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 */
drm_mode_debug_printmodeline(const struct drm_display_mode * mode)50 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
51 {
52 DRM_DEBUG_KMS("Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d "
53 "0x%x 0x%x\n",
54 mode->base.id, mode->name, mode->vrefresh, mode->clock,
55 mode->hdisplay, mode->hsync_start,
56 mode->hsync_end, mode->htotal,
57 mode->vdisplay, mode->vsync_start,
58 mode->vsync_end, mode->vtotal, mode->type, mode->flags);
59 }
60 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
61
62 /**
63 * drm_mode_create - create a new display mode
64 * @dev: DRM device
65 *
66 * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
67 * and return it.
68 *
69 * Returns:
70 * Pointer to new mode on success, NULL on error.
71 */
drm_mode_create(struct drm_device * dev)72 struct drm_display_mode *drm_mode_create(struct drm_device *dev)
73 {
74 struct drm_display_mode *nmode;
75
76 nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
77 if (!nmode)
78 return NULL;
79
80 if (drm_mode_object_get(dev, &nmode->base, DRM_MODE_OBJECT_MODE)) {
81 kfree(nmode);
82 return NULL;
83 }
84
85 return nmode;
86 }
87 EXPORT_SYMBOL(drm_mode_create);
88
89 /**
90 * drm_mode_destroy - remove a mode
91 * @dev: DRM device
92 * @mode: mode to remove
93 *
94 * Release @mode's unique ID, then free it @mode structure itself using kfree.
95 */
drm_mode_destroy(struct drm_device * dev,struct drm_display_mode * mode)96 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
97 {
98 if (!mode)
99 return;
100
101 drm_mode_object_put(dev, &mode->base);
102
103 kfree(mode);
104 }
105 EXPORT_SYMBOL(drm_mode_destroy);
106
107 /**
108 * drm_mode_probed_add - add a mode to a connector's probed_mode list
109 * @connector: connector the new mode
110 * @mode: mode data
111 *
112 * Add @mode to @connector's probed_mode list for later use. This list should
113 * then in a second step get filtered and all the modes actually supported by
114 * the hardware moved to the @connector's modes list.
115 */
drm_mode_probed_add(struct drm_connector * connector,struct drm_display_mode * mode)116 void drm_mode_probed_add(struct drm_connector *connector,
117 struct drm_display_mode *mode)
118 {
119 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
120
121 list_add_tail(&mode->head, &connector->probed_modes);
122 }
123 EXPORT_SYMBOL(drm_mode_probed_add);
124
125 /**
126 * drm_cvt_mode -create a modeline based on the CVT algorithm
127 * @dev: drm device
128 * @hdisplay: hdisplay size
129 * @vdisplay: vdisplay size
130 * @vrefresh: vrefresh rate
131 * @reduced: whether to use reduced blanking
132 * @interlaced: whether to compute an interlaced mode
133 * @margins: whether to add margins (borders)
134 *
135 * This function is called to generate the modeline based on CVT algorithm
136 * according to the hdisplay, vdisplay, vrefresh.
137 * It is based from the VESA(TM) Coordinated Video Timing Generator by
138 * Graham Loveridge April 9, 2003 available at
139 * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
140 *
141 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
142 * What I have done is to translate it by using integer calculation.
143 *
144 * Returns:
145 * The modeline based on the CVT algorithm stored in a drm_display_mode object.
146 * The display mode object is allocated with drm_mode_create(). Returns NULL
147 * when no mode could be allocated.
148 */
drm_cvt_mode(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool reduced,bool interlaced,bool margins)149 struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
150 int vdisplay, int vrefresh,
151 bool reduced, bool interlaced, bool margins)
152 {
153 #define HV_FACTOR 1000
154 /* 1) top/bottom margin size (% of height) - default: 1.8, */
155 #define CVT_MARGIN_PERCENTAGE 18
156 /* 2) character cell horizontal granularity (pixels) - default 8 */
157 #define CVT_H_GRANULARITY 8
158 /* 3) Minimum vertical porch (lines) - default 3 */
159 #define CVT_MIN_V_PORCH 3
160 /* 4) Minimum number of vertical back porch lines - default 6 */
161 #define CVT_MIN_V_BPORCH 6
162 /* Pixel Clock step (kHz) */
163 #define CVT_CLOCK_STEP 250
164 struct drm_display_mode *drm_mode;
165 unsigned int vfieldrate, hperiod;
166 int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
167 int interlace;
168
169 /* allocate the drm_display_mode structure. If failure, we will
170 * return directly
171 */
172 drm_mode = drm_mode_create(dev);
173 if (!drm_mode)
174 return NULL;
175
176 /* the CVT default refresh rate is 60Hz */
177 if (!vrefresh)
178 vrefresh = 60;
179
180 /* the required field fresh rate */
181 if (interlaced)
182 vfieldrate = vrefresh * 2;
183 else
184 vfieldrate = vrefresh;
185
186 /* horizontal pixels */
187 hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
188
189 /* determine the left&right borders */
190 hmargin = 0;
191 if (margins) {
192 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
193 hmargin -= hmargin % CVT_H_GRANULARITY;
194 }
195 /* find the total active pixels */
196 drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
197
198 /* find the number of lines per field */
199 if (interlaced)
200 vdisplay_rnd = vdisplay / 2;
201 else
202 vdisplay_rnd = vdisplay;
203
204 /* find the top & bottom borders */
205 vmargin = 0;
206 if (margins)
207 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
208
209 drm_mode->vdisplay = vdisplay + 2 * vmargin;
210
211 /* Interlaced */
212 if (interlaced)
213 interlace = 1;
214 else
215 interlace = 0;
216
217 /* Determine VSync Width from aspect ratio */
218 if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
219 vsync = 4;
220 else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
221 vsync = 5;
