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1/*
2 * Copyright © 1997-2003 by The XFree86 Project, Inc.
3 * Copyright © 2007 Dave Airlie
4 * Copyright © 2007-2008 Intel Corporation
5 * Jesse Barnes <jesse.barnes@intel.com>
6 * Copyright 2005-2006 Luc Verhaegen
7 * Copyright (c) 2001, Andy Ritger aritger@nvidia.com
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
26 *
27 * Except as contained in this notice, the name of the copyright holder(s)
28 * and author(s) shall not be used in advertising or otherwise to promote
29 * the sale, use or other dealings in this Software without prior written
30 * authorization from the copyright holder(s) and author(s).
31 */
32
33#include <linux/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 " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
53}
54EXPORT_SYMBOL(drm_mode_debug_printmodeline);
55
56/**
57 * drm_mode_create - create a new display mode
58 * @dev: DRM device
59 *
60 * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
61 * and return it.
62 *
63 * Returns:
64 * Pointer to new mode on success, NULL on error.
65 */
66struct drm_display_mode *drm_mode_create(struct drm_device *dev)
67{
68 struct drm_display_mode *nmode;
69
70 nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
71 if (!nmode)
72 return NULL;
73
74 if (drm_mode_object_get(dev, &nmode->base, DRM_MODE_OBJECT_MODE)) {
75 kfree(nmode);
76 return NULL;
77 }
78
79 return nmode;
80}
81EXPORT_SYMBOL(drm_mode_create);
82
83/**
84 * drm_mode_destroy - remove a mode
85 * @dev: DRM device
86 * @mode: mode to remove
87 *
88 * Release @mode's unique ID, then free it @mode structure itself using kfree.
89 */
90void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
91{
92 if (!mode)
93 return;
94
95 drm_mode_object_unregister(dev, &mode->base);
96
97 kfree(mode);
98}
99EXPORT_SYMBOL(drm_mode_destroy);
100
101/**
102 * drm_mode_probed_add - add a mode to a connector's probed_mode list
103 * @connector: connector the new mode
104 * @mode: mode data
105 *
106 * Add @mode to @connector's probed_mode list for later use. This list should
107 * then in a second step get filtered and all the modes actually supported by
108 * the hardware moved to the @connector's modes list.
109 */
110void drm_mode_probed_add(struct drm_connector *connector,
111 struct drm_display_mode *mode)
112{
113 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
114
115 list_add_tail(&mode->head, &connector->probed_modes);
116}
117EXPORT_SYMBOL(drm_mode_probed_add);
118
119/**
120 * drm_cvt_mode -create a modeline based on the CVT algorithm
121 * @dev: drm device
122 * @hdisplay: hdisplay size
123 * @vdisplay: vdisplay size
124 * @vrefresh: vrefresh rate
125 * @reduced: whether to use reduced blanking
126 * @interlaced: whether to compute an interlaced mode
127 * @margins: whether to add margins (borders)
128 *
129 * This function is called to generate the modeline based on CVT algorithm
130 * according to the hdisplay, vdisplay, vrefresh.
131 * It is based from the VESA(TM) Coordinated Video Timing Generator by
132 * Graham Loveridge April 9, 2003 available at
133 * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
134 *
135 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
136 * What I have done is to translate it by using integer calculation.
137 *
138 * Returns:
139 * The modeline based on the CVT algorithm stored in a drm_display_mode object.
140 * The display mode object is allocated with drm_mode_create(). Returns NULL
141 * when no mode could be allocated.
142 */
143struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
144 int vdisplay, int vrefresh,
145 bool reduced, bool interlaced, bool margins)
146{
147#define HV_FACTOR 1000
148 /* 1) top/bottom margin size (% of height) - default: 1.8, */
149#define CVT_MARGIN_PERCENTAGE 18
150 /* 2) character cell horizontal granularity (pixels) - default 8 */
151#define CVT_H_GRANULARITY 8
152 /* 3) Minimum vertical porch (lines) - default 3 */
153#define CVT_MIN_V_PORCH 3
154 /* 4) Minimum number of vertical back porch lines - default 6 */
155#define CVT_MIN_V_BPORCH 6
156 /* Pixel Clock step (kHz) */
157#define CVT_CLOCK_STEP 250
158 struct drm_display_mode *drm_mode;
159 unsigned int vfieldrate, hperiod;
160 int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
161 int interlace;
162 u64 tmp;
163
164 /* allocate the drm_display_mode structure. If failure, we will
165 * return directly
166 */
167 drm_mode = drm_mode_create(dev);
168 if (!drm_mode)
169 return NULL;
170
171 /* the CVT default refresh rate is 60Hz */
172 if (!vrefresh)
173 vrefresh = 60;
174
175 /* the required field fresh rate */
176 if (interlaced)
177 vfieldrate = vrefresh * 2;
178 else
179 vfieldrate = vrefresh;
180
181 /* horizontal pixels */
182 hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
183
184 /* determine the left&right borders */
185 hmargin = 0;
186 if (margins) {
187 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
188 hmargin -= hmargin % CVT_H_GRANULARITY;
189 }
190 /* find the total active pixels */
191 drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
192
193 /* find the number of lines per field */
194 if (interlaced)
195 vdisplay_rnd = vdisplay / 2;
196 else
197 vdisplay_rnd = vdisplay;
198
199 /* find the top & bottom borders */
200 vmargin = 0;
201 if (margins)
202 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
203
204 drm_mode->vdisplay = vdisplay + 2 * vmargin;
205
206 /* Interlaced */
207 if (interlaced)
208 interlace = 1;
209 else
210 interlace = 0;
211
212 /* Determine VSync Width from aspect ratio */
213 if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
214 vsync = 4;
215 else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
216 vsync = 5;
217 else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
218 vsync = 6;
219 else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
220 vsync = 7;
221 else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
222 vsync = 7;
223 else /* custom */
224 vsync = 10;
225
226 if (!reduced) {
227 /* simplify the GTF calculation */
228 /* 4) Minimum time of vertical sync + back porch interval (µs)
229 * default 550.0
230 */
231 int tmp1, tmp2;
232#define CVT_MIN_VSYNC_BP 550
233 /* 3) Nominal HSync width (% of line period) - default 8 */
234#define CVT_HSYNC_PERCENTAGE 8
235 unsigned int hblank_percentage;
236 int vsyncandback_porch, vback_porch, hblank;
237
238 /* estimated the horizontal period */
239 tmp1 = HV_FACTOR * 1000000 -
240 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
241 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
242 interlace;
243 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
244
245 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
246 /* 9. Find number of lines in sync + backporch */
247 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
248 vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
249 else
250 vsyncandback_porch = tmp1;
251 /* 10. Find number of lines in back porch */
252 vback_porch = vsyncandback_porch - vsync;
253 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
254 vsyncandback_porch + CVT_MIN_V_PORCH;
255 /* 5) Definition of Horizontal blanking time limitation */
256 /* Gradient (%/kHz) - default 600 */
257#define CVT_M_FACTOR 600
258 /* Offset (%) - default 40 */
259#define CVT_C_FACTOR 40
260 /* Blanking time scaling factor - default 128 */
261#define CVT_K_FACTOR 128
262 /* Scaling factor weighting - default 20 */
263#define CVT_J_FACTOR 20
264#define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256)
265#define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
266 CVT_J_FACTOR)
267 /* 12. Find ideal blanking duty cycle from formula */
268 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
269 hperiod / 1000;
270 /* 13. Blanking time */
271 if (hblank_percentage < 20 * HV_FACTOR)
272 hblank_percentage = 20 * HV_FACTOR;
273 hblank = drm_mode->hdisplay * hblank_percentage /
274 (100 * HV_FACTOR - hblank_percentage);
275 hblank -= hblank % (2 * CVT_H_GRANULARITY);
276 /* 14. find the total pixels per line */
277 drm_mode->htotal = drm_mode->hdisplay + hblank;
278 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
279 drm_mode->hsync_start = drm_mode->hsync_end -
280 (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
281 drm_mode->hsync_start += CVT_H_GRANULARITY -
282 drm_mode->hsync_start % CVT_H_GRANULARITY;
283 /* fill the Vsync values */
284 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
285 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
286 } else {
287 /* Reduced blanking */
288 /* Minimum vertical blanking interval time (µs)- default 460 */
289#define CVT_RB_MIN_VBLANK 460
290 /* Fixed number of clocks for horizontal sync */
291#define CVT_RB_H_SYNC 32
292 /* Fixed number of clocks for horizontal blanking */
293#define CVT_RB_H_BLANK 160
294 /* Fixed number of lines for vertical front porch - default 3*/
295#define CVT_RB_VFPORCH 3
296 int vbilines;
297 int tmp1, tmp2;
298 /* 8. Estimate Horizontal period. */
299 tmp1 = HV_FACTOR * 1000000 -
300 CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
301 tmp2 = vdisplay_rnd + 2 * vmargin;
302 hperiod = tmp1 / (tmp2 * vfieldrate);
303 /* 9. Find number of lines in vertical blanking */
304 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
305 /* 10. Check if vertical blanking is sufficient */
306 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
307 vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
308 /* 11. Find total number of lines in vertical field */
309 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
310 /* 12. Find total number of pixels in a line */
311 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
312 /* Fill in HSync values */
313 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
314 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
315 /* Fill in VSync values */
316 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
317 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
318 }
319 /* 15/13. Find pixel clock frequency (kHz for xf86) */
320 tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
321 tmp *= HV_FACTOR * 1000;
322 do_div(tmp, hperiod);
323 tmp -= drm_mode->clock % CVT_CLOCK_STEP;
324 drm_mode->clock = tmp;
325 /* 18/16. Find actual vertical frame frequency */
326 /* ignore - just set the mode flag for interlaced */
327 if (interlaced) {
328 drm_mode->vtotal *= 2;
329 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
330 }
331 /* Fill the mode line name */
332 drm_mode_set_name(drm_mode);
333 if (reduced)
334 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
335 DRM_MODE_FLAG_NVSYNC);
336 else
337 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
338 DRM_MODE_FLAG_NHSYNC);
339
340 return drm_mode;
341}
342EXPORT_SYMBOL(drm_cvt_mode);
343
344/**
345 * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
346 * @dev: drm device
347 * @hdisplay: hdisplay size
348 * @vdisplay: vdisplay size
349 * @vrefresh: vrefresh rate.
