xref: /dragonfly/sys/dev/drm/drm_modes.c (revision 31524921)
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 <drm/drm_modes.h>
39 
40 #include "drm_crtc_internal.h"
41 
42 /**
43  * drm_mode_debug_printmodeline - print a mode to dmesg
44  * @mode: mode to print
45  *
46  * Describe @mode using DRM_DEBUG.
47  */
48 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
49 {
50 	DRM_DEBUG_KMS("Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d "
51 			"0x%x 0x%x\n",
52 		mode->base.id, mode->name, mode->vrefresh, mode->clock,
53 		mode->hdisplay, mode->hsync_start,
54 		mode->hsync_end, mode->htotal,
55 		mode->vdisplay, mode->vsync_start,
56 		mode->vsync_end, mode->vtotal, mode->type, mode->flags);
57 }
58 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
59 
60 /**
61  * drm_mode_create - create a new display mode
62  * @dev: DRM device
63  *
64  * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
65  * and return it.
66  *
67  * Returns:
68  * Pointer to new mode on success, NULL on error.
69  */
70 struct drm_display_mode *drm_mode_create(struct drm_device *dev)
71 {
72 	struct drm_display_mode *nmode;
73 
74 	nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
75 	if (!nmode)
76 		return NULL;
77 
78 	if (drm_mode_object_get(dev, &nmode->base, DRM_MODE_OBJECT_MODE)) {
79 		kfree(nmode);
80 		return NULL;
81 	}
82 
83 	return nmode;
84 }
85 EXPORT_SYMBOL(drm_mode_create);
86 
87 /**
88  * drm_mode_destroy - remove a mode
89  * @dev: DRM device
90  * @mode: mode to remove
91  *
92  * Release @mode's unique ID, then free it @mode structure itself using kfree.
93  */
94 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
95 {
96 	if (!mode)
97 		return;
98 
99 	drm_mode_object_put(dev, &mode->base);
100 
101 	kfree(mode);
102 }
103 EXPORT_SYMBOL(drm_mode_destroy);
104 
105 /**
106  * drm_mode_probed_add - add a mode to a connector's probed_mode list
107  * @connector: connector the new mode
108  * @mode: mode data
109  *
110  * Add @mode to @connector's probed_mode list for later use. This list should
111  * then in a second step get filtered and all the modes actually supported by
112  * the hardware moved to the @connector's modes list.
113  */
114 void drm_mode_probed_add(struct drm_connector *connector,
115 			 struct drm_display_mode *mode)
116 {
117 	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
118 
119 	list_add_tail(&mode->head, &connector->probed_modes);
120 }
121 EXPORT_SYMBOL(drm_mode_probed_add);
122 
123 /**
124  * drm_cvt_mode -create a modeline based on the CVT algorithm
125  * @dev: drm device
126  * @hdisplay: hdisplay size
127  * @vdisplay: vdisplay size
128  * @vrefresh: vrefresh rate
129  * @reduced: whether to use reduced blanking
130  * @interlaced: whether to compute an interlaced mode
131  * @margins: whether to add margins (borders)
132  *
133  * This function is called to generate the modeline based on CVT algorithm
134  * according to the hdisplay, vdisplay, vrefresh.
135  * It is based from the VESA(TM) Coordinated Video Timing Generator by
136  * Graham Loveridge April 9, 2003 available at
137  * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
138  *
139  * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
140  * What I have done is to translate it by using integer calculation.
141  *
142  * Returns:
143  * The modeline based on the CVT algorithm stored in a drm_display_mode object.
144  * The display mode object is allocated with drm_mode_create(). Returns NULL
145  * when no mode could be allocated.
