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
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:
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
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.
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).
33 #include <linux/list.h>
34 #include <linux/list_sort.h>
35 #include <linux/export.h>
37 #include <drm/drm_crtc.h>
38 #include <video/of_videomode.h>
39 #include <video/videomode.h>
40 #include <drm/drm_modes.h>
42 #include "drm_crtc_internal.h"
45 * drm_mode_debug_printmodeline - print a mode to dmesg
46 * @mode: mode to print
48 * Describe @mode using DRM_DEBUG.
50 void drm_mode_debug_printmodeline(const struct drm_display_mode
*mode
)
52 DRM_DEBUG_KMS("Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d "
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
);
60 EXPORT_SYMBOL(drm_mode_debug_printmodeline
);
63 * drm_mode_create - create a new display mode
66 * Create a new drm_display_mode, give it an ID, and return it.
69 * Pointer to new mode on success, NULL on error.
71 struct drm_display_mode
*drm_mode_create(struct drm_device
*dev
)
73 struct drm_display_mode
*nmode
;
75 nmode
= kzalloc(sizeof(struct drm_display_mode
), GFP_KERNEL
);
79 if (drm_mode_object_get(dev
, &nmode
->base
, DRM_MODE_OBJECT_MODE
)) {
86 EXPORT_SYMBOL(drm_mode_create
);
89 * drm_mode_destroy - remove a mode
91 * @mode: mode to remove
93 * Free @mode's unique identifier, then free it.
95 void drm_mode_destroy(struct drm_device
*dev
, struct drm_display_mode
*mode
)
100 drm_mode_object_put(dev
, &mode
->base
);
104 EXPORT_SYMBOL(drm_mode_destroy
);
107 * drm_mode_probed_add - add a mode to a connector's probed mode list
108 * @connector: connector the new mode
111 * Add @mode to @connector's mode list for later use.
113 void drm_mode_probed_add(struct drm_connector
*connector
,
114 struct drm_display_mode
*mode
)
116 WARN_ON(!mutex_is_locked(&connector
->dev
->mode_config
.mutex
));
118 list_add_tail(&mode
->head
, &connector
->probed_modes
);
120 EXPORT_SYMBOL(drm_mode_probed_add
);
123 * drm_cvt_mode -create a modeline based on CVT algorithm
125 * @hdisplay: hdisplay size
126 * @vdisplay: vdisplay size
127 * @vrefresh : vrefresh rate
128 * @reduced : Whether the GTF calculation is simplified
129 * @interlaced:Whether the interlace is supported
130 * @margins: whether to add margins or not
132 * return the modeline based on CVT algorithm
134 * This function is called to generate the modeline based on CVT algorithm
135 * according to the hdisplay, vdisplay, vrefresh.
136 * It is based from the VESA(TM) Coordinated Video Timing Generator by
137 * Graham Loveridge April 9, 2003 available at
138 * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
140 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
141 * What I have done is to translate it by using integer calculation.
143 struct drm_display_mode
*drm_cvt_mode(struct drm_device
*dev
, int hdisplay
,
144 int vdisplay
, int vrefresh
,
145 bool reduced
, bool interlaced
, bool margins
)
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
;
163 /* allocate the drm_display_mode structure. If failure, we will
166 drm_mode
= drm_mode_create(dev
);
170 /* the CVT default refresh rate is 60Hz */
174 /* the required field fresh rate */
176 vfieldrate
= vrefresh
* 2;
178 vfieldrate
= vrefresh
;
180 /* horizontal pixels */
181 hdisplay_rnd
= hdisplay
- (hdisplay
% CVT_H_GRANULARITY
);
183 /* determine the left&right borders */
186 hmargin
= hdisplay_rnd
* CVT_MARGIN_PERCENTAGE
/ 1000;
187 hmargin
-= hmargin
% CVT_H_GRANULARITY
;
189 /* find the total active pixels */
190 drm_mode
->hdisplay
= hdisplay_rnd
+ 2 * hmargin
;
192 /* find the number of lines per field */
194 vdisplay_rnd
= vdisplay
/ 2;
196 vdisplay_rnd
= vdisplay
;
198 /* find the top & bottom borders */
201 vmargin
= vdisplay_rnd
* CVT_MARGIN_PERCENTAGE
/ 1000;
203 drm_mode
->vdisplay
= vdisplay
+ 2 * vmargin
;
211 /* Determine VSync Width from aspect ratio */
212 if (!(vdisplay
% 3) && ((vdisplay
* 4 / 3) == hdisplay
))
214 else if (!(vdisplay
% 9) && ((vdisplay
* 16 / 9) == hdisplay
))
216 else if (!(vdisplay
% 10) && ((vdisplay
* 16 / 10) == hdisplay
))
218 else if (!(vdisplay
% 4) && ((vdisplay
* 5 / 4) == hdisplay
))
220 else if (!(vdisplay
% 9) && ((vdisplay
* 15 / 9) == hdisplay
))
226 /* simplify the GTF calculation */
227 /* 4) Minimum time of vertical sync + back porch interval (µs)
231 #define CVT_MIN_VSYNC_BP 550
