xref: /openbmc/linux/drivers/gpu/drm/drm_modes.c (revision 68198dca)
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  */
50 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
51 {
52 	DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
53 }
54 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
55 
56 /**
57  * drm_mode_create - create a new display mode
58  * @dev: DRM device
59  *
60  * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
61  * and return it.
62  *
63  * Returns:
64  * Pointer to new mode on success, NULL on error.
65  */
66 struct drm_display_mode *drm_mode_create(struct drm_device *dev)
67 {
68 	struct drm_display_mode *nmode;
69 
70 	nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
71 	if (!nmode)
72 		return NULL;
73 
74 	if (drm_mode_object_add(dev, &nmode->base, DRM_MODE_OBJECT_MODE)) {
75 		kfree(nmode);
76 		return NULL;
77 	}
78 
79 	return nmode;
80 }
81 EXPORT_SYMBOL(drm_mode_create);
82 
83 /**
84  * drm_mode_destroy - remove a mode
85  * @dev: DRM device
86  * @mode: mode to remove
87  *
88  * Release @mode's unique ID, then free it @mode structure itself using kfree.
89  */
90 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
91 {
92 	if (!mode)
93 		return;
94 
95 	drm_mode_object_unregister(dev, &mode->base);
96 
97 	kfree(mode);
98 }
99 EXPORT_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  */
110 void 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 }
117 EXPORT_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  */
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)
146 {
147 #define HV_FACTOR			1000
148 	/* 1) top/bottom margin size (% of height) - default: 1.8, */
149 #define	CVT_MARGIN_PERCENTAGE		18
150 	/* 2) character cell horizontal granularity (pixels) - default 8 */
151 #define	CVT_H_GRANULARITY		8
152 	/* 3) Minimum vertical porch (lines) - default 3 */
153 #define	CVT_MIN_V_PORCH			3
154 	/* 4) Minimum number of vertical back porch lines - default 6 */
155 #define	CVT_MIN_V_BPORCH		6
156 	/* Pixel Clock step (kHz) */
157 #define CVT_CLOCK_STEP			250
158 	struct drm_display_mode *drm_mode;
159 	unsigned int vfieldrate, hperiod;
160 	int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
161 	int interlace;
162 	u64 tmp;
163 
164 	/* allocate the drm_display_mode structure. If failure, we will
165 	 * return directly
166 	 */
167 	drm_mode = drm_mode_create(dev);
168 	if (!drm_mode)
169 		return NULL;
170 
171 	/* the CVT default refresh rate is 60Hz */
172 	if (!vrefresh)
173 		vrefresh = 60;
174 
175 	/* the required field fresh rate */
176 	if (interlaced)
177 		vfieldrate = vrefresh * 2;
178 	else
179 		vfieldrate = vrefresh;
180 
181 	/* horizontal pixels */
182 	hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
183 
184 	/* determine the left&right borders */
185 	hmargin = 0;
186 	if (margins) {
187 		hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
188 		hmargin -= hmargin % CVT_H_GRANULARITY;
189 	}
190 	/* find the total active pixels */
191 	drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
192 
193 	/* find the number of lines per field */
194 	if (interlaced)
195 		vdisplay_rnd = vdisplay / 2;
196 	else
197 		vdisplay_rnd = vdisplay;
198 
199 	/* find the top & bottom borders */
200 	vmargin = 0;
201 	if (margins)
202 		vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
203 
204 	drm_mode->vdisplay = vdisplay + 2 * vmargin;
205 
206 	/* Interlaced */
207 	if (interlaced)
208 		interlace = 1;
209 	else
210 		interlace = 0;
211 
212 	/* Determine VSync Width from aspect ratio */
213 	if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
214 		vsync = 4;
215 	else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
216 		vsync = 5;
217 	else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
218 		vsync = 6;
219 	else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
220 		vsync = 7;
221 	else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
222 		vsync = 7;
223 	else /* custom */
224 		vsync = 10;
225 
226 	if (!reduced) {
227 		/* simplify the GTF calculation */
228 		/* 4) Minimum time of vertical sync + back porch interval (µs)
229 		 * default 550.0
230 		 */
231 		int tmp1, tmp2;
232 #define CVT_MIN_VSYNC_BP	550
233 		/* 3) Nominal HSync width (% of line period) - default 8 */
234 #define CVT_HSYNC_PERCENTAGE	8
235 		unsigned int hblank_percentage;
236 		int vsyncandback_porch, vback_porch, hblank;
237 
238 		/* estimated the horizontal period */
239 		tmp1 = HV_FACTOR * 1000000  -
240 				CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
241 		tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
242 				interlace;
243 		hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
244 
245 		tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
246 		/* 9. Find number of lines in sync + backporch */
247 		if (tmp1 < (vsync + CVT_MIN_V_PORCH))
248 			vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
249 		else
250 			vsyncandback_porch = tmp1;
251 		/* 10. Find number of lines in back porch */
252 		vback_porch = vsyncandback_porch - vsync;
253 		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
254 				vsyncandback_porch + CVT_MIN_V_PORCH;
255 		/* 5) Definition of Horizontal blanking time limitation */
256 		/* Gradient (%/kHz) - default 600 */
257 #define CVT_M_FACTOR	600
258 		/* Offset (%) - default 40 */
259 #define CVT_C_FACTOR	40
260 		/* Blanking time scaling factor - default 128 */
261 #define CVT_K_FACTOR	128
262 		/* Scaling factor weighting - default 20 */
263 #define CVT_J_FACTOR	20
264 #define CVT_M_PRIME	(CVT_M_FACTOR * CVT_K_FACTOR / 256)
265 #define CVT_C_PRIME	((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
266 			 CVT_J_FACTOR)
267 		/* 12. Find ideal blanking duty cycle from formula */
268 		hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
269 					hperiod / 1000;
270 		/* 13. Blanking time */
271 		if (hblank_percentage < 20 * HV_FACTOR)
272 			hblank_percentage = 20 * HV_FACTOR;