146  */
147 struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
148 				      int vdisplay, int vrefresh,
149 				      bool reduced, bool interlaced, bool margins)
150 {
151 #define HV_FACTOR			1000
152 	/* 1) top/bottom margin size (% of height) - default: 1.8, */
153 #define	CVT_MARGIN_PERCENTAGE		18
154 	/* 2) character cell horizontal granularity (pixels) - default 8 */
155 #define	CVT_H_GRANULARITY		8
156 	/* 3) Minimum vertical porch (lines) - default 3 */
157 #define	CVT_MIN_V_PORCH			3
158 	/* 4) Minimum number of vertical back porch lines - default 6 */
159 #define	CVT_MIN_V_BPORCH		6
160 	/* Pixel Clock step (kHz) */
161 #define CVT_CLOCK_STEP			250
162 	struct drm_display_mode *drm_mode;
163 	unsigned int vfieldrate, hperiod;
164 	int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
165 	int interlace;
166 
167 	/* allocate the drm_display_mode structure. If failure, we will
168 	 * return directly
169 	 */
170 	drm_mode = drm_mode_create(dev);
171 	if (!drm_mode)
172 		return NULL;
173 
174 	/* the CVT default refresh rate is 60Hz */
175 	if (!vrefresh)
176 		vrefresh = 60;
177 
178 	/* the required field fresh rate */
179 	if (interlaced)
180 		vfieldrate = vrefresh * 2;
181 	else
182 		vfieldrate = vrefresh;
183 
184 	/* horizontal pixels */
185 	hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
186 
187 	/* determine the left&right borders */
188 	hmargin = 0;
189 	if (margins) {
190 		hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
191 		hmargin -= hmargin % CVT_H_GRANULARITY;
192 	}
193 	/* find the total active pixels */
194 	drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
195 
196 	/* find the number of lines per field */
197 	if (interlaced)
198 		vdisplay_rnd = vdisplay / 2;
199 	else
200 		vdisplay_rnd = vdisplay;
201 
202 	/* find the top & bottom borders */
203 	vmargin = 0;
204 	if (margins)
205 		vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
206 
207 	drm_mode->vdisplay = vdisplay + 2 * vmargin;
208 
209 	/* Interlaced */
210 	if (interlaced)
211 		interlace = 1;
212 	else
213 		interlace = 0;
214 
215 	/* Determine VSync Width from aspect ratio */
216 	if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
217 		vsync = 4;
218 	else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
219 		vsync = 5;
220 	else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
221 		vsync = 6;
222 	else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
223 		vsync = 7;
224 	else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
225 		vsync = 7;
226 	else /* custom */
227 		vsync = 10;
228 
229 	if (!reduced) {
230 		/* simplify the GTF calculation */
231 		/* 4) Minimum time of vertical sync + back porch interval (µs)
232 		 * default 550.0
233 		 */
234 		int tmp1, tmp2;
235 #define CVT_MIN_VSYNC_BP	550
236 		/* 3) Nominal HSync width (% of line period) - default 8 */
237 #define CVT_HSYNC_PERCENTAGE	8
238 		unsigned int hblank_percentage;
239 		int vsyncandback_porch, vback_porch, hblank;
240 
241 		/* estimated the horizontal period */
242 		tmp1 = HV_FACTOR * 1000000  -
243 				CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
244 		tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
245 				interlace;
246 		hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
247 
248 		tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
249 		/* 9. Find number of lines in sync + backporch */
250 		if (tmp1 < (vsync + CVT_MIN_V_PORCH))
251 			vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
252 		else
253 			vsyncandback_porch = tmp1;
254 		/* 10. Find number of lines in back porch */
255 		vback_porch = vsyncandback_porch - vsync;
256 		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
257 				vsyncandback_porch + CVT_MIN_V_PORCH;
258 		/* 5) Definition of Horizontal blanking time limitation */
259 		/* Gradient (%/kHz) - default 600 */
260 #define CVT_M_FACTOR	600
261 		/* Offset (%) - default 40 */
262 #define CVT_C_FACTOR	40
263 		/* Blanking time scaling factor - default 128 */
264 #define CVT_K_FACTOR	128
265 		/* Scaling factor weighting - default 20 */
266 #define CVT_J_FACTOR	20