350 * @interlaced: whether to compute an interlaced mode
351 * @margins: desired margin (borders) size
352 * @GTF_M: extended GTF formula parameters
353 * @GTF_2C: extended GTF formula parameters
354 * @GTF_K: extended GTF formula parameters
355 * @GTF_2J: extended GTF formula parameters
356 *
357 * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
358 * in here multiplied by two. For a C of 40, pass in 80.
359 *
360 * Returns:
361 * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
362 * The display mode object is allocated with drm_mode_create(). Returns NULL
363 * when no mode could be allocated.
364 */
365struct drm_display_mode *
366drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
367 int vrefresh, bool interlaced, int margins,
368 int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
369{ /* 1) top/bottom margin size (% of height) - default: 1.8, */
370#define GTF_MARGIN_PERCENTAGE 18
371 /* 2) character cell horizontal granularity (pixels) - default 8 */
372#define GTF_CELL_GRAN 8
373 /* 3) Minimum vertical porch (lines) - default 3 */
374#define GTF_MIN_V_PORCH 1
375 /* width of vsync in lines */
376#define V_SYNC_RQD 3
377 /* width of hsync as % of total line */
378#define H_SYNC_PERCENT 8
379 /* min time of vsync + back porch (microsec) */
380#define MIN_VSYNC_PLUS_BP 550
381 /* C' and M' are part of the Blanking Duty Cycle computation */
382#define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
383#define GTF_M_PRIME (GTF_K * GTF_M / 256)
384 struct drm_display_mode *drm_mode;
385 unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
386 int top_margin, bottom_margin;
387 int interlace;
388 unsigned int hfreq_est;
389 int vsync_plus_bp, vback_porch;
390 unsigned int vtotal_lines, vfieldrate_est, hperiod;
391 unsigned int vfield_rate, vframe_rate;
392 int left_margin, right_margin;
393 unsigned int total_active_pixels, ideal_duty_cycle;
394 unsigned int hblank, total_pixels, pixel_freq;
395 int hsync, hfront_porch, vodd_front_porch_lines;
396 unsigned int tmp1, tmp2;
397
398 drm_mode = drm_mode_create(dev);
399 if (!drm_mode)
400 return NULL;
401
402 /* 1. In order to give correct results, the number of horizontal
403 * pixels requested is first processed to ensure that it is divisible
404 * by the character size, by rounding it to the nearest character
405 * cell boundary:
406 */
407 hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
408 hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
409
410 /* 2. If interlace is requested, the number of vertical lines assumed
411 * by the calculation must be halved, as the computation calculates
412 * the number of vertical lines per field.
413 */
414 if (interlaced)
415 vdisplay_rnd = vdisplay / 2;
416 else
417 vdisplay_rnd = vdisplay;
418
419 /* 3. Find the frame rate required: */
420 if (interlaced)
421 vfieldrate_rqd = vrefresh * 2;
422 else
423 vfieldrate_rqd = vrefresh;
424
425 /* 4. Find number of lines in Top margin: */
426 top_margin = 0;
427 if (margins)
428 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
429 1000;
430 /* 5. Find number of lines in bottom margin: */
431 bottom_margin = top_margin;
432
433 /* 6. If interlace is required, then set variable interlace: */
434 if (interlaced)
435 interlace = 1;
436 else
437 interlace = 0;
438
439 /* 7. Estimate the Horizontal frequency */
440 {
441 tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
442 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
443 2 + interlace;
444 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
445 }
446
447 /* 8. Find the number of lines in V sync + back porch */
448 /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
449 vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
450 vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
451 /* 9. Find the number of lines in V back porch alone: */
452 vback_porch = vsync_plus_bp - V_SYNC_RQD;
453 /* 10. Find the total number of lines in Vertical field period: */
454 vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
455 vsync_plus_bp + GTF_MIN_V_PORCH;
456 /* 11. Estimate the Vertical field frequency: */
457 vfieldrate_est = hfreq_est / vtotal_lines;
458 /* 12. Find the actual horizontal period: */
459 hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
460
461 /* 13. Find the actual Vertical field frequency: */
462 vfield_rate = hfreq_est / vtotal_lines;
463 /* 14. Find the Vertical frame frequency: */
464 if (interlaced)
465 vframe_rate = vfield_rate / 2;
466 else
467 vframe_rate = vfield_rate;
468 /* 15. Find number of pixels in left margin: */
469 if (margins)
470 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
471 1000;
472 else
473 left_margin = 0;
474
475 /* 16.Find number of pixels in right margin: */
476 right_margin = left_margin;
477 /* 17.Find total number of active pixels in image and left and right */
478 total_active_pixels = hdisplay_rnd + left_margin + right_margin;
479 /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
480 ideal_duty_cycle = GTF_C_PRIME * 1000 -
481 (GTF_M_PRIME * 1000000 / hfreq_est);
482 /* 19.Find the number of pixels in the blanking time to the nearest
483 * double character cell: */
484 hblank = total_active_pixels * ideal_duty_cycle /
485 (100000 - ideal_duty_cycle);
486 hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
487 hblank = hblank * 2 * GTF_CELL_GRAN;
488 /* 20.Find total number of pixels: */
489 total_pixels = total_active_pixels + hblank;
490 /* 21.Find pixel clock frequency: */
491 pixel_freq = total_pixels * hfreq_est / 1000;
492 /* Stage 1 computations are now complete; I should really pass
493 * the results to another function and do the Stage 2 computations,
494 * but I only need a few more values so I'll just append the
495 * computations here for now */
496 /* 17. Find the number of pixels in the horizontal sync period: */
497 hsync = H_SYNC_PERCENT * total_pixels / 100;
498 hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
499 hsync = hsync * GTF_CELL_GRAN;
500 /* 18. Find the number of pixels in horizontal front porch period */
501 hfront_porch = hblank / 2 - hsync;
502 /* 36. Find the number of lines in the odd front porch period: */
503 vodd_front_porch_lines = GTF_MIN_V_PORCH ;
504
505 /* finally, pack the results in the mode struct */
506 drm_mode->hdisplay = hdisplay_rnd;
507 drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
508 drm_mode->hsync_end = drm_mode->hsync_start + hsync;
509 drm_mode->htotal = total_pixels;
510 drm_mode->vdisplay = vdisplay_rnd;
511 drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
512 drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
513 drm_mode->vtotal = vtotal_lines;
514
515 drm_mode->clock = pixel_freq;
516
517 if (interlaced) {
518 drm_mode->vtotal *= 2;
519 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
520 }
521
522 drm_mode_set_name(drm_mode);
523 if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
524 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
525 else
526 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
527
528 return drm_mode;
529}
530EXPORT_SYMBOL(drm_gtf_mode_complex);
531
532/**
533 * drm_gtf_mode - create the modeline based on the GTF algorithm
534 * @dev: drm device
535 * @hdisplay: hdisplay size
536 * @vdisplay: vdisplay size
537 * @vrefresh: vrefresh rate.
538 * @interlaced: whether to compute an interlaced mode
539 * @margins: desired margin (borders) size
540 *
541 * return the modeline based on GTF algorithm
542 *
543 * This function is to create the modeline based on the GTF algorithm.
544 * Generalized Timing Formula is derived from:
545 *
546 * GTF Spreadsheet by Andy Morrish (1/5/97)
547 * available at http://www.vesa.org
548 *
549 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
550 * What I have done is to translate it by using integer calculation.
551 * I also refer to the function of fb_get_mode in the file of
552 * drivers/video/fbmon.c
553 *
554 * Standard GTF parameters::
555 *
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/**
659 * drm_bus_flags_from_videomode - extract information about pixelclk and
660 * DE polarity from videomode and store it in a separate variable
661 * @vm: videomode structure to use
662 * @bus_flags: information about pixelclk and DE polarity will be stored here
663 *
664 * Sets DRM_BUS_FLAG_DE_(LOW|HIGH) and DRM_BUS_FLAG_PIXDATA_(POS|NEG)EDGE
665 * in @bus_flags according to DISPLAY_FLAGS found in @vm
666 */
667void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
668{
669 *bus_flags = 0;
670 if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
671 *bus_flags |= DRM_BUS_FLAG_PIXDATA_POSEDGE;
672 if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
673 *bus_flags |= DRM_BUS_FLAG_PIXDATA_NEGEDGE;
674
675 if (vm->flags & DISPLAY_FLAGS_DE_LOW)
676 *bus_flags |= DRM_BUS_FLAG_DE_LOW;
677 if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
678 *bus_flags |= DRM_BUS_FLAG_DE_HIGH;
679}
680EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
681
682#ifdef CONFIG_OF
683/**
684 * of_get_drm_display_mode - get a drm_display_mode from devicetree
685 * @np: device_node with the timing specification
686 * @dmode: will be set to the return value
687 * @bus_flags: information about pixelclk and DE polarity
688 * @index: index into the list of display timings in devicetree
689 *
690 * This function is expensive and should only be used, if only one mode is to be
691 * read from DT. To get multiple modes start with of_get_display_timings and
692 * work with that instead.
693 *
694 * Returns:
695 * 0 on success, a negative errno code when no of videomode node was found.
696 */
697int of_get_drm_display_mode(struct device_node *np,
698 struct drm_display_mode *dmode, u32 *bus_flags,
699 int index)
700{
701 struct videomode vm;
702 int ret;
703
704 ret = of_get_videomode(np, &vm, index);
705 if (ret)
706 return ret;
707
708 drm_display_mode_from_videomode(&vm, dmode);
709 if (bus_flags)
710 drm_bus_flags_from_videomode(&vm, bus_flags);
711
712 pr_debug("%s: got %dx%d display mode from %s\n",
713 of_node_full_name(np), vm.hactive, vm.vactive, np->name);
714 drm_mode_debug_printmodeline(dmode);
715
716 return 0;
717}
718EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
719#endif /* CONFIG_OF */
720#endif /* CONFIG_VIDEOMODE_HELPERS */
721
722/**
723 * drm_mode_set_name - set the name on a mode
724 * @mode: name will be set in this mode
725 *
726 * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
727 * with an optional 'i' suffix for interlaced modes.