273 		hblank = drm_mode->hdisplay * hblank_percentage /
274 			 (100 * HV_FACTOR - hblank_percentage);
275 		hblank -= hblank % (2 * CVT_H_GRANULARITY);
276 		/* 14. find the total pixels per line */
277 		drm_mode->htotal = drm_mode->hdisplay + hblank;
278 		drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
279 		drm_mode->hsync_start = drm_mode->hsync_end -
280 			(drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
281 		drm_mode->hsync_start += CVT_H_GRANULARITY -
282 			drm_mode->hsync_start % CVT_H_GRANULARITY;
283 		/* fill the Vsync values */
284 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
285 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
286 	} else {
287 		/* Reduced blanking */
288 		/* Minimum vertical blanking interval time (µs)- default 460 */
289 #define CVT_RB_MIN_VBLANK	460
290 		/* Fixed number of clocks for horizontal sync */
291 #define CVT_RB_H_SYNC		32
292 		/* Fixed number of clocks for horizontal blanking */
293 #define CVT_RB_H_BLANK		160
294 		/* Fixed number of lines for vertical front porch - default 3*/
295 #define CVT_RB_VFPORCH		3
296 		int vbilines;
297 		int tmp1, tmp2;
298 		/* 8. Estimate Horizontal period. */
299 		tmp1 = HV_FACTOR * 1000000 -
300 			CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
301 		tmp2 = vdisplay_rnd + 2 * vmargin;
302 		hperiod = tmp1 / (tmp2 * vfieldrate);
303 		/* 9. Find number of lines in vertical blanking */
304 		vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
305 		/* 10. Check if vertical blanking is sufficient */
306 		if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
307 			vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
308 		/* 11. Find total number of lines in vertical field */
309 		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
310 		/* 12. Find total number of pixels in a line */
311 		drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
312 		/* Fill in HSync values */
313 		drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
314 		drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
315 		/* Fill in VSync values */
316 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
317 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
318 	}
319 	/* 15/13. Find pixel clock frequency (kHz for xf86) */
320 	tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
321 	tmp *= HV_FACTOR * 1000;
322 	do_div(tmp, hperiod);
323 	tmp -= drm_mode->clock % CVT_CLOCK_STEP;
324 	drm_mode->clock = tmp;
325 	/* 18/16. Find actual vertical frame frequency */
326 	/* ignore - just set the mode flag for interlaced */
327 	if (interlaced) {
328 		drm_mode->vtotal *= 2;
329 		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
330 	}
331 	/* Fill the mode line name */
332 	drm_mode_set_name(drm_mode);
333 	if (reduced)
334 		drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
335 					DRM_MODE_FLAG_NVSYNC);
336 	else
337 		drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
338 					DRM_MODE_FLAG_NHSYNC);
339 
340 	return drm_mode;
341 }
342 EXPORT_SYMBOL(drm_cvt_mode);
343 
344 /**
345  * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
346  * @dev: drm device
347  * @hdisplay: hdisplay size
348  * @vdisplay: vdisplay size
349  * @vrefresh: vrefresh rate.
350  * @interlaced: whether to compute an interlaced mode
351  * @margins: desired margin (borders) size
352  * @GTF_M: extended GTF formula parameters
353  * @GTF_2C: extended GTF formula parameters
354  * @GTF_K: extended GTF formula parameters
355  * @GTF_2J: extended GTF formula parameters
356  *
357  * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
358  * in here multiplied by two.  For a C of 40, pass in 80.
359  *
360  * Returns:
361  * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
362  * The display mode object is allocated with drm_mode_create(). Returns NULL
363  * when no mode could be allocated.
364  */
365 struct drm_display_mode *
366 drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
367 		     int vrefresh, bool interlaced, int margins,
368 		     int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
369 {	/* 1) top/bottom margin size (% of height) - default: 1.8, */
370 #define	GTF_MARGIN_PERCENTAGE		18
371 	/* 2) character cell horizontal granularity (pixels) - default 8 */
372 #define	GTF_CELL_GRAN			8
373 	/* 3) Minimum vertical porch (lines) - default 3 */
374 #define	GTF_MIN_V_PORCH			1
375 	/* width of vsync in lines */
376 #define V_SYNC_RQD			3
377 	/* width of hsync as % of total line */
378 #define H_SYNC_PERCENT			8
379 	/* min time of vsync + back porch (microsec) */
380 #define MIN_VSYNC_PLUS_BP		550
381 	/* C' and M' are part of the Blanking Duty Cycle computation */
382 #define GTF_C_PRIME	((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
383 #define GTF_M_PRIME	(GTF_K * GTF_M / 256)
384 	struct drm_display_mode *drm_mode;
385 	unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
386 	int top_margin, bottom_margin;
387 	int interlace;
388 	unsigned int hfreq_est;
389 	int vsync_plus_bp, vback_porch;
390 	unsigned int vtotal_lines, vfieldrate_est, hperiod;
391 	unsigned int vfield_rate, vframe_rate;
392 	int left_margin, right_margin;
393 	unsigned int total_active_pixels, ideal_duty_cycle;
394 	unsigned int hblank, total_pixels, pixel_freq;
395 	int hsync, hfront_porch, vodd_front_porch_lines;
396 	unsigned int tmp1, tmp2;
397 
398 	drm_mode = drm_mode_create(dev);
399 	if (!drm_mode)
400 		return NULL;
401 
402 	/* 1. In order to give correct results, the number of horizontal
403 	 * pixels requested is first processed to ensure that it is divisible
404 	 * by the character size, by rounding it to the nearest character
405 	 * cell boundary:
406 	 */
407 	hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
408 	hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
409 
410 	/* 2. If interlace is requested, the number of vertical lines assumed
411 	 * by the calculation must be halved, as the computation calculates
412 	 * the number of vertical lines per field.