232 /* 3) Nominal HSync width (% of line period) - default 8 */
233 #define CVT_HSYNC_PERCENTAGE 8
234 unsigned int hblank_percentage
;
235 int vsyncandback_porch
, vback_porch
, hblank
;
237 /* estimated the horizontal period */
238 tmp1
= HV_FACTOR
* 1000000 -
239 CVT_MIN_VSYNC_BP
* HV_FACTOR
* vfieldrate
;
240 tmp2
= (vdisplay_rnd
+ 2 * vmargin
+ CVT_MIN_V_PORCH
) * 2 +
242 hperiod
= tmp1
* 2 / (tmp2
* vfieldrate
);
244 tmp1
= CVT_MIN_VSYNC_BP
* HV_FACTOR
/ hperiod
+ 1;
245 /* 9. Find number of lines in sync + backporch */
246 if (tmp1
< (vsync
+ CVT_MIN_V_PORCH
))
247 vsyncandback_porch
= vsync
+ CVT_MIN_V_PORCH
;
249 vsyncandback_porch
= tmp1
;
250 /* 10. Find number of lines in back porch */
251 vback_porch
= vsyncandback_porch
- vsync
;
252 drm_mode
->vtotal
= vdisplay_rnd
+ 2 * vmargin
+
253 vsyncandback_porch
+ CVT_MIN_V_PORCH
;
254 /* 5) Definition of Horizontal blanking time limitation */
255 /* Gradient (%/kHz) - default 600 */
256 #define CVT_M_FACTOR 600
257 /* Offset (%) - default 40 */
258 #define CVT_C_FACTOR 40
259 /* Blanking time scaling factor - default 128 */
260 #define CVT_K_FACTOR 128
261 /* Scaling factor weighting - default 20 */
262 #define CVT_J_FACTOR 20
263 #define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256)
264 #define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
266 /* 12. Find ideal blanking duty cycle from formula */
267 hblank_percentage
= CVT_C_PRIME
* HV_FACTOR
- CVT_M_PRIME
*
269 /* 13. Blanking time */
270 if (hblank_percentage
< 20 * HV_FACTOR
)
271 hblank_percentage
= 20 * HV_FACTOR
;
272 hblank
= drm_mode
->hdisplay
* hblank_percentage
/
273 (100 * HV_FACTOR
- hblank_percentage
);
274 hblank
-= hblank
% (2 * CVT_H_GRANULARITY
);
275 /* 14. find the total pixes per line */
276 drm_mode
->htotal
= drm_mode
->hdisplay
+ hblank
;
277 drm_mode
->hsync_end
= drm_mode
->hdisplay
+ hblank
/ 2;
278 drm_mode
->hsync_start
= drm_mode
->hsync_end
-
279 (drm_mode
->htotal
* CVT_HSYNC_PERCENTAGE
) / 100;
280 drm_mode
->hsync_start
+= CVT_H_GRANULARITY
-
281 drm_mode
->hsync_start
% CVT_H_GRANULARITY
;
282 /* fill the Vsync values */
283 drm_mode
->vsync_start
= drm_mode
->vdisplay
+ CVT_MIN_V_PORCH
;
284 drm_mode
->vsync_end
= drm_mode
->vsync_start
+ vsync
;
286 /* Reduced blanking */
287 /* Minimum vertical blanking interval time (µs)- default 460 */
288 #define CVT_RB_MIN_VBLANK 460
289 /* Fixed number of clocks for horizontal sync */
290 #define CVT_RB_H_SYNC 32
291 /* Fixed number of clocks for horizontal blanking */
292 #define CVT_RB_H_BLANK 160
293 /* Fixed number of lines for vertical front porch - default 3*/
294 #define CVT_RB_VFPORCH 3
297 /* 8. Estimate Horizontal period. */
298 tmp1
= HV_FACTOR
* 1000000 -
299 CVT_RB_MIN_VBLANK
* HV_FACTOR
* vfieldrate
;
300 tmp2
= vdisplay_rnd
+ 2 * vmargin
;
301 hperiod
= tmp1
/ (tmp2
* vfieldrate
);
302 /* 9. Find number of lines in vertical blanking */
303 vbilines
= CVT_RB_MIN_VBLANK
* HV_FACTOR
/ hperiod
+ 1;
304 /* 10. Check if vertical blanking is sufficient */
305 if (vbilines
< (CVT_RB_VFPORCH
+ vsync
+ CVT_MIN_V_BPORCH
))
306 vbilines
= CVT_RB_VFPORCH
+ vsync
+ CVT_MIN_V_BPORCH
;
307 /* 11. Find total number of lines in vertical field */
308 drm_mode
->vtotal
= vdisplay_rnd
+ 2 * vmargin
+ vbilines
;
309 /* 12. Find total number of pixels in a line */
310 drm_mode
->htotal
= drm_mode
->hdisplay
+ CVT_RB_H_BLANK
;
311 /* Fill in HSync values */
312 drm_mode
->hsync_end
= drm_mode
->hdisplay
+ CVT_RB_H_BLANK
/ 2;
313 drm_mode
->hsync_start
= drm_mode
->hsync_end
- CVT_RB_H_SYNC
;
314 /* Fill in VSync values */
315 drm_mode
->vsync_start
= drm_mode
->vdisplay
+ CVT_RB_VFPORCH
;
316 drm_mode
->vsync_end
= drm_mode
->vsync_start
+ vsync
;
318 /* 15/13. Find pixel clock frequency (kHz for xf86) */
319 drm_mode
->clock
= drm_mode
->htotal
* HV_FACTOR
* 1000 / hperiod
;
320 drm_mode
->clock
-= drm_mode
->clock
% CVT_CLOCK_STEP
;
321 /* 18/16. Find actual vertical frame frequency */
322 /* ignore - just set the mode flag for interlaced */
324 drm_mode
->vtotal
*= 2;
325 drm_mode
->flags
|= DRM_MODE_FLAG_INTERLACE
;
327 /* Fill the mode line name */
328 drm_mode_set_name(drm_mode
);
330 drm_mode
->flags
|= (DRM_MODE_FLAG_PHSYNC
|
331 DRM_MODE_FLAG_NVSYNC
);
333 drm_mode
->flags
|= (DRM_MODE_FLAG_PVSYNC
|
334 DRM_MODE_FLAG_NHSYNC
);
338 EXPORT_SYMBOL(drm_cvt_mode
);
341 * drm_gtf_mode_complex - create the modeline based on full GTF algorithm
344 * @hdisplay :hdisplay size
345 * @vdisplay :vdisplay size
346 * @vrefresh :vrefresh rate.