728 */
729void drm_mode_set_name(struct drm_display_mode *mode)
730{
731 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
732
733 snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
734 mode->hdisplay, mode->vdisplay,
735 interlaced ? "i" : "");
736}
737EXPORT_SYMBOL(drm_mode_set_name);
738
739/**
740 * drm_mode_hsync - get the hsync of a mode
741 * @mode: mode
742 *
743 * Returns:
744 * @modes's hsync rate in kHz, rounded to the nearest integer. Calculates the
745 * value first if it is not yet set.
746 */
747int drm_mode_hsync(const struct drm_display_mode *mode)
748{
749 unsigned int calc_val;
750
751 if (mode->hsync)
752 return mode->hsync;
753
754 if (mode->htotal < 0)
755 return 0;
756
757 calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
758 calc_val += 500; /* round to 1000Hz */
759 calc_val /= 1000; /* truncate to kHz */
760
761 return calc_val;
762}
763EXPORT_SYMBOL(drm_mode_hsync);
764
765/**
766 * drm_mode_vrefresh - get the vrefresh of a mode
767 * @mode: mode
768 *
769 * Returns:
770 * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
771 * value first if it is not yet set.
772 */
773int drm_mode_vrefresh(const struct drm_display_mode *mode)
774{
775 int refresh = 0;
776 unsigned int calc_val;
777
778 if (mode->vrefresh > 0)
779 refresh = mode->vrefresh;
780 else if (mode->htotal > 0 && mode->vtotal > 0) {
781 int vtotal;
782 vtotal = mode->vtotal;
783 /* work out vrefresh the value will be x1000 */
784 calc_val = (mode->clock * 1000);
785 calc_val /= mode->htotal;
786 refresh = (calc_val + vtotal / 2) / vtotal;
787
788 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
789 refresh *= 2;
790 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
791 refresh /= 2;
792 if (mode->vscan > 1)
793 refresh /= mode->vscan;
794 }
795 return refresh;
796}
797EXPORT_SYMBOL(drm_mode_vrefresh);
798
799/**
800 * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
801 * @p: mode
802 * @adjust_flags: a combination of adjustment flags
803 *
804 * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
805 *
806 * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
807 * interlaced modes.
808 * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
809 * buffers containing two eyes (only adjust the timings when needed, eg. for
810 * "frame packing" or "side by side full").
811 * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
812 * be performed for doublescan and vscan > 1 modes respectively.
813 */
814void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
815{
816 if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
817 return;
818
819 p->crtc_clock = p->clock;
820 p->crtc_hdisplay = p->hdisplay;
821 p->crtc_hsync_start = p->hsync_start;
822 p->crtc_hsync_end = p->hsync_end;
823 p->crtc_htotal = p->htotal;
824 p->crtc_hskew = p->hskew;
825 p->crtc_vdisplay = p->vdisplay;
826 p->crtc_vsync_start = p->vsync_start;
827 p->crtc_vsync_end = p->vsync_end;
828 p->crtc_vtotal = p->vtotal;
829
830 if (p->flags & DRM_MODE_FLAG_INTERLACE) {
831 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
832 p->crtc_vdisplay /= 2;
833 p->crtc_vsync_start /= 2;
834 p->crtc_vsync_end /= 2;
835 p->crtc_vtotal /= 2;
836 }
837 }
838
839 if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
840 if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
841 p->crtc_vdisplay *= 2;
842 p->crtc_vsync_start *= 2;
843 p->crtc_vsync_end *= 2;
844 p->crtc_vtotal *= 2;
845 }
846 }
847
848 if (!(adjust_flags & CRTC_NO_VSCAN)) {
849 if (p->vscan > 1) {
850 p->crtc_vdisplay *= p->vscan;
851 p->crtc_vsync_start *= p->vscan;
852 p->crtc_vsync_end *= p->vscan;
853 p->crtc_vtotal *= p->vscan;
854 }
855 }
856
857 if (adjust_flags & CRTC_STEREO_DOUBLE) {
858 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
859
860 switch (layout) {
861 case DRM_MODE_FLAG_3D_FRAME_PACKING:
862 p->crtc_clock *= 2;
863 p->crtc_vdisplay += p->crtc_vtotal;
864 p->crtc_vsync_start += p->crtc_vtotal;
865 p->crtc_vsync_end += p->crtc_vtotal;
866 p->crtc_vtotal += p->crtc_vtotal;
867 break;
868 }
869 }
870
871 p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
872 p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
873 p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
874 p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
875}
876EXPORT_SYMBOL(drm_mode_set_crtcinfo);
877
878/**
879 * drm_mode_copy - copy the mode
880 * @dst: mode to overwrite
881 * @src: mode to copy
882 *
883 * Copy an existing mode into another mode, preserving the object id and
884 * list head of the destination mode.
885 */
886void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
887{
888 int id = dst->base.id;
889 struct list_head head = dst->head;
890
891 *dst = *src;
892 dst->base.id = id;
893 dst->head = head;
894}
895EXPORT_SYMBOL(drm_mode_copy);
896
897/**
898 * drm_mode_duplicate - allocate and duplicate an existing mode
899 * @dev: drm_device to allocate the duplicated mode for
900 * @mode: mode to duplicate
901 *
902 * Just allocate a new mode, copy the existing mode into it, and return
903 * a pointer to it. Used to create new instances of established modes.
904 *
905 * Returns:
906 * Pointer to duplicated mode on success, NULL on error.
907 */
908struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
909 const struct drm_display_mode *mode)
910{
911 struct drm_display_mode *nmode;
912
913 nmode = drm_mode_create(dev);
914 if (!nmode)
915 return NULL;
916
917 drm_mode_copy(nmode, mode);
918
919 return nmode;
920}
921EXPORT_SYMBOL(drm_mode_duplicate);
922
923/**
924 * drm_mode_equal - test modes for equality
925 * @mode1: first mode
926 * @mode2: second mode
927 *
928 * Check to see if @mode1 and @mode2 are equivalent.
929 *
930 * Returns:
931 * True if the modes are equal, false otherwise.
932 */
933bool drm_mode_equal(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
934{
935 if (!mode1 && !mode2)
936 return true;
937
938 if (!mode1 || !mode2)
939 return false;
940
941 /* do clock check convert to PICOS so fb modes get matched
942 * the same */
943 if (mode1->clock && mode2->clock) {
944 if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
945 return false;
946 } else if (mode1->clock != mode2->clock)
947 return false;
948
949 return drm_mode_equal_no_clocks(mode1, mode2);
950}
951EXPORT_SYMBOL(drm_mode_equal);
952
953/**
954 * drm_mode_equal_no_clocks - test modes for equality
955 * @mode1: first mode
956 * @mode2: second mode
957 *
958 * Check to see if @mode1 and @mode2 are equivalent, but
959 * don't check the pixel clocks.
960 *
961 * Returns:
962 * True if the modes are equal, false otherwise.
963 */
964bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
965{
966 if ((mode1->flags & DRM_MODE_FLAG_3D_MASK) !=
967 (mode2->flags & DRM_MODE_FLAG_3D_MASK))
968 return false;
969
970 return drm_mode_equal_no_clocks_no_stereo(mode1, mode2);
971}
972EXPORT_SYMBOL(drm_mode_equal_no_clocks);
973
974/**
975 * drm_mode_equal_no_clocks_no_stereo - test modes for equality
976 * @mode1: first mode
977 * @mode2: second mode
978 *
979 * Check to see if @mode1 and @mode2 are equivalent, but
980 * don't check the pixel clocks nor the stereo layout.
981 *
982 * Returns:
983 * True if the modes are equal, false otherwise.
984 */
985bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
986 const struct drm_display_mode *mode2)
987{
988 if (mode1->hdisplay == mode2->hdisplay &&
989 mode1->hsync_start == mode2->hsync_start &&
990 mode1->hsync_end == mode2->hsync_end &&
991 mode1->htotal == mode2->htotal &&
992 mode1->hskew == mode2->hskew &&
993 mode1->vdisplay == mode2->vdisplay &&
994 mode1->vsync_start == mode2->vsync_start &&
995 mode1->vsync_end == mode2->vsync_end &&
996 mode1->vtotal == mode2->vtotal &&
997 mode1->vscan == mode2->vscan &&
998 (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
999 (mode2->flags & ~DRM_MODE_FLAG_3D_MASK))
1000 return true;
1001
1002 return false;
1003}
1004EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
1005
1006/**
1007 * drm_mode_validate_basic - make sure the mode is somewhat sane
1008 * @mode: mode to check
1009 *
1010 * Check that the mode timings are at least somewhat reasonable.
1011 * Any hardware specific limits are left up for each driver to check.
1012 *
1013 * Returns:
1014 * The mode status
1015 */
1016enum drm_mode_status
1017drm_mode_validate_basic(const struct drm_display_mode *mode)
1018{
1019 if (mode->clock == 0)
1020 return MODE_CLOCK_LOW;
1021
1022 if (mode->hdisplay == 0 ||
1023 mode->hsync_start < mode->hdisplay ||
1024 mode->hsync_end < mode->hsync_start ||
1025 mode->htotal < mode->hsync_end)
1026 return MODE_H_ILLEGAL;
1027
1028 if (mode->vdisplay == 0 ||
1029 mode->vsync_start < mode->vdisplay ||
1030 mode->vsync_end < mode->vsync_start ||
1031 mode->vtotal < mode->vsync_end)
1032 return MODE_V_ILLEGAL;
1033
1034 return MODE_OK;
1035}
1036EXPORT_SYMBOL(drm_mode_validate_basic);
1037
1038/**
1039 * drm_mode_validate_size - make sure modes adhere to size constraints
1040 * @mode: mode to check
1041 * @maxX: maximum width
1042 * @maxY: maximum height
1043 *
1044 * This function is a helper which can be used to validate modes against size
1045 * limitations of the DRM device/connector. If a mode is too big its status
1046 * member is updated with the appropriate validation failure code. The list
1047 * itself is not changed.