413 	 */
414 	if (interlaced)
415 		vdisplay_rnd = vdisplay / 2;
416 	else
417 		vdisplay_rnd = vdisplay;
418 
419 	/* 3. Find the frame rate required: */
420 	if (interlaced)
421 		vfieldrate_rqd = vrefresh * 2;
422 	else
423 		vfieldrate_rqd = vrefresh;
424 
425 	/* 4. Find number of lines in Top margin: */
426 	top_margin = 0;
427 	if (margins)
428 		top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
429 				1000;
430 	/* 5. Find number of lines in bottom margin: */
431 	bottom_margin = top_margin;
432 
433 	/* 6. If interlace is required, then set variable interlace: */
434 	if (interlaced)
435 		interlace = 1;
436 	else
437 		interlace = 0;
438 
439 	/* 7. Estimate the Horizontal frequency */
440 	{
441 		tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
442 		tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
443 				2 + interlace;
444 		hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
445 	}
446 
447 	/* 8. Find the number of lines in V sync + back porch */
448 	/* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
449 	vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
450 	vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
451 	/*  9. Find the number of lines in V back porch alone: */
452 	vback_porch = vsync_plus_bp - V_SYNC_RQD;
453 	/*  10. Find the total number of lines in Vertical field period: */
454 	vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
455 			vsync_plus_bp + GTF_MIN_V_PORCH;
456 	/*  11. Estimate the Vertical field frequency: */
457 	vfieldrate_est = hfreq_est / vtotal_lines;
458 	/*  12. Find the actual horizontal period: */
459 	hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
460 
461 	/*  13. Find the actual Vertical field frequency: */
462 	vfield_rate = hfreq_est / vtotal_lines;
463 	/*  14. Find the Vertical frame frequency: */
464 	if (interlaced)
465 		vframe_rate = vfield_rate / 2;
466 	else
467 		vframe_rate = vfield_rate;
468 	/*  15. Find number of pixels in left margin: */
469 	if (margins)
470 		left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
471 				1000;
472 	else
473 		left_margin = 0;
474 
475 	/* 16.Find number of pixels in right margin: */
476 	right_margin = left_margin;
477 	/* 17.Find total number of active pixels in image and left and right */
478 	total_active_pixels = hdisplay_rnd + left_margin + right_margin;
479 	/* 18.Find the ideal blanking duty cycle from blanking duty cycle */
480 	ideal_duty_cycle = GTF_C_PRIME * 1000 -
481 				(GTF_M_PRIME * 1000000 / hfreq_est);
482 	/* 19.Find the number of pixels in the blanking time to the nearest
483 	 * double character cell: */
484 	hblank = total_active_pixels * ideal_duty_cycle /
485 			(100000 - ideal_duty_cycle);
486 	hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
487 	hblank = hblank * 2 * GTF_CELL_GRAN;
488 	/* 20.Find total number of pixels: */
489 	total_pixels = total_active_pixels + hblank;
490 	/* 21.Find pixel clock frequency: */
491 	pixel_freq = total_pixels * hfreq_est / 1000;
492 	/* Stage 1 computations are now complete; I should really pass
493 	 * the results to another function and do the Stage 2 computations,
494 	 * but I only need a few more values so I'll just append the
495 	 * computations here for now */
496 	/* 17. Find the number of pixels in the horizontal sync period: */
497 	hsync = H_SYNC_PERCENT * total_pixels / 100;
498 	hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
499 	hsync = hsync * GTF_CELL_GRAN;
500 	/* 18. Find the number of pixels in horizontal front porch period */
501 	hfront_porch = hblank / 2 - hsync;
502 	/*  36. Find the number of lines in the odd front porch period: */
503 	vodd_front_porch_lines = GTF_MIN_V_PORCH ;
504 
505 	/* finally, pack the results in the mode struct */
506 	drm_mode->hdisplay = hdisplay_rnd;
507 	drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
508 	drm_mode->hsync_end = drm_mode->hsync_start + hsync;
509 	drm_mode->htotal = total_pixels;
510 	drm_mode->vdisplay = vdisplay_rnd;
511 	drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
512 	drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
513 	drm_mode->vtotal = vtotal_lines;
514 
515 	drm_mode->clock = pixel_freq;
516 
517 	if (interlaced) {
518 		drm_mode->vtotal *= 2;
519 		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
520 	}
521 
522 	drm_mode_set_name(drm_mode);
523 	if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
524 		drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
525 	else
526 		drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
527 
528 	return drm_mode;
529 }
530 EXPORT_SYMBOL(drm_gtf_mode_complex);
531 
532 /**
533  * drm_gtf_mode - create the modeline based on the GTF algorithm
534  * @dev: drm device
535  * @hdisplay: hdisplay size
536  * @vdisplay: vdisplay size
537  * @vrefresh: vrefresh rate.
538  * @interlaced: whether to compute an interlaced mode
539  * @margins: desired margin (borders) size
540  *
541  * return the modeline based on GTF algorithm
542  *
543  * This function is to create the modeline based on the GTF algorithm.
544  * Generalized Timing Formula is derived from:
545  *
546  *	GTF Spreadsheet by Andy Morrish (1/5/97)
547  *	available at http://www.vesa.org
548  *
549  * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
550  * What I have done is to translate it by using integer calculation.
551  * I also refer to the function of fb_get_mode in the file of
552  * drivers/video/fbmon.c
553  *
554  * Standard GTF parameters::
555  *
556  *     M = 600
557  *     C = 40
558  *     K = 128
559  *     J = 20
560  *
561  * Returns:
562  * The modeline based on the GTF algorithm stored in a drm_display_mode object.
563  * The display mode object is allocated with drm_mode_create(). Returns NULL
564  * when no mode could be allocated.
565  */
566 struct drm_display_mode *
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  */
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  */
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 /**
659  * drm_bus_flags_from_videomode - extract information about pixelclk and
660  * DE polarity from videomode and store it in a separate variable
661  * @vm: videomode structure to use
662  * @bus_flags: information about pixelclk and DE polarity will be stored here
663  *
664  * Sets DRM_BUS_FLAG_DE_(LOW|HIGH) and DRM_BUS_FLAG_PIXDATA_(POS|NEG)EDGE
665  * in @bus_flags according to DISPLAY_FLAGS found in @vm
666  */
667 void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
668 {
669 	*bus_flags = 0;
670 	if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
671 		*bus_flags |= DRM_BUS_FLAG_PIXDATA_POSEDGE;
672 	if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
673 		*bus_flags |= DRM_BUS_FLAG_PIXDATA_NEGEDGE;
674 
675 	if (vm->flags & DISPLAY_FLAGS_DE_LOW)
676 		*bus_flags |= DRM_BUS_FLAG_DE_LOW;
677 	if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
678 		*bus_flags |= DRM_BUS_FLAG_DE_HIGH;
679 }
680 EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
681 
682 #ifdef CONFIG_OF
683 /**
684  * of_get_drm_display_mode - get a drm_display_mode from devicetree
685  * @np: device_node with the timing specification
686  * @dmode: will be set to the return value
687  * @bus_flags: information about pixelclk and DE polarity
688  * @index: index into the list of display timings in devicetree
689  *
690  * This function is expensive and should only be used, if only one mode is to be
691  * read from DT. To get multiple modes start with of_get_display_timings and
692  * work with that instead.
693  *
694  * Returns:
695  * 0 on success, a negative errno code when no of videomode node was found.
696  */
697 int of_get_drm_display_mode(struct device_node *np,
698 			    struct drm_display_mode *dmode, u32 *bus_flags,
699 			    int index)
700 {
701 	struct videomode vm;
702 	int ret;
703 
704 	ret = of_get_videomode(np, &vm, index);
705 	if (ret)
706 		return ret;
707 
708 	drm_display_mode_from_videomode(&vm, dmode);
709 	if (bus_flags)
710 		drm_bus_flags_from_videomode(&vm, bus_flags);
711 
712 	pr_debug("%pOF: got %dx%d display mode from %s\n",
713 		np, vm.hactive, vm.vactive, np->name);
714 	drm_mode_debug_printmodeline(dmode);
715 
716 	return 0;
717 }
718 EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
719 #endif /* CONFIG_OF */
720 #endif /* CONFIG_VIDEOMODE_HELPERS */
721 
722 /**
723  * drm_mode_set_name - set the name on a mode
724  * @mode: name will be set in this mode
725  *
726  * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
727  * with an optional 'i' suffix for interlaced modes.