267 #define CVT_M_PRIME	(CVT_M_FACTOR * CVT_K_FACTOR / 256)
268 #define CVT_C_PRIME	((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
269 			 CVT_J_FACTOR)
270 		/* 12. Find ideal blanking duty cycle from formula */
271 		hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
272 					hperiod / 1000;
273 		/* 13. Blanking time */
274 		if (hblank_percentage < 20 * HV_FACTOR)
275 			hblank_percentage = 20 * HV_FACTOR;
276 		hblank = drm_mode->hdisplay * hblank_percentage /
277 			 (100 * HV_FACTOR - hblank_percentage);
278 		hblank -= hblank % (2 * CVT_H_GRANULARITY);
279 		/* 14. find the total pixes per line */
280 		drm_mode->htotal = drm_mode->hdisplay + hblank;
281 		drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
282 		drm_mode->hsync_start = drm_mode->hsync_end -
283 			(drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
284 		drm_mode->hsync_start += CVT_H_GRANULARITY -
285 			drm_mode->hsync_start % CVT_H_GRANULARITY;
286 		/* fill the Vsync values */
287 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
288 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
289 	} else {
290 		/* Reduced blanking */
291 		/* Minimum vertical blanking interval time (µs)- default 460 */
292 #define CVT_RB_MIN_VBLANK	460
293 		/* Fixed number of clocks for horizontal sync */
294 #define CVT_RB_H_SYNC		32
295 		/* Fixed number of clocks for horizontal blanking */
296 #define CVT_RB_H_BLANK		160
297 		/* Fixed number of lines for vertical front porch - default 3*/
298 #define CVT_RB_VFPORCH		3
299 		int vbilines;
300 		int tmp1, tmp2;
301 		/* 8. Estimate Horizontal period. */
302 		tmp1 = HV_FACTOR * 1000000 -
303 			CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
304 		tmp2 = vdisplay_rnd + 2 * vmargin;
305 		hperiod = tmp1 / (tmp2 * vfieldrate);
306 		/* 9. Find number of lines in vertical blanking */
307 		vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
308 		/* 10. Check if vertical blanking is sufficient */
309 		if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
310 			vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
311 		/* 11. Find total number of lines in vertical field */
312 		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
313 		/* 12. Find total number of pixels in a line */
314 		drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
315 		/* Fill in HSync values */
316 		drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
317 		drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
318 		/* Fill in VSync values */
319 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
320 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
321 	}
322 	/* 15/13. Find pixel clock frequency (kHz for xf86) */
323 	drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;
324 	drm_mode->clock -= drm_mode->clock % CVT_CLOCK_STEP;
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  *	GTF Spreadsheet by Andy Morrish (1/5/97)
546  *	available at http://www.vesa.org
547  *
548  * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
549  * What I have done is to translate it by using integer calculation.
550  * I also refer to the function of fb_get_mode in the file of
551  * drivers/video/fbmon.c
552  *
553  * Standard GTF parameters:
554  * M = 600
555  * C = 40
556  * K = 128
557  * J = 20
558  *
559  * Returns:
560  * The modeline based on the GTF algorithm stored in a drm_display_mode object.
561  * The display mode object is allocated with drm_mode_create(). Returns NULL
562  * when no mode could be allocated.
563  */
564 struct drm_display_mode *
565 drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
566 	     bool interlaced, int margins)
567 {
568 	return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
569 				    interlaced, margins,
570 				    600, 40 * 2, 128, 20 * 2);
571 }
572 EXPORT_SYMBOL(drm_gtf_mode);
573 
574 #ifdef CONFIG_VIDEOMODE_HELPERS
575 /**
576  * drm_display_mode_from_videomode - fill in @dmode using @vm,
577  * @vm: videomode structure to use as source
578  * @dmode: drm_display_mode structure to use as destination
579  *
580  * Fills out @dmode using the display mode specified in @vm.