347 * @interlaced :whether the interlace is supported
348 * @margins :desired margin size
349 * @GTF_M: extended GTF formula parameters
350 * @GTF_2C: extended GTF formula parameters
351 * @GTF_K: extended GTF formula parameters
352 * @GTF_2J: extended GTF formula parameters
354 * return the modeline based on full GTF algorithm.
356 * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
357 * in here multiplied by two. For a C of 40, pass in 80.
359 struct drm_display_mode
*
360 drm_gtf_mode_complex(struct drm_device
*dev
, int hdisplay
, int vdisplay
,
361 int vrefresh
, bool interlaced
, int margins
,
362 int GTF_M
, int GTF_2C
, int GTF_K
, int GTF_2J
)
363 { /* 1) top/bottom margin size (% of height) - default: 1.8, */
364 #define GTF_MARGIN_PERCENTAGE 18
365 /* 2) character cell horizontal granularity (pixels) - default 8 */
366 #define GTF_CELL_GRAN 8
367 /* 3) Minimum vertical porch (lines) - default 3 */
368 #define GTF_MIN_V_PORCH 1
369 /* width of vsync in lines */
371 /* width of hsync as % of total line */
372 #define H_SYNC_PERCENT 8
373 /* min time of vsync + back porch (microsec) */
374 #define MIN_VSYNC_PLUS_BP 550
375 /* C' and M' are part of the Blanking Duty Cycle computation */
376 #define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
377 #define GTF_M_PRIME (GTF_K * GTF_M / 256)
378 struct drm_display_mode
*drm_mode
;
379 unsigned int hdisplay_rnd
, vdisplay_rnd
, vfieldrate_rqd
;
380 int top_margin
, bottom_margin
;
382 unsigned int hfreq_est
;
383 int vsync_plus_bp
, vback_porch
;
384 unsigned int vtotal_lines
, vfieldrate_est
, hperiod
;
385 unsigned int vfield_rate
, vframe_rate
;
386 int left_margin
, right_margin
;
387 unsigned int total_active_pixels
, ideal_duty_cycle
;
388 unsigned int hblank
, total_pixels
, pixel_freq
;
389 int hsync
, hfront_porch
, vodd_front_porch_lines
;
390 unsigned int tmp1
, tmp2
;
392 drm_mode
= drm_mode_create(dev
);
396 /* 1. In order to give correct results, the number of horizontal
397 * pixels requested is first processed to ensure that it is divisible
398 * by the character size, by rounding it to the nearest character
401 hdisplay_rnd
= (hdisplay
+ GTF_CELL_GRAN
/ 2) / GTF_CELL_GRAN
;
402 hdisplay_rnd
= hdisplay_rnd
* GTF_CELL_GRAN
;
404 /* 2. If interlace is requested, the number of vertical lines assumed
405 * by the calculation must be halved, as the computation calculates
406 * the number of vertical lines per field.