1048 *
1049 * Returns:
1050 * The mode status
1051 */
1052enum drm_mode_status
1053drm_mode_validate_size(const struct drm_display_mode *mode,
1054 int maxX, int maxY)
1055{
1056 if (maxX > 0 && mode->hdisplay > maxX)
1057 return MODE_VIRTUAL_X;
1058
1059 if (maxY > 0 && mode->vdisplay > maxY)
1060 return MODE_VIRTUAL_Y;
1061
1062 return MODE_OK;
1063}
1064EXPORT_SYMBOL(drm_mode_validate_size);
1065
1066#define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1067
1068static const char * const drm_mode_status_names[] = {
1069 MODE_STATUS(OK),
1070 MODE_STATUS(HSYNC),
1071 MODE_STATUS(VSYNC),
1072 MODE_STATUS(H_ILLEGAL),
1073 MODE_STATUS(V_ILLEGAL),
1074 MODE_STATUS(BAD_WIDTH),
1075 MODE_STATUS(NOMODE),
1076 MODE_STATUS(NO_INTERLACE),
1077 MODE_STATUS(NO_DBLESCAN),
1078 MODE_STATUS(NO_VSCAN),
1079 MODE_STATUS(MEM),
1080 MODE_STATUS(VIRTUAL_X),
1081 MODE_STATUS(VIRTUAL_Y),
1082 MODE_STATUS(MEM_VIRT),
1083 MODE_STATUS(NOCLOCK),
1084 MODE_STATUS(CLOCK_HIGH),
1085 MODE_STATUS(CLOCK_LOW),
1086 MODE_STATUS(CLOCK_RANGE),
1087 MODE_STATUS(BAD_HVALUE),
1088 MODE_STATUS(BAD_VVALUE),
1089 MODE_STATUS(BAD_VSCAN),
1090 MODE_STATUS(HSYNC_NARROW),
1091 MODE_STATUS(HSYNC_WIDE),
1092 MODE_STATUS(HBLANK_NARROW),
1093 MODE_STATUS(HBLANK_WIDE),
1094 MODE_STATUS(VSYNC_NARROW),
1095 MODE_STATUS(VSYNC_WIDE),
1096 MODE_STATUS(VBLANK_NARROW),
1097 MODE_STATUS(VBLANK_WIDE),
1098 MODE_STATUS(PANEL),
1099 MODE_STATUS(INTERLACE_WIDTH),
1100 MODE_STATUS(ONE_WIDTH),
1101 MODE_STATUS(ONE_HEIGHT),
1102 MODE_STATUS(ONE_SIZE),
1103 MODE_STATUS(NO_REDUCED),
1104 MODE_STATUS(NO_STEREO),
1105 MODE_STATUS(STALE),
1106 MODE_STATUS(BAD),
1107 MODE_STATUS(ERROR),
1108};
1109
1110#undef MODE_STATUS
1111
1112static const char *drm_get_mode_status_name(enum drm_mode_status status)
1113{
1114 int index = status + 3;
1115
1116 if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1117 return "";
1118
1119 return drm_mode_status_names[index];
1120}
1121
1122/**
1123 * drm_mode_prune_invalid - remove invalid modes from mode list
1124 * @dev: DRM device
1125 * @mode_list: list of modes to check
1126 * @verbose: be verbose about it
1127 *
1128 * This helper function can be used to prune a display mode list after
1129 * validation has been completed. All modes who's status is not MODE_OK will be
1130 * removed from the list, and if @verbose the status code and mode name is also
1131 * printed to dmesg.
1132 */
1133void drm_mode_prune_invalid(struct drm_device *dev,
1134 struct list_head *mode_list, bool verbose)
1135{
1136 struct drm_display_mode *mode, *t;
1137
1138 list_for_each_entry_safe(mode, t, mode_list, head) {
1139 if (mode->status != MODE_OK) {
1140 list_del(&mode->head);
1141 if (verbose) {
1142 drm_mode_debug_printmodeline(mode);
1143 DRM_DEBUG_KMS("Not using %s mode: %s\n",
1144 mode->name,
1145 drm_get_mode_status_name(mode->status));
1146 }
1147 drm_mode_destroy(dev, mode);
1148 }
1149 }
1150}
1151EXPORT_SYMBOL(drm_mode_prune_invalid);
1152
1153/**
1154 * drm_mode_compare - compare modes for favorability
1155 * @priv: unused
1156 * @lh_a: list_head for first mode
1157 * @lh_b: list_head for second mode
1158 *
1159 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1160 * which is better.
1161 *
1162 * Returns:
1163 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1164 * positive if @lh_b is better than @lh_a.
1165 */
1166static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
1167{
1168 struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1169 struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1170 int diff;
1171
1172 diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1173 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1174 if (diff)
1175 return diff;
1176 diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1177 if (diff)
1178 return diff;
1179
1180 diff = b->vrefresh - a->vrefresh;
1181 if (diff)
1182 return diff;
1183
1184 diff = b->clock - a->clock;
1185 return diff;
1186}
1187
1188/**
1189 * drm_mode_sort - sort mode list
1190 * @mode_list: list of drm_display_mode structures to sort
1191 *
1192 * Sort @mode_list by favorability, moving good modes to the head of the list.
1193 */
1194void drm_mode_sort(struct list_head *mode_list)
1195{
1196 list_sort(NULL, mode_list, drm_mode_compare);
1197}
1198EXPORT_SYMBOL(drm_mode_sort);
1199
1200/**
1201 * drm_mode_connector_list_update - update the mode list for the connector
1202 * @connector: the connector to update
1203 *
1204 * This moves the modes from the @connector probed_modes list
1205 * to the actual mode list. It compares the probed mode against the current
1206 * list and only adds different/new modes.
1207 *
1208 * This is just a helper functions doesn't validate any modes itself and also
1209 * doesn't prune any invalid modes. Callers need to do that themselves.
1210 */
1211void drm_mode_connector_list_update(struct drm_connector *connector)
1212{
1213 struct drm_display_mode *pmode, *pt;
1214
1215 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1216
1217 list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1218 struct drm_display_mode *mode;
1219 bool found_it = false;
1220
1221 /* go through current modes checking for the new probed mode */
1222 list_for_each_entry(mode, &connector->modes, head) {
1223 if (!drm_mode_equal(pmode, mode))
1224 continue;
1225
1226 found_it = true;
1227
1228 /*
1229 * If the old matching mode is stale (ie. left over
1230 * from a previous probe) just replace it outright.
1231 * Otherwise just merge the type bits between all
1232 * equal probed modes.
1233 *
1234 * If two probed modes are considered equal, pick the
1235 * actual timings from the one that's marked as
1236 * preferred (in case the match isn't 100%). If
1237 * multiple or zero preferred modes are present, favor
1238 * the mode added to the probed_modes list first.
1239 */
1240 if (mode->status == MODE_STALE) {
1241 drm_mode_copy(mode, pmode);
1242 } else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1243 (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1244 pmode->type |= mode->type;
1245 drm_mode_copy(mode, pmode);
1246 } else {
1247 mode->type |= pmode->type;
1248 }
1249
1250 list_del(&pmode->head);
1251 drm_mode_destroy(connector->dev, pmode);
1252 break;
1253 }
1254
1255 if (!found_it) {
1256 list_move_tail(&pmode->head, &connector->modes);
1257 }
1258 }
1259}
1260EXPORT_SYMBOL(drm_mode_connector_list_update);
1261
1262/**
1263 * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
1264 * @mode_option: optional per connector mode option
1265 * @connector: connector to parse modeline for
1266 * @mode: preallocated drm_cmdline_mode structure to fill out
1267 *
1268 * This parses @mode_option command line modeline for modes and options to
1269 * configure the connector. If @mode_option is NULL the default command line
1270 * modeline in fb_mode_option will be parsed instead.
1271 *
1272 * This uses the same parameters as the fb modedb.c, except for an extra
1273 * force-enable, force-enable-digital and force-disable bit at the end:
1274 *
1275 * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1276 *
1277 * The intermediate drm_cmdline_mode structure is required to store additional
1278 * options from the command line modline like the force-enable/disable flag.
1279 *
1280 * Returns:
1281 * True if a valid modeline has been parsed, false otherwise.
1282 */
1283bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1284 struct drm_connector *connector,
1285 struct drm_cmdline_mode *mode)
1286{
1287 const char *name;
1288 unsigned int namelen;
1289 bool res_specified = false, bpp_specified = false, refresh_specified = false;
1290 unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
1291 bool yres_specified = false, cvt = false, rb = false;
1292 bool interlace = false, margins = false, was_digit = false;
1293 int i;
1294 enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
1295
1296#ifdef CONFIG_FB
1297 if (!mode_option)
1298 mode_option = fb_mode_option;
1299#endif
1300
1301 if (!mode_option) {
1302 mode->specified = false;
1303 return false;
1304 }
1305
1306 name = mode_option;
1307 namelen = strlen(name);
1308 for (i = namelen-1; i >= 0; i--) {
1309 switch (name[i]) {
1310 case '@':
1311 if (!refresh_specified && !bpp_specified &&
1312 !yres_specified && !cvt && !rb && was_digit) {
1313 refresh = simple_strtol(&name[i+1], NULL, 10);
1314 refresh_specified = true;
1315 was_digit = false;
1316 } else
1317 goto done;
1318 break;
1319 case '-':
1320 if (!bpp_specified && !yres_specified && !cvt &&
1321 !rb && was_digit) {
1322 bpp = simple_strtol(&name[i+1], NULL, 10);
1323 bpp_specified = true;
1324 was_digit = false;
1325 } else
1326 goto done;
1327 break;
1328 case 'x':
1329 if (!yres_specified && was_digit) {
1330 yres = simple_strtol(&name[i+1], NULL, 10);
1331 yres_specified = true;
1332 was_digit = false;
1333 } else
1334 goto done;
1335 break;
1336 case '0' ... '9':
1337 was_digit = true;
1338 break;
1339 case 'M':
1340 if (yres_specified || cvt || was_digit)
1341 goto done;
1342 cvt = true;
1343 break;
1344 case 'R':
1345 if (yres_specified || cvt || rb || was_digit)
1346 goto done;
1347 rb = true;
1348 break;
1349 case 'm':
1350 if (cvt || yres_specified || was_digit)
1351 goto done;
1352 margins = true;
1353 break;
1354 case 'i':
1355 if (cvt || yres_specified || was_digit)
1356 goto done;
1357 interlace = true;
1358 break;
1359 case 'e':
1360 if (yres_specified || bpp_specified || refresh_specified ||
1361 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1362 goto done;
1363
1364 force = DRM_FORCE_ON;
1365 break;
1366 case 'D':
1367 if (yres_specified || bpp_specified || refresh_specified ||
1368 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1369 goto done;
1370
1371 if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1372 (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1373 force = DRM_FORCE_ON;
1374 else
1375 force = DRM_FORCE_ON_DIGITAL;
1376 break;
1377 case 'd':
1378 if (yres_specified || bpp_specified || refresh_specified ||
1379 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1380 goto done;
1381
1382 force = DRM_FORCE_OFF;
1383 break;
1384 default:
1385 goto done;
1386 }
1387 }
1388
1389 if (i < 0 && yres_specified) {
1390 char *ch;
1391 xres = simple_strtol(name, &ch, 10);
1392 if ((ch != NULL) && (*ch == 'x'))
1393 res_specified = true;
1394 else
1395 i = ch - name;
1396 } else if (!yres_specified && was_digit) {
1397 /* catch mode that begins with digits but has no 'x' */
1398 i = 0;
1399 }
1400done:
1401 if (i >= 0) {
1402 pr_warn("[drm] parse error at position %i in video mode '%s'\n",
1403 i, name);
1404 mode->specified = false;
1405 return false;
1406 }
1407
1408 if (res_specified) {
1409 mode->specified = true;
1410 mode->xres = xres;
1411 mode->yres = yres;
1412 }
1413
1414 if (refresh_specified) {
1415 mode->refresh_specified = true;
1416 mode->refresh = refresh;
1417 }
1418
1419 if (bpp_specified) {
1420 mode->bpp_specified = true;
1421 mode->bpp = bpp;
1422 }
1423 mode->rb = rb;
1424 mode->cvt = cvt;
1425 mode->interlace = interlace;
1426 mode->margins = margins;
1427 mode->force = force;
1428
1429 return true;
1430}
1431EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1432
1433/**
1434 * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
1435 * @dev: DRM device to create the new mode for
1436 * @cmd: input command line modeline
1437 *
1438 * Returns:
1439 * Pointer to converted mode on success, NULL on error.