581  */
582 void drm_display_mode_from_videomode(const struct videomode *vm,
583 				     struct drm_display_mode *dmode)
584 {
585 	dmode->hdisplay = vm->hactive;
586 	dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
587 	dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
588 	dmode->htotal = dmode->hsync_end + vm->hback_porch;
589 
590 	dmode->vdisplay = vm->vactive;
591 	dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
592 	dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
593 	dmode->vtotal = dmode->vsync_end + vm->vback_porch;
594 
595 	dmode->clock = vm->pixelclock / 1000;
596 
597 	dmode->flags = 0;
598 	if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
599 		dmode->flags |= DRM_MODE_FLAG_PHSYNC;
600 	else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
601 		dmode->flags |= DRM_MODE_FLAG_NHSYNC;
602 	if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
603 		dmode->flags |= DRM_MODE_FLAG_PVSYNC;
604 	else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
605 		dmode->flags |= DRM_MODE_FLAG_NVSYNC;
606 	if (vm->flags & DISPLAY_FLAGS_INTERLACED)
607 		dmode->flags |= DRM_MODE_FLAG_INTERLACE;
608 	if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
609 		dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
610 	if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
611 		dmode->flags |= DRM_MODE_FLAG_DBLCLK;
612 	drm_mode_set_name(dmode);
613 }
614 
615 #ifdef CONFIG_OF
616 /**
617  * of_get_drm_display_mode - get a drm_display_mode from devicetree
618  * @np: device_node with the timing specification
619  * @dmode: will be set to the return value
620  * @index: index into the list of display timings in devicetree
621  *
622  * This function is expensive and should only be used, if only one mode is to be
623  * read from DT. To get multiple modes start with of_get_display_timings and
624  * work with that instead.
625  *
626  * Returns:
627  * 0 on success, a negative errno code when no of videomode node was found.
628  */
629 int of_get_drm_display_mode(struct device_node *np,
630 			    struct drm_display_mode *dmode, int index)
631 {
632 	struct videomode vm;
633 	int ret;
634 
635 	ret = of_get_videomode(np, &vm, index);
636 	if (ret)
637 		return ret;
638 
639 	drm_display_mode_from_videomode(&vm, dmode);
640 
641 	pr_debug("%s: got %dx%d display mode from %s\n",
642 		of_node_full_name(np), vm.hactive, vm.vactive, np->name);
643 	drm_mode_debug_printmodeline(dmode);
644 
645 	return 0;
646 }
647 #endif /* CONFIG_OF */
648 #endif /* CONFIG_VIDEOMODE_HELPERS */
649 
650 /**
651  * drm_mode_set_name - set the name on a mode
652  * @mode: name will be set in this mode
653  *
654  * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
655  * with an optional 'i' suffix for interlaced modes.
656  */
657 void drm_mode_set_name(struct drm_display_mode *mode)
658 {
659 	bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
660 
661 	ksnprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
662 		 mode->hdisplay, mode->vdisplay,
663 		 interlaced ? "i" : "");
664 }
665 EXPORT_SYMBOL(drm_mode_set_name);
666 
667 /** drm_mode_hsync - get the hsync of a mode
668  * @mode: mode
669  *
670  * Returns:
671  * @modes's hsync rate in kHz, rounded to the nearest integer. Calculates the
672  * value first if it is not yet set.
673  */
674 int drm_mode_hsync(const struct drm_display_mode *mode)
675 {
676 	unsigned int calc_val;
677 
678 	if (mode->hsync)
679 		return mode->hsync;
680 
681 	if (mode->htotal < 0)
682 		return 0;
683 
684 	calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
685 	calc_val += 500;				/* round to 1000Hz */
686 	calc_val /= 1000;				/* truncate to kHz */
687 
688 	return calc_val;
689 }
690 EXPORT_SYMBOL(drm_mode_hsync);
691 
692 /**
693  * drm_mode_vrefresh - get the vrefresh of a mode
694  * @mode: mode
695  *
696  * Returns:
697  * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
698  * value first if it is not yet set.