409 vdisplay_rnd
= vdisplay
/ 2;
411 vdisplay_rnd
= vdisplay
;
413 /* 3. Find the frame rate required: */
415 vfieldrate_rqd
= vrefresh
* 2;
417 vfieldrate_rqd
= vrefresh
;
419 /* 4. Find number of lines in Top margin: */
422 top_margin
= (vdisplay_rnd
* GTF_MARGIN_PERCENTAGE
+ 500) /
424 /* 5. Find number of lines in bottom margin: */
425 bottom_margin
= top_margin
;
427 /* 6. If interlace is required, then set variable interlace: */
433 /* 7. Estimate the Horizontal frequency */
435 tmp1
= (1000000 - MIN_VSYNC_PLUS_BP
* vfieldrate_rqd
) / 500;
436 tmp2
= (vdisplay_rnd
+ 2 * top_margin
+ GTF_MIN_V_PORCH
) *
438 hfreq_est
= (tmp2
* 1000 * vfieldrate_rqd
) / tmp1
;
441 /* 8. Find the number of lines in V sync + back porch */
442 /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
443 vsync_plus_bp
= MIN_VSYNC_PLUS_BP
* hfreq_est
/ 1000;
444 vsync_plus_bp
= (vsync_plus_bp
+ 500) / 1000;
445 /* 9. Find the number of lines in V back porch alone: */
446 vback_porch
= vsync_plus_bp
- V_SYNC_RQD
;
447 /* 10. Find the total number of lines in Vertical field period: */
448 vtotal_lines
= vdisplay_rnd
+ top_margin
+ bottom_margin
+
449 vsync_plus_bp
+ GTF_MIN_V_PORCH
;
450 /* 11. Estimate the Vertical field frequency: */
451 vfieldrate_est
= hfreq_est
/ vtotal_lines
;
452 /* 12. Find the actual horizontal period: */
453 hperiod
= 1000000 / (vfieldrate_rqd
* vtotal_lines
);
455 /* 13. Find the actual Vertical field frequency: */
456 vfield_rate
= hfreq_est
/ vtotal_lines
;
457 /* 14. Find the Vertical frame frequency: */
459 vframe_rate
= vfield_rate
/ 2;
461 vframe_rate
= vfield_rate
;
462 /* 15. Find number of pixels in left margin: */
464 left_margin
= (hdisplay_rnd
* GTF_MARGIN_PERCENTAGE
+ 500) /
469 /* 16.Find number of pixels in right margin: */
470 right_margin
= left_margin
;
471 /* 17.Find total number of active pixels in image and left and right */
472 total_active_pixels
= hdisplay_rnd
+ left_margin
+ right_margin
;
473 /* 18.Find the ideal blanking duty cycle from blanking duty cycle */
474 ideal_duty_cycle
= GTF_C_PRIME
* 1000 -
475 (GTF_M_PRIME
* 1000000 / hfreq_est
);
476 /* 19.Find the number of pixels in the blanking time to the nearest
477 * double character cell: */
478 hblank
= total_active_pixels
* ideal_duty_cycle
/
479 (100000 - ideal_duty_cycle
);
480 hblank
= (hblank
+ GTF_CELL_GRAN
) / (2 * GTF_CELL_GRAN
);
481 hblank
= hblank
* 2 * GTF_CELL_GRAN
;
482 /* 20.Find total number of pixels: */
483 total_pixels
= total_active_pixels
+ hblank
;
484 /* 21.Find pixel clock frequency: */
485 pixel_freq
= total_pixels
* hfreq_est
/ 1000;
486 /* Stage 1 computations are now complete; I should really pass
487 * the results to another function and do the Stage 2 computations,
488 * but I only need a few more values so I'll just append the
489 * computations here for now */
490 /* 17. Find the number of pixels in the horizontal sync period: */
491 hsync
= H_SYNC_PERCENT
* total_pixels
/ 100;
492 hsync
= (hsync
+ GTF_CELL_GRAN
/ 2) / GTF_CELL_GRAN
;
493 hsync
= hsync
* GTF_CELL_GRAN
;
494 /* 18. Find the number of pixels in horizontal front porch period */
495 hfront_porch
= hblank
/ 2 - hsync
;
496 /* 36. Find the number of lines in the odd front porch period: */
497 vodd_front_porch_lines
= GTF_MIN_V_PORCH
;
499 /* finally, pack the results in the mode struct */
500 drm_mode
->hdisplay
= hdisplay_rnd
;
501 drm_mode
->hsync_start
= hdisplay_rnd
+ hfront_porch
;
502 drm_mode
->hsync_end
= drm_mode
->hsync_start
+ hsync
;
503 drm_mode
->htotal
= total_pixels
;
504 drm_mode
->vdisplay
= vdisplay_rnd
;
505 drm_mode
->vsync_start
= vdisplay_rnd
+ vodd_front_porch_lines
;
506 drm_mode
->vsync_end
= drm_mode
->vsync_start
+ V_SYNC_RQD
;
507 drm_mode
->vtotal
= vtotal_lines
;
509 drm_mode
->clock
= pixel_freq
;
512 drm_mode
->vtotal
*= 2;
513 drm_mode
->flags
|= DRM_MODE_FLAG_INTERLACE
;
516 drm_mode_set_name(drm_mode
);
517 if (GTF_M
== 600 && GTF_2C
== 80 && GTF_K
== 128 && GTF_2J
== 40)
518 drm_mode
->flags
= DRM_MODE_FLAG_NHSYNC
| DRM_MODE_FLAG_PVSYNC
;
520 drm_mode
->flags
= DRM_MODE_FLAG_PHSYNC
| DRM_MODE_FLAG_NVSYNC
;
524 EXPORT_SYMBOL(drm_gtf_mode_complex
);
527 * drm_gtf_mode - create the modeline based on GTF algorithm
530 * @hdisplay :hdisplay size
531 * @vdisplay :vdisplay size
532 * @vrefresh :vrefresh rate.
533 * @interlaced :whether the interlace is supported
534 * @margins :whether the margin is supported
536 * return the modeline based on GTF algorithm
538 * This function is to create the modeline based on the GTF algorithm.
539 * Generalized Timing Formula is derived from:
540 * GTF Spreadsheet by Andy Morrish (1/5/97)
541 * available at http://www.vesa.org
543 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
544 * What I have done is to translate it by using integer calculation.
