1/*
2 * Copyright © 1997-2003 by The XFree86 Project, Inc.
3 * Copyright © 2007 Dave Airlie
4 * Copyright © 2007-2008 Intel Corporation
5 * Jesse Barnes <jesse.barnes@intel.com>
6 * Copyright 2005-2006 Luc Verhaegen
7 * Copyright (c) 2001, Andy Ritger aritger@nvidia.com
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
26 *
27 * Except as contained in this notice, the name of the copyright holder(s)
28 * and author(s) shall not be used in advertising or otherwise to promote
29 * the sale, use or other dealings in this Software without prior written
30 * authorization from the copyright holder(s) and author(s).
31 */
32
33#include <linux/ctype.h>
34#include <linux/list.h>
35#include <linux/list_sort.h>
36#include <linux/export.h>
37#include <linux/fb.h>
38
39#include <video/of_display_timing.h>
40#include <video/of_videomode.h>
41#include <video/videomode.h>
42
43#include <drm/drm_crtc.h>
44#include <drm/drm_device.h>
45#include <drm/drm_edid.h>
46#include <drm/drm_modes.h>
47#include <drm/drm_print.h>
48
49#include "drm_crtc_internal.h"
50
51/**
52 * drm_mode_debug_printmodeline - print a mode to dmesg
53 * @mode: mode to print
54 *
55 * Describe @mode using DRM_DEBUG.
56 */
57void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
58{
59 DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
60}
61EXPORT_SYMBOL(drm_mode_debug_printmodeline);
62
63/**
64 * drm_mode_create - create a new display mode
65 * @dev: DRM device
66 *
67 * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
68 * and return it.
69 *
70 * Returns:
71 * Pointer to new mode on success, NULL on error.
72 */
73struct drm_display_mode *drm_mode_create(struct drm_device *dev)
74{
75 struct drm_display_mode *nmode;
76
77 nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
78 if (!nmode)
79 return NULL;
80
81 return nmode;
82}
83EXPORT_SYMBOL(drm_mode_create);
84
85/**
86 * drm_mode_destroy - remove a mode
87 * @dev: DRM device
88 * @mode: mode to remove
89 *
90 * Release @mode's unique ID, then free it @mode structure itself using kfree.
91 */
92void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
93{
94 if (!mode)
95 return;
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 if (!hdisplay || !vdisplay)
165 return NULL;
166
167 /* allocate the drm_display_mode structure. If failure, we will
168 * return directly
169 */
170 drm_mode = drm_mode_create(dev);
171 if (!drm_mode)
172 return NULL;
173
174 /* the CVT default refresh rate is 60Hz */
175 if (!vrefresh)
176 vrefresh = 60;
177
178 /* the required field fresh rate */
179 if (interlaced)
180 vfieldrate = vrefresh * 2;
181 else
182 vfieldrate = vrefresh;
183
184 /* horizontal pixels */
185 hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
186
187 /* determine the left&right borders */
188 hmargin = 0;
189 if (margins) {
190 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
191 hmargin -= hmargin % CVT_H_GRANULARITY;
192 }
193 /* find the total active pixels */
194 drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
195
196 /* find the number of lines per field */
197 if (interlaced)
198 vdisplay_rnd = vdisplay / 2;
199 else
200 vdisplay_rnd = vdisplay;
201
202 /* find the top & bottom borders */
203 vmargin = 0;
204 if (margins)
205 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
206
207 drm_mode->vdisplay = vdisplay + 2 * vmargin;
208
209 /* Interlaced */
210 if (interlaced)
211 interlace = 1;
212 else
213 interlace = 0;
214
215 /* Determine VSync Width from aspect ratio */
216 if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
217 vsync = 4;
218 else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
219 vsync = 5;
220 else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
221 vsync = 6;
222 else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
223 vsync = 7;
224 else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
225 vsync = 7;
226 else /* custom */
227 vsync = 10;
228
229 if (!reduced) {
230 /* simplify the GTF calculation */
231 /* 4) Minimum time of vertical sync + back porch interval (µs)
232 * default 550.0
233 */
234 int tmp1, tmp2;
235#define CVT_MIN_VSYNC_BP 550
236 /* 3) Nominal HSync width (% of line period) - default 8 */
237#define CVT_HSYNC_PERCENTAGE 8
238 unsigned int hblank_percentage;
239 int vsyncandback_porch, __maybe_unused vback_porch, hblank;
240
241 /* estimated the horizontal period */
242 tmp1 = HV_FACTOR * 1000000 -
243 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
244 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
245 interlace;
246 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
247
248 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
249 /* 9. Find number of lines in sync + backporch */
250 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
251 vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
252 else
253 vsyncandback_porch = tmp1;
254 /* 10. Find number of lines in back porch */
255 vback_porch = vsyncandback_porch - vsync;
256 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
257 vsyncandback_porch + CVT_MIN_V_PORCH;
258 /* 5) Definition of Horizontal blanking time limitation */
259 /* Gradient (%/kHz) - default 600 */
260#define CVT_M_FACTOR 600
261 /* Offset (%) - default 40 */
262#define CVT_C_FACTOR 40
263 /* Blanking time scaling factor - default 128 */
264#define CVT_K_FACTOR 128
265 /* Scaling factor weighting - default 20 */
266#define CVT_J_FACTOR 20
267#define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256)
268#define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
269 CVT_J_FACTOR)
270 /* 12. Find ideal blanking duty cycle from formula */
271 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
272 hperiod / 1000;
273 /* 13. Blanking time */
274 if (hblank_percentage < 20 * HV_FACTOR)
275 hblank_percentage = 20 * HV_FACTOR;
276 hblank = drm_mode->hdisplay * hblank_percentage /
277 (100 * HV_FACTOR - hblank_percentage);
278 hblank -= hblank % (2 * CVT_H_GRANULARITY);
279 /* 14. find the total pixels per line */
280 drm_mode->htotal = drm_mode->hdisplay + hblank;
281 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
282 drm_mode->hsync_start = drm_mode->hsync_end -
283 (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
284 drm_mode->hsync_start += CVT_H_GRANULARITY -
285 drm_mode->hsync_start % CVT_H_GRANULARITY;
286 /* fill the Vsync values */
287 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
288 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
289 } else {
290 /* Reduced blanking */
291 /* Minimum vertical blanking interval time (µs)- default 460 */
292#define CVT_RB_MIN_VBLANK 460
293 /* Fixed number of clocks for horizontal sync */
294#define CVT_RB_H_SYNC 32
295 /* Fixed number of clocks for horizontal blanking */
296#define CVT_RB_H_BLANK 160
297 /* Fixed number of lines for vertical front porch - default 3*/
298#define CVT_RB_VFPORCH 3
299 int vbilines;
300 int tmp1, tmp2;
301 /* 8. Estimate Horizontal period. */
302 tmp1 = HV_FACTOR * 1000000 -
303 CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
304 tmp2 = vdisplay_rnd + 2 * vmargin;
305 hperiod = tmp1 / (tmp2 * vfieldrate);
306 /* 9. Find number of lines in vertical blanking */
307 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
308 /* 10. Check if vertical blanking is sufficient */
309 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
310 vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
311 /* 11. Find total number of lines in vertical field */
312 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
313 /* 12. Find total number of pixels in a line */
314 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
315 /* Fill in HSync values */
316 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
317 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
318 /* Fill in VSync values */
319 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
320 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
321 }
322 /* 15/13. Find pixel clock frequency (kHz for xf86) */
323 tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
324 tmp *= HV_FACTOR * 1000;
325 do_div(tmp, hperiod);
326 tmp -= drm_mode->clock % CVT_CLOCK_STEP;
327 drm_mode->clock = tmp;
328 /* 18/16. Find actual vertical frame frequency */
329 /* ignore - just set the mode flag for interlaced */
330 if (interlaced) {
331 drm_mode->vtotal *= 2;
332 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
333 }
334 /* Fill the mode line name */
335 drm_mode_set_name(drm_mode);
336 if (reduced)
337 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
338 DRM_MODE_FLAG_NVSYNC);
339 else
340 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
341 DRM_MODE_FLAG_NHSYNC);
342
343 return drm_mode;
344}
345EXPORT_SYMBOL(drm_cvt_mode);
346
347/**
348 * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
349 * @dev: drm device
350 * @hdisplay: hdisplay size
351 * @vdisplay: vdisplay size
352 * @vrefresh: vrefresh rate.