699  */
700 int drm_mode_vrefresh(const struct drm_display_mode *mode)
701 {
702 	int refresh = 0;
703 	unsigned int calc_val;
704 
705 	if (mode->vrefresh > 0)
706 		refresh = mode->vrefresh;
707 	else if (mode->htotal > 0 && mode->vtotal > 0) {
708 		int vtotal;
709 		vtotal = mode->vtotal;
710 		/* work out vrefresh the value will be x1000 */
711 		calc_val = (mode->clock * 1000);
712 		calc_val /= mode->htotal;
713 		refresh = (calc_val + vtotal / 2) / vtotal;
714 
715 		if (mode->flags & DRM_MODE_FLAG_INTERLACE)
716 			refresh *= 2;
717 		if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
718 			refresh /= 2;
719 		if (mode->vscan > 1)
720 			refresh /= mode->vscan;
721 	}
722 	return refresh;
723 }
724 EXPORT_SYMBOL(drm_mode_vrefresh);
725 
726 /**
727  * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
728  * @p: mode
729  * @adjust_flags: a combination of adjustment flags
730  *
731  * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
732  *
733  * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
734  *   interlaced modes.
735  * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
736  *   buffers containing two eyes (only adjust the timings when needed, eg. for
737  *   "frame packing" or "side by side full").
738  */
739 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
740 {
741 	if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
742 		return;
743 
744 	p->crtc_clock = p->clock;
745 	p->crtc_hdisplay = p->hdisplay;
746 	p->crtc_hsync_start = p->hsync_start;
747 	p->crtc_hsync_end = p->hsync_end;
748 	p->crtc_htotal = p->htotal;
749 	p->crtc_hskew = p->hskew;
750 	p->crtc_vdisplay = p->vdisplay;
751 	p->crtc_vsync_start = p->vsync_start;
752 	p->crtc_vsync_end = p->vsync_end;
753 	p->crtc_vtotal = p->vtotal;
754 
755 	if (p->flags & DRM_MODE_FLAG_INTERLACE) {
756 		if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
757 			p->crtc_vdisplay /= 2;
758 			p->crtc_vsync_start /= 2;
759 			p->crtc_vsync_end /= 2;
760 			p->crtc_vtotal /= 2;
761 		}
762 	}
763 
764 	if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
765 		p->crtc_vdisplay *= 2;
766 		p->crtc_vsync_start *= 2;
767 		p->crtc_vsync_end *= 2;
768 		p->crtc_vtotal *= 2;
769 	}
770 
771 	if (p->vscan > 1) {
772 		p->crtc_vdisplay *= p->vscan;
773 		p->crtc_vsync_start *= p->vscan;
774 		p->crtc_vsync_end *= p->vscan;
775 		p->crtc_vtotal *= p->vscan;
776 	}
777 
778 	if (adjust_flags & CRTC_STEREO_DOUBLE) {
779 		unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
780 
781 		switch (layout) {
782 		case DRM_MODE_FLAG_3D_FRAME_PACKING:
783 			p->crtc_clock *= 2;
784 			p->crtc_vdisplay += p->crtc_vtotal;
785 			p->crtc_vsync_start += p->crtc_vtotal;
786 			p->crtc_vsync_end += p->crtc_vtotal;
787 			p->crtc_vtotal += p->crtc_vtotal;
788 			break;
789 		}
790 	}
791 
792 	p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
793 	p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
794 	p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
795 	p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
796 }
797 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
798 
799 /**
800  * drm_mode_copy - copy the mode
801  * @dst: mode to overwrite
802  * @src: mode to copy
803  *
804  * Copy an existing mode into another mode, preserving the object id and
805  * list head of the destination mode.
806  */
807 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
808 {
809 	int id = dst->base.id;
810 	struct list_head head = dst->head;
811 
812 	*dst = *src;
813 	dst->base.id = id;
814 	dst->head = head;
815 }
816 EXPORT_SYMBOL(drm_mode_copy);
817 
818 /**
819  * drm_mode_duplicate - allocate and duplicate an existing mode
820  * @dev: drm_device to allocate the duplicated mode for
821  * @mode: mode to duplicate
822  *
823  * Just allocate a new mode, copy the existing mode into it, and return
824  * a pointer to it.  Used to create new instances of established modes.
825  *
826  * Returns:
827  * Pointer to duplicated mode on success, NULL on error.