222 else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
223 vsync = 6;
224 else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
225 vsync = 7;
226 else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
227 vsync = 7;
228 else /* custom */
229 vsync = 10;
230
231 if (!reduced) {
232 /* simplify the GTF calculation */
233 /* 4) Minimum time of vertical sync + back porch interval (µs)
234 * default 550.0
235 */
236 int tmp1, tmp2;
237 #define CVT_MIN_VSYNC_BP 550
238 /* 3) Nominal HSync width (% of line period) - default 8 */
239 #define CVT_HSYNC_PERCENTAGE 8
240 unsigned int hblank_percentage;
241 int vsyncandback_porch, vback_porch, hblank;
242
243 /* estimated the horizontal period */
244 tmp1 = HV_FACTOR * 1000000 -
245 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
246 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
247 interlace;
248 hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
249
250 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
251 /* 9. Find number of lines in sync + backporch */
252 if (tmp1 < (vsync + CVT_MIN_V_PORCH))
253 vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
254 else
255 vsyncandback_porch = tmp1;
256 /* 10. Find number of lines in back porch */
257 vback_porch = vsyncandback_porch - vsync;
258 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
259 vsyncandback_porch + CVT_MIN_V_PORCH;
260 /* 5) Definition of Horizontal blanking time limitation */
261 /* Gradient (%/kHz) - default 600 */
262 #define CVT_M_FACTOR 600
263 /* Offset (%) - default 40 */
264 #define CVT_C_FACTOR 40
265 /* Blanking time scaling factor - default 128 */
266 #define CVT_K_FACTOR 128
267 /* Scaling factor weighting - default 20 */
268 #define CVT_J_FACTOR 20
269 #define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256)
270 #define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
271 CVT_J_FACTOR)
272 /* 12. Find ideal blanking duty cycle from formula */
273 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
274 hperiod / 1000;
275 /* 13. Blanking time */
276 if (hblank_percentage < 20 * HV_FACTOR)
277 hblank_percentage = 20 * HV_FACTOR;
278 hblank = drm_mode->hdisplay * hblank_percentage /
279 (100 * HV_FACTOR - hblank_percentage);
280 hblank -= hblank % (2 * CVT_H_GRANULARITY);
281 /* 14. find the total pixels per line */
282 drm_mode->htotal = drm_mode->hdisplay + hblank;
283 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
284 drm_mode->hsync_start = drm_mode->hsync_end -
285 (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
286 drm_mode->hsync_start += CVT_H_GRANULARITY -
287 drm_mode->hsync_start % CVT_H_GRANULARITY;
288 /* fill the Vsync values */
289 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
290 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
291 } else {
292 /* Reduced blanking */
293 /* Minimum vertical blanking interval time (µs)- default 460 */
294 #define CVT_RB_MIN_VBLANK 460
295 /* Fixed number of clocks for horizontal sync */
296 #define CVT_RB_H_SYNC 32
297 /* Fixed number of clocks for horizontal blanking */
298 #define CVT_RB_H_BLANK 160
299 /* Fixed number of lines for vertical front porch - default 3*/
300 #define CVT_RB_VFPORCH 3
301 int vbilines;
302 int tmp1, tmp2;
303 /* 8. Estimate Horizontal period. */
304 tmp1 = HV_FACTOR * 1000000 -
305 CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
306 tmp2 = vdisplay_rnd + 2 * vmargin;
307 hperiod = tmp1 / (tmp2 * vfieldrate);
308 /* 9. Find number of lines in vertical blanking */
309 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
310 /* 10. Check if vertical blanking is sufficient */
311 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
312 vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
313 /* 11. Find total number of lines in vertical field */
314 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
315 /* 12. Find total number of pixels in a line */
316 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
317 /* Fill in HSync values */
318 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
319 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
320 /* Fill in VSync values */
321 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
322 drm_mode->vsync_end = drm_mode->vsync_start + vsync;
323 }
324 /* 15/13. Find pixel clock frequency (kHz for xf86) */
325 drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;
326 drm_mode->clock -= drm_mode->clock % CVT_CLOCK_STEP;
327 /* 18/16. Find actual vertical frame frequency */
328 /* ignore - just set the mode flag for interlaced */
329 if (interlaced) {
330 drm_mode->vtotal *= 2;
331 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
332 }
333 /* Fill the mode line name */
334 drm_mode_set_name(drm_mode);
335 if (reduced)
336 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
337 DRM_MODE_FLAG_NVSYNC);
338 else
339 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
340 DRM_MODE_FLAG_NHSYNC);
341
342 return drm_mode;
343 }
344 EXPORT_SYMBOL(drm_cvt_mode);
345
346 /**
347 * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
348 * @dev: drm device
349 * @hdisplay: hdisplay size
350 * @vdisplay: vdisplay size
351 * @vrefresh: vrefresh rate.
352 * @interlaced: whether to compute an interlaced mode
353 * @margins: desired margin (borders) size
354 * @GTF_M: extended GTF formula parameters
355 * @GTF_2C: extended GTF formula parameters
356 * @GTF_K: extended GTF formula parameters
357 * @GTF_2J: extended GTF formula parameters
358 *
359 * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
360 * in here multiplied by two. For a C of 40, pass in 80.
361 *
362 * Returns:
363 * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
364 * The display mode object is allocated with drm_mode_create(). Returns NULL
365 * when no mode could be allocated.