1440 */
1441struct drm_display_mode *
1442drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1443 struct drm_cmdline_mode *cmd)
1444{
1445 struct drm_display_mode *mode;
1446
1447 if (cmd->cvt)
1448 mode = drm_cvt_mode(dev,
1449 cmd->xres, cmd->yres,
1450 cmd->refresh_specified ? cmd->refresh : 60,
1451 cmd->rb, cmd->interlace,
1452 cmd->margins);
1453 else
1454 mode = drm_gtf_mode(dev,
1455 cmd->xres, cmd->yres,
1456 cmd->refresh_specified ? cmd->refresh : 60,
1457 cmd->interlace,
1458 cmd->margins);
1459 if (!mode)
1460 return NULL;
1461
1462 mode->type |= DRM_MODE_TYPE_USERDEF;
1463 /* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
1464 if (cmd->xres == 1366 && mode->hdisplay == 1368) {
1465 mode->hdisplay = 1366;
1466 mode->hsync_start--;
1467 mode->hsync_end--;
1468 drm_mode_set_name(mode);
1469 }
1470 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1471 return mode;
1472}
1473EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
1474
1475/**
1476 * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo
1477 * @out: drm_mode_modeinfo struct to return to the user
1478 * @in: drm_display_mode to use
1479 *
1480 * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
1481 * the user.
1482 */
1483void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
1484 const struct drm_display_mode *in)
1485{
1486 WARN(in->hdisplay > USHRT_MAX || in->hsync_start > USHRT_MAX ||
1487 in->hsync_end > USHRT_MAX || in->htotal > USHRT_MAX ||
1488 in->hskew > USHRT_MAX || in->vdisplay > USHRT_MAX ||
1489 in->vsync_start > USHRT_MAX || in->vsync_end > USHRT_MAX ||
1490 in->vtotal > USHRT_MAX || in->vscan > USHRT_MAX,
1491 "timing values too large for mode info\n");
1492
1493 out->clock = in->clock;
1494 out->hdisplay = in->hdisplay;
1495 out->hsync_start = in->hsync_start;
1496 out->hsync_end = in->hsync_end;
1497 out->htotal = in->htotal;
1498 out->hskew = in->hskew;
1499 out->vdisplay = in->vdisplay;
1500 out->vsync_start = in->vsync_start;
1501 out->vsync_end = in->vsync_end;
1502 out->vtotal = in->vtotal;
1503 out->vscan = in->vscan;
1504 out->vrefresh = in->vrefresh;
1505 out->flags = in->flags;
1506 out->type = in->type;
1507 strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1508 out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1509}
1510
1511/**
1512 * drm_crtc_convert_umode - convert a modeinfo into a drm_display_mode
1513 * @out: drm_display_mode to return to the user
1514 * @in: drm_mode_modeinfo to use
1515 *
1516 * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
1517 * the caller.
1518 *
1519 * Returns:
1520 * Zero on success, negative errno on failure.
1521 */
1522int drm_mode_convert_umode(struct drm_display_mode *out,
1523 const struct drm_mode_modeinfo *in)
1524{
1525 int ret = -EINVAL;
1526
1527 if (in->clock > INT_MAX || in->vrefresh > INT_MAX) {
1528 ret = -ERANGE;
1529 goto out;
1530 }
1531
1532 if ((in->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1533 goto out;
1534
1535 out->clock = in->clock;
1536 out->hdisplay = in->hdisplay;
1537 out->hsync_start = in->hsync_start;
1538 out->hsync_end = in->hsync_end;
1539 out->htotal = in->htotal;
1540 out->hskew = in->hskew;
1541 out->vdisplay = in->vdisplay;
1542 out->vsync_start = in->vsync_start;
1543 out->vsync_end = in->vsync_end;
1544 out->vtotal = in->vtotal;
1545 out->vscan = in->vscan;
1546 out->vrefresh = in->vrefresh;
1547 out->flags = in->flags;
1548 out->type = in->type;
1549 strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1550 out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1551
1552 out->status = drm_mode_validate_basic(out);
1553 if (out->status != MODE_OK)
1554 goto out;
1555
1556 drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
1557
1558 ret = 0;
1559
1560out:
1561 return ret;
1562}
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 "drmP.h"
37#include "drm.h"
38#include "drm_crtc.h"
39
40/**
41 * drm_mode_debug_printmodeline - debug print a mode
42 * @dev: DRM device
43 * @mode: mode to print
44 *
45 * LOCKING:
46 * None.
47 *
48 * Describe @mode using DRM_DEBUG.
49 */
50void drm_mode_debug_printmodeline(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_cvt_mode -create a modeline based on CVT algorithm
64 * @dev: DRM device
65 * @hdisplay: hdisplay size
66 * @vdisplay: vdisplay size
67 * @vrefresh : vrefresh rate
68 * @reduced : Whether the GTF calculation is simplified
69 * @interlaced:Whether the interlace is supported
70 *
71 * LOCKING:
72 * none.
73 *
74 * return the modeline based on CVT algorithm
75 *
76 * This function is called to generate the modeline based on CVT algorithm
77 * according to the hdisplay, vdisplay, vrefresh.
78 * It is based from the VESA(TM) Coordinated Video Timing Generator by
79 * Graham Loveridge April 9, 2003 available at
80 * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
81 *
82 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
83 * What I have done is to translate it by using integer calculation.
84 */
85#define HV_FACTOR 1000
86struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
87 int vdisplay, int vrefresh,
88 bool reduced, bool interlaced, bool margins)
89{
90 /* 1) top/bottom margin size (% of height) - default: 1.8, */
91#define CVT_MARGIN_PERCENTAGE 18
92 /* 2) character cell horizontal granularity (pixels) - default 8 */
93#define CVT_H_GRANULARITY 8
94 /* 3) Minimum vertical porch (lines) - default 3 */
95#define CVT_MIN_V_PORCH 3
96 /* 4) Minimum number of vertical back porch lines - default 6 */
97#define CVT_MIN_V_BPORCH 6
98 /* Pixel Clock step (kHz) */
99#define CVT_CLOCK_STEP 250
100 struct drm_display_mode *drm_mode;
101 unsigned int vfieldrate, hperiod;
102 int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
103 int interlace;
104
105 /* allocate the drm_display_mode structure. If failure, we will
106 * return directly
107 */
108 drm_mode = drm_mode_create(dev);
109 if (!drm_mode)
110 return NULL;
111
112 /* the CVT default refresh rate is 60Hz */
113 if (!vrefresh)
114 vrefresh = 60;
115
116 /* the required field fresh rate */
117 if (interlaced)
118 vfieldrate = vrefresh * 2;
119 else
120 vfieldrate = vrefresh;
121
122 /* horizontal pixels */
123 hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
124
125 /* determine the left&right borders */
126 hmargin = 0;
127 if (margins) {
128 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
129 hmargin -= hmargin % CVT_H_GRANULARITY;
130 }
131 /* find the total active pixels */
132 drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
133
134 /* find the number of lines per field */
135 if (interlaced)
136 vdisplay_rnd = vdisplay / 2;
137 else
138 vdisplay_rnd = vdisplay;
139
140 /* find the top & bottom borders */
141 vmargin = 0;
142 if (margins)
143 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
144
145 drm_mode->vdisplay = vdisplay + 2 * vmargin;
146
147 /* Interlaced */
148 if (interlaced)
149 interlace = 1;
150 else
151 interlace = 0;
152
153 /* Determine VSync Width from aspect ratio */
154 if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
155 vsync = 4;
156 else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
157 vsync = 5;
158 else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
159 vsync = 6;
160 else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
161 vsync = 7;
162 else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
163 vsync = 7;
164 else /* custom */
165 vsync = 10;
166
167 if (!reduced) {
168 /* simplify the GTF calculation */
169 /* 4) Minimum time of vertical sync + back porch interval (µs)
170 * default 550.0
171 */
172 int tmp1, tmp2;
173#define CVT_MIN_VSYNC_BP 550
174 /* 3) Nominal HSync width (% of line period) - default 8 */
175#define CVT_HSYNC_PERCENTAGE 8
176 unsigned int hblank_percentage;
177 int vsyncandback_porch, vback_porch, hblank;
178
179 /* estimated the horizontal period */
180 tmp1 = HV_FACTOR * 1000000 -
181 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
182 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
183 interlace;
184 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
185
186 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
187 /* 9. Find number of lines in sync + backporch */
188 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
189 vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
190 else
191 vsyncandback_porch = tmp1;
192 /* 10. Find number of lines in back porch */
193 vback_porch = vsyncandback_porch - vsync;
194 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
195 vsyncandback_porch + CVT_MIN_V_PORCH;
196 /* 5) Definition of Horizontal blanking time limitation */
197 /* Gradient (%/kHz) - default 600 */
198#define CVT_M_FACTOR 600
199 /* Offset (%) - default 40 */
200#define CVT_C_FACTOR 40
201 /* Blanking time scaling factor - default 128 */
202#define CVT_K_FACTOR 128
203 /* Scaling factor weighting - default 20 */
204#define CVT_J_FACTOR 20
205#define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256)
206#define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
207 CVT_J_FACTOR)
208 /* 12. Find ideal blanking duty cycle from formula */
209 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
210 hperiod / 1000;
211 /* 13. Blanking time */
212 if (hblank_percentage < 20 * HV_FACTOR)
213 hblank_percentage = 20 * HV_FACTOR;
214 hblank = drm_mode->hdisplay * hblank_percentage /
215 (100 * HV_FACTOR - hblank_percentage);
216 hblank -= hblank % (2 * CVT_H_GRANULARITY);
217 /* 14. find the total pixes per line */
218 drm_mode->htotal = drm_mode->hdisplay + hblank;
219 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
220 drm_mode->hsync_start = drm_mode->hsync_end -
221 (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
222 drm_mode->hsync_start += CVT_H_GRANULARITY -
223 drm_mode->hsync_start % CVT_H_GRANULARITY;