353 * @interlaced: whether to compute an interlaced mode
354 * @margins: desired margin (borders) size
355 * @GTF_M: extended GTF formula parameters
356 * @GTF_2C: extended GTF formula parameters
357 * @GTF_K: extended GTF formula parameters
358 * @GTF_2J: extended GTF formula parameters
359 *
360 * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
361 * in here multiplied by two. For a C of 40, pass in 80.
362 *
363 * Returns:
364 * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
365 * The display mode object is allocated with drm_mode_create(). Returns NULL
366 * when no mode could be allocated.
367 */
368struct drm_display_mode *
369drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
370 int vrefresh, bool interlaced, int margins,
371 int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
372{ /* 1) top/bottom margin size (% of height) - default: 1.8, */
373#define GTF_MARGIN_PERCENTAGE 18
374 /* 2) character cell horizontal granularity (pixels) - default 8 */
375#define GTF_CELL_GRAN 8
376 /* 3) Minimum vertical porch (lines) - default 3 */
377#define GTF_MIN_V_PORCH 1
378 /* width of vsync in lines */
379#define V_SYNC_RQD 3
380 /* width of hsync as % of total line */
381#define H_SYNC_PERCENT 8
382 /* min time of vsync + back porch (microsec) */
383#define MIN_VSYNC_PLUS_BP 550
384 /* C' and M' are part of the Blanking Duty Cycle computation */
385#define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
386#define GTF_M_PRIME (GTF_K * GTF_M / 256)
387 struct drm_display_mode *drm_mode;
388 unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
389 int top_margin, bottom_margin;
390 int interlace;
391 unsigned int hfreq_est;
392 int vsync_plus_bp, __maybe_unused vback_porch;
393 unsigned int vtotal_lines, __maybe_unused vfieldrate_est;
394 unsigned int __maybe_unused hperiod;
395 unsigned int vfield_rate, __maybe_unused vframe_rate;
396 int left_margin, right_margin;
397 unsigned int total_active_pixels, ideal_duty_cycle;
398 unsigned int hblank, total_pixels, pixel_freq;
399 int hsync, hfront_porch, vodd_front_porch_lines;
400 unsigned int tmp1, tmp2;
401
402 if (!hdisplay || !vdisplay)
403 return NULL;
404
405 drm_mode = drm_mode_create(dev);
406 if (!drm_mode)
407 return NULL;
408
409 /* 1. In order to give correct results, the number of horizontal
410 * pixels requested is first processed to ensure that it is divisible
411 * by the character size, by rounding it to the nearest character
412 * cell boundary:
413 */
414 hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
415 hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
416
417 /* 2. If interlace is requested, the number of vertical lines assumed
418 * by the calculation must be halved, as the computation calculates
419 * the number of vertical lines per field.
420 */
421 if (interlaced)
422 vdisplay_rnd = vdisplay / 2;
423 else
424 vdisplay_rnd = vdisplay;
425
426 /* 3. Find the frame rate required: */
427 if (interlaced)
428 vfieldrate_rqd = vrefresh * 2;
429 else
430 vfieldrate_rqd = vrefresh;
431
432 /* 4. Find number of lines in Top margin: */
433 top_margin = 0;
434 if (margins)
435 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
436 1000;
437 /* 5. Find number of lines in bottom margin: */
438 bottom_margin = top_margin;
439
440 /* 6. If interlace is required, then set variable interlace: */
441 if (interlaced)
442 interlace = 1;
443 else
444 interlace = 0;
445
446 /* 7. Estimate the Horizontal frequency */
447 {
448 tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
449 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
450 2 + interlace;
451 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
452 }
453
454 /* 8. Find the number of lines in V sync + back porch */
455 /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
456 vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
457 vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
458 /* 9. Find the number of lines in V back porch alone: */
459 vback_porch = vsync_plus_bp - V_SYNC_RQD;
460 /* 10. Find the total number of lines in Vertical field period: */
461 vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
462 vsync_plus_bp + GTF_MIN_V_PORCH;
463 /* 11. Estimate the Vertical field frequency: */
464 vfieldrate_est = hfreq_est / vtotal_lines;
465 /* 12. Find the actual horizontal period: */
466 hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
467
468 /* 13. Find the actual Vertical field frequency: */
469 vfield_rate = hfreq_est / vtotal_lines;
470 /* 14. Find the Vertical frame frequency: */
471 if (interlaced)
472 vframe_rate = vfield_rate / 2;
473 else
474 vframe_rate = vfield_rate;
475 /* 15. Find number of pixels in left margin: */
476 if (margins)
477 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
478 1000;
479 else
480 left_margin = 0;
481
482 /* 16.Find number of pixels in right margin: */
483 right_margin = left_margin;
484 /* 17.Find total number of active pixels in image and left and right */
485 total_active_pixels = hdisplay_rnd + left_margin + right_margin;
486 /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
487 ideal_duty_cycle = GTF_C_PRIME * 1000 -
488 (GTF_M_PRIME * 1000000 / hfreq_est);
489 /* 19.Find the number of pixels in the blanking time to the nearest
490 * double character cell: */
491 hblank = total_active_pixels * ideal_duty_cycle /
492 (100000 - ideal_duty_cycle);
493 hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
494 hblank = hblank * 2 * GTF_CELL_GRAN;
495 /* 20.Find total number of pixels: */
496 total_pixels = total_active_pixels + hblank;
497 /* 21.Find pixel clock frequency: */
498 pixel_freq = total_pixels * hfreq_est / 1000;
499 /* Stage 1 computations are now complete; I should really pass
500 * the results to another function and do the Stage 2 computations,
501 * but I only need a few more values so I'll just append the
502 * computations here for now */
503 /* 17. Find the number of pixels in the horizontal sync period: */
504 hsync = H_SYNC_PERCENT * total_pixels / 100;
505 hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
506 hsync = hsync * GTF_CELL_GRAN;
507 /* 18. Find the number of pixels in horizontal front porch period */
508 hfront_porch = hblank / 2 - hsync;
509 /* 36. Find the number of lines in the odd front porch period: */
510 vodd_front_porch_lines = GTF_MIN_V_PORCH ;
511
512 /* finally, pack the results in the mode struct */
513 drm_mode->hdisplay = hdisplay_rnd;
514 drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
515 drm_mode->hsync_end = drm_mode->hsync_start + hsync;
516 drm_mode->htotal = total_pixels;
517 drm_mode->vdisplay = vdisplay_rnd;
518 drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
519 drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
520 drm_mode->vtotal = vtotal_lines;
521
522 drm_mode->clock = pixel_freq;
523
524 if (interlaced) {
525 drm_mode->vtotal *= 2;
526 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
527 }
528
529 drm_mode_set_name(drm_mode);
530 if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
531 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
532 else
533 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
534
535 return drm_mode;
536}
537EXPORT_SYMBOL(drm_gtf_mode_complex);
538
539/**
540 * drm_gtf_mode - create the modeline based on the GTF algorithm
541 * @dev: drm device
542 * @hdisplay: hdisplay size
543 * @vdisplay: vdisplay size
544 * @vrefresh: vrefresh rate.
545 * @interlaced: whether to compute an interlaced mode
546 * @margins: desired margin (borders) size
547 *
548 * return the modeline based on GTF algorithm
549 *
550 * This function is to create the modeline based on the GTF algorithm.
551 * Generalized Timing Formula is derived from:
552 *
553 * GTF Spreadsheet by Andy Morrish (1/5/97)
554 * available at https://www.vesa.org
555 *
556 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
557 * What I have done is to translate it by using integer calculation.
558 * I also refer to the function of fb_get_mode in the file of
559 * drivers/video/fbmon.c
560 *
561 * Standard GTF parameters::
562 *
563 * M = 600
564 * C = 40
565 * K = 128
566 * J = 20
567 *
568 * Returns:
569 * The modeline based on the GTF algorithm stored in a drm_display_mode object.
570 * The display mode object is allocated with drm_mode_create(). Returns NULL
571 * when no mode could be allocated.