366 */
367 struct drm_display_mode *
drm_gtf_mode_complex(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool interlaced,int margins,int GTF_M,int GTF_2C,int GTF_K,int GTF_2J)368 drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
369 int vrefresh, bool interlaced, int margins,
370 int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
371 { /* 1) top/bottom margin size (% of height) - default: 1.8, */
372 #define GTF_MARGIN_PERCENTAGE 18
373 /* 2) character cell horizontal granularity (pixels) - default 8 */
374 #define GTF_CELL_GRAN 8
375 /* 3) Minimum vertical porch (lines) - default 3 */
376 #define GTF_MIN_V_PORCH 1
377 /* width of vsync in lines */
378 #define V_SYNC_RQD 3
379 /* width of hsync as % of total line */
380 #define H_SYNC_PERCENT 8
381 /* min time of vsync + back porch (microsec) */
382 #define MIN_VSYNC_PLUS_BP 550
383 /* C' and M' are part of the Blanking Duty Cycle computation */
384 #define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
385 #define GTF_M_PRIME (GTF_K * GTF_M / 256)
386 struct drm_display_mode *drm_mode;
387 unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
388 int top_margin, bottom_margin;
389 int interlace;
390 unsigned int hfreq_est;
391 int vsync_plus_bp, vback_porch;
392 unsigned int vtotal_lines, vfieldrate_est, hperiod;
393 unsigned int vfield_rate, vframe_rate;
394 int left_margin, right_margin;
395 unsigned int total_active_pixels, ideal_duty_cycle;
396 unsigned int hblank, total_pixels, pixel_freq;
397 int hsync, hfront_porch, vodd_front_porch_lines;
398 unsigned int tmp1, tmp2;
399
400 drm_mode = drm_mode_create(dev);
401 if (!drm_mode)
402 return NULL;
403
404 /* 1. In order to give correct results, the number of horizontal
405 * pixels requested is first processed to ensure that it is divisible
406 * by the character size, by rounding it to the nearest character
407 * cell boundary:
408 */
409 hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
410 hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
411
412 /* 2. If interlace is requested, the number of vertical lines assumed
413 * by the calculation must be halved, as the computation calculates
414 * the number of vertical lines per field.
415 */
416 if (interlaced)
417 vdisplay_rnd = vdisplay / 2;
418 else
419 vdisplay_rnd = vdisplay;
420
421 /* 3. Find the frame rate required: */
422 if (interlaced)
423 vfieldrate_rqd = vrefresh * 2;
424 else
425 vfieldrate_rqd = vrefresh;
426
427 /* 4. Find number of lines in Top margin: */
428 top_margin = 0;
429 if (margins)
430 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
431 1000;
432 /* 5. Find number of lines in bottom margin: */
433 bottom_margin = top_margin;
434
435 /* 6. If interlace is required, then set variable interlace: */
436 if (interlaced)
437 interlace = 1;
438 else
439 interlace = 0;
440
441 /* 7. Estimate the Horizontal frequency */
442 {
443 tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
444 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
445 2 + interlace;
446 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
447 }
448
449 /* 8. Find the number of lines in V sync + back porch */
450 /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
451 vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
452 vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
453 /* 9. Find the number of lines in V back porch alone: */
454 vback_porch = vsync_plus_bp - V_SYNC_RQD;
455 /* 10. Find the total number of lines in Vertical field period: */
456 vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
457 vsync_plus_bp + GTF_MIN_V_PORCH;
458 /* 11. Estimate the Vertical field frequency: */
459 vfieldrate_est = hfreq_est / vtotal_lines;
460 /* 12. Find the actual horizontal period: */
461 hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
462
463 /* 13. Find the actual Vertical field frequency: */
464 vfield_rate = hfreq_est / vtotal_lines;
465 /* 14. Find the Vertical frame frequency: */
466 if (interlaced)
467 vframe_rate = vfield_rate / 2;
468 else
469 vframe_rate = vfield_rate;
470 /* 15. Find number of pixels in left margin: */
471 if (margins)
472 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
473 1000;
474 else
475 left_margin = 0;
476
477 /* 16.Find number of pixels in right margin: */
478 right_margin = left_margin;
479 /* 17.Find total number of active pixels in image and left and right */
480 total_active_pixels = hdisplay_rnd + left_margin + right_margin;
481 /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
482 ideal_duty_cycle = GTF_C_PRIME * 1000 -
483 (GTF_M_PRIME * 1000000 / hfreq_est);
484 /* 19.Find the number of pixels in the blanking time to the nearest
485 * double character cell: */
486 hblank = total_active_pixels * ideal_duty_cycle /
487 (100000 - ideal_duty_cycle);
488 hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
489 hblank = hblank * 2 * GTF_CELL_GRAN;
490 /* 20.Find total number of pixels: */
491 total_pixels = total_active_pixels + hblank;
492 /* 21.Find pixel clock frequency: */
493 pixel_freq = total_pixels * hfreq_est / 1000;
494 /* Stage 1 computations are now complete; I should really pass
495 * the results to another function and do the Stage 2 computations,
496 * but I only need a few more values so I'll just append the
497 * computations here for now */
498 /* 17. Find the number of pixels in the horizontal sync period: */
499 hsync = H_SYNC_PERCENT * total_pixels / 100;
500 hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
501 hsync = hsync * GTF_CELL_GRAN;
502 /* 18. Find the number of pixels in horizontal front porch period */
503 hfront_porch = hblank / 2 - hsync;
504 /* 36. Find the number of lines in the odd front porch period: */
505 vodd_front_porch_lines = GTF_MIN_V_PORCH ;
506
507 /* finally, pack the results in the mode struct */
508 drm_mode->hdisplay = hdisplay_rnd;
509 drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
510 drm_mode->hsync_end = drm_mode->hsync_start + hsync;
511 drm_mode->htotal = total_pixels;
512 drm_mode->vdisplay = vdisplay_rnd;
513 drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
514 drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
515 drm_mode->vtotal = vtotal_lines;
516
517 drm_mode->clock = pixel_freq;
518
519 if (interlaced) {
520 drm_mode->vtotal *= 2;
521 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
522 }
523
524 drm_mode_set_name(drm_mode);
525 if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
526 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
527 else
528 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
529
530 return drm_mode;
531 }
532 EXPORT_SYMBOL(drm_gtf_mode_complex);
533
534 /**
535 * drm_gtf_mode - create the modeline based on the GTF algorithm
536 * @dev: drm device
537 * @hdisplay: hdisplay size
538 * @vdisplay: vdisplay size
539 * @vrefresh: vrefresh rate.
540 * @interlaced: whether to compute an interlaced mode
541 * @margins: desired margin (borders) size
542 *
543 * return the modeline based on GTF algorithm
544 *
545 * This function is to create the modeline based on the GTF algorithm.
546 * Generalized Timing Formula is derived from:
547 * GTF Spreadsheet by Andy Morrish (1/5/97)
548 * available at http://www.vesa.org
549 *
550 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
551 * What I have done is to translate it by using integer calculation.