728  */
729 void drm_mode_set_name(struct drm_display_mode *mode)
730 {
731 	bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
732 
733 	snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
734 		 mode->hdisplay, mode->vdisplay,
735 		 interlaced ? "i" : "");
736 }
737 EXPORT_SYMBOL(drm_mode_set_name);
738 
739 /**
740  * drm_mode_hsync - get the hsync of a mode
741  * @mode: mode
742  *
743  * Returns:
744  * @modes's hsync rate in kHz, rounded to the nearest integer. Calculates the
745  * value first if it is not yet set.
746  */
747 int drm_mode_hsync(const struct drm_display_mode *mode)
748 {
749 	unsigned int calc_val;
750 
751 	if (mode->hsync)
752 		return mode->hsync;
753 
754 	if (mode->htotal < 0)
755 		return 0;
756 
757 	calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
758 	calc_val += 500;				/* round to 1000Hz */
759 	calc_val /= 1000;				/* truncate to kHz */
760 
761 	return calc_val;
762 }
763 EXPORT_SYMBOL(drm_mode_hsync);
764 
765 /**
766  * drm_mode_vrefresh - get the vrefresh of a mode
767  * @mode: mode
768  *
769  * Returns:
770  * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
771  * value first if it is not yet set.
772  */
773 int drm_mode_vrefresh(const struct drm_display_mode *mode)
774 {
775 	int refresh = 0;
776 	unsigned int calc_val;
777 
778 	if (mode->vrefresh > 0)
779 		refresh = mode->vrefresh;
780 	else if (mode->htotal > 0 && mode->vtotal > 0) {
781 		int vtotal;
782 		vtotal = mode->vtotal;
783 		/* work out vrefresh the value will be x1000 */
784 		calc_val = (mode->clock * 1000);
785 		calc_val /= mode->htotal;
786 		refresh = (calc_val + vtotal / 2) / vtotal;
787 
788 		if (mode->flags & DRM_MODE_FLAG_INTERLACE)
789 			refresh *= 2;
790 		if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
791 			refresh /= 2;
792 		if (mode->vscan > 1)
793 			refresh /= mode->vscan;
794 	}
795 	return refresh;
796 }
797 EXPORT_SYMBOL(drm_mode_vrefresh);
798 
799 /**
800  * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
801  * @mode: mode to query
802  * @hdisplay: hdisplay value to fill in
803  * @vdisplay: vdisplay value to fill in
804  *
805  * The vdisplay value will be doubled if the specified mode is a stereo mode of
806  * the appropriate layout.
807  */
808 void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
809 			    int *hdisplay, int *vdisplay)
810 {
811 	struct drm_display_mode adjusted = *mode;
812 
813 	drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
814 	*hdisplay = adjusted.crtc_hdisplay;
815 	*vdisplay = adjusted.crtc_vdisplay;
816 }
817 EXPORT_SYMBOL(drm_mode_get_hv_timing);
818 
819 /**
820  * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
821  * @p: mode
822  * @adjust_flags: a combination of adjustment flags
823  *
824  * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
825  *
826  * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
827  *   interlaced modes.
828  * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
829  *   buffers containing two eyes (only adjust the timings when needed, eg. for
830  *   "frame packing" or "side by side full").
831  * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
832  *   be performed for doublescan and vscan > 1 modes respectively.
833  */
834 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
835 {
836 	if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
837 		return;
838 
839 	p->crtc_clock = p->clock;
840 	p->crtc_hdisplay = p->hdisplay;
841 	p->crtc_hsync_start = p->hsync_start;
842 	p->crtc_hsync_end = p->hsync_end;
843 	p->crtc_htotal = p->htotal;
844 	p->crtc_hskew = p->hskew;
845 	p->crtc_vdisplay = p->vdisplay;
846 	p->crtc_vsync_start = p->vsync_start;
847 	p->crtc_vsync_end = p->vsync_end;
848 	p->crtc_vtotal = p->vtotal;
849 
850 	if (p->flags & DRM_MODE_FLAG_INTERLACE) {
851 		if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
852 			p->crtc_vdisplay /= 2;
853 			p->crtc_vsync_start /= 2;
854 			p->crtc_vsync_end /= 2;
855 			p->crtc_vtotal /= 2;
856 		}
857 	}
858 
859 	if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
860 		if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
861 			p->crtc_vdisplay *= 2;
862 			p->crtc_vsync_start *= 2;
863 			p->crtc_vsync_end *= 2;
864 			p->crtc_vtotal *= 2;
865 		}
866 	}
867 
868 	if (!(adjust_flags & CRTC_NO_VSCAN)) {
869 		if (p->vscan > 1) {
870 			p->crtc_vdisplay *= p->vscan;
871 			p->crtc_vsync_start *= p->vscan;
872 			p->crtc_vsync_end *= p->vscan;
873 			p->crtc_vtotal *= p->vscan;
874 		}
875 	}
876 
877 	if (adjust_flags & CRTC_STEREO_DOUBLE) {
878 		unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
879 
880 		switch (layout) {
881 		case DRM_MODE_FLAG_3D_FRAME_PACKING:
882 			p->crtc_clock *= 2;
883 			p->crtc_vdisplay += p->crtc_vtotal;
884 			p->crtc_vsync_start += p->crtc_vtotal;
885 			p->crtc_vsync_end += p->crtc_vtotal;
886 			p->crtc_vtotal += p->crtc_vtotal;
887 			break;
888 		}
889 	}
890 
891 	p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
892 	p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
893 	p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
894 	p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
895 }
896 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
897 
898 /**
899  * drm_mode_copy - copy the mode
900  * @dst: mode to overwrite
901  * @src: mode to copy
902  *
903  * Copy an existing mode into another mode, preserving the object id and
904  * list head of the destination mode.
905  */
906 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
907 {
908 	int id = dst->base.id;
909 	struct list_head head = dst->head;
910 
911 	*dst = *src;
912 	dst->base.id = id;
913 	dst->head = head;
914 }
915 EXPORT_SYMBOL(drm_mode_copy);
916 
917 /**
918  * drm_mode_duplicate - allocate and duplicate an existing mode
919  * @dev: drm_device to allocate the duplicated mode for
920  * @mode: mode to duplicate
921  *
922  * Just allocate a new mode, copy the existing mode into it, and return
923  * a pointer to it.  Used to create new instances of established modes.