572 */
573struct drm_display_mode *
574drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
575 bool interlaced, int margins)
576{
577 return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
578 interlaced, margins,
579 600, 40 * 2, 128, 20 * 2);
580}
581EXPORT_SYMBOL(drm_gtf_mode);
582
583#ifdef CONFIG_VIDEOMODE_HELPERS
584/**
585 * drm_display_mode_from_videomode - fill in @dmode using @vm,
586 * @vm: videomode structure to use as source
587 * @dmode: drm_display_mode structure to use as destination
588 *
589 * Fills out @dmode using the display mode specified in @vm.
590 */
591void drm_display_mode_from_videomode(const struct videomode *vm,
592 struct drm_display_mode *dmode)
593{
594 dmode->hdisplay = vm->hactive;
595 dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
596 dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
597 dmode->htotal = dmode->hsync_end + vm->hback_porch;
598
599 dmode->vdisplay = vm->vactive;
600 dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
601 dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
602 dmode->vtotal = dmode->vsync_end + vm->vback_porch;
603
604 dmode->clock = vm->pixelclock / 1000;
605
606 dmode->flags = 0;
607 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
608 dmode->flags |= DRM_MODE_FLAG_PHSYNC;
609 else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
610 dmode->flags |= DRM_MODE_FLAG_NHSYNC;
611 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
612 dmode->flags |= DRM_MODE_FLAG_PVSYNC;
613 else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
614 dmode->flags |= DRM_MODE_FLAG_NVSYNC;
615 if (vm->flags & DISPLAY_FLAGS_INTERLACED)
616 dmode->flags |= DRM_MODE_FLAG_INTERLACE;
617 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
618 dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
619 if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
620 dmode->flags |= DRM_MODE_FLAG_DBLCLK;
621 drm_mode_set_name(dmode);
622}
623EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
624
625/**
626 * drm_display_mode_to_videomode - fill in @vm using @dmode,
627 * @dmode: drm_display_mode structure to use as source
628 * @vm: videomode structure to use as destination
629 *
630 * Fills out @vm using the display mode specified in @dmode.
631 */
632void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
633 struct videomode *vm)
634{
635 vm->hactive = dmode->hdisplay;
636 vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
637 vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
638 vm->hback_porch = dmode->htotal - dmode->hsync_end;
639
640 vm->vactive = dmode->vdisplay;
641 vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
642 vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
643 vm->vback_porch = dmode->vtotal - dmode->vsync_end;
644
645 vm->pixelclock = dmode->clock * 1000;
646
647 vm->flags = 0;
648 if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
649 vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
650 else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
651 vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
652 if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
653 vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
654 else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
655 vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
656 if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
657 vm->flags |= DISPLAY_FLAGS_INTERLACED;
658 if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
659 vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
660 if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
661 vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
662}
663EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
664
665/**
666 * drm_bus_flags_from_videomode - extract information about pixelclk and
667 * DE polarity from videomode and store it in a separate variable
668 * @vm: videomode structure to use
669 * @bus_flags: information about pixelclk, sync and DE polarity will be stored
670 * here
671 *
672 * Sets DRM_BUS_FLAG_DE_(LOW|HIGH), DRM_BUS_FLAG_PIXDATA_DRIVE_(POS|NEG)EDGE
673 * and DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
674 * found in @vm
675 */
676void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
677{
678 *bus_flags = 0;
679 if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
680 *bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
681 if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
682 *bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
683
684 if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
685 *bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE;
686 if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
687 *bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE;
688
689 if (vm->flags & DISPLAY_FLAGS_DE_LOW)
690 *bus_flags |= DRM_BUS_FLAG_DE_LOW;
691 if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
692 *bus_flags |= DRM_BUS_FLAG_DE_HIGH;
693}
694EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
695
696#ifdef CONFIG_OF
697/**
698 * of_get_drm_display_mode - get a drm_display_mode from devicetree
699 * @np: device_node with the timing specification
700 * @dmode: will be set to the return value
701 * @bus_flags: information about pixelclk, sync and DE polarity
702 * @index: index into the list of display timings in devicetree
703 *
704 * This function is expensive and should only be used, if only one mode is to be
705 * read from DT. To get multiple modes start with of_get_display_timings and
706 * work with that instead.
707 *
708 * Returns:
709 * 0 on success, a negative errno code when no of videomode node was found.
710 */
711int of_get_drm_display_mode(struct device_node *np,
712 struct drm_display_mode *dmode, u32 *bus_flags,
713 int index)
714{
715 struct videomode vm;
716 int ret;
717
718 ret = of_get_videomode(np, &vm, index);
719 if (ret)
720 return ret;
721
722 drm_display_mode_from_videomode(&vm, dmode);
723 if (bus_flags)
724 drm_bus_flags_from_videomode(&vm, bus_flags);
725
726 pr_debug("%pOF: got %dx%d display mode\n",
727 np, vm.hactive, vm.vactive);
728 drm_mode_debug_printmodeline(dmode);
729
730 return 0;
731}
732EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
733
734/**
735 * of_get_drm_panel_display_mode - get a panel-timing drm_display_mode from devicetree
736 * @np: device_node with the panel-timing specification
737 * @dmode: will be set to the return value
738 * @bus_flags: information about pixelclk, sync and DE polarity
739 *
740 * The mandatory Device Tree properties width-mm and height-mm
741 * are read and set on the display mode.
742 *
743 * Returns:
744 * Zero on success, negative error code on failure.
745 */
746int of_get_drm_panel_display_mode(struct device_node *np,
747 struct drm_display_mode *dmode, u32 *bus_flags)
748{
749 u32 width_mm = 0, height_mm = 0;
750 struct display_timing timing;
751 struct videomode vm;
752 int ret;
753
754 ret = of_get_display_timing(np, "panel-timing", &timing);
755 if (ret)
756 return ret;
757
758 videomode_from_timing(&timing, &vm);
759
760 memset(dmode, 0, sizeof(*dmode));
761 drm_display_mode_from_videomode(&vm, dmode);
762 if (bus_flags)
763 drm_bus_flags_from_videomode(&vm, bus_flags);
764
765 ret = of_property_read_u32(np, "width-mm", &width_mm);
766 if (ret)
767 return ret;
768
769 ret = of_property_read_u32(np, "height-mm", &height_mm);
770 if (ret)
771 return ret;
772
773 dmode->width_mm = width_mm;
774 dmode->height_mm = height_mm;
775
776 drm_mode_debug_printmodeline(dmode);
777
778 return 0;
779}
780EXPORT_SYMBOL_GPL(of_get_drm_panel_display_mode);
781#endif /* CONFIG_OF */
782#endif /* CONFIG_VIDEOMODE_HELPERS */
783
784/**
785 * drm_mode_set_name - set the name on a mode
786 * @mode: name will be set in this mode
787 *
788 * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
789 * with an optional 'i' suffix for interlaced modes.
790 */
791void drm_mode_set_name(struct drm_display_mode *mode)
792{
793 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
794
795 snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
796 mode->hdisplay, mode->vdisplay,
797 interlaced ? "i" : "");
798}
799EXPORT_SYMBOL(drm_mode_set_name);
800
801/**
802 * drm_mode_vrefresh - get the vrefresh of a mode
803 * @mode: mode
804 *
805 * Returns:
806 * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
807 * value first if it is not yet set.
808 */
809int drm_mode_vrefresh(const struct drm_display_mode *mode)
810{
811 unsigned int num, den;
812
813 if (mode->htotal == 0 || mode->vtotal == 0)
814 return 0;
815
816 num = mode->clock;
817 den = mode->htotal * mode->vtotal;
818
819 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
820 num *= 2;
821 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
822 den *= 2;
823 if (mode->vscan > 1)
824 den *= mode->vscan;
825
826 return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den);
827}
828EXPORT_SYMBOL(drm_mode_vrefresh);
829
830/**
831 * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
832 * @mode: mode to query
833 * @hdisplay: hdisplay value to fill in
834 * @vdisplay: vdisplay value to fill in
835 *
836 * The vdisplay value will be doubled if the specified mode is a stereo mode of
837 * the appropriate layout.
838 */
839void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
840 int *hdisplay, int *vdisplay)
841{
842 struct drm_display_mode adjusted;
843
844 drm_mode_init(&adjusted, mode);
845
846 drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
847 *hdisplay = adjusted.crtc_hdisplay;
848 *vdisplay = adjusted.crtc_vdisplay;
849}
850EXPORT_SYMBOL(drm_mode_get_hv_timing);
851
852/**
853 * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
854 * @p: mode
855 * @adjust_flags: a combination of adjustment flags
856 *
857 * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
858 *
859 * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
860 * interlaced modes.