552 * I also refer to the function of fb_get_mode in the file of
553 * drivers/video/fbmon.c
554 *
555 * Standard GTF parameters:
556 * M = 600
557 * C = 40
558 * K = 128
559 * J = 20
560 *
561 * Returns:
562 * The modeline based on the GTF algorithm stored in a drm_display_mode object.
563 * The display mode object is allocated with drm_mode_create(). Returns NULL
564 * when no mode could be allocated.
565 */
566 struct drm_display_mode *
drm_gtf_mode(struct drm_device * dev,int hdisplay,int vdisplay,int vrefresh,bool interlaced,int margins)567 drm_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 }
574 EXPORT_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 */
drm_display_mode_from_videomode(const struct videomode * vm,struct drm_display_mode * dmode)584 void 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 }
616 EXPORT_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 */
drm_display_mode_to_videomode(const struct drm_display_mode * dmode,struct videomode * vm)625 void 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 }
656 EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
657
658 #ifdef CONFIG_OF
659 /**
660 * of_get_drm_display_mode - get a drm_display_mode from devicetree
661 * @np: device_node with the timing specification
662 * @dmode: will be set to the return value
663 * @index: index into the list of display timings in devicetree
664 *
665 * This function is expensive and should only be used, if only one mode is to be
666 * read from DT. To get multiple modes start with of_get_display_timings and
667 * work with that instead.
668 *
669 * Returns:
670 * 0 on success, a negative errno code when no of videomode node was found.
671 */
of_get_drm_display_mode(struct device_node * np,struct drm_display_mode * dmode,int index)672 int of_get_drm_display_mode(struct device_node *np,
673 struct drm_display_mode *dmode, int index)
674 {
675 struct videomode vm;
676 int ret;
677
678 ret = of_get_videomode(np, &vm, index);
679 if (ret)
680 return ret;
681
682 drm_display_mode_from_videomode(&vm, dmode);
683
684 pr_debug("%s: got %dx%d display mode from %s\n",
685 of_node_full_name(np), vm.hactive, vm.vactive, np->name);
686 drm_mode_debug_printmodeline(dmode);
687
688 return 0;
689 }
690 EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
691 #endif /* CONFIG_OF */
692 #endif /* CONFIG_VIDEOMODE_HELPERS */
693
694 /**
695 * drm_mode_set_name - set the name on a mode
696 * @mode: name will be set in this mode
697 *
698 * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
699 * with an optional 'i' suffix for interlaced modes.
700 */
drm_mode_set_name(struct drm_display_mode * mode)701 void drm_mode_set_name(struct drm_display_mode *mode)
702 {
703 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
704
705 snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
706 mode->hdisplay, mode->vdisplay,
707 interlaced ? "i" : "");
708 }
709 EXPORT_SYMBOL(drm_mode_set_name);
710
711 /** drm_mode_hsync - get the hsync of a mode
712 * @mode: mode
713 *
714 * Returns:
715 * @modes's hsync rate in kHz, rounded to the nearest integer. Calculates the
716 * value first if it is not yet set.
717 */
drm_mode_hsync(const struct drm_display_mode * mode)718 int drm_mode_hsync(const struct drm_display_mode *mode)
719 {
720 unsigned int calc_val;
721
722 if (mode->hsync)
723 return mode->hsync;
724
725 if (mode->htotal <= 0)
726 return 0;
727
728 calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
729 calc_val += 500; /* round to 1000Hz */
730 calc_val /= 1000; /* truncate to kHz */
731
732 return calc_val;
733 }
734 EXPORT_SYMBOL(drm_mode_hsync);
735
736 /**
737 * drm_mode_vrefresh - get the vrefresh of a mode
738 * @mode: mode
739 *
740 * Returns:
741 * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
742 * value first if it is not yet set.
743 */
drm_mode_vrefresh(const struct drm_display_mode * mode)744 int drm_mode_vrefresh(const struct drm_display_mode *mode)
745 {
746 int refresh = 0;
747 unsigned int calc_val;
748
749 if (mode->vrefresh > 0)
750 refresh = mode->vrefresh;
751 else if (mode->htotal > 0 && mode->vtotal > 0) {
752 int vtotal;
753 vtotal = mode->vtotal;
754 /* work out vrefresh the value will be x1000 */
755 calc_val = (mode->clock * 1000);
756 calc_val /= mode->htotal;
757 refresh = (calc_val + vtotal / 2) / vtotal;
758
759 if (mode->flags & DRM_MODE_FLAG_INTERLACE)
760 refresh *= 2;
761 if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
762 refresh /= 2;
763 if (mode->vscan > 1)
764 refresh /= mode->vscan;
765 }
766 return refresh;
767 }
768 EXPORT_SYMBOL(drm_mode_vrefresh);
769
770 /**
771 * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
772 * @p: mode
773 * @adjust_flags: a combination of adjustment flags
774 *
775 * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
776 *
777 * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
778 * interlaced modes.
779 * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
780 * buffers containing two eyes (only adjust the timings when needed, eg. for
781 * "frame packing" or "side by side full").
782 * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
783 * be performed for doublescan and vscan > 1 modes respectively.