545 * I also refer to the function of fb_get_mode in the file of
546 * drivers/video/fbmon.c
548 * Standard GTF parameters:
554 struct drm_display_mode
*
555 drm_gtf_mode(struct drm_device
*dev
, int hdisplay
, int vdisplay
, int vrefresh
,
556 bool interlaced
, int margins
)
558 return drm_gtf_mode_complex(dev
, hdisplay
, vdisplay
, vrefresh
,
560 600, 40 * 2, 128, 20 * 2);
562 EXPORT_SYMBOL(drm_gtf_mode
);
564 #ifdef CONFIG_VIDEOMODE_HELPERS
565 int drm_display_mode_from_videomode(const struct videomode
*vm
,
566 struct drm_display_mode
*dmode
)
568 dmode
->hdisplay
= vm
->hactive
;
569 dmode
->hsync_start
= dmode
->hdisplay
+ vm
->hfront_porch
;
570 dmode
->hsync_end
= dmode
->hsync_start
+ vm
->hsync_len
;
571 dmode
->htotal
= dmode
->hsync_end
+ vm
->hback_porch
;
573 dmode
->vdisplay
= vm
->vactive
;
574 dmode
->vsync_start
= dmode
->vdisplay
+ vm
->vfront_porch
;
575 dmode
->vsync_end
= dmode
->vsync_start
+ vm
->vsync_len
;
576 dmode
->vtotal
= dmode
->vsync_end
+ vm
->vback_porch
;
578 dmode
->clock
= vm
->pixelclock
/ 1000;
581 if (vm
->flags
& DISPLAY_FLAGS_HSYNC_HIGH
)
582 dmode
->flags
|= DRM_MODE_FLAG_PHSYNC
;
583 else if (vm
->flags
& DISPLAY_FLAGS_HSYNC_LOW
)
584 dmode
->flags
|= DRM_MODE_FLAG_NHSYNC
;
585 if (vm
->flags
& DISPLAY_FLAGS_VSYNC_HIGH
)
586 dmode
->flags
|= DRM_MODE_FLAG_PVSYNC
;
587 else if (vm
->flags
& DISPLAY_FLAGS_VSYNC_LOW
)
588 dmode
->flags
|= DRM_MODE_FLAG_NVSYNC
;
589 if (vm
->flags
& DISPLAY_FLAGS_INTERLACED
)
590 dmode
->flags
|= DRM_MODE_FLAG_INTERLACE
;
591 if (vm
->flags
& DISPLAY_FLAGS_DOUBLESCAN
)
592 dmode
->flags
|= DRM_MODE_FLAG_DBLSCAN
;
593 if (vm
->flags
& DISPLAY_FLAGS_DOUBLECLK
)
594 dmode
->flags
|= DRM_MODE_FLAG_DBLCLK
;
595 drm_mode_set_name(dmode
);
599 EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode
);
603 * of_get_drm_display_mode - get a drm_display_mode from devicetree
604 * @np: device_node with the timing specification
605 * @dmode: will be set to the return value
606 * @index: index into the list of display timings in devicetree
608 * This function is expensive and should only be used, if only one mode is to be
609 * read from DT. To get multiple modes start with of_get_display_timings and
610 * work with that instead.
612 int of_get_drm_display_mode(struct device_node
*np
,
613 struct drm_display_mode
*dmode
, int index
)
618 ret
= of_get_videomode(np
, &vm
, index
);
622 drm_display_mode_from_videomode(&vm
, dmode
);
624 pr_debug("%s: got %dx%d display mode from %s\n",
625 of_node_full_name(np
), vm
.hactive
, vm
.vactive
, np
->name
);
626 drm_mode_debug_printmodeline(dmode
);
630 EXPORT_SYMBOL_GPL(of_get_drm_display_mode
);
631 #endif /* CONFIG_OF */
632 #endif /* CONFIG_VIDEOMODE_HELPERS */
635 * drm_mode_set_name - set the name on a mode
636 * @mode: name will be set in this mode
638 * Set the name of @mode to a standard format.
640 void drm_mode_set_name(struct drm_display_mode
*mode
)
642 bool interlaced
= !!(mode
->flags
& DRM_MODE_FLAG_INTERLACE
);
644 snprintf(mode
->name
, DRM_DISPLAY_MODE_LEN
, "%dx%d%s",
645 mode
->hdisplay
, mode
->vdisplay
,
646 interlaced
? "i" : "");
648 EXPORT_SYMBOL(drm_mode_set_name
);
650 /** drm_mode_hsync - get the hsync of a mode
653 * Return @modes's hsync rate in kHz, rounded to the nearest int.
655 int drm_mode_hsync(const struct drm_display_mode
*mode
)
657 unsigned int calc_val
;
662 if (mode
->htotal
< 0)
665 calc_val
= (mode
->clock
* 1000) / mode
->htotal
; /* hsync in Hz */
666 calc_val
+= 500; /* round to 1000Hz */
667 calc_val
/= 1000; /* truncate to kHz */
671 EXPORT_SYMBOL(drm_mode_hsync
);
674 * drm_mode_vrefresh - get the vrefresh of a mode
677 * Return @mode's vrefresh rate in Hz or calculate it if necessary.
679 * FIXME: why is this needed? shouldn't vrefresh be set already?
682 * Vertical refresh rate. It will be the result of actual value plus 0.5.
683 * If it is 70.288, it will return 70Hz.
684 * If it is 59.6, it will return 60Hz.
686 int drm_mode_vrefresh(const struct drm_display_mode
*mode
)
689 unsigned int calc_val
;
691 if (mode
->vrefresh
> 0)
692 refresh
= mode
->vrefresh
;
693 else if (mode
->htotal
> 0 && mode
->vtotal
> 0) {
695 vtotal
= mode
->vtotal
;
696 /* work out vrefresh the value will be x1000 */
697 calc_val
= (mode
->clock
* 1000);
698 calc_val
/= mode
->htotal
;
699 refresh
= (calc_val
+ vtotal
/ 2) / vtotal
;
701 if (mode
->flags
& DRM_MODE_FLAG_INTERLACE
)
703 if (mode
->flags
& DRM_MODE_FLAG_DBLSCAN
)
706 refresh
/= mode
->vscan
;
710 EXPORT_SYMBOL(drm_mode_vrefresh
);
713 * drm_mode_set_crtcinfo - set CRTC modesetting parameters
715 * @adjust_flags: a combination of adjustment flags
717 * Setup the CRTC modesetting parameters for @p, adjusting if necessary.