861 * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
862 * buffers containing two eyes (only adjust the timings when needed, eg. for
863 * "frame packing" or "side by side full").
864 * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
865 * be performed for doublescan and vscan > 1 modes respectively.
866 */
867void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
868{
869 if (!p)
870 return;
871
872 p->crtc_clock = p->clock;
873 p->crtc_hdisplay = p->hdisplay;
874 p->crtc_hsync_start = p->hsync_start;
875 p->crtc_hsync_end = p->hsync_end;
876 p->crtc_htotal = p->htotal;
877 p->crtc_hskew = p->hskew;
878 p->crtc_vdisplay = p->vdisplay;
879 p->crtc_vsync_start = p->vsync_start;
880 p->crtc_vsync_end = p->vsync_end;
881 p->crtc_vtotal = p->vtotal;
882
883 if (p->flags & DRM_MODE_FLAG_INTERLACE) {
884 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
885 p->crtc_vdisplay /= 2;
886 p->crtc_vsync_start /= 2;
887 p->crtc_vsync_end /= 2;
888 p->crtc_vtotal /= 2;
889 }
890 }
891
892 if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
893 if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
894 p->crtc_vdisplay *= 2;
895 p->crtc_vsync_start *= 2;
896 p->crtc_vsync_end *= 2;
897 p->crtc_vtotal *= 2;
898 }
899 }
900
901 if (!(adjust_flags & CRTC_NO_VSCAN)) {
902 if (p->vscan > 1) {
903 p->crtc_vdisplay *= p->vscan;
904 p->crtc_vsync_start *= p->vscan;
905 p->crtc_vsync_end *= p->vscan;
906 p->crtc_vtotal *= p->vscan;
907 }
908 }
909
910 if (adjust_flags & CRTC_STEREO_DOUBLE) {
911 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
912
913 switch (layout) {
914 case DRM_MODE_FLAG_3D_FRAME_PACKING:
915 p->crtc_clock *= 2;
916 p->crtc_vdisplay += p->crtc_vtotal;
917 p->crtc_vsync_start += p->crtc_vtotal;
918 p->crtc_vsync_end += p->crtc_vtotal;
919 p->crtc_vtotal += p->crtc_vtotal;
920 break;
921 }
922 }
923
924 p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
925 p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
926 p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
927 p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
928}
929EXPORT_SYMBOL(drm_mode_set_crtcinfo);
930
931/**
932 * drm_mode_copy - copy the mode
933 * @dst: mode to overwrite
934 * @src: mode to copy
935 *
936 * Copy an existing mode into another mode, preserving the
937 * list head of the destination mode.
938 */
939void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
940{
941 struct list_head head = dst->head;
942
943 *dst = *src;
944 dst->head = head;
945}
946EXPORT_SYMBOL(drm_mode_copy);
947
948/**
949 * drm_mode_init - initialize the mode from another mode
950 * @dst: mode to overwrite
951 * @src: mode to copy
952 *
953 * Copy an existing mode into another mode, zeroing the
954 * list head of the destination mode. Typically used
955 * to guarantee the list head is not left with stack
956 * garbage in on-stack modes.
957 */
958void drm_mode_init(struct drm_display_mode *dst, const struct drm_display_mode *src)
959{
960 memset(dst, 0, sizeof(*dst));
961 drm_mode_copy(dst, src);
962}
963EXPORT_SYMBOL(drm_mode_init);
964
965/**
966 * drm_mode_duplicate - allocate and duplicate an existing mode
967 * @dev: drm_device to allocate the duplicated mode for
968 * @mode: mode to duplicate
969 *
970 * Just allocate a new mode, copy the existing mode into it, and return
971 * a pointer to it. Used to create new instances of established modes.
972 *
973 * Returns:
974 * Pointer to duplicated mode on success, NULL on error.
975 */
976struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
977 const struct drm_display_mode *mode)
978{
979 struct drm_display_mode *nmode;
980
981 nmode = drm_mode_create(dev);
982 if (!nmode)
983 return NULL;
984
985 drm_mode_copy(nmode, mode);
986
987 return nmode;
988}
989EXPORT_SYMBOL(drm_mode_duplicate);
990
991static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
992 const struct drm_display_mode *mode2)
993{
994 return mode1->hdisplay == mode2->hdisplay &&
995 mode1->hsync_start == mode2->hsync_start &&
996 mode1->hsync_end == mode2->hsync_end &&
997 mode1->htotal == mode2->htotal &&
998 mode1->hskew == mode2->hskew &&
999 mode1->vdisplay == mode2->vdisplay &&
1000 mode1->vsync_start == mode2->vsync_start &&
1001 mode1->vsync_end == mode2->vsync_end &&
1002 mode1->vtotal == mode2->vtotal &&
1003 mode1->vscan == mode2->vscan;
1004}
1005
1006static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
1007 const struct drm_display_mode *mode2)
1008{
1009 /*
1010 * do clock check convert to PICOS
1011 * so fb modes get matched the same
1012 */
1013 if (mode1->clock && mode2->clock)
1014 return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
1015 else
1016 return mode1->clock == mode2->clock;
1017}
1018
1019static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
1020 const struct drm_display_mode *mode2)
1021{
1022 return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
1023 (mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
1024}
1025
1026static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
1027 const struct drm_display_mode *mode2)
1028{
1029 return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
1030 (mode2->flags & DRM_MODE_FLAG_3D_MASK);
1031}
1032
1033static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
1034 const struct drm_display_mode *mode2)
1035{
1036 return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
1037}
1038
1039/**
1040 * drm_mode_match - test modes for (partial) equality
1041 * @mode1: first mode
1042 * @mode2: second mode
1043 * @match_flags: which parts need to match (DRM_MODE_MATCH_*)
1044 *
1045 * Check to see if @mode1 and @mode2 are equivalent.
1046 *
1047 * Returns:
1048 * True if the modes are (partially) equal, false otherwise.
1049 */
1050bool drm_mode_match(const struct drm_display_mode *mode1,
1051 const struct drm_display_mode *mode2,
1052 unsigned int match_flags)
1053{
1054 if (!mode1 && !mode2)
1055 return true;
1056
1057 if (!mode1 || !mode2)
1058 return false;
1059
1060 if (match_flags & DRM_MODE_MATCH_TIMINGS &&
1061 !drm_mode_match_timings(mode1, mode2))
1062 return false;
1063
1064 if (match_flags & DRM_MODE_MATCH_CLOCK &&
1065 !drm_mode_match_clock(mode1, mode2))
1066 return false;
1067
1068 if (match_flags & DRM_MODE_MATCH_FLAGS &&
1069 !drm_mode_match_flags(mode1, mode2))
1070 return false;
1071
1072 if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
1073 !drm_mode_match_3d_flags(mode1, mode2))
1074 return false;
1075
1076 if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
1077 !drm_mode_match_aspect_ratio(mode1, mode2))
1078 return false;
1079
1080 return true;
1081}
1082EXPORT_SYMBOL(drm_mode_match);
1083
1084/**
1085 * drm_mode_equal - test modes for equality
1086 * @mode1: first mode
1087 * @mode2: second mode
1088 *
1089 * Check to see if @mode1 and @mode2 are equivalent.
1090 *
1091 * Returns:
1092 * True if the modes are equal, false otherwise.
1093 */
1094bool drm_mode_equal(const struct drm_display_mode *mode1,
1095 const struct drm_display_mode *mode2)
1096{
1097 return drm_mode_match(mode1, mode2,
1098 DRM_MODE_MATCH_TIMINGS |
1099 DRM_MODE_MATCH_CLOCK |
1100 DRM_MODE_MATCH_FLAGS |
1101 DRM_MODE_MATCH_3D_FLAGS|
1102 DRM_MODE_MATCH_ASPECT_RATIO);
1103}
1104EXPORT_SYMBOL(drm_mode_equal);
1105
1106/**
1107 * drm_mode_equal_no_clocks - test modes for equality
1108 * @mode1: first mode
1109 * @mode2: second mode
1110 *
1111 * Check to see if @mode1 and @mode2 are equivalent, but
1112 * don't check the pixel clocks.