784 */
drm_mode_set_crtcinfo(struct drm_display_mode * p,int adjust_flags)785 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
786 {
787 if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
788 return;
789
790 p->crtc_clock = p->clock;
791 p->crtc_hdisplay = p->hdisplay;
792 p->crtc_hsync_start = p->hsync_start;
793 p->crtc_hsync_end = p->hsync_end;
794 p->crtc_htotal = p->htotal;
795 p->crtc_hskew = p->hskew;
796 p->crtc_vdisplay = p->vdisplay;
797 p->crtc_vsync_start = p->vsync_start;
798 p->crtc_vsync_end = p->vsync_end;
799 p->crtc_vtotal = p->vtotal;
800
801 if (p->flags & DRM_MODE_FLAG_INTERLACE) {
802 if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
803 p->crtc_vdisplay /= 2;
804 p->crtc_vsync_start /= 2;
805 p->crtc_vsync_end /= 2;
806 p->crtc_vtotal /= 2;
807 }
808 }
809
810 if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
811 if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
812 p->crtc_vdisplay *= 2;
813 p->crtc_vsync_start *= 2;
814 p->crtc_vsync_end *= 2;
815 p->crtc_vtotal *= 2;
816 }
817 }
818
819 if (!(adjust_flags & CRTC_NO_VSCAN)) {
820 if (p->vscan > 1) {
821 p->crtc_vdisplay *= p->vscan;
822 p->crtc_vsync_start *= p->vscan;
823 p->crtc_vsync_end *= p->vscan;
824 p->crtc_vtotal *= p->vscan;
825 }
826 }
827
828 if (adjust_flags & CRTC_STEREO_DOUBLE) {
829 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
830
831 switch (layout) {
832 case DRM_MODE_FLAG_3D_FRAME_PACKING:
833 p->crtc_clock *= 2;
834 p->crtc_vdisplay += p->crtc_vtotal;
835 p->crtc_vsync_start += p->crtc_vtotal;
836 p->crtc_vsync_end += p->crtc_vtotal;
837 p->crtc_vtotal += p->crtc_vtotal;
838 break;
839 }
840 }
841
842 p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
843 p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
844 p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
845 p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
846 }
847 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
848
849 /**
850 * drm_mode_copy - copy the mode
851 * @dst: mode to overwrite
852 * @src: mode to copy
853 *
854 * Copy an existing mode into another mode, preserving the object id and
855 * list head of the destination mode.
856 */
drm_mode_copy(struct drm_display_mode * dst,const struct drm_display_mode * src)857 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
858 {
859 int id = dst->base.id;
860 struct list_head head = dst->head;
861
862 *dst = *src;
863 dst->base.id = id;
864 dst->head = head;
865 }
866 EXPORT_SYMBOL(drm_mode_copy);
867
868 /**
869 * drm_mode_duplicate - allocate and duplicate an existing mode
870 * @dev: drm_device to allocate the duplicated mode for
871 * @mode: mode to duplicate
872 *
873 * Just allocate a new mode, copy the existing mode into it, and return
874 * a pointer to it. Used to create new instances of established modes.
875 *
876 * Returns:
877 * Pointer to duplicated mode on success, NULL on error.
878 */
drm_mode_duplicate(struct drm_device * dev,const struct drm_display_mode * mode)879 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
880 const struct drm_display_mode *mode)
881 {
882 struct drm_display_mode *nmode;
883
884 nmode = drm_mode_create(dev);
885 if (!nmode)
886 return NULL;
887
888 drm_mode_copy(nmode, mode);
889
890 return nmode;
891 }
892 EXPORT_SYMBOL(drm_mode_duplicate);
893
894 /**
895 * drm_mode_equal - test modes for equality
896 * @mode1: first mode
897 * @mode2: second mode
898 *
899 * Check to see if @mode1 and @mode2 are equivalent.
900 *
901 * Returns:
902 * True if the modes are equal, false otherwise.
903 */
drm_mode_equal(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)904 bool drm_mode_equal(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
905 {
906 if (!mode1 && !mode2)
907 return true;
908
909 if (!mode1 || !mode2)
910 return false;
911
912 /* do clock check convert to PICOS so fb modes get matched
913 * the same */
914 if (mode1->clock && mode2->clock) {
915 if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
916 return false;
917 } else if (mode1->clock != mode2->clock)
918 return false;
919
920 if ((mode1->flags & DRM_MODE_FLAG_3D_MASK) !=
921 (mode2->flags & DRM_MODE_FLAG_3D_MASK))
922 return false;
923
924 return drm_mode_equal_no_clocks_no_stereo(mode1, mode2);
925 }
926 EXPORT_SYMBOL(drm_mode_equal);
927
928 /**
929 * drm_mode_equal_no_clocks_no_stereo - test modes for equality
930 * @mode1: first mode
931 * @mode2: second mode
932 *
933 * Check to see if @mode1 and @mode2 are equivalent, but
934 * don't check the pixel clocks nor the stereo layout.
935 *
936 * Returns:
937 * True if the modes are equal, false otherwise.
938 */
drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode * mode1,const struct drm_display_mode * mode2)939 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
940 const struct drm_display_mode *mode2)
941 {
942 if (mode1->hdisplay == mode2->hdisplay &&
943 mode1->hsync_start == mode2->hsync_start &&
944 mode1->hsync_end == mode2->hsync_end &&
945 mode1->htotal == mode2->htotal &&
946 mode1->hskew == mode2->hskew &&
947 mode1->vdisplay == mode2->vdisplay &&
948 mode1->vsync_start == mode2->vsync_start &&
949 mode1->vsync_end == mode2->vsync_end &&
950 mode1->vtotal == mode2->vtotal &&
951 mode1->vscan == mode2->vscan &&
952 (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
953 (mode2->flags & ~DRM_MODE_FLAG_3D_MASK))
954 return true;
955
956 return false;
957 }
958 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
959
960 /**
961 * drm_mode_validate_basic - make sure the mode is somewhat sane
962 * @mode: mode to check
963 *
964 * Check that the mode timings are at least somewhat reasonable.
965 * Any hardware specific limits are left up for each driver to check.
966 *
967 * Returns:
968 * The mode status
969 */
970 enum drm_mode_status
drm_mode_validate_basic(const struct drm_display_mode * mode)971 drm_mode_validate_basic(const struct drm_display_mode *mode)
972 {
973 if (mode->clock == 0)
974 return MODE_CLOCK_LOW;
975
976 if (mode->hdisplay == 0 ||
977 mode->hsync_start < mode->hdisplay ||
978 mode->hsync_end < mode->hsync_start ||
979 mode->htotal < mode->hsync_end)
980 return MODE_H_ILLEGAL;
981
982 if (mode->vdisplay == 0 ||
983 mode->vsync_start < mode->vdisplay ||
984 mode->vsync_end < mode->vsync_start ||
985 mode->vtotal < mode->vsync_end)
986 return MODE_V_ILLEGAL;
987
988 return MODE_OK;
989 }
990 EXPORT_SYMBOL(drm_mode_validate_basic);
991
992 /**
993 * drm_mode_validate_size - make sure modes adhere to size constraints
994 * @mode: mode to check
995 * @maxX: maximum width
996 * @maxY: maximum height
997 *
998 * This function is a helper which can be used to validate modes against size
999 * limitations of the DRM device/connector. If a mode is too big its status
1000 * member is updated with the appropriate validation failure code. The list
1001 * itself is not changed.