828  */
829 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
830 					    const struct drm_display_mode *mode)
831 {
832 	struct drm_display_mode *nmode;
833 
834 	nmode = drm_mode_create(dev);
835 	if (!nmode)
836 		return NULL;
837 
838 	drm_mode_copy(nmode, mode);
839 
840 	return nmode;
841 }
842 EXPORT_SYMBOL(drm_mode_duplicate);
843 
844 /**
845  * drm_mode_equal - test modes for equality
846  * @mode1: first mode
847  * @mode2: second mode
848  *
849  * Check to see if @mode1 and @mode2 are equivalent.
850  *
851  * Returns:
852  * True if the modes are equal, false otherwise.
853  */
854 bool drm_mode_equal(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
855 {
856 	/* do clock check convert to PICOS so fb modes get matched
857 	 * the same */
858 	if (mode1->clock && mode2->clock) {
859 		if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
860 			return false;
861 	} else if (mode1->clock != mode2->clock)
862 		return false;
863 
864 	if ((mode1->flags & DRM_MODE_FLAG_3D_MASK) !=
865 	    (mode2->flags & DRM_MODE_FLAG_3D_MASK))
866 		return false;
867 
868 	return drm_mode_equal_no_clocks_no_stereo(mode1, mode2);
869 }
870 EXPORT_SYMBOL(drm_mode_equal);
871 
872 /**
873  * drm_mode_equal_no_clocks_no_stereo - test modes for equality
874  * @mode1: first mode
875  * @mode2: second mode
876  *
877  * Check to see if @mode1 and @mode2 are equivalent, but
878  * don't check the pixel clocks nor the stereo layout.
879  *
880  * Returns:
881  * True if the modes are equal, false otherwise.
882  */
883 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
884 					const struct drm_display_mode *mode2)
885 {
886 	if (mode1->hdisplay == mode2->hdisplay &&
887 	    mode1->hsync_start == mode2->hsync_start &&
888 	    mode1->hsync_end == mode2->hsync_end &&
889 	    mode1->htotal == mode2->htotal &&
890 	    mode1->hskew == mode2->hskew &&
891 	    mode1->vdisplay == mode2->vdisplay &&
892 	    mode1->vsync_start == mode2->vsync_start &&
893 	    mode1->vsync_end == mode2->vsync_end &&
894 	    mode1->vtotal == mode2->vtotal &&
895 	    mode1->vscan == mode2->vscan &&
896 	    (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
897 	     (mode2->flags & ~DRM_MODE_FLAG_3D_MASK))
898 		return true;
899 
900 	return false;
901 }
902 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
903 
904 /**
905  * drm_mode_validate_size - make sure modes adhere to size constraints
906  * @dev: DRM device
907  * @mode_list: list of modes to check
908  * @maxX: maximum width
909  * @maxY: maximum height
910  *
911  * This function is a helper which can be used to validate modes against size
912  * limitations of the DRM device/connector. If a mode is too big its status
913  * memeber is updated with the appropriate validation failure code. The list
914  * itself is not changed.
915  */
916 void drm_mode_validate_size(struct drm_device *dev,
917 			    struct list_head *mode_list,
918 			    int maxX, int maxY)
919 {
920 	struct drm_display_mode *mode;
921 
922 	list_for_each_entry(mode, mode_list, head) {
923 		if (maxX > 0 && mode->hdisplay > maxX)
924 			mode->status = MODE_VIRTUAL_X;
925 
926 		if (maxY > 0 && mode->vdisplay > maxY)
927 			mode->status = MODE_VIRTUAL_Y;
928 	}
929 }
930 EXPORT_SYMBOL(drm_mode_validate_size);
931 
932 /**
933  * drm_mode_prune_invalid - remove invalid modes from mode list
934  * @dev: DRM device
935  * @mode_list: list of modes to check
936  * @verbose: be verbose about it
937  *
938  * This helper function can be used to prune a display mode list after
939  * validation has been completed. All modes who's status is not MODE_OK will be
940  * removed from the list, and if @verbose the status code and mode name is also
941  * printed to dmesg.