1113 *
1114 * Returns:
1115 * True if the modes are equal, false otherwise.
1116 */
1117bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
1118 const struct drm_display_mode *mode2)
1119{
1120 return drm_mode_match(mode1, mode2,
1121 DRM_MODE_MATCH_TIMINGS |
1122 DRM_MODE_MATCH_FLAGS |
1123 DRM_MODE_MATCH_3D_FLAGS);
1124}
1125EXPORT_SYMBOL(drm_mode_equal_no_clocks);
1126
1127/**
1128 * drm_mode_equal_no_clocks_no_stereo - test modes for equality
1129 * @mode1: first mode
1130 * @mode2: second mode
1131 *
1132 * Check to see if @mode1 and @mode2 are equivalent, but
1133 * don't check the pixel clocks nor the stereo layout.
1134 *
1135 * Returns:
1136 * True if the modes are equal, false otherwise.
1137 */
1138bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
1139 const struct drm_display_mode *mode2)
1140{
1141 return drm_mode_match(mode1, mode2,
1142 DRM_MODE_MATCH_TIMINGS |
1143 DRM_MODE_MATCH_FLAGS);
1144}
1145EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
1146
1147static enum drm_mode_status
1148drm_mode_validate_basic(const struct drm_display_mode *mode)
1149{
1150 if (mode->type & ~DRM_MODE_TYPE_ALL)
1151 return MODE_BAD;
1152
1153 if (mode->flags & ~DRM_MODE_FLAG_ALL)
1154 return MODE_BAD;
1155
1156 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1157 return MODE_BAD;
1158
1159 if (mode->clock == 0)
1160 return MODE_CLOCK_LOW;
1161
1162 if (mode->hdisplay == 0 ||
1163 mode->hsync_start < mode->hdisplay ||
1164 mode->hsync_end < mode->hsync_start ||
1165 mode->htotal < mode->hsync_end)
1166 return MODE_H_ILLEGAL;
1167
1168 if (mode->vdisplay == 0 ||
1169 mode->vsync_start < mode->vdisplay ||
1170 mode->vsync_end < mode->vsync_start ||
1171 mode->vtotal < mode->vsync_end)
1172 return MODE_V_ILLEGAL;
1173
1174 return MODE_OK;
1175}
1176
1177/**
1178 * drm_mode_validate_driver - make sure the mode is somewhat sane
1179 * @dev: drm device
1180 * @mode: mode to check
1181 *
1182 * First do basic validation on the mode, and then allow the driver
1183 * to check for device/driver specific limitations via the optional
1184 * &drm_mode_config_helper_funcs.mode_valid hook.
1185 *
1186 * Returns:
1187 * The mode status
1188 */
1189enum drm_mode_status
1190drm_mode_validate_driver(struct drm_device *dev,
1191 const struct drm_display_mode *mode)
1192{
1193 enum drm_mode_status status;
1194
1195 status = drm_mode_validate_basic(mode);
1196 if (status != MODE_OK)
1197 return status;
1198
1199 if (dev->mode_config.funcs->mode_valid)
1200 return dev->mode_config.funcs->mode_valid(dev, mode);
1201 else
1202 return MODE_OK;
1203}
1204EXPORT_SYMBOL(drm_mode_validate_driver);
1205
1206/**
1207 * drm_mode_validate_size - make sure modes adhere to size constraints
1208 * @mode: mode to check
1209 * @maxX: maximum width
1210 * @maxY: maximum height
1211 *
1212 * This function is a helper which can be used to validate modes against size
1213 * limitations of the DRM device/connector. If a mode is too big its status
1214 * member is updated with the appropriate validation failure code. The list
1215 * itself is not changed.
1216 *
1217 * Returns:
1218 * The mode status
1219 */
1220enum drm_mode_status
1221drm_mode_validate_size(const struct drm_display_mode *mode,
1222 int maxX, int maxY)
1223{
1224 if (maxX > 0 && mode->hdisplay > maxX)
1225 return MODE_VIRTUAL_X;
1226
1227 if (maxY > 0 && mode->vdisplay > maxY)
1228 return MODE_VIRTUAL_Y;
1229
1230 return MODE_OK;
1231}
1232EXPORT_SYMBOL(drm_mode_validate_size);
1233
1234/**
1235 * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
1236 * @mode: mode to check
1237 * @connector: drm connector under action
1238 *
1239 * This function is a helper which can be used to filter out any YCBCR420
1240 * only mode, when the source doesn't support it.
1241 *
1242 * Returns:
1243 * The mode status
1244 */
1245enum drm_mode_status
1246drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
1247 struct drm_connector *connector)
1248{
1249 if (!connector->ycbcr_420_allowed &&
1250 drm_mode_is_420_only(&connector->display_info, mode))
1251 return MODE_NO_420;
1252
1253 return MODE_OK;
1254}
1255EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
1256
1257#define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1258
1259static const char * const drm_mode_status_names[] = {
1260 MODE_STATUS(OK),
1261 MODE_STATUS(HSYNC),
1262 MODE_STATUS(VSYNC),
1263 MODE_STATUS(H_ILLEGAL),
1264 MODE_STATUS(V_ILLEGAL),
1265 MODE_STATUS(BAD_WIDTH),
1266 MODE_STATUS(NOMODE),
1267 MODE_STATUS(NO_INTERLACE),
1268 MODE_STATUS(NO_DBLESCAN),
1269 MODE_STATUS(NO_VSCAN),
1270 MODE_STATUS(MEM),
1271 MODE_STATUS(VIRTUAL_X),
1272 MODE_STATUS(VIRTUAL_Y),
1273 MODE_STATUS(MEM_VIRT),
1274 MODE_STATUS(NOCLOCK),
1275 MODE_STATUS(CLOCK_HIGH),
1276 MODE_STATUS(CLOCK_LOW),
1277 MODE_STATUS(CLOCK_RANGE),
1278 MODE_STATUS(BAD_HVALUE),
1279 MODE_STATUS(BAD_VVALUE),
1280 MODE_STATUS(BAD_VSCAN),
1281 MODE_STATUS(HSYNC_NARROW),
1282 MODE_STATUS(HSYNC_WIDE),
1283 MODE_STATUS(HBLANK_NARROW),
1284 MODE_STATUS(HBLANK_WIDE),
1285 MODE_STATUS(VSYNC_NARROW),
1286 MODE_STATUS(VSYNC_WIDE),
1287 MODE_STATUS(VBLANK_NARROW),
1288 MODE_STATUS(VBLANK_WIDE),
1289 MODE_STATUS(PANEL),
1290 MODE_STATUS(INTERLACE_WIDTH),
1291 MODE_STATUS(ONE_WIDTH),
1292 MODE_STATUS(ONE_HEIGHT),
1293 MODE_STATUS(ONE_SIZE),
1294 MODE_STATUS(NO_REDUCED),
1295 MODE_STATUS(NO_STEREO),
1296 MODE_STATUS(NO_420),
1297 MODE_STATUS(STALE),
1298 MODE_STATUS(BAD),
1299 MODE_STATUS(ERROR),
1300};
1301
1302#undef MODE_STATUS
1303
1304const char *drm_get_mode_status_name(enum drm_mode_status status)
1305{
1306 int index = status + 3;
1307
1308 if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1309 return "";
1310
1311 return drm_mode_status_names[index];
1312}
1313
1314/**
1315 * drm_mode_prune_invalid - remove invalid modes from mode list
1316 * @dev: DRM device
1317 * @mode_list: list of modes to check
1318 * @verbose: be verbose about it
1319 *
1320 * This helper function can be used to prune a display mode list after
1321 * validation has been completed. All modes whose status is not MODE_OK will be
1322 * removed from the list, and if @verbose the status code and mode name is also
1323 * printed to dmesg.