1002 *
1003 * Returns:
1004 * The mode status
1005 */
1006 enum drm_mode_status
drm_mode_validate_size(const struct drm_display_mode * mode,int maxX,int maxY)1007 drm_mode_validate_size(const struct drm_display_mode *mode,
1008 int maxX, int maxY)
1009 {
1010 if (maxX > 0 && mode->hdisplay > maxX)
1011 return MODE_VIRTUAL_X;
1012
1013 if (maxY > 0 && mode->vdisplay > maxY)
1014 return MODE_VIRTUAL_Y;
1015
1016 return MODE_OK;
1017 }
1018 EXPORT_SYMBOL(drm_mode_validate_size);
1019
1020 #define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1021
1022 static const char * const drm_mode_status_names[] = {
1023 MODE_STATUS(OK),
1024 MODE_STATUS(HSYNC),
1025 MODE_STATUS(VSYNC),
1026 MODE_STATUS(H_ILLEGAL),
1027 MODE_STATUS(V_ILLEGAL),
1028 MODE_STATUS(BAD_WIDTH),
1029 MODE_STATUS(NOMODE),
1030 MODE_STATUS(NO_INTERLACE),
1031 MODE_STATUS(NO_DBLESCAN),
1032 MODE_STATUS(NO_VSCAN),
1033 MODE_STATUS(MEM),
1034 MODE_STATUS(VIRTUAL_X),
1035 MODE_STATUS(VIRTUAL_Y),
1036 MODE_STATUS(MEM_VIRT),
1037 MODE_STATUS(NOCLOCK),
1038 MODE_STATUS(CLOCK_HIGH),
1039 MODE_STATUS(CLOCK_LOW),
1040 MODE_STATUS(CLOCK_RANGE),
1041 MODE_STATUS(BAD_HVALUE),
1042 MODE_STATUS(BAD_VVALUE),
1043 MODE_STATUS(BAD_VSCAN),
1044 MODE_STATUS(HSYNC_NARROW),
1045 MODE_STATUS(HSYNC_WIDE),
1046 MODE_STATUS(HBLANK_NARROW),
1047 MODE_STATUS(HBLANK_WIDE),
1048 MODE_STATUS(VSYNC_NARROW),
1049 MODE_STATUS(VSYNC_WIDE),
1050 MODE_STATUS(VBLANK_NARROW),
1051 MODE_STATUS(VBLANK_WIDE),
1052 MODE_STATUS(PANEL),
1053 MODE_STATUS(INTERLACE_WIDTH),
1054 MODE_STATUS(ONE_WIDTH),
1055 MODE_STATUS(ONE_HEIGHT),
1056 MODE_STATUS(ONE_SIZE),
1057 MODE_STATUS(NO_REDUCED),
1058 MODE_STATUS(NO_STEREO),
1059 MODE_STATUS(UNVERIFIED),
1060 MODE_STATUS(BAD),
1061 MODE_STATUS(ERROR),
1062 };
1063
1064 #undef MODE_STATUS
1065
drm_get_mode_status_name(enum drm_mode_status status)1066 static const char *drm_get_mode_status_name(enum drm_mode_status status)
1067 {
1068 int index = status + 3;
1069
1070 if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1071 return "";
1072
1073 return drm_mode_status_names[index];
1074 }
1075
1076 /**
1077 * drm_mode_prune_invalid - remove invalid modes from mode list
1078 * @dev: DRM device
1079 * @mode_list: list of modes to check
1080 * @verbose: be verbose about it
1081 *
1082 * This helper function can be used to prune a display mode list after
1083 * validation has been completed. All modes who's status is not MODE_OK will be
1084 * removed from the list, and if @verbose the status code and mode name is also
1085 * printed to dmesg.
1086 */
drm_mode_prune_invalid(struct drm_device * dev,struct list_head * mode_list,bool verbose)1087 void drm_mode_prune_invalid(struct drm_device *dev,
1088 struct list_head *mode_list, bool verbose)
1089 {
1090 struct drm_display_mode *mode, *t;
1091
1092 list_for_each_entry_safe(mode, t, mode_list, head) {
1093 if (mode->status != MODE_OK) {
1094 list_del(&mode->head);
1095 if (verbose) {
1096 drm_mode_debug_printmodeline(mode);
1097 DRM_DEBUG_KMS("Not using %s mode: %s\n",
1098 mode->name,
1099 drm_get_mode_status_name(mode->status));
1100 }
1101 drm_mode_destroy(dev, mode);
1102 }
1103 }
1104 }
1105 EXPORT_SYMBOL(drm_mode_prune_invalid);
1106
1107 /**
1108 * drm_mode_compare - compare modes for favorability
1109 * @priv: unused
1110 * @lh_a: list_head for first mode
1111 * @lh_b: list_head for second mode
1112 *
1113 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1114 * which is better.
1115 *
1116 * Returns:
1117 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1118 * positive if @lh_b is better than @lh_a.
1119 */
drm_mode_compare(void * priv,struct list_head * lh_a,struct list_head * lh_b)1120 static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
1121 {
1122 struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1123 struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1124 int diff;
1125
1126 diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1127 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1128 if (diff)
1129 return diff;
1130 diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1131 if (diff)
1132 return diff;
1133
1134 diff = b->vrefresh - a->vrefresh;
1135 if (diff)
1136 return diff;
1137
1138 diff = b->clock - a->clock;
1139 return diff;
1140 }
1141
1142 /**
1143 * drm_mode_sort - sort mode list
1144 * @mode_list: list of drm_display_mode structures to sort
1145 *
1146 * Sort @mode_list by favorability, moving good modes to the head of the list.