942  */
943 void drm_mode_prune_invalid(struct drm_device *dev,
944 			    struct list_head *mode_list, bool verbose)
945 {
946 	struct drm_display_mode *mode, *t;
947 
948 	list_for_each_entry_safe(mode, t, mode_list, head) {
949 		if (mode->status != MODE_OK) {
950 			list_del(&mode->head);
951 			if (verbose) {
952 				drm_mode_debug_printmodeline(mode);
953 				DRM_DEBUG_KMS("Not using %s mode %d\n",
954 					mode->name, mode->status);
955 			}
956 			drm_mode_destroy(dev, mode);
957 		}
958 	}
959 }
960 EXPORT_SYMBOL(drm_mode_prune_invalid);
961 
962 /**
963  * drm_mode_compare - compare modes for favorability
964  * @priv: unused
965  * @lh_a: list_head for first mode
966  * @lh_b: list_head for second mode
967  *
968  * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
969  * which is better.
970  *
971  * Returns:
972  * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
973  * positive if @lh_b is better than @lh_a.
974  */
975 static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
976 {
977 	struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
978 	struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
979 	int diff;
980 
981 	diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
982 		((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
983 	if (diff)
984 		return diff;
985 	diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
986 	if (diff)
987 		return diff;
988 
989 	diff = b->vrefresh - a->vrefresh;
990 	if (diff)
991 		return diff;
992 
993 	diff = b->clock - a->clock;
994 	return diff;
995 }
996 
997 /**
998  * drm_mode_sort - sort mode list
999  * @mode_list: list of drm_display_mode structures to sort
1000  *
1001  * Sort @mode_list by favorability, moving good modes to the head of the list.
1002  */
1003 void drm_mode_sort(struct list_head *mode_list)
1004 {
1005 	list_sort(NULL, mode_list, drm_mode_compare);
1006 }
1007 EXPORT_SYMBOL(drm_mode_sort);
1008 
1009 /**
1010  * drm_mode_connector_list_update - update the mode list for the connector
1011  * @connector: the connector to update
1012  * @merge_type_bits: whether to merge or overright type bits.
1013  *
1014  * This moves the modes from the @connector probed_modes list
1015  * to the actual mode list. It compares the probed mode against the current
1016  * list and only adds different/new modes.
1017  *
1018  * This is just a helper functions doesn't validate any modes itself and also
1019  * doesn't prune any invalid modes. Callers need to do that themselves.
1020  */
1021 void drm_mode_connector_list_update(struct drm_connector *connector,
1022 				    bool merge_type_bits)
1023 {
1024 	struct drm_display_mode *mode;
1025 	struct drm_display_mode *pmode, *pt;
1026 	int found_it;
1027 
1028 	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
1029 
1030 	list_for_each_entry_safe(pmode, pt, &connector->probed_modes,
1031 				 head) {
1032 		found_it = 0;
1033 		/* go through current modes checking for the new probed mode */
1034 		list_for_each_entry(mode, &connector->modes, head) {
1035 			if (drm_mode_equal(pmode, mode)) {
1036 				found_it = 1;
1037 				/* if equal delete the probed mode */
1038 				mode->status = pmode->status;
1039 				/* Merge type bits together */
1040 				if (merge_type_bits)
1041 					mode->type |= pmode->type;
1042 				else
1043 					mode->type = pmode->type;
1044 				list_del(&pmode->head);
1045 				drm_mode_destroy(connector->dev, pmode);
1046 				break;
1047 			}
1048 		}
1049 
1050 		if (!found_it) {
1051 			list_move_tail(&pmode->head, &connector->modes);
1052 		}
1053 	}
1054 }
1055 EXPORT_SYMBOL(drm_mode_connector_list_update);
1056 
1057 /**
1058  * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
1059  * @mode_option: optional per connector mode option
1060  * @connector: connector to parse modeline for
1061  * @mode: preallocated drm_cmdline_mode structure to fill out
1062  *
1063  * This parses @mode_option command line modeline for modes and options to
1064  * configure the connector. If @mode_option is NULL the default command line
1065  * modeline in fb_mode_option will be parsed instead.