1324 */
1325void drm_mode_prune_invalid(struct drm_device *dev,
1326 struct list_head *mode_list, bool verbose)
1327{
1328 struct drm_display_mode *mode, *t;
1329
1330 list_for_each_entry_safe(mode, t, mode_list, head) {
1331 if (mode->status != MODE_OK) {
1332 list_del(&mode->head);
1333 if (mode->type & DRM_MODE_TYPE_USERDEF) {
1334 drm_warn(dev, "User-defined mode not supported: "
1335 DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
1336 }
1337 if (verbose) {
1338 drm_mode_debug_printmodeline(mode);
1339 DRM_DEBUG_KMS("Not using %s mode: %s\n",
1340 mode->name,
1341 drm_get_mode_status_name(mode->status));
1342 }
1343 drm_mode_destroy(dev, mode);
1344 }
1345 }
1346}
1347EXPORT_SYMBOL(drm_mode_prune_invalid);
1348
1349/**
1350 * drm_mode_compare - compare modes for favorability
1351 * @priv: unused
1352 * @lh_a: list_head for first mode
1353 * @lh_b: list_head for second mode
1354 *
1355 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1356 * which is better.
1357 *
1358 * Returns:
1359 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1360 * positive if @lh_b is better than @lh_a.
1361 */
1362static int drm_mode_compare(void *priv, const struct list_head *lh_a,
1363 const struct list_head *lh_b)
1364{
1365 struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1366 struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1367 int diff;
1368
1369 diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1370 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1371 if (diff)
1372 return diff;
1373 diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1374 if (diff)
1375 return diff;
1376
1377 diff = drm_mode_vrefresh(b) - drm_mode_vrefresh(a);
1378 if (diff)
1379 return diff;
1380
1381 diff = b->clock - a->clock;
1382 return diff;
1383}
1384
1385/**
1386 * drm_mode_sort - sort mode list
1387 * @mode_list: list of drm_display_mode structures to sort
1388 *
1389 * Sort @mode_list by favorability, moving good modes to the head of the list.
1390 */
1391void drm_mode_sort(struct list_head *mode_list)
1392{
1393 list_sort(NULL, mode_list, drm_mode_compare);
1394}
1395EXPORT_SYMBOL(drm_mode_sort);
1396
1397/**
1398 * drm_connector_list_update - update the mode list for the connector
1399 * @connector: the connector to update
1400 *
1401 * This moves the modes from the @connector probed_modes list
1402 * to the actual mode list. It compares the probed mode against the current
1403 * list and only adds different/new modes.
1404 *
1405 * This is just a helper functions doesn't validate any modes itself and also
1406 * doesn't prune any invalid modes. Callers need to do that themselves.
1407 */
1408void drm_connector_list_update(struct drm_connector *connector)
1409{
1410 struct drm_display_mode *pmode, *pt;
1411
1412 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1413
1414 list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1415 struct drm_display_mode *mode;
1416 bool found_it = false;
1417
1418 /* go through current modes checking for the new probed mode */
1419 list_for_each_entry(mode, &connector->modes, head) {
1420 if (!drm_mode_equal(pmode, mode))
1421 continue;
1422
1423 found_it = true;
1424
1425 /*
1426 * If the old matching mode is stale (ie. left over
1427 * from a previous probe) just replace it outright.
1428 * Otherwise just merge the type bits between all
1429 * equal probed modes.
1430 *
1431 * If two probed modes are considered equal, pick the
1432 * actual timings from the one that's marked as
1433 * preferred (in case the match isn't 100%). If
1434 * multiple or zero preferred modes are present, favor
1435 * the mode added to the probed_modes list first.
1436 */
1437 if (mode->status == MODE_STALE) {
1438 drm_mode_copy(mode, pmode);
1439 } else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1440 (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1441 pmode->type |= mode->type;
1442 drm_mode_copy(mode, pmode);
1443 } else {
1444 mode->type |= pmode->type;
1445 }
1446
1447 list_del(&pmode->head);
1448 drm_mode_destroy(connector->dev, pmode);
1449 break;
1450 }
1451
1452 if (!found_it) {
1453 list_move_tail(&pmode->head, &connector->modes);
1454 }
1455 }
1456}
1457EXPORT_SYMBOL(drm_connector_list_update);
1458
1459static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
1460 struct drm_cmdline_mode *mode)
1461{
1462 unsigned int bpp;
1463
1464 if (str[0] != '-')
1465 return -EINVAL;
1466
1467 str++;
1468 bpp = simple_strtol(str, end_ptr, 10);
1469 if (*end_ptr == str)
1470 return -EINVAL;
1471
1472 mode->bpp = bpp;
1473 mode->bpp_specified = true;
1474
1475 return 0;
1476}
1477
1478static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
1479 struct drm_cmdline_mode *mode)
1480{
1481 unsigned int refresh;
1482
1483 if (str[0] != '@')
1484 return -EINVAL;
1485
1486 str++;
1487 refresh = simple_strtol(str, end_ptr, 10);
1488 if (*end_ptr == str)
1489 return -EINVAL;
1490
1491 mode->refresh = refresh;
1492 mode->refresh_specified = true;
1493
1494 return 0;
1495}
1496
1497static int drm_mode_parse_cmdline_extra(const char *str, int length,
1498 bool freestanding,
1499 const struct drm_connector *connector,
1500 struct drm_cmdline_mode *mode)
1501{
1502 int i;
1503
1504 for (i = 0; i < length; i++) {
1505 switch (str[i]) {
1506 case 'i':
1507 if (freestanding)
1508 return -EINVAL;
1509
1510 mode->interlace = true;
1511 break;
1512 case 'm':
1513 if (freestanding)
1514 return -EINVAL;
1515
1516 mode->margins = true;
1517 break;
1518 case 'D':
1519 if (mode->force != DRM_FORCE_UNSPECIFIED)
1520 return -EINVAL;
1521
1522 if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1523 (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1524 mode->force = DRM_FORCE_ON;
1525 else
1526 mode->force = DRM_FORCE_ON_DIGITAL;
1527 break;
1528 case 'd':
1529 if (mode->force != DRM_FORCE_UNSPECIFIED)
1530 return -EINVAL;
1531
1532 mode->force = DRM_FORCE_OFF;
1533 break;
1534 case 'e':
1535 if (mode->force != DRM_FORCE_UNSPECIFIED)
1536 return -EINVAL;
1537
1538 mode->force = DRM_FORCE_ON;
1539 break;
1540 default:
1541 return -EINVAL;
1542 }
1543 }
1544
1545 return 0;
1546}
1547
1548static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
1549 bool extras,
1550 const struct drm_connector *connector,
1551 struct drm_cmdline_mode *mode)
1552{
1553 const char *str_start = str;
1554 bool rb = false, cvt = false;
1555 int xres = 0, yres = 0;
1556 int remaining, i;
1557 char *end_ptr;
1558
1559 xres = simple_strtol(str, &end_ptr, 10);
1560 if (end_ptr == str)
1561 return -EINVAL;
1562
1563 if (end_ptr[0] != 'x')
1564 return -EINVAL;
1565 end_ptr++;
1566
1567 str = end_ptr;
1568 yres = simple_strtol(str, &end_ptr, 10);
1569 if (end_ptr == str)
1570 return -EINVAL;
1571
1572 remaining = length - (end_ptr - str_start);
1573 if (remaining < 0)
1574 return -EINVAL;
1575
1576 for (i = 0; i < remaining; i++) {
1577 switch (end_ptr[i]) {
1578 case 'M':
1579 cvt = true;
1580 break;
1581 case 'R':
1582 rb = true;
1583 break;
1584 default:
1585 /*
1586 * Try to pass that to our extras parsing
1587 * function to handle the case where the
1588 * extras are directly after the resolution
1589 */
1590 if (extras) {
1591 int ret = drm_mode_parse_cmdline_extra(end_ptr + i,
1592 1,
1593 false,
1594 connector,
1595 mode);
1596 if (ret)
1597 return ret;
1598 } else {
1599 return -EINVAL;
1600 }
1601 }
1602 }
1603
1604 mode->xres = xres;
1605 mode->yres = yres;
1606 mode->cvt = cvt;
1607 mode->rb = rb;
1608
1609 return 0;
1610}
1611
1612static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret)
1613{
1614 const char *value;
1615 char *endp;
1616
1617 /*
1618 * delim must point to the '=', otherwise it is a syntax error and
1619 * if delim points to the terminating zero, then delim + 1 will point
1620 * past the end of the string.