719 * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
721 * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
722 * buffers containing two eyes (only adjust the timings when needed, eg. for
723 * "frame packing" or "side by side full").
725 void drm_mode_set_crtcinfo(struct drm_display_mode
*p
, int adjust_flags
)
727 if ((p
== NULL
) || ((p
->type
& DRM_MODE_TYPE_CRTC_C
) == DRM_MODE_TYPE_BUILTIN
))
730 p
->crtc_clock
= p
->clock
;
731 p
->crtc_hdisplay
= p
->hdisplay
;
732 p
->crtc_hsync_start
= p
->hsync_start
;
733 p
->crtc_hsync_end
= p
->hsync_end
;
734 p
->crtc_htotal
= p
->htotal
;
735 p
->crtc_hskew
= p
->hskew
;
736 p
->crtc_vdisplay
= p
->vdisplay
;
737 p
->crtc_vsync_start
= p
->vsync_start
;
738 p
->crtc_vsync_end
= p
->vsync_end
;
739 p
->crtc_vtotal
= p
->vtotal
;
741 if (p
->flags
& DRM_MODE_FLAG_INTERLACE
) {
742 if (adjust_flags
& CRTC_INTERLACE_HALVE_V
) {
743 p
->crtc_vdisplay
/= 2;
744 p
->crtc_vsync_start
/= 2;
745 p
->crtc_vsync_end
/= 2;
750 if (p
->flags
& DRM_MODE_FLAG_DBLSCAN
) {
751 p
->crtc_vdisplay
*= 2;
752 p
->crtc_vsync_start
*= 2;
753 p
->crtc_vsync_end
*= 2;
758 p
->crtc_vdisplay
*= p
->vscan
;
759 p
->crtc_vsync_start
*= p
->vscan
;
760 p
->crtc_vsync_end
*= p
->vscan
;
761 p
->crtc_vtotal
*= p
->vscan
;
764 if (adjust_flags
& CRTC_STEREO_DOUBLE
) {
765 unsigned int layout
= p
->flags
& DRM_MODE_FLAG_3D_MASK
;
768 case DRM_MODE_FLAG_3D_FRAME_PACKING
:
770 p
->crtc_vdisplay
+= p
->crtc_vtotal
;
771 p
->crtc_vsync_start
+= p
->crtc_vtotal
;
772 p
->crtc_vsync_end
+= p
->crtc_vtotal
;
773 p
->crtc_vtotal
+= p
->crtc_vtotal
;
778 p
->crtc_vblank_start
= min(p
->crtc_vsync_start
, p
->crtc_vdisplay
);
779 p
->crtc_vblank_end
= max(p
->crtc_vsync_end
, p
->crtc_vtotal
);
780 p
->crtc_hblank_start
= min(p
->crtc_hsync_start
, p
->crtc_hdisplay
);
781 p
->crtc_hblank_end
= max(p
->crtc_hsync_end
, p
->crtc_htotal
);
783 EXPORT_SYMBOL(drm_mode_set_crtcinfo
);
787 * drm_mode_copy - copy the mode
788 * @dst: mode to overwrite
791 * Copy an existing mode into another mode, preserving the object id and
792 * list head of the destination mode.
794 void drm_mode_copy(struct drm_display_mode
*dst
, const struct drm_display_mode
*src
)
796 int id
= dst
->base
.id
;
797 struct list_head head
= dst
->head
;
803 EXPORT_SYMBOL(drm_mode_copy
);
806 * drm_mode_duplicate - allocate and duplicate an existing mode
807 * @dev: drm_device to allocate the duplicated mode for
808 * @mode: mode to duplicate
810 * Just allocate a new mode, copy the existing mode into it, and return
811 * a pointer to it. Used to create new instances of established modes.
813 struct drm_display_mode
*drm_mode_duplicate(struct drm_device
*dev
,
814 const struct drm_display_mode
*mode
)
816 struct drm_display_mode
*nmode
;
818 nmode
= drm_mode_create(dev
);
822 drm_mode_copy(nmode
, mode
);
826 EXPORT_SYMBOL(drm_mode_duplicate
);
829 * drm_mode_equal - test modes for equality
831 * @mode2: second mode
833 * Check to see if @mode1 and @mode2 are equivalent.
836 * True if the modes are equal, false otherwise.
838 bool drm_mode_equal(const struct drm_display_mode
*mode1
, const struct drm_display_mode
*mode2
)
840 /* do clock check convert to PICOS so fb modes get matched
842 if (mode1
->clock
&& mode2
->clock
) {
843 if (KHZ2PICOS(mode1
->clock
) != KHZ2PICOS(mode2
->clock
))
845 } else if (mode1
->clock
!= mode2
->clock
)
848 if ((mode1
->flags
& DRM_MODE_FLAG_3D_MASK
) !=
849 (mode2
->flags
& DRM_MODE_FLAG_3D_MASK
))
852 return drm_mode_equal_no_clocks_no_stereo(mode1
, mode2
);
854 EXPORT_SYMBOL(drm_mode_equal
);
857 * drm_mode_equal_no_clocks_no_stereo - test modes for equality
859 * @mode2: second mode
861 * Check to see if @mode1 and @mode2 are equivalent, but
862 * don't check the pixel clocks nor the stereo layout.