224 /* fill the Vsync values */
225 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
226 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
227 } else {
228 /* Reduced blanking */
229 /* Minimum vertical blanking interval time (µs)- default 460 */
230#define CVT_RB_MIN_VBLANK 460
231 /* Fixed number of clocks for horizontal sync */
232#define CVT_RB_H_SYNC 32
233 /* Fixed number of clocks for horizontal blanking */
234#define CVT_RB_H_BLANK 160
235 /* Fixed number of lines for vertical front porch - default 3*/
236#define CVT_RB_VFPORCH 3
237 int vbilines;
238 int tmp1, tmp2;
239 /* 8. Estimate Horizontal period. */
240 tmp1 = HV_FACTOR * 1000000 -
241 CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
242 tmp2 = vdisplay_rnd + 2 * vmargin;
243 hperiod = tmp1 / (tmp2 * vfieldrate);
244 /* 9. Find number of lines in vertical blanking */
245 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
246 /* 10. Check if vertical blanking is sufficient */
247 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
248 vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
249 /* 11. Find total number of lines in vertical field */
250 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
251 /* 12. Find total number of pixels in a line */
252 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
253 /* Fill in HSync values */
254 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
255 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
256 /* Fill in VSync values */
257 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
258 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
259 }
260 /* 15/13. Find pixel clock frequency (kHz for xf86) */
261 drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;
262 drm_mode->clock -= drm_mode->clock % CVT_CLOCK_STEP;
263 /* 18/16. Find actual vertical frame frequency */
264 /* ignore - just set the mode flag for interlaced */
265 if (interlaced) {
266 drm_mode->vtotal *= 2;
267 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
268 }
269 /* Fill the mode line name */
270 drm_mode_set_name(drm_mode);
271 if (reduced)
272 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
273 DRM_MODE_FLAG_NVSYNC);
274 else
275 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
276 DRM_MODE_FLAG_NHSYNC);
277
278 return drm_mode;
279}
280EXPORT_SYMBOL(drm_cvt_mode);
281
282/**
283 * drm_gtf_mode_complex - create the modeline based on full GTF algorithm
284 *
285 * @dev :drm device
286 * @hdisplay :hdisplay size
287 * @vdisplay :vdisplay size
288 * @vrefresh :vrefresh rate.
289 * @interlaced :whether the interlace is supported
290 * @margins :desired margin size
291 * @GTF_[MCKJ] :extended GTF formula parameters
292 *
293 * LOCKING.
294 * none.
295 *
296 * return the modeline based on full GTF algorithm.
297 *
298 * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
299 * in here multiplied by two. For a C of 40, pass in 80.
300 */
301struct drm_display_mode *
302drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
303 int vrefresh, bool interlaced, int margins,
304 int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
305{ /* 1) top/bottom margin size (% of height) - default: 1.8, */
306#define GTF_MARGIN_PERCENTAGE 18
307 /* 2) character cell horizontal granularity (pixels) - default 8 */
308#define GTF_CELL_GRAN 8
309 /* 3) Minimum vertical porch (lines) - default 3 */
310#define GTF_MIN_V_PORCH 1
311 /* width of vsync in lines */
312#define V_SYNC_RQD 3
313 /* width of hsync as % of total line */
314#define H_SYNC_PERCENT 8
315 /* min time of vsync + back porch (microsec) */
316#define MIN_VSYNC_PLUS_BP 550
317 /* C' and M' are part of the Blanking Duty Cycle computation */
318#define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
319#define GTF_M_PRIME (GTF_K * GTF_M / 256)
320 struct drm_display_mode *drm_mode;
321 unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
322 int top_margin, bottom_margin;
323 int interlace;
324 unsigned int hfreq_est;
325 int vsync_plus_bp, vback_porch;
326 unsigned int vtotal_lines, vfieldrate_est, hperiod;
327 unsigned int vfield_rate, vframe_rate;
328 int left_margin, right_margin;
329 unsigned int total_active_pixels, ideal_duty_cycle;
330 unsigned int hblank, total_pixels, pixel_freq;
331 int hsync, hfront_porch, vodd_front_porch_lines;
332 unsigned int tmp1, tmp2;
333
334 drm_mode = drm_mode_create(dev);
335 if (!drm_mode)
336 return NULL;
337
338 /* 1. In order to give correct results, the number of horizontal
339 * pixels requested is first processed to ensure that it is divisible
340 * by the character size, by rounding it to the nearest character
341 * cell boundary:
342 */
343 hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
344 hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
345
346 /* 2. If interlace is requested, the number of vertical lines assumed
347 * by the calculation must be halved, as the computation calculates
348 * the number of vertical lines per field.
349 */
350 if (interlaced)
351 vdisplay_rnd = vdisplay / 2;
352 else
353 vdisplay_rnd = vdisplay;
354
355 /* 3. Find the frame rate required: */
356 if (interlaced)
357 vfieldrate_rqd = vrefresh * 2;
358 else
359 vfieldrate_rqd = vrefresh;
360
361 /* 4. Find number of lines in Top margin: */
362 top_margin = 0;
363 if (margins)
364 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
365 1000;
366 /* 5. Find number of lines in bottom margin: */
367 bottom_margin = top_margin;
368
369 /* 6. If interlace is required, then set variable interlace: */
370 if (interlaced)
371 interlace = 1;
372 else
373 interlace = 0;
374
375 /* 7. Estimate the Horizontal frequency */
376 {
377 tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
378 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
379 2 + interlace;
380 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
381 }
382
383 /* 8. Find the number of lines in V sync + back porch */
384 /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
385 vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
386 vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
387 /* 9. Find the number of lines in V back porch alone: */
388 vback_porch = vsync_plus_bp - V_SYNC_RQD;
389 /* 10. Find the total number of lines in Vertical field period: */
390 vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
391 vsync_plus_bp + GTF_MIN_V_PORCH;
392 /* 11. Estimate the Vertical field frequency: */
393 vfieldrate_est = hfreq_est / vtotal_lines;
394 /* 12. Find the actual horizontal period: */
395 hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
396
397 /* 13. Find the actual Vertical field frequency: */
398 vfield_rate = hfreq_est / vtotal_lines;
399 /* 14. Find the Vertical frame frequency: */
400 if (interlaced)
401 vframe_rate = vfield_rate / 2;
402 else
403 vframe_rate = vfield_rate;
404 /* 15. Find number of pixels in left margin: */
405 if (margins)
406 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
407 1000;
408 else
409 left_margin = 0;
410
411 /* 16.Find number of pixels in right margin: */
412 right_margin = left_margin;
413 /* 17.Find total number of active pixels in image and left and right */
414 total_active_pixels = hdisplay_rnd + left_margin + right_margin;
415 /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
416 ideal_duty_cycle = GTF_C_PRIME * 1000 -
417 (GTF_M_PRIME * 1000000 / hfreq_est);
418 /* 19.Find the number of pixels in the blanking time to the nearest
419 * double character cell: */
420 hblank = total_active_pixels * ideal_duty_cycle /
421 (100000 - ideal_duty_cycle);
422 hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
423 hblank = hblank * 2 * GTF_CELL_GRAN;
424 /* 20.Find total number of pixels: */
425 total_pixels = total_active_pixels + hblank;
426 /* 21.Find pixel clock frequency: */
427 pixel_freq = total_pixels * hfreq_est / 1000;
428 /* Stage 1 computations are now complete; I should really pass
429 * the results to another function and do the Stage 2 computations,
430 * but I only need a few more values so I'll just append the
431 * computations here for now */
432 /* 17. Find the number of pixels in the horizontal sync period: */
433 hsync = H_SYNC_PERCENT * total_pixels / 100;
434 hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
435 hsync = hsync * GTF_CELL_GRAN;
436 /* 18. Find the number of pixels in horizontal front porch period */
437 hfront_porch = hblank / 2 - hsync;
438 /* 36. Find the number of lines in the odd front porch period: */
439 vodd_front_porch_lines = GTF_MIN_V_PORCH ;
440
441 /* finally, pack the results in the mode struct */
442 drm_mode->hdisplay = hdisplay_rnd;
443 drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
444 drm_mode->hsync_end = drm_mode->hsync_start + hsync;
445 drm_mode->htotal = total_pixels;
446 drm_mode->vdisplay = vdisplay_rnd;
447 drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
448 drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
449 drm_mode->vtotal = vtotal_lines;
450
451 drm_mode->clock = pixel_freq;
452
453 if (interlaced) {
454 drm_mode->vtotal *= 2;
455 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
456 }
457
458 drm_mode_set_name(drm_mode);
459 if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
460 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
461 else
462 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
463
464 return drm_mode;
465}
466EXPORT_SYMBOL(drm_gtf_mode_complex);
467
468/**
469 * drm_gtf_mode - create the modeline based on GTF algorithm
470 *
471 * @dev :drm device
472 * @hdisplay :hdisplay size
473 * @vdisplay :vdisplay size
474 * @vrefresh :vrefresh rate.
475 * @interlaced :whether the interlace is supported
476 * @margins :whether the margin is supported
477 *
478 * LOCKING.
479 * none.