924  *
925  * Returns:
926  * Pointer to duplicated mode on success, NULL on error.
927  */
928 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
929 					    const struct drm_display_mode *mode)
930 {
931 	struct drm_display_mode *nmode;
932 
933 	nmode = drm_mode_create(dev);
934 	if (!nmode)
935 		return NULL;
936 
937 	drm_mode_copy(nmode, mode);
938 
939 	return nmode;
940 }
941 EXPORT_SYMBOL(drm_mode_duplicate);
942 
943 /**
944  * drm_mode_equal - test modes for equality
945  * @mode1: first mode
946  * @mode2: second mode
947  *
948  * Check to see if @mode1 and @mode2 are equivalent.
949  *
950  * Returns:
951  * True if the modes are equal, false otherwise.
952  */
953 bool drm_mode_equal(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
954 {
955 	if (!mode1 && !mode2)
956 		return true;
957 
958 	if (!mode1 || !mode2)
959 		return false;
960 
961 	/* do clock check convert to PICOS so fb modes get matched
962 	 * the same */
963 	if (mode1->clock && mode2->clock) {
964 		if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
965 			return false;
966 	} else if (mode1->clock != mode2->clock)
967 		return false;
968 
969 	return drm_mode_equal_no_clocks(mode1, mode2);
970 }
971 EXPORT_SYMBOL(drm_mode_equal);
972 
973 /**
974  * drm_mode_equal_no_clocks - test modes for equality
975  * @mode1: first mode
976  * @mode2: second mode
977  *
978  * Check to see if @mode1 and @mode2 are equivalent, but
979  * don't check the pixel clocks.
980  *
981  * Returns:
982  * True if the modes are equal, false otherwise.
983  */
984 bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
985 {
986 	if ((mode1->flags & DRM_MODE_FLAG_3D_MASK) !=
987 	    (mode2->flags & DRM_MODE_FLAG_3D_MASK))
988 		return false;
989 
990 	return drm_mode_equal_no_clocks_no_stereo(mode1, mode2);
991 }
992 EXPORT_SYMBOL(drm_mode_equal_no_clocks);
993 
994 /**
995  * drm_mode_equal_no_clocks_no_stereo - test modes for equality
996  * @mode1: first mode
997  * @mode2: second mode
998  *
999  * Check to see if @mode1 and @mode2 are equivalent, but
1000  * don't check the pixel clocks nor the stereo layout.
1001  *
1002  * Returns:
1003  * True if the modes are equal, false otherwise.
1004  */
1005 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
1006 					const struct drm_display_mode *mode2)
1007 {
1008 	if (mode1->hdisplay == mode2->hdisplay &&
1009 	    mode1->hsync_start == mode2->hsync_start &&
1010 	    mode1->hsync_end == mode2->hsync_end &&
1011 	    mode1->htotal == mode2->htotal &&
1012 	    mode1->hskew == mode2->hskew &&
1013 	    mode1->vdisplay == mode2->vdisplay &&
1014 	    mode1->vsync_start == mode2->vsync_start &&
1015 	    mode1->vsync_end == mode2->vsync_end &&
1016 	    mode1->vtotal == mode2->vtotal &&
1017 	    mode1->vscan == mode2->vscan &&
1018 	    (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
1019 	     (mode2->flags & ~DRM_MODE_FLAG_3D_MASK))
1020 		return true;
1021 
1022 	return false;
1023 }
1024 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
1025 
1026 /**
1027  * drm_mode_validate_basic - make sure the mode is somewhat sane
1028  * @mode: mode to check
1029  *
1030  * Check that the mode timings are at least somewhat reasonable.
1031  * Any hardware specific limits are left up for each driver to check.
1032  *
1033  * Returns:
1034  * The mode status
1035  */
1036 enum drm_mode_status
1037 drm_mode_validate_basic(const struct drm_display_mode *mode)
1038 {
1039 	if (mode->clock == 0)
1040 		return MODE_CLOCK_LOW;
1041 
1042 	if (mode->hdisplay == 0 ||
1043 	    mode->hsync_start < mode->hdisplay ||
1044 	    mode->hsync_end < mode->hsync_start ||
1045 	    mode->htotal < mode->hsync_end)
1046 		return MODE_H_ILLEGAL;
1047 
1048 	if (mode->vdisplay == 0 ||
1049 	    mode->vsync_start < mode->vdisplay ||
1050 	    mode->vsync_end < mode->vsync_start ||
1051 	    mode->vtotal < mode->vsync_end)
1052 		return MODE_V_ILLEGAL;
1053 
1054 	return MODE_OK;
1055 }
1056 EXPORT_SYMBOL(drm_mode_validate_basic);
1057 
1058 /**
1059  * drm_mode_validate_size - make sure modes adhere to size constraints
1060  * @mode: mode to check
1061  * @maxX: maximum width
1062  * @maxY: maximum height
1063  *
1064  * This function is a helper which can be used to validate modes against size
1065  * limitations of the DRM device/connector. If a mode is too big its status
1066  * member is updated with the appropriate validation failure code. The list
1067  * itself is not changed.
1068  *
1069  * Returns:
1070  * The mode status
1071  */
1072 enum drm_mode_status
1073 drm_mode_validate_size(const struct drm_display_mode *mode,
1074 		       int maxX, int maxY)
1075 {
1076 	if (maxX > 0 && mode->hdisplay > maxX)
1077 		return MODE_VIRTUAL_X;
1078 
1079 	if (maxY > 0 && mode->vdisplay > maxY)
1080 		return MODE_VIRTUAL_Y;
1081 
1082 	return MODE_OK;
1083 }
1084 EXPORT_SYMBOL(drm_mode_validate_size);
1085 
1086 /**
1087  * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
1088  * @mode: mode to check
1089  * @connector: drm connector under action
1090  *
1091  * This function is a helper which can be used to filter out any YCBCR420
1092  * only mode, when the source doesn't support it.