1147 */
drm_mode_sort(struct list_head * mode_list)1148 void drm_mode_sort(struct list_head *mode_list)
1149 {
1150 list_sort(NULL, mode_list, drm_mode_compare);
1151 }
1152 EXPORT_SYMBOL(drm_mode_sort);
1153
1154 /**
1155 * drm_mode_connector_list_update - update the mode list for the connector
1156 * @connector: the connector to update
1157 * @merge_type_bits: whether to merge or overwrite type bits
1158 *
1159 * This moves the modes from the @connector probed_modes list
1160 * to the actual mode list. It compares the probed mode against the current
1161 * list and only adds different/new modes.
1162 *
1163 * This is just a helper functions doesn't validate any modes itself and also
1164 * doesn't prune any invalid modes. Callers need to do that themselves.
1165 */
drm_mode_connector_list_update(struct drm_connector * connector,bool merge_type_bits)1166 void drm_mode_connector_list_update(struct drm_connector *connector,
1167 bool merge_type_bits)
1168 {
1169 struct drm_display_mode *mode;
1170 struct drm_display_mode *pmode, *pt;
1171 int found_it;
1172
1173 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1174
1175 list_for_each_entry_safe(pmode, pt, &connector->probed_modes,
1176 head) {
1177 found_it = 0;
1178 /* go through current modes checking for the new probed mode */
1179 list_for_each_entry(mode, &connector->modes, head) {
1180 if (drm_mode_equal(pmode, mode)) {
1181 found_it = 1;
1182 /* if equal delete the probed mode */
1183 mode->status = pmode->status;
1184 /* Merge type bits together */
1185 if (merge_type_bits)
1186 mode->type |= pmode->type;
1187 else
1188 mode->type = pmode->type;
1189 list_del(&pmode->head);
1190 drm_mode_destroy(connector->dev, pmode);
1191 break;
1192 }
1193 }
1194
1195 if (!found_it) {
1196 list_move_tail(&pmode->head, &connector->modes);
1197 }
1198 }
1199 }
1200 EXPORT_SYMBOL(drm_mode_connector_list_update);
1201
1202 /**
1203 * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
1204 * @mode_option: optional per connector mode option
1205 * @connector: connector to parse modeline for
1206 * @mode: preallocated drm_cmdline_mode structure to fill out
1207 *
1208 * This parses @mode_option command line modeline for modes and options to
1209 * configure the connector. If @mode_option is NULL the default command line
1210 * modeline in fb_mode_option will be parsed instead.
1211 *
1212 * This uses the same parameters as the fb modedb.c, except for an extra
1213 * force-enable, force-enable-digital and force-disable bit at the end:
1214 *
1215 * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1216 *
1217 * The intermediate drm_cmdline_mode structure is required to store additional
1218 * options from the command line modline like the force-enable/disable flag.
1219 *
1220 * Returns:
1221 * True if a valid modeline has been parsed, false otherwise.
1222 */
drm_mode_parse_command_line_for_connector(const char * mode_option,struct drm_connector * connector,struct drm_cmdline_mode * mode)1223 bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1224 struct drm_connector *connector,
1225 struct drm_cmdline_mode *mode)
1226 {
1227 const char *name;
1228 unsigned int namelen;
1229 bool res_specified = false, bpp_specified = false, refresh_specified = false;
1230 unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
1231 bool yres_specified = false, cvt = false, rb = false;
1232 bool interlace = false, margins = false, was_digit = false;
1233 int i;
1234 enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
1235
1236 #ifdef CONFIG_FB
1237 if (!mode_option)
1238 mode_option = fb_mode_option;
1239 #endif
1240
1241 if (!mode_option) {
1242 mode->specified = false;
1243 return false;
1244 }
1245
1246 name = mode_option;
1247 namelen = strlen(name);
1248 for (i = namelen-1; i >= 0; i--) {
1249 switch (name[i]) {
1250 case '@':
1251 if (!refresh_specified && !bpp_specified &&
1252 !yres_specified && !cvt && !rb && was_digit) {
1253 refresh = simple_strtol(&name[i+1], NULL, 10);
1254 refresh_specified = true;
1255 was_digit = false;
1256 } else
1257 goto done;
1258 break;
1259 case '-':
1260 if (!bpp_specified && !yres_specified && !cvt &&
1261 !rb && was_digit) {
1262 bpp = simple_strtol(&name[i+1], NULL, 10);
1263 bpp_specified = true;
1264 was_digit = false;
1265 } else
1266 goto done;
1267 break;
1268 case 'x':
1269 if (!yres_specified && was_digit) {
1270 yres = simple_strtol(&name[i+1], NULL, 10);
1271 yres_specified = true;
1272 was_digit = false;
1273 } else
1274 goto done;
1275 break;
1276 case '0' ... '9':
1277 was_digit = true;
1278 break;
1279 case 'M':
1280 if (yres_specified || cvt || was_digit)
1281 goto done;
1282 cvt = true;
1283 break;
1284 case 'R':
1285 if (yres_specified || cvt || rb || was_digit)
1286 goto done;
1287 rb = true;
1288 break;
1289 case 'm':
1290 if (cvt || yres_specified || was_digit)
1291 goto done;
1292 margins = true;
1293 break;
1294 case 'i':
1295 if (cvt || yres_specified || was_digit)
1296 goto done;
1297 interlace = true;
1298 break;
1299 case 'e':
1300 if (yres_specified || bpp_specified || refresh_specified ||
1301 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1302 goto done;
1303
1304 force = DRM_FORCE_ON;
1305 break;
1306 case 'D':
1307 if (yres_specified || bpp_specified || refresh_specified ||
1308 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1309 goto done;
1310
1311 if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1312 (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1313 force = DRM_FORCE_ON;
1314 else
1315 force = DRM_FORCE_ON_DIGITAL;
1316 break;
1317 case 'd':
1318 if (yres_specified || bpp_specified || refresh_specified ||
1319 was_digit || (force != DRM_FORCE_UNSPECIFIED))
1320 goto done;
1321
1322 force = DRM_FORCE_OFF;
1323 break;
1324 default:
1325 goto done;
1326 }
1327 }
1328
1329 if (i < 0 && yres_specified) {
1330 char *ch;
1331 xres = simple_strtol(name, &ch, 10);
1332 if ((ch != NULL) && (*ch == 'x'))
1333 res_specified = true;
1334 else
1335 i = ch - name;
1336 } else if (!yres_specified && was_digit) {
1337 /* catch mode that begins with digits but has no 'x' */
1338 i = 0;
1339 }
1340 done:
1341 if (i >= 0) {
1342 printk(KERN_WARNING
1343 "parse error at position %i in video mode '%s'\n",
1344 i, name);
1345 mode->specified = false;
1346 return false;
1347 }
1348
1349 if (res_specified) {
1350 mode->specified = true;
1351 mode->xres = xres;
1352 mode->yres = yres;
1353 }
1354
1355 if (refresh_specified) {
1356 mode->refresh_specified = true;
1357 mode->refresh = refresh;
1358 }
1359
1360 if (bpp_specified) {
1361 mode->bpp_specified = true;
1362 mode->bpp = bpp;
1363 }
1364 mode->rb = rb;
1365 mode->cvt = cvt;
1366 mode->interlace = interlace;
1367 mode->margins = margins;
1368 mode->force = force;
1369
1370 return true;
1371 }
1372 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1373
1374 /**
1375 * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
1376 * @dev: DRM device to create the new mode for
1377 * @cmd: input command line modeline
1378 *
1379 * Returns:
1380 * Pointer to converted mode on success, NULL on error.
