2745 * true if the mode can be supported in YCBCR420 format
2746 * false if not.
2747 */
2748bool drm_mode_is_420(const struct drm_display_info *display,
2749 const struct drm_display_mode *mode)
2750{
2751 return drm_mode_is_420_only(display, mode) ||
2752 drm_mode_is_420_also(display, mode);
2753}
2754EXPORT_SYMBOL(drm_mode_is_420);