1621 */
1622 if (*delim != '=')
1623 return -EINVAL;
1624
1625 value = delim + 1;
1626 *int_ret = simple_strtol(value, &endp, 10);
1627
1628 /* Make sure we have parsed something */
1629 if (endp == value)
1630 return -EINVAL;
1631
1632 return 0;
1633}
1634
1635static int drm_mode_parse_panel_orientation(const char *delim,
1636 struct drm_cmdline_mode *mode)
1637{
1638 const char *value;
1639
1640 if (*delim != '=')
1641 return -EINVAL;
1642
1643 value = delim + 1;
1644 delim = strchr(value, ',');
1645 if (!delim)
1646 delim = value + strlen(value);
1647
1648 if (!strncmp(value, "normal", delim - value))
1649 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
1650 else if (!strncmp(value, "upside_down", delim - value))
1651 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
1652 else if (!strncmp(value, "left_side_up", delim - value))
1653 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
1654 else if (!strncmp(value, "right_side_up", delim - value))
1655 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
1656 else
1657 return -EINVAL;
1658
1659 return 0;
1660}
1661
1662static int drm_mode_parse_cmdline_options(const char *str,
1663 bool freestanding,
1664 const struct drm_connector *connector,
1665 struct drm_cmdline_mode *mode)
1666{
1667 unsigned int deg, margin, rotation = 0;
1668 const char *delim, *option, *sep;
1669
1670 option = str;
1671 do {
1672 delim = strchr(option, '=');
1673 if (!delim) {
1674 delim = strchr(option, ',');
1675
1676 if (!delim)
1677 delim = option + strlen(option);
1678 }
1679
1680 if (!strncmp(option, "rotate", delim - option)) {
1681 if (drm_mode_parse_cmdline_int(delim, &deg))
1682 return -EINVAL;
1683
1684 switch (deg) {
1685 case 0:
1686 rotation |= DRM_MODE_ROTATE_0;
1687 break;
1688
1689 case 90:
1690 rotation |= DRM_MODE_ROTATE_90;
1691 break;
1692
1693 case 180:
1694 rotation |= DRM_MODE_ROTATE_180;
1695 break;
1696
1697 case 270:
1698 rotation |= DRM_MODE_ROTATE_270;
1699 break;
1700
1701 default:
1702 return -EINVAL;
1703 }
1704 } else if (!strncmp(option, "reflect_x", delim - option)) {
1705 rotation |= DRM_MODE_REFLECT_X;
1706 } else if (!strncmp(option, "reflect_y", delim - option)) {
1707 rotation |= DRM_MODE_REFLECT_Y;
1708 } else if (!strncmp(option, "margin_right", delim - option)) {
1709 if (drm_mode_parse_cmdline_int(delim, &margin))
1710 return -EINVAL;
1711
1712 mode->tv_margins.right = margin;
1713 } else if (!strncmp(option, "margin_left", delim - option)) {
1714 if (drm_mode_parse_cmdline_int(delim, &margin))
1715 return -EINVAL;
1716
1717 mode->tv_margins.left = margin;
1718 } else if (!strncmp(option, "margin_top", delim - option)) {
1719 if (drm_mode_parse_cmdline_int(delim, &margin))
1720 return -EINVAL;
1721
1722 mode->tv_margins.top = margin;
1723 } else if (!strncmp(option, "margin_bottom", delim - option)) {
1724 if (drm_mode_parse_cmdline_int(delim, &margin))
1725 return -EINVAL;
1726
1727 mode->tv_margins.bottom = margin;
1728 } else if (!strncmp(option, "panel_orientation", delim - option)) {
1729 if (drm_mode_parse_panel_orientation(delim, mode))
1730 return -EINVAL;
1731 } else {
1732 return -EINVAL;
1733 }
1734 sep = strchr(delim, ',');
1735 option = sep + 1;
1736 } while (sep);
1737
1738 if (rotation && freestanding)
1739 return -EINVAL;
1740
1741 if (!(rotation & DRM_MODE_ROTATE_MASK))
1742 rotation |= DRM_MODE_ROTATE_0;
1743
1744 /* Make sure there is exactly one rotation defined */
1745 if (!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK))
1746 return -EINVAL;
1747
1748 mode->rotation_reflection = rotation;
1749
1750 return 0;
1751}
1752
1753static const char * const drm_named_modes_whitelist[] = {
1754 "NTSC",
1755 "PAL",
1756};
1757
1758/**
1759 * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
1760 * @mode_option: optional per connector mode option
1761 * @connector: connector to parse modeline for
1762 * @mode: preallocated drm_cmdline_mode structure to fill out
1763 *
1764 * This parses @mode_option command line modeline for modes and options to
1765 * configure the connector. If @mode_option is NULL the default command line
1766 * modeline in fb_mode_option will be parsed instead.
1767 *
1768 * This uses the same parameters as the fb modedb.c, except for an extra
1769 * force-enable, force-enable-digital and force-disable bit at the end::
1770 *
1771 * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1772 *
1773 * Additionals options can be provided following the mode, using a comma to
1774 * separate each option. Valid options can be found in
1775 * Documentation/fb/modedb.rst.
1776 *
1777 * The intermediate drm_cmdline_mode structure is required to store additional
1778 * options from the command line modline like the force-enable/disable flag.
1779 *
1780 * Returns:
1781 * True if a valid modeline has been parsed, false otherwise.
1782 */
1783bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1784 const struct drm_connector *connector,
1785 struct drm_cmdline_mode *mode)
1786{
1787 const char *name;
1788 bool freestanding = false, parse_extras = false;
1789 unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
1790 unsigned int mode_end = 0;
1791 const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
1792 const char *options_ptr = NULL;
1793 char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
1794 int i, len, ret;
1795
1796 memset(mode, 0, sizeof(*mode));
1797 mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
1798
1799 if (!mode_option)
1800 return false;
1801
1802 name = mode_option;
1803
1804 /* Try to locate the bpp and refresh specifiers, if any */
1805 bpp_ptr = strchr(name, '-');
1806 if (bpp_ptr)
1807 bpp_off = bpp_ptr - name;
1808
1809 refresh_ptr = strchr(name, '@');
1810 if (refresh_ptr)
1811 refresh_off = refresh_ptr - name;
1812
1813 /* Locate the start of named options */
1814 options_ptr = strchr(name, ',');
1815 if (options_ptr)
1816 options_off = options_ptr - name;
1817
1818 /* Locate the end of the name / resolution, and parse it */
1819 if (bpp_ptr) {
1820 mode_end = bpp_off;
1821 } else if (refresh_ptr) {
1822 mode_end = refresh_off;
1823 } else if (options_ptr) {
1824 mode_end = options_off;
1825 parse_extras = true;
1826 } else {
1827 mode_end = strlen(name);
1828 parse_extras = true;
1829 }
1830
1831 /* First check for a named mode */
1832 for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++) {
1833 ret = str_has_prefix(name, drm_named_modes_whitelist[i]);
1834 if (ret == mode_end) {
1835 if (refresh_ptr)
1836 return false; /* named + refresh is invalid */
1837
1838 strcpy(mode->name, drm_named_modes_whitelist[i]);
1839 mode->specified = true;
1840 break;
1841 }
1842 }
1843
1844 /* No named mode? Check for a normal mode argument, e.g. 1024x768 */
1845 if (!mode->specified && isdigit(name[0])) {
1846 ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
1847 parse_extras,
1848 connector,
1849 mode);
1850 if (ret)
1851 return false;
1852
1853 mode->specified = true;
1854 }
1855
1856 /* No mode? Check for freestanding extras and/or options */
1857 if (!mode->specified) {
1858 unsigned int len = strlen(mode_option);
1859
1860 if (bpp_ptr || refresh_ptr)
1861 return false; /* syntax error */
1862
1863 if (len == 1 || (len >= 2 && mode_option[1] == ','))
1864 extra_ptr = mode_option;
1865 else
1866 options_ptr = mode_option - 1;
1867
1868 freestanding = true;
1869 }
1870
1871 if (bpp_ptr) {
1872 ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode);
1873 if (ret)
1874 return false;
1875
1876 mode->bpp_specified = true;
1877 }
1878
1879 if (refresh_ptr) {
1880 ret = drm_mode_parse_cmdline_refresh(refresh_ptr,
1881 &refresh_end_ptr, mode);
1882 if (ret)
1883 return false;
1884
1885 mode->refresh_specified = true;
1886 }
1887
1888 /*
1889 * Locate the end of the bpp / refresh, and parse the extras
1890 * if relevant
1891 */
1892 if (bpp_ptr && refresh_ptr)
1893 extra_ptr = max(bpp_end_ptr, refresh_end_ptr);
1894 else if (bpp_ptr)
1895 extra_ptr = bpp_end_ptr;
1896 else if (refresh_ptr)
1897 extra_ptr = refresh_end_ptr;
1898
1899 if (extra_ptr) {
1900 if (options_ptr)
1901 len = options_ptr - extra_ptr;
1902 else
1903 len = strlen(extra_ptr);
1904
1905 ret = drm_mode_parse_cmdline_extra(extra_ptr, len, freestanding,
1906 connector, mode);
1907 if (ret)
1908 return false;
1909 }
1910
1911 if (options_ptr) {
1912 ret = drm_mode_parse_cmdline_options(options_ptr + 1,
1913 freestanding,
1914 connector, mode);
1915 if (ret)
1916 return false;
1917 }
1918
1919 return true;
1920}
1921EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1922
1923/**
1924 * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
1925 * @dev: DRM device to create the new mode for
1926 * @cmd: input command line modeline
1927 *
1928 * Returns:
1929 * Pointer to converted mode on success, NULL on error.