1093  *
1094  * Returns:
1095  * The mode status
1096  */
1097 enum drm_mode_status
1098 drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
1099 			   struct drm_connector *connector)
1100 {
1101 	u8 vic = drm_match_cea_mode(mode);
1102 	enum drm_mode_status status = MODE_OK;
1103 	struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
1104 
1105 	if (test_bit(vic, hdmi->y420_vdb_modes)) {
1106 		if (!connector->ycbcr_420_allowed)
1107 			status = MODE_NO_420;
1108 	}
1109 
1110 	return status;
1111 }
1112 EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
1113 
1114 #define MODE_STATUS(status) [MODE_ ## status + 3] = #status
1115 
1116 static const char * const drm_mode_status_names[] = {
1117 	MODE_STATUS(OK),
1118 	MODE_STATUS(HSYNC),
1119 	MODE_STATUS(VSYNC),
1120 	MODE_STATUS(H_ILLEGAL),
1121 	MODE_STATUS(V_ILLEGAL),
1122 	MODE_STATUS(BAD_WIDTH),
1123 	MODE_STATUS(NOMODE),
1124 	MODE_STATUS(NO_INTERLACE),
1125 	MODE_STATUS(NO_DBLESCAN),
1126 	MODE_STATUS(NO_VSCAN),
1127 	MODE_STATUS(MEM),
1128 	MODE_STATUS(VIRTUAL_X),
1129 	MODE_STATUS(VIRTUAL_Y),
1130 	MODE_STATUS(MEM_VIRT),
1131 	MODE_STATUS(NOCLOCK),
1132 	MODE_STATUS(CLOCK_HIGH),
1133 	MODE_STATUS(CLOCK_LOW),
1134 	MODE_STATUS(CLOCK_RANGE),
1135 	MODE_STATUS(BAD_HVALUE),
1136 	MODE_STATUS(BAD_VVALUE),
1137 	MODE_STATUS(BAD_VSCAN),
1138 	MODE_STATUS(HSYNC_NARROW),
1139 	MODE_STATUS(HSYNC_WIDE),
1140 	MODE_STATUS(HBLANK_NARROW),
1141 	MODE_STATUS(HBLANK_WIDE),
1142 	MODE_STATUS(VSYNC_NARROW),
1143 	MODE_STATUS(VSYNC_WIDE),
1144 	MODE_STATUS(VBLANK_NARROW),
1145 	MODE_STATUS(VBLANK_WIDE),
1146 	MODE_STATUS(PANEL),
1147 	MODE_STATUS(INTERLACE_WIDTH),
1148 	MODE_STATUS(ONE_WIDTH),
1149 	MODE_STATUS(ONE_HEIGHT),
1150 	MODE_STATUS(ONE_SIZE),
1151 	MODE_STATUS(NO_REDUCED),
1152 	MODE_STATUS(NO_STEREO),
1153 	MODE_STATUS(NO_420),
1154 	MODE_STATUS(STALE),
1155 	MODE_STATUS(BAD),
1156 	MODE_STATUS(ERROR),
1157 };
1158 
1159 #undef MODE_STATUS
1160 
1161 static const char *drm_get_mode_status_name(enum drm_mode_status status)
1162 {
1163 	int index = status + 3;
1164 
1165 	if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
1166 		return "";
1167 
1168 	return drm_mode_status_names[index];
1169 }
1170 
1171 /**
1172  * drm_mode_prune_invalid - remove invalid modes from mode list
1173  * @dev: DRM device
1174  * @mode_list: list of modes to check
1175  * @verbose: be verbose about it
1176  *
1177  * This helper function can be used to prune a display mode list after
1178  * validation has been completed. All modes who's status is not MODE_OK will be
1179  * removed from the list, and if @verbose the status code and mode name is also
1180  * printed to dmesg.
1181  */
1182 void drm_mode_prune_invalid(struct drm_device *dev,
1183 			    struct list_head *mode_list, bool verbose)
1184 {
1185 	struct drm_display_mode *mode, *t;
1186 
1187 	list_for_each_entry_safe(mode, t, mode_list, head) {
1188 		if (mode->status != MODE_OK) {
1189 			list_del(&mode->head);
1190 			if (verbose) {
1191 				drm_mode_debug_printmodeline(mode);
1192 				DRM_DEBUG_KMS("Not using %s mode: %s\n",
1193 					      mode->name,
1194 					      drm_get_mode_status_name(mode->status));
1195 			}
1196 			drm_mode_destroy(dev, mode);
1197 		}
1198 	}
1199 }
1200 EXPORT_SYMBOL(drm_mode_prune_invalid);
1201 
1202 /**
1203  * drm_mode_compare - compare modes for favorability
1204  * @priv: unused
1205  * @lh_a: list_head for first mode
1206  * @lh_b: list_head for second mode
1207  *
1208  * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
1209  * which is better.
1210  *
1211  * Returns:
1212  * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
1213  * positive if @lh_b is better than @lh_a.
1214  */
1215 static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
1216 {
1217 	struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
1218 	struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
1219 	int diff;
1220 
1221 	diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
1222 		((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
1223 	if (diff)
1224 		return diff;
1225 	diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
1226 	if (diff)
1227 		return diff;
1228 
1229 	diff = b->vrefresh - a->vrefresh;
1230 	if (diff)
1231 		return diff;
1232 
1233 	diff = b->clock - a->clock;
1234 	return diff;
1235 }
1236 
1237 /**
1238  * drm_mode_sort - sort mode list
1239  * @mode_list: list of drm_display_mode structures to sort
1240  *
1241  * Sort @mode_list by favorability, moving good modes to the head of the list.
1242  */
1243 void drm_mode_sort(struct list_head *mode_list)
1244 {
1245 	list_sort(NULL, mode_list, drm_mode_compare);
1246 }
1247 EXPORT_SYMBOL(drm_mode_sort);
1248 
1249 /**
1250  * drm_mode_connector_list_update - update the mode list for the connector
1251  * @connector: the connector to update
1252  *
1253  * This moves the modes from the @connector probed_modes list
1254  * to the actual mode list. It compares the probed mode against the current
1255  * list and only adds different/new modes.
1256  *
1257  * This is just a helper functions doesn't validate any modes itself and also
1258  * doesn't prune any invalid modes. Callers need to do that themselves.
1259  */
1260 void drm_mode_connector_list_update(struct drm_connector *connector)
1261 {
1262 	struct drm_display_mode *pmode, *pt;
1263 
1264 	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1265 
1266 	list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
1267 		struct drm_display_mode *mode;
1268 		bool found_it = false;
1269 
1270 		/* go through current modes checking for the new probed mode */
1271 		list_for_each_entry(mode, &connector->modes, head) {
1272 			if (!drm_mode_equal(pmode, mode))
1273 				continue;
1274 
1275 			found_it = true;
1276 
1277 			/*
1278 			 * If the old matching mode is stale (ie. left over
1279 			 * from a previous probe) just replace it outright.