865 * True if the modes are equal, false otherwise.
867 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode
*mode1
,
868 const struct drm_display_mode
*mode2
)
870 if (mode1
->hdisplay
== mode2
->hdisplay
&&
871 mode1
->hsync_start
== mode2
->hsync_start
&&
872 mode1
->hsync_end
== mode2
->hsync_end
&&
873 mode1
->htotal
== mode2
->htotal
&&
874 mode1
->hskew
== mode2
->hskew
&&
875 mode1
->vdisplay
== mode2
->vdisplay
&&
876 mode1
->vsync_start
== mode2
->vsync_start
&&
877 mode1
->vsync_end
== mode2
->vsync_end
&&
878 mode1
->vtotal
== mode2
->vtotal
&&
879 mode1
->vscan
== mode2
->vscan
&&
880 (mode1
->flags
& ~DRM_MODE_FLAG_3D_MASK
) ==
881 (mode2
->flags
& ~DRM_MODE_FLAG_3D_MASK
))
886 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo
);
889 * drm_mode_validate_size - make sure modes adhere to size constraints
891 * @mode_list: list of modes to check
892 * @maxX: maximum width
893 * @maxY: maximum height
894 * @maxPitch: max pitch
896 * The DRM device (@dev) has size and pitch limits. Here we validate the
897 * modes we probed for @dev against those limits and set their status as
900 void drm_mode_validate_size(struct drm_device
*dev
,
901 struct list_head
*mode_list
,
902 int maxX
, int maxY
, int maxPitch
)
904 struct drm_display_mode
*mode
;
906 list_for_each_entry(mode
, mode_list
, head
) {
907 if (maxPitch
> 0 && mode
->hdisplay
> maxPitch
)
908 mode
->status
= MODE_BAD_WIDTH
;
910 if (maxX
> 0 && mode
->hdisplay
> maxX
)
911 mode
->status
= MODE_VIRTUAL_X
;
913 if (maxY
> 0 && mode
->vdisplay
> maxY
)
914 mode
->status
= MODE_VIRTUAL_Y
;
917 EXPORT_SYMBOL(drm_mode_validate_size
);
920 * drm_mode_prune_invalid - remove invalid modes from mode list
922 * @mode_list: list of modes to check
923 * @verbose: be verbose about it
925 * Once mode list generation is complete, a caller can use this routine to
926 * remove invalid modes from a mode list. If any of the modes have a
927 * status other than %MODE_OK, they are removed from @mode_list and freed.
929 void drm_mode_prune_invalid(struct drm_device
*dev
,
930 struct list_head
*mode_list
, bool verbose
)
932 struct drm_display_mode
*mode
, *t
;
934 list_for_each_entry_safe(mode
, t
, mode_list
, head
) {
935 if (mode
->status
!= MODE_OK
) {
936 list_del(&mode
->head
);
938 drm_mode_debug_printmodeline(mode
);
939 DRM_DEBUG_KMS("Not using %s mode %d\n",
940 mode
->name
, mode
->status
);
942 drm_mode_destroy(dev
, mode
);
946 EXPORT_SYMBOL(drm_mode_prune_invalid
);
949 * drm_mode_compare - compare modes for favorability
951 * @lh_a: list_head for first mode
952 * @lh_b: list_head for second mode
954 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
958 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
959 * positive if @lh_b is better than @lh_a.
961 static int drm_mode_compare(void *priv
, struct list_head
*lh_a
, struct list_head
*lh_b
)
963 struct drm_display_mode
*a
= list_entry(lh_a
, struct drm_display_mode
, head
);
964 struct drm_display_mode
*b
= list_entry(lh_b
, struct drm_display_mode
, head
);
967 diff
= ((b
->type
& DRM_MODE_TYPE_PREFERRED
) != 0) -
968 ((a
->type
& DRM_MODE_TYPE_PREFERRED
) != 0);
971 diff
= b
->hdisplay
* b
->vdisplay
- a
->hdisplay
* a
->vdisplay
;
975 diff
= b
->vrefresh
- a
->vrefresh
;
979 diff
= b
->clock
- a
->clock
;
984 * drm_mode_sort - sort mode list
985 * @mode_list: list to sort
987 * Sort @mode_list by favorability, putting good modes first.
989 void drm_mode_sort(struct list_head
*mode_list
)
991 list_sort(NULL
, mode_list
, drm_mode_compare
);
993 EXPORT_SYMBOL(drm_mode_sort
);
996 * drm_mode_connector_list_update - update the mode list for the connector
997 * @connector: the connector to update
999 * This moves the modes from the @connector probed_modes list
1000 * to the actual mode list. It compares the probed mode against the current
1001 * list and only adds different modes. All modes unverified after this point
1002 * will be removed by the prune invalid modes.