1930 */
1931struct drm_display_mode *
1932drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1933 struct drm_cmdline_mode *cmd)
1934{
1935 struct drm_display_mode *mode;
1936
1937 if (cmd->xres == 0 || cmd->yres == 0)
1938 return NULL;
1939
1940 if (cmd->cvt)
1941 mode = drm_cvt_mode(dev,
1942 cmd->xres, cmd->yres,
1943 cmd->refresh_specified ? cmd->refresh : 60,
1944 cmd->rb, cmd->interlace,
1945 cmd->margins);
1946 else
1947 mode = drm_gtf_mode(dev,
1948 cmd->xres, cmd->yres,
1949 cmd->refresh_specified ? cmd->refresh : 60,
1950 cmd->interlace,
1951 cmd->margins);
1952 if (!mode)
1953 return NULL;
1954
1955 mode->type |= DRM_MODE_TYPE_USERDEF;
1956 /* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
1957 if (cmd->xres == 1366)
1958 drm_mode_fixup_1366x768(mode);
1959 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1960 return mode;
1961}
1962EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
1963
1964/**
1965 * drm_mode_convert_to_umode - convert a drm_display_mode into a modeinfo
1966 * @out: drm_mode_modeinfo struct to return to the user
1967 * @in: drm_display_mode to use
1968 *
1969 * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
1970 * the user.
1971 */
1972void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
1973 const struct drm_display_mode *in)
1974{
1975 out->clock = in->clock;
1976 out->hdisplay = in->hdisplay;
1977 out->hsync_start = in->hsync_start;
1978 out->hsync_end = in->hsync_end;
1979 out->htotal = in->htotal;
1980 out->hskew = in->hskew;
1981 out->vdisplay = in->vdisplay;
1982 out->vsync_start = in->vsync_start;
1983 out->vsync_end = in->vsync_end;
1984 out->vtotal = in->vtotal;
1985 out->vscan = in->vscan;
1986 out->vrefresh = drm_mode_vrefresh(in);
1987 out->flags = in->flags;
1988 out->type = in->type;
1989
1990 switch (in->picture_aspect_ratio) {
1991 case HDMI_PICTURE_ASPECT_4_3:
1992 out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
1993 break;
1994 case HDMI_PICTURE_ASPECT_16_9:
1995 out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
1996 break;
1997 case HDMI_PICTURE_ASPECT_64_27:
1998 out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
1999 break;
2000 case HDMI_PICTURE_ASPECT_256_135:
2001 out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
2002 break;
2003 default:
2004 WARN(1, "Invalid aspect ratio (0%x) on mode\n",
2005 in->picture_aspect_ratio);
2006 fallthrough;
2007 case HDMI_PICTURE_ASPECT_NONE:
2008 out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
2009 break;
2010 }
2011
2012 strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
2013 out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
2014}
2015
2016/**
2017 * drm_mode_convert_umode - convert a modeinfo into a drm_display_mode
2018 * @dev: drm device
2019 * @out: drm_display_mode to return to the user
2020 * @in: drm_mode_modeinfo to use
2021 *
2022 * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
2023 * the caller.
2024 *
2025 * Returns:
2026 * Zero on success, negative errno on failure.
2027 */
2028int drm_mode_convert_umode(struct drm_device *dev,
2029 struct drm_display_mode *out,
2030 const struct drm_mode_modeinfo *in)
2031{
2032 if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
2033 return -ERANGE;
2034
2035 out->clock = in->clock;
2036 out->hdisplay = in->hdisplay;
2037 out->hsync_start = in->hsync_start;
2038 out->hsync_end = in->hsync_end;
2039 out->htotal = in->htotal;
2040 out->hskew = in->hskew;
2041 out->vdisplay = in->vdisplay;
2042 out->vsync_start = in->vsync_start;
2043 out->vsync_end = in->vsync_end;
2044 out->vtotal = in->vtotal;
2045 out->vscan = in->vscan;
2046 out->flags = in->flags;
2047 /*
2048 * Old xf86-video-vmware (possibly others too) used to
2049 * leave 'type' uninitialized. Just ignore any bits we
2050 * don't like. It's a just hint after all, and more
2051 * useful for the kernel->userspace direction anyway.
2052 */
2053 out->type = in->type & DRM_MODE_TYPE_ALL;
2054 strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
2055 out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
2056
2057 /* Clearing picture aspect ratio bits from out flags,
2058 * as the aspect-ratio information is not stored in
2059 * flags for kernel-mode, but in picture_aspect_ratio.
2060 */
2061 out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
2062
2063 switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
2064 case DRM_MODE_FLAG_PIC_AR_4_3:
2065 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
2066 break;
2067 case DRM_MODE_FLAG_PIC_AR_16_9:
2068 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
2069 break;
2070 case DRM_MODE_FLAG_PIC_AR_64_27:
2071 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27;
2072 break;
2073 case DRM_MODE_FLAG_PIC_AR_256_135:
2074 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_256_135;
2075 break;
2076 case DRM_MODE_FLAG_PIC_AR_NONE:
2077 out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
2078 break;
2079 default:
2080 return -EINVAL;
2081 }
2082
2083 out->status = drm_mode_validate_driver(dev, out);
2084 if (out->status != MODE_OK)
2085 return -EINVAL;
2086
2087 drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
2088
2089 return 0;
2090}
2091
2092/**
2093 * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
2094 * output format
2095 *
2096 * @display: display under action
2097 * @mode: video mode to be tested.
2098 *
2099 * Returns:
2100 * true if the mode can be supported in YCBCR420 format
2101 * false if not.
2102 */
2103bool drm_mode_is_420_only(const struct drm_display_info *display,
2104 const struct drm_display_mode *mode)
2105{
2106 u8 vic = drm_match_cea_mode(mode);
2107
2108 return test_bit(vic, display->hdmi.y420_vdb_modes);
2109}
2110EXPORT_SYMBOL(drm_mode_is_420_only);
2111
2112/**
2113 * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
2114 * output format also (along with RGB/YCBCR444/422)
2115 *
2116 * @display: display under action.
2117 * @mode: video mode to be tested.
2118 *
2119 * Returns:
2120 * true if the mode can be support YCBCR420 format
2121 * false if not.
2122 */
2123bool drm_mode_is_420_also(const struct drm_display_info *display,
2124 const struct drm_display_mode *mode)
2125{
2126 u8 vic = drm_match_cea_mode(mode);
2127
2128 return test_bit(vic, display->hdmi.y420_cmdb_modes);
2129}
2130EXPORT_SYMBOL(drm_mode_is_420_also);
2131/**
2132 * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
2133 * output format
2134 *
2135 * @display: display under action.
2136 * @mode: video mode to be tested.
2137 *
2138 * Returns:
2139 * true if the mode can be supported in YCBCR420 format
2140 * false if not.
2141 */
2142bool drm_mode_is_420(const struct drm_display_info *display,
2143 const struct drm_display_mode *mode)
2144{
2145 return drm_mode_is_420_only(display, mode) ||
2146 drm_mode_is_420_also(display, mode);
2147}
2148EXPORT_SYMBOL(drm_mode_is_420);
2149

source code of linux/drivers/gpu/drm/drm_modes.c