1381 */
1382 struct drm_display_mode *
drm_mode_create_from_cmdline_mode(struct drm_device * dev,struct drm_cmdline_mode * cmd)1383 drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1384 struct drm_cmdline_mode *cmd)
1385 {
1386 struct drm_display_mode *mode;
1387
1388 if (cmd->cvt)
1389 mode = drm_cvt_mode(dev,
1390 cmd->xres, cmd->yres,
1391 cmd->refresh_specified ? cmd->refresh : 60,
1392 cmd->rb, cmd->interlace,
1393 cmd->margins);
1394 else
1395 mode = drm_gtf_mode(dev,
1396 cmd->xres, cmd->yres,
1397 cmd->refresh_specified ? cmd->refresh : 60,
1398 cmd->interlace,
1399 cmd->margins);
1400 if (!mode)
1401 return NULL;
1402
1403 mode->type |= DRM_MODE_TYPE_USERDEF;
1404 /* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
1405 if (cmd->xres == 1366 && mode->hdisplay == 1368) {
1406 mode->hdisplay = 1366;
1407 mode->hsync_start--;
1408 mode->hsync_end--;
1409 drm_mode_set_name(mode);
1410 }
1411 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1412 return mode;
1413 }
1414 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
1415
1416 /**
1417 * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo
1418 * @out: drm_mode_modeinfo struct to return to the user
1419 * @in: drm_display_mode to use
1420 *
1421 * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
1422 * the user.
1423 */
drm_mode_convert_to_umode(struct drm_mode_modeinfo * out,const struct drm_display_mode * in)1424 void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
1425 const struct drm_display_mode *in)
1426 {
1427 WARN(in->hdisplay > USHRT_MAX || in->hsync_start > USHRT_MAX ||
1428 in->hsync_end > USHRT_MAX || in->htotal > USHRT_MAX ||
1429 in->hskew > USHRT_MAX || in->vdisplay > USHRT_MAX ||
1430 in->vsync_start > USHRT_MAX || in->vsync_end > USHRT_MAX ||
1431 in->vtotal > USHRT_MAX || in->vscan > USHRT_MAX,
1432 "timing values too large for mode info\n");
1433
1434 out->clock = in->clock;
1435 out->hdisplay = in->hdisplay;
1436 out->hsync_start = in->hsync_start;
1437 out->hsync_end = in->hsync_end;
1438 out->htotal = in->htotal;
1439 out->hskew = in->hskew;
1440 out->vdisplay = in->vdisplay;
1441 out->vsync_start = in->vsync_start;
1442 out->vsync_end = in->vsync_end;
1443 out->vtotal = in->vtotal;
1444 out->vscan = in->vscan;
1445 out->vrefresh = in->vrefresh;
1446 out->flags = in->flags;
1447 out->type = in->type;
1448 strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1449 out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1450 }
1451
1452 /**
1453 * drm_crtc_convert_umode - convert a modeinfo into a drm_display_mode
1454 * @out: drm_display_mode to return to the user
1455 * @in: drm_mode_modeinfo to use
1456 *
1457 * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
1458 * the caller.
1459 *
1460 * Returns:
1461 * Zero on success, negative errno on failure.
1462 */
drm_mode_convert_umode(struct drm_display_mode * out,const struct drm_mode_modeinfo * in)1463 int drm_mode_convert_umode(struct drm_display_mode *out,
1464 const struct drm_mode_modeinfo *in)
1465 {
1466 int ret = -EINVAL;
1467
1468 if (in->clock > INT_MAX || in->vrefresh > INT_MAX) {
1469 ret = -ERANGE;
1470 goto out;
1471 }
1472
1473 if ((in->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1474 goto out;
1475
1476 out->clock = in->clock;
1477 out->hdisplay = in->hdisplay;
1478 out->hsync_start = in->hsync_start;
1479 out->hsync_end = in->hsync_end;
1480 out->htotal = in->htotal;
1481 out->hskew = in->hskew;
1482 out->vdisplay = in->vdisplay;
1483 out->vsync_start = in->vsync_start;
1484 out->vsync_end = in->vsync_end;
1485 out->vtotal = in->vtotal;
1486 out->vscan = in->vscan;
1487 out->vrefresh = in->vrefresh;
1488 out->flags = in->flags;
1489 out->type = in->type;
1490 strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1491 out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1492
1493 out->status = drm_mode_validate_basic(out);
1494 if (out->status != MODE_OK)
1495 goto out;
1496
1497 drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
1498
1499 ret = 0;
1500
1501 out:
1502 return ret;
1503 }