480 *
481 * return the modeline based on GTF algorithm
482 *
483 * This function is to create the modeline based on the GTF algorithm.
484 * Generalized Timing Formula is derived from:
485 * GTF Spreadsheet by Andy Morrish (1/5/97)
486 * available at http://www.vesa.org
487 *
488 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
489 * What I have done is to translate it by using integer calculation.
490 * I also refer to the function of fb_get_mode in the file of
491 * drivers/video/fbmon.c
492 *
493 * Standard GTF parameters:
494 * M = 600
495 * C = 40
496 * K = 128
497 * J = 20
498 */
499struct drm_display_mode *
500drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
501 bool lace, int margins)
502{
503 return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh, lace,
504 margins, 600, 40 * 2, 128, 20 * 2);
505}
506EXPORT_SYMBOL(drm_gtf_mode);
507
508/**
509 * drm_mode_set_name - set the name on a mode
510 * @mode: name will be set in this mode
511 *
512 * LOCKING:
513 * None.
514 *
515 * Set the name of @mode to a standard format.
516 */
517void drm_mode_set_name(struct drm_display_mode *mode)
518{
519 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
520
521 snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
522 mode->hdisplay, mode->vdisplay,
523 interlaced ? "i" : "");
524}
525EXPORT_SYMBOL(drm_mode_set_name);
526
527/**
528 * drm_mode_list_concat - move modes from one list to another
529 * @head: source list
530 * @new: dst list
531 *
532 * LOCKING:
533 * Caller must ensure both lists are locked.
534 *
535 * Move all the modes from @head to @new.
536 */
537void drm_mode_list_concat(struct list_head *head, struct list_head *new)
538{
539
540 struct list_head *entry, *tmp;
541
542 list_for_each_safe(entry, tmp, head) {
543 list_move_tail(entry, new);
544 }
545}
546EXPORT_SYMBOL(drm_mode_list_concat);
547
548/**
549 * drm_mode_width - get the width of a mode
550 * @mode: mode
551 *
552 * LOCKING:
553 * None.
554 *
555 * Return @mode's width (hdisplay) value.
556 *
557 * FIXME: is this needed?
558 *
559 * RETURNS:
560 * @mode->hdisplay
561 */
562int drm_mode_width(struct drm_display_mode *mode)
563{
564 return mode->hdisplay;
565
566}
567EXPORT_SYMBOL(drm_mode_width);
568
569/**
570 * drm_mode_height - get the height of a mode
571 * @mode: mode
572 *
573 * LOCKING:
574 * None.
575 *
576 * Return @mode's height (vdisplay) value.
577 *
578 * FIXME: is this needed?
579 *
580 * RETURNS:
581 * @mode->vdisplay
582 */
583int drm_mode_height(struct drm_display_mode *mode)
584{
585 return mode->vdisplay;
586}
587EXPORT_SYMBOL(drm_mode_height);
588
589/** drm_mode_hsync - get the hsync of a mode
590 * @mode: mode
591 *
592 * LOCKING:
593 * None.
594 *
595 * Return @modes's hsync rate in kHz, rounded to the nearest int.
596 */
597int drm_mode_hsync(const struct drm_display_mode *mode)
598{
599 unsigned int calc_val;
600
601 if (mode->hsync)
602 return mode->hsync;
603
604 if (mode->htotal < 0)
605 return 0;
606
607 calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
608 calc_val += 500; /* round to 1000Hz */
609 calc_val /= 1000; /* truncate to kHz */
610
611 return calc_val;
612}
613EXPORT_SYMBOL(drm_mode_hsync);
614
615/**
616 * drm_mode_vrefresh - get the vrefresh of a mode
617 * @mode: mode
618 *
619 * LOCKING:
620 * None.
621 *
622 * Return @mode's vrefresh rate in Hz or calculate it if necessary.
623 *
624 * FIXME: why is this needed? shouldn't vrefresh be set already?
625 *
626 * RETURNS:
627 * Vertical refresh rate. It will be the result of actual value plus 0.5.
628 * If it is 70.288, it will return 70Hz.
629 * If it is 59.6, it will return 60Hz.
630 */
631int drm_mode_vrefresh(const struct drm_display_mode *mode)
632{
633 int refresh = 0;
634 unsigned int calc_val;
635
636 if (mode->vrefresh > 0)
637 refresh = mode->vrefresh;
638 else if (mode->htotal > 0 && mode->vtotal > 0) {
639 int vtotal;
640 vtotal = mode->vtotal;
641 /* work out vrefresh the value will be x1000 */
642 calc_val = (mode->clock * 1000);
643 calc_val /= mode->htotal;
644 refresh = (calc_val + vtotal / 2) / vtotal;
645
646 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
647 refresh *= 2;
648 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
649 refresh /= 2;
650 if (mode->vscan > 1)
651 refresh /= mode->vscan;
652 }
653 return refresh;
654}
655EXPORT_SYMBOL(drm_mode_vrefresh);
656
657/**
658 * drm_mode_set_crtcinfo - set CRTC modesetting parameters
659 * @p: mode
660 * @adjust_flags: unused? (FIXME)
661 *
662 * LOCKING:
663 * None.
664 *
665 * Setup the CRTC modesetting parameters for @p, adjusting if necessary.
666 */
667void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
668{
669 if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
670 return;
671
672 p->crtc_hdisplay = p->hdisplay;
673 p->crtc_hsync_start = p->hsync_start;
674 p->crtc_hsync_end = p->hsync_end;
675 p->crtc_htotal = p->htotal;
676 p->crtc_hskew = p->hskew;
677 p->crtc_vdisplay = p->vdisplay;
678 p->crtc_vsync_start = p->vsync_start;
679 p->crtc_vsync_end = p->vsync_end;
680 p->crtc_vtotal = p->vtotal;
681
682 if (p->flags & DRM_MODE_FLAG_INTERLACE) {
683 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
684 p->crtc_vdisplay /= 2;
685 p->crtc_vsync_start /= 2;
686 p->crtc_vsync_end /= 2;
687 p->crtc_vtotal /= 2;
688 }
689 }
690
691 if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
692 p->crtc_vdisplay *= 2;
693 p->crtc_vsync_start *= 2;
694 p->crtc_vsync_end *= 2;
695 p->crtc_vtotal *= 2;
696 }
697
698 if (p->vscan > 1) {
699 p->crtc_vdisplay *= p->vscan;
700 p->crtc_vsync_start *= p->vscan;
701 p->crtc_vsync_end *= p->vscan;
702 p->crtc_vtotal *= p->vscan;
703 }
704
705 p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
706 p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
707 p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
708 p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
709
710 p->crtc_hadjusted = false;
711 p->crtc_vadjusted = false;
712}
713EXPORT_SYMBOL(drm_mode_set_crtcinfo);
714
715
716/**
717 * drm_mode_copy - copy the mode
718 * @dst: mode to overwrite
719 * @src: mode to copy
720 *
721 * LOCKING:
722 * None.
723 *
724 * Copy an existing mode into another mode, preserving the object id
725 * of the destination mode.
726 */
727void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
728{
729 int id = dst->base.id;
730
731 *dst = *src;
732 dst->base.id = id;
733 INIT_LIST_HEAD(&dst->head);
734}
735EXPORT_SYMBOL(drm_mode_copy);
736
737/**
738 * drm_mode_duplicate - allocate and duplicate an existing mode
739 * @m: mode to duplicate
740 *
741 * LOCKING:
742 * None.
743 *
744 * Just allocate a new mode, copy the existing mode into it, and return
745 * a pointer to it. Used to create new instances of established modes.
746 */
747struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
748 const struct drm_display_mode *mode)
749{
750 struct drm_display_mode *nmode;
751
752 nmode = drm_mode_create(dev);
753 if (!nmode)
754 return NULL;
755
756 drm_mode_copy(nmode, mode);
757
758 return nmode;
759}
760EXPORT_SYMBOL(drm_mode_duplicate);
761
762/**
763 * drm_mode_equal - test modes for equality
764 * @mode1: first mode
765 * @mode2: second mode
766 *
767 * LOCKING:
768 * None.
769 *
770 * Check to see if @mode1 and @mode2 are equivalent.
771 *
772 * RETURNS:
773 * True if the modes are equal, false otherwise.
774 */
775bool drm_mode_equal(struct drm_display_mode *mode1, struct drm_display_mode *mode2)
776{
777 /* do clock check convert to PICOS so fb modes get matched
778 * the same */
779 if (mode1->clock && mode2->clock) {
780 if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
781 return false;
782 } else if (mode1->clock != mode2->clock)
783 return false;
784
785 if (mode1->hdisplay == mode2->hdisplay &&
786 mode1->hsync_start == mode2->hsync_start &&
787 mode1->hsync_end == mode2->hsync_end &&
788 mode1->htotal == mode2->htotal &&
789 mode1->hskew == mode2->hskew &&
790 mode1->vdisplay == mode2->vdisplay &&
791 mode1->vsync_start == mode2->vsync_start &&
792 mode1->vsync_end == mode2->vsync_end &&
793 mode1->vtotal == mode2->vtotal &&
794 mode1->vscan == mode2->vscan &&
795 mode1->flags == mode2->flags)
796 return true;
797
798 return false;
799}
800EXPORT_SYMBOL(drm_mode_equal);
801
802/**
803 * drm_mode_validate_size - make sure modes adhere to size constraints
804 * @dev: DRM device
805 * @mode_list: list of modes to check
806 * @maxX: maximum width
807 * @maxY: maximum height
808 * @maxPitch: max pitch
809 *
810 * LOCKING:
811 * Caller must hold a lock protecting @mode_list.
812 *
813 * The DRM device (@dev) has size and pitch limits. Here we validate the
814 * modes we probed for @dev against those limits and set their status as
815 * necessary.
816 */
817void drm_mode_validate_size(struct drm_device *dev,
818 struct list_head *mode_list,
819 int maxX, int maxY, int maxPitch)
820{
821 struct drm_display_mode *mode;
822
823 list_for_each_entry(mode, mode_list, head) {
824 if (maxPitch > 0 && mode->hdisplay > maxPitch)
825 mode->status = MODE_BAD_WIDTH;
826
827 if (maxX > 0 && mode->hdisplay > maxX)
828 mode->status = MODE_VIRTUAL_X;
829
830 if (maxY > 0 && mode->vdisplay > maxY)
831 mode->status = MODE_VIRTUAL_Y;
832 }
833}
834EXPORT_SYMBOL(drm_mode_validate_size);
835
836/**
837 * drm_mode_validate_clocks - validate modes against clock limits
838 * @dev: DRM device
839 * @mode_list: list of modes to check
840 * @min: minimum clock rate array
841 * @max: maximum clock rate array
842 * @n_ranges: number of clock ranges (size of arrays)
843 *
844 * LOCKING:
845 * Caller must hold a lock protecting @mode_list.