1004 void drm_mode_connector_list_update(struct drm_connector
*connector
)
1006 struct drm_display_mode
*mode
;
1007 struct drm_display_mode
*pmode
, *pt
;
1010 WARN_ON(!mutex_is_locked(&connector
->dev
->mode_config
.mutex
));
1012 list_for_each_entry_safe(pmode
, pt
, &connector
->probed_modes
,
1015 /* go through current modes checking for the new probed mode */
1016 list_for_each_entry(mode
, &connector
->modes
, head
) {
1017 if (drm_mode_equal(pmode
, mode
)) {
1019 /* if equal delete the probed mode */
1020 mode
->status
= pmode
->status
;
1021 /* Merge type bits together */
1022 mode
->type
|= pmode
->type
;
1023 list_del(&pmode
->head
);
1024 drm_mode_destroy(connector
->dev
, pmode
);
1030 list_move_tail(&pmode
->head
, &connector
->modes
);
1034 EXPORT_SYMBOL(drm_mode_connector_list_update
);
1037 * drm_mode_parse_command_line_for_connector - parse command line for connector
1038 * @mode_option: per connector mode option
1039 * @connector: connector to parse line for
1040 * @mode: preallocated mode structure to fill out
1042 * This parses the connector specific then generic command lines for
1043 * modes and options to configure the connector.
1045 * This uses the same parameters as the fb modedb.c, except for extra
1046 * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1048 * enable/enable Digital/disable bit at the end
1050 bool drm_mode_parse_command_line_for_connector(const char *mode_option
,
1051 struct drm_connector
*connector
,
1052 struct drm_cmdline_mode
*mode
)
1055 unsigned int namelen
;
1056 bool res_specified
= false, bpp_specified
= false, refresh_specified
= false;
1057 unsigned int xres
= 0, yres
= 0, bpp
= 32, refresh
= 0;
1058 bool yres_specified
= false, cvt
= false, rb
= false;
1059 bool interlace
= false, margins
= false, was_digit
= false;
1061 enum drm_connector_force force
= DRM_FORCE_UNSPECIFIED
;
1065 mode_option
= fb_mode_option
;
1069 mode
->specified
= false;
1074 namelen
= strlen(name
);
1075 for (i
= namelen
-1; i
>= 0; i
--) {
1078 if (!refresh_specified
&& !bpp_specified
&&
1079 !yres_specified
&& !cvt
&& !rb
&& was_digit
) {
1080 refresh
= simple_strtol(&name
[i
+1], NULL
, 10);
1081 refresh_specified
= true;
1087 if (!bpp_specified
&& !yres_specified
&& !cvt
&&
1089 bpp
= simple_strtol(&name
[i
+1], NULL
, 10);
1090 bpp_specified
= true;
1096 if (!yres_specified
&& was_digit
) {
1097 yres
= simple_strtol(&name
[i
+1], NULL
, 10);
1098 yres_specified
= true;
1107 if (yres_specified
|| cvt
|| was_digit
)
1112 if (yres_specified
|| cvt
|| rb
|| was_digit
)
1117 if (cvt
|| yres_specified
|| was_digit
)
1122 if (cvt
|| yres_specified
|| was_digit
)
1127 if (yres_specified
|| bpp_specified
|| refresh_specified
||
1128 was_digit
|| (force
!= DRM_FORCE_UNSPECIFIED
))
1131 force
= DRM_FORCE_ON
;
1134 if (yres_specified
|| bpp_specified
|| refresh_specified
||
1135 was_digit
|| (force
!= DRM_FORCE_UNSPECIFIED
))
1138 if ((connector
->connector_type
!= DRM_MODE_CONNECTOR_DVII
) &&
1139 (connector
->connector_type
!= DRM_MODE_CONNECTOR_HDMIB
))
1140 force
= DRM_FORCE_ON
;
1142 force
= DRM_FORCE_ON_DIGITAL
;
1145 if (yres_specified
|| bpp_specified
|| refresh_specified
||
1146 was_digit
|| (force
!= DRM_FORCE_UNSPECIFIED
))
1149 force
= DRM_FORCE_OFF
;
1156 if (i
< 0 && yres_specified
) {
1158 xres
= simple_strtol(name
, &ch
, 10);
1159 if ((ch
!= NULL
) && (*ch
== 'x'))
1160 res_specified
= true;
1163 } else if (!yres_specified
&& was_digit
) {
1164 /* catch mode that begins with digits but has no 'x' */
1170 "parse error at position %i in video mode '%s'\n",
1172 mode
->specified
= false;
1176 if (res_specified
) {
1177 mode
->specified
= true;
1182 if (refresh_specified
) {
1183 mode
->refresh_specified
= true;
1184 mode
->refresh
= refresh
;
1187 if (bpp_specified
) {
1188 mode
->bpp_specified
= true;
1193 mode
->interlace
= interlace
;
1194 mode
->margins
= margins
;
1195 mode
->force
= force
;
1199 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector
);
1201 struct drm_display_mode
*
1202 drm_mode_create_from_cmdline_mode(struct drm_device
*dev
,
1203 struct drm_cmdline_mode
*cmd
)
1205 struct drm_display_mode
*mode
;
1208 mode
= drm_cvt_mode(dev
,
1209 cmd
->xres
, cmd
->yres
,
1210 cmd
->refresh_specified
? cmd
->refresh
: 60,
1211 cmd
->rb
, cmd
->interlace
,
1214 mode
= drm_gtf_mode(dev
,
1215 cmd
->xres
, cmd
->yres
,
1216 cmd
->refresh_specified
? cmd
->refresh
: 60,
1222 drm_mode_set_crtcinfo(mode
, CRTC_INTERLACE_HALVE_V
);
1225 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode
);