1280 			 * Otherwise just merge the type bits between all
1281 			 * equal probed modes.
1282 			 *
1283 			 * If two probed modes are considered equal, pick the
1284 			 * actual timings from the one that's marked as
1285 			 * preferred (in case the match isn't 100%). If
1286 			 * multiple or zero preferred modes are present, favor
1287 			 * the mode added to the probed_modes list first.
1288 			 */
1289 			if (mode->status == MODE_STALE) {
1290 				drm_mode_copy(mode, pmode);
1291 			} else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
1292 				   (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
1293 				pmode->type |= mode->type;
1294 				drm_mode_copy(mode, pmode);
1295 			} else {
1296 				mode->type |= pmode->type;
1297 			}
1298 
1299 			list_del(&pmode->head);
1300 			drm_mode_destroy(connector->dev, pmode);
1301 			break;
1302 		}
1303 
1304 		if (!found_it) {
1305 			list_move_tail(&pmode->head, &connector->modes);
1306 		}
1307 	}
1308 }
1309 EXPORT_SYMBOL(drm_mode_connector_list_update);
1310 
1311 /**
1312  * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
1313  * @mode_option: optional per connector mode option
1314  * @connector: connector to parse modeline for
1315  * @mode: preallocated drm_cmdline_mode structure to fill out
1316  *
1317  * This parses @mode_option command line modeline for modes and options to
1318  * configure the connector. If @mode_option is NULL the default command line
1319  * modeline in fb_mode_option will be parsed instead.
1320  *
1321  * This uses the same parameters as the fb modedb.c, except for an extra
1322  * force-enable, force-enable-digital and force-disable bit at the end:
1323  *
1324  * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1325  *
1326  * The intermediate drm_cmdline_mode structure is required to store additional
1327  * options from the command line modline like the force-enable/disable flag.
1328  *
1329  * Returns:
1330  * True if a valid modeline has been parsed, false otherwise.
1331  */
1332 bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1333 					       struct drm_connector *connector,
1334 					       struct drm_cmdline_mode *mode)
1335 {
1336 	const char *name;
1337 	unsigned int namelen;
1338 	bool res_specified = false, bpp_specified = false, refresh_specified = false;
1339 	unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
1340 	bool yres_specified = false, cvt = false, rb = false;
1341 	bool interlace = false, margins = false, was_digit = false;
1342 	int i;
1343 	enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
1344 
1345 #ifdef CONFIG_FB
1346 	if (!mode_option)
1347 		mode_option = fb_mode_option;
1348 #endif
1349 
1350 	if (!mode_option) {
1351 		mode->specified = false;
1352 		return false;
1353 	}
1354 
1355 	name = mode_option;
1356 	namelen = strlen(name);
1357 	for (i = namelen-1; i >= 0; i--) {
1358 		switch (name[i]) {
1359 		case '@':
1360 			if (!refresh_specified && !bpp_specified &&
1361 			    !yres_specified && !cvt && !rb && was_digit) {
1362 				refresh = simple_strtol(&name[i+1], NULL, 10);
1363 				refresh_specified = true;
1364 				was_digit = false;
1365 			} else
1366 				goto done;
1367 			break;
1368 		case '-':
1369 			if (!bpp_specified && !yres_specified && !cvt &&
1370 			    !rb && was_digit) {
1371 				bpp = simple_strtol(&name[i+1], NULL, 10);
1372 				bpp_specified = true;
1373 				was_digit = false;
1374 			} else
1375 				goto done;
1376 			break;
1377 		case 'x':
1378 			if (!yres_specified && was_digit) {
1379 				yres = simple_strtol(&name[i+1], NULL, 10);
1380 				yres_specified = true;
1381 				was_digit = false;
1382 			} else
1383 				goto done;
1384 			break;
1385 		case '0' ... '9':
1386 			was_digit = true;
1387 			break;
1388 		case 'M':
1389 			if (yres_specified || cvt || was_digit)
1390 				goto done;
1391 			cvt = true;
1392 			break;
1393 		case 'R':
1394 			if (yres_specified || cvt || rb || was_digit)
1395 				goto done;
1396 			rb = true;
1397 			break;
1398 		case 'm':
1399 			if (cvt || yres_specified || was_digit)
1400 				goto done;
1401 			margins = true;
1402 			break;
1403 		case 'i':
1404 			if (cvt || yres_specified || was_digit)
1405 				goto done;
1406 			interlace = true;
1407 			break;
1408 		case 'e':
1409 			if (yres_specified || bpp_specified || refresh_specified ||
1410 			    was_digit || (force != DRM_FORCE_UNSPECIFIED))
1411 				goto done;
1412 
1413 			force = DRM_FORCE_ON;
1414 			break;
1415 		case 'D':
1416 			if (yres_specified || bpp_specified || refresh_specified ||
1417 			    was_digit || (force != DRM_FORCE_UNSPECIFIED))
1418 				goto done;
1419 
1420 			if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1421 			    (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1422 				force = DRM_FORCE_ON;
1423 			else
1424 				force = DRM_FORCE_ON_DIGITAL;
1425 			break;
1426 		case 'd':
1427 			if (yres_specified || bpp_specified || refresh_specified ||
1428 			    was_digit || (force != DRM_FORCE_UNSPECIFIED))
1429 				goto done;
1430 
1431 			force = DRM_FORCE_OFF;
1432 			break;
1433 		default:
1434 			goto done;
1435 		}
1436 	}
1437 
1438 	if (i < 0 && yres_specified) {
1439 		char *ch;
1440 		xres = simple_strtol(name, &ch, 10);
1441 		if ((ch != NULL) && (*ch == 'x'))
1442 			res_specified = true;
1443 		else
1444 			i = ch - name;
1445 	} else if (!yres_specified && was_digit) {
1446 		/* catch mode that begins with digits but has no 'x' */
1447 		i = 0;
1448 	}
1449 done:
1450 	if (i >= 0) {
1451 		pr_warn("[drm] parse error at position %i in video mode '%s'\n",
1452 			i, name);
1453 		mode->specified = false;
1454 		return false;
1455 	}
1456 
1457 	if (res_specified) {
1458 		mode->specified = true;
1459 		mode->xres = xres;
1460 		mode->yres = yres;
1461 	}
1462 
1463 	if (refresh_specified) {
1464 		mode->refresh_specified = true;
1465 		mode->refresh = refresh;
1466 	}
1467 
1468 	if (bpp_specified) {
1469 		mode->bpp_specified = true;
1470 		mode->bpp = bpp;
1471 	}
1472 	mode->rb = rb;
1473 	mode->cvt = cvt;
1474 	mode->interlace = interlace;
1475 	mode->margins = margins;
1476 	mode->force = force;
1477 
1478 	return true;
1479 }
1480 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1481 
1482 /**
1483  * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
1484  * @dev: DRM device to create the new mode for
1485  * @cmd: input command line modeline
1486  *
1487  * Returns:
1488  * Pointer to converted mode on success, NULL on error.