846 *
847 * Some code may need to check a mode list against the clock limits of the
848 * device in question. This function walks the mode list, testing to make
849 * sure each mode falls within a given range (defined by @min and @max
850 * arrays) and sets @mode->status as needed.
851 */
852void drm_mode_validate_clocks(struct drm_device *dev,
853 struct list_head *mode_list,
854 int *min, int *max, int n_ranges)
855{
856 struct drm_display_mode *mode;
857 int i;
858
859 list_for_each_entry(mode, mode_list, head) {
860 bool good = false;
861 for (i = 0; i < n_ranges; i++) {
862 if (mode->clock >= min[i] && mode->clock <= max[i]) {
863 good = true;
864 break;
865 }
866 }
867 if (!good)
868 mode->status = MODE_CLOCK_RANGE;
869 }
870}
871EXPORT_SYMBOL(drm_mode_validate_clocks);
872
873/**
874 * drm_mode_prune_invalid - remove invalid modes from mode list
875 * @dev: DRM device
876 * @mode_list: list of modes to check
877 * @verbose: be verbose about it
878 *
879 * LOCKING:
880 * Caller must hold a lock protecting @mode_list.
881 *
882 * Once mode list generation is complete, a caller can use this routine to
883 * remove invalid modes from a mode list. If any of the modes have a
884 * status other than %MODE_OK, they are removed from @mode_list and freed.
885 */
886void drm_mode_prune_invalid(struct drm_device *dev,
887 struct list_head *mode_list, bool verbose)
888{
889 struct drm_display_mode *mode, *t;
890
891 list_for_each_entry_safe(mode, t, mode_list, head) {
892 if (mode->status != MODE_OK) {
893 list_del(&mode->head);
894 if (verbose) {
895 drm_mode_debug_printmodeline(mode);
896 DRM_DEBUG_KMS("Not using %s mode %d\n",
897 mode->name, mode->status);
898 }
899 drm_mode_destroy(dev, mode);
900 }
901 }
902}
903EXPORT_SYMBOL(drm_mode_prune_invalid);
904
905/**
906 * drm_mode_compare - compare modes for favorability
907 * @priv: unused
908 * @lh_a: list_head for first mode
909 * @lh_b: list_head for second mode
910 *
911 * LOCKING:
912 * None.
913 *
914 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
915 * which is better.
916 *
917 * RETURNS:
918 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
919 * positive if @lh_b is better than @lh_a.
920 */
921static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
922{
923 struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
924 struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
925 int diff;
926
927 diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
928 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
929 if (diff)
930 return diff;
931 diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
932 if (diff)
933 return diff;
934 diff = b->clock - a->clock;
935 return diff;
936}
937
938/**
939 * drm_mode_sort - sort mode list
940 * @mode_list: list to sort
941 *
942 * LOCKING:
943 * Caller must hold a lock protecting @mode_list.
944 *
945 * Sort @mode_list by favorability, putting good modes first.
946 */
947void drm_mode_sort(struct list_head *mode_list)
948{
949 list_sort(NULL, mode_list, drm_mode_compare);
950}
951EXPORT_SYMBOL(drm_mode_sort);
952
953/**
954 * drm_mode_connector_list_update - update the mode list for the connector
955 * @connector: the connector to update
956 *
957 * LOCKING:
958 * Caller must hold a lock protecting @mode_list.
959 *
960 * This moves the modes from the @connector probed_modes list
961 * to the actual mode list. It compares the probed mode against the current
962 * list and only adds different modes. All modes unverified after this point
963 * will be removed by the prune invalid modes.
964 */
965void drm_mode_connector_list_update(struct drm_connector *connector)
966{
967 struct drm_display_mode *mode;
968 struct drm_display_mode *pmode, *pt;
969 int found_it;
970
971 list_for_each_entry_safe(pmode, pt, &connector->probed_modes,
972 head) {
973 found_it = 0;
974 /* go through current modes checking for the new probed mode */
975 list_for_each_entry(mode, &connector->modes, head) {
976 if (drm_mode_equal(pmode, mode)) {
977 found_it = 1;
978 /* if equal delete the probed mode */
979 mode->status = pmode->status;
980 /* Merge type bits together */
981 mode->type |= pmode->type;
982 list_del(&pmode->head);
983 drm_mode_destroy(connector->dev, pmode);
984 break;
985 }
986 }
987
988 if (!found_it) {
989 list_move_tail(&pmode->head, &connector->modes);
990 }
991 }
992}
993EXPORT_SYMBOL(drm_mode_connector_list_update);
994
995/**
996 * drm_mode_parse_command_line_for_connector - parse command line for connector
997 * @mode_option - per connector mode option
998 * @connector - connector to parse line for
999 *
1000 * This parses the connector specific then generic command lines for
1001 * modes and options to configure the connector.
1002 *
1003 * This uses the same parameters as the fb modedb.c, except for extra
1004 * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1005 *
1006 * enable/enable Digital/disable bit at the end
1007 */
1008bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1009 struct drm_connector *connector,
1010 struct drm_cmdline_mode *mode)
1011{
1012 const char *name;
1013 unsigned int namelen;
1014 bool res_specified = false, bpp_specified = false, refresh_specified = false;
1015 unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
1016 bool yres_specified = false, cvt = false, rb = false;
1017 bool interlace = false, margins = false, was_digit = false;
1018 int i;
1019 enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
1020
1021#ifdef CONFIG_FB
1022 if (!mode_option)
1023 mode_option = fb_mode_option;
1024#endif
1025
1026 if (!mode_option) {
1027 mode->specified = false;
1028 return false;
1029 }
1030
1031 name = mode_option;
1032 namelen = strlen(name);
1033 for (i = namelen-1; i >= 0; i--) {
1034 switch (name[i]) {
1035 case '@':
1036 if (!refresh_specified && !bpp_specified &&
1037 !yres_specified && !cvt && !rb && was_digit) {
1038 refresh = simple_strtol(&name[i+1], NULL, 10);
1039 refresh_specified = true;
1040 was_digit = false;
1041 } else
1042 goto done;
1043 break;
1044 case '-':
1045 if (!bpp_specified && !yres_specified && !cvt &&
1046 !rb && was_digit) {
1047 bpp = simple_strtol(&name[i+1], NULL, 10);
1048 bpp_specified = true;
1049 was_digit = false;
1050 } else
1051 goto done;
1052 break;
1053 case 'x':
1054 if (!yres_specified && was_digit) {
1055 yres = simple_strtol(&name[i+1], NULL, 10);
1056 yres_specified = true;
1057 was_digit = false;
1058 } else
1059 goto done;
1060 case '0' ... '9':
1061 was_digit = true;
1062 break;
1063 case 'M':
1064 if (yres_specified || cvt || was_digit)
1065 goto done;
1066 cvt = true;
1067 break;
1068 case 'R':
1069 if (yres_specified || cvt || rb || was_digit)
1070 goto done;
1071 rb = true;
1072 break;
1073 case 'm':
1074 if (cvt || yres_specified || was_digit)
1075 goto done;
1076 margins = true;
1077 break;
1078 case 'i':
1079 if (cvt || yres_specified || was_digit)
1080 goto done;
1081 interlace = true;
1082 break;
1083 case 'e':
1084 if (yres_specified || bpp_specified || refresh_specified ||
1085 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1086 goto done;
1087
1088 force = DRM_FORCE_ON;
1089 break;
1090 case 'D':
1091 if (yres_specified || bpp_specified || refresh_specified ||
1092 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1093 goto done;
1094
1095 if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1096 (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1097 force = DRM_FORCE_ON;
1098 else
1099 force = DRM_FORCE_ON_DIGITAL;
1100 break;
1101 case 'd':
1102 if (yres_specified || bpp_specified || refresh_specified ||
1103 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1104 goto done;
1105
1106 force = DRM_FORCE_OFF;
1107 break;
1108 default:
1109 goto done;
1110 }
1111 }
1112
1113 if (i < 0 && yres_specified) {
1114 char *ch;
1115 xres = simple_strtol(name, &ch, 10);
1116 if ((ch != NULL) && (*ch == 'x'))
1117 res_specified = true;
1118 else
1119 i = ch - name;
1120 } else if (!yres_specified && was_digit) {
1121 /* catch mode that begins with digits but has no 'x' */
1122 i = 0;
1123 }
1124done:
1125 if (i >= 0) {
1126 printk(KERN_WARNING
1127 "parse error at position %i in video mode '%s'\n",
1128 i, name);
1129 mode->specified = false;
1130 return false;
1131 }
1132
1133 if (res_specified) {
1134 mode->specified = true;
1135 mode->xres = xres;
1136 mode->yres = yres;
1137 }
1138
1139 if (refresh_specified) {
1140 mode->refresh_specified = true;
1141 mode->refresh = refresh;
1142 }
1143
1144 if (bpp_specified) {
1145 mode->bpp_specified = true;
1146 mode->bpp = bpp;
1147 }
1148 mode->rb = rb;
1149 mode->cvt = cvt;
1150 mode->interlace = interlace;
1151 mode->margins = margins;
1152 mode->force = force;
1153
1154 return true;
1155}
1156EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1157
1158struct drm_display_mode *
1159drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1160 struct drm_cmdline_mode *cmd)
1161{
1162 struct drm_display_mode *mode;
1163
1164 if (cmd->cvt)
1165 mode = drm_cvt_mode(dev,
1166 cmd->xres, cmd->yres,
1167 cmd->refresh_specified ? cmd->refresh : 60,
1168 cmd->rb, cmd->interlace,
1169 cmd->margins);
1170 else
1171 mode = drm_gtf_mode(dev,
1172 cmd->xres, cmd->yres,
1173 cmd->refresh_specified ? cmd->refresh : 60,
1174 cmd->interlace,
1175 cmd->margins);
1176 if (!mode)
1177 return NULL;
1178
1179 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1180 return mode;
1181}
1182EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);