1489  */
1490 struct drm_display_mode *
1491 drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1492 				  struct drm_cmdline_mode *cmd)
1493 {
1494 	struct drm_display_mode *mode;
1495 
1496 	if (cmd->cvt)
1497 		mode = drm_cvt_mode(dev,
1498 				    cmd->xres, cmd->yres,
1499 				    cmd->refresh_specified ? cmd->refresh : 60,
1500 				    cmd->rb, cmd->interlace,
1501 				    cmd->margins);
1502 	else
1503 		mode = drm_gtf_mode(dev,
1504 				    cmd->xres, cmd->yres,
1505 				    cmd->refresh_specified ? cmd->refresh : 60,
1506 				    cmd->interlace,
1507 				    cmd->margins);
1508 	if (!mode)
1509 		return NULL;
1510 
1511 	mode->type |= DRM_MODE_TYPE_USERDEF;
1512 	/* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
1513 	if (cmd->xres == 1366)
1514 		drm_mode_fixup_1366x768(mode);
1515 	drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1516 	return mode;
1517 }
1518 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
1519 
1520 /**
1521  * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo
1522  * @out: drm_mode_modeinfo struct to return to the user
1523  * @in: drm_display_mode to use
1524  *
1525  * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
1526  * the user.
1527  */
1528 void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
1529 			       const struct drm_display_mode *in)
1530 {
1531 	WARN(in->hdisplay > USHRT_MAX || in->hsync_start > USHRT_MAX ||
1532 	     in->hsync_end > USHRT_MAX || in->htotal > USHRT_MAX ||
1533 	     in->hskew > USHRT_MAX || in->vdisplay > USHRT_MAX ||
1534 	     in->vsync_start > USHRT_MAX || in->vsync_end > USHRT_MAX ||
1535 	     in->vtotal > USHRT_MAX || in->vscan > USHRT_MAX,
1536 	     "timing values too large for mode info\n");
1537 
1538 	out->clock = in->clock;
1539 	out->hdisplay = in->hdisplay;
1540 	out->hsync_start = in->hsync_start;
1541 	out->hsync_end = in->hsync_end;
1542 	out->htotal = in->htotal;
1543 	out->hskew = in->hskew;
1544 	out->vdisplay = in->vdisplay;
1545 	out->vsync_start = in->vsync_start;
1546 	out->vsync_end = in->vsync_end;
1547 	out->vtotal = in->vtotal;
1548 	out->vscan = in->vscan;
1549 	out->vrefresh = in->vrefresh;
1550 	out->flags = in->flags;
1551 	out->type = in->type;
1552 	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1553 	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1554 }
1555 
1556 /**
1557  * drm_crtc_convert_umode - convert a modeinfo into a drm_display_mode
1558  * @out: drm_display_mode to return to the user
1559  * @in: drm_mode_modeinfo to use
1560  *
1561  * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
1562  * the caller.
1563  *
1564  * Returns:
1565  * Zero on success, negative errno on failure.
1566  */
1567 int drm_mode_convert_umode(struct drm_display_mode *out,
1568 			   const struct drm_mode_modeinfo *in)
1569 {
1570 	int ret = -EINVAL;
1571 
1572 	if (in->clock > INT_MAX || in->vrefresh > INT_MAX) {
1573 		ret = -ERANGE;
1574 		goto out;
1575 	}
1576 
1577 	if ((in->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
1578 		goto out;
1579 
1580 	out->clock = in->clock;
1581 	out->hdisplay = in->hdisplay;
1582 	out->hsync_start = in->hsync_start;
1583 	out->hsync_end = in->hsync_end;
1584 	out->htotal = in->htotal;
1585 	out->hskew = in->hskew;
1586 	out->vdisplay = in->vdisplay;
1587 	out->vsync_start = in->vsync_start;
1588 	out->vsync_end = in->vsync_end;
1589 	out->vtotal = in->vtotal;
1590 	out->vscan = in->vscan;
1591 	out->vrefresh = in->vrefresh;
1592 	out->flags = in->flags;
1593 	out->type = in->type;
1594 	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
1595 	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
1596 
1597 	out->status = drm_mode_validate_basic(out);
1598 	if (out->status != MODE_OK)
1599 		goto out;
1600 
1601 	drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
1602 
1603 	ret = 0;
1604 
1605 out:
1606 	return ret;
1607 }
1608 
1609 /**
1610  * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
1611  * output format
1612  *
1613  * @display: display under action
1614  * @mode: video mode to be tested.
1615  *
1616  * Returns:
1617  * true if the mode can be supported in YCBCR420 format
1618  * false if not.
1619  */
1620 bool drm_mode_is_420_only(const struct drm_display_info *display,
1621 			  const struct drm_display_mode *mode)
1622 {
1623 	u8 vic = drm_match_cea_mode(mode);
1624 
1625 	return test_bit(vic, display->hdmi.y420_vdb_modes);
1626 }
1627 EXPORT_SYMBOL(drm_mode_is_420_only);
1628 
1629 /**
1630  * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
1631  * output format also (along with RGB/YCBCR444/422)
1632  *
1633  * @display: display under action.
1634  * @mode: video mode to be tested.
1635  *
1636  * Returns:
1637  * true if the mode can be support YCBCR420 format
1638  * false if not.
1639  */
1640 bool drm_mode_is_420_also(const struct drm_display_info *display,
1641 			  const struct drm_display_mode *mode)
1642 {
1643 	u8 vic = drm_match_cea_mode(mode);
1644 
1645 	return test_bit(vic, display->hdmi.y420_cmdb_modes);
1646 }
1647 EXPORT_SYMBOL(drm_mode_is_420_also);
1648 /**
1649  * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
1650  * output format
1651  *
1652  * @display: display under action.
1653  * @mode: video mode to be tested.
1654  *
1655  * Returns:
1656  * true if the mode can be supported in YCBCR420 format
1657  * false if not.
1658  */
1659 bool drm_mode_is_420(const struct drm_display_info *display,
1660 		     const struct drm_display_mode *mode)
1661 {
1662 	return drm_mode_is_420_only(display, mode) ||
1663 		drm_mode_is_420_also(display, mode);
1664 }
1665 EXPORT_SYMBOL(drm_mode_is_420);
1666