1066  *
1067  * This uses the same parameters as the fb modedb.c, except for an extra
1068  * force-enable, force-enable-digital and force-disable bit at the end:
1069  *
1070  *	<xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
1071  *
1072  * The intermediate drm_cmdline_mode structure is required to store additional
1073  * options from the command line modline like the force-enabel/disable flag.
1074  *
1075  * Returns:
1076  * True if a valid modeline has been parsed, false otherwise.
1077  */
1078 bool drm_mode_parse_command_line_for_connector(const char *mode_option,
1079 					       struct drm_connector *connector,
1080 					       struct drm_cmdline_mode *mode)
1081 {
1082 	const char *name;
1083 	unsigned int namelen;
1084 	bool res_specified = false, bpp_specified = false, refresh_specified = false;
1085 	unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0;
1086 	bool yres_specified = false, cvt = false, rb = false;
1087 	bool interlace = false, margins = false, was_digit = false;
1088 	int i;
1089 	enum drm_connector_force force = DRM_FORCE_UNSPECIFIED;
1090 
1091 #ifdef CONFIG_FB
1092 	if (!mode_option)
1093 		mode_option = fb_mode_option;
1094 #endif
1095 
1096 	if (!mode_option) {
1097 		mode->specified = false;
1098 		return false;
1099 	}
1100 
1101 	name = mode_option;
1102 	namelen = strlen(name);
1103 	for (i = namelen-1; i >= 0; i--) {
1104 		switch (name[i]) {
1105 		case '@':
1106 			if (!refresh_specified && !bpp_specified &&
1107 			    !yres_specified && !cvt && !rb && was_digit) {
1108 				refresh = simple_strtol(&name[i+1], NULL, 10);
1109 				refresh_specified = true;
1110 				was_digit = false;
1111 			} else
1112 				goto done;
1113 			break;
1114 		case '-':
1115 			if (!bpp_specified && !yres_specified && !cvt &&
1116 			    !rb && was_digit) {
1117 				bpp = simple_strtol(&name[i+1], NULL, 10);
1118 				bpp_specified = true;
1119 				was_digit = false;
1120 			} else
1121 				goto done;
1122 			break;
1123 		case 'x':
1124 			if (!yres_specified && was_digit) {
1125 				yres = simple_strtol(&name[i+1], NULL, 10);
1126 				yres_specified = true;
1127 				was_digit = false;
1128 			} else
1129 				goto done;
1130 			break;
1131 		case '0' ... '9':
1132 			was_digit = true;
1133 			break;
1134 		case 'M':
1135 			if (yres_specified || cvt || was_digit)
1136 				goto done;
1137 			cvt = true;
1138 			break;
1139 		case 'R':
1140 			if (yres_specified || cvt || rb || was_digit)
1141 				goto done;
1142 			rb = true;
1143 			break;
1144 		case 'm':
1145 			if (cvt || yres_specified || was_digit)
1146 				goto done;
1147 			margins = true;
1148 			break;
1149 		case 'i':
1150 			if (cvt || yres_specified || was_digit)
1151 				goto done;
1152 			interlace = true;
1153 			break;
1154 		case 'e':
1155 			if (yres_specified || bpp_specified || refresh_specified ||
1156 			    was_digit || (force != DRM_FORCE_UNSPECIFIED))
1157 				goto done;
1158 
1159 			force = DRM_FORCE_ON;
1160 			break;
1161 		case 'D':
1162 			if (yres_specified || bpp_specified || refresh_specified ||
1163 			    was_digit || (force != DRM_FORCE_UNSPECIFIED))
1164 				goto done;
1165 
1166 			if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
1167 			    (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
1168 				force = DRM_FORCE_ON;
1169 			else
1170 				force = DRM_FORCE_ON_DIGITAL;
1171 			break;
1172 		case 'd':
1173 			if (yres_specified || bpp_specified || refresh_specified ||
1174 			    was_digit || (force != DRM_FORCE_UNSPECIFIED))
1175 				goto done;
1176 
1177 			force = DRM_FORCE_OFF;
1178 			break;
1179 		default:
1180 			goto done;
1181 		}
1182 	}
1183 
1184 	if (i < 0 && yres_specified) {
1185 		char *ch;
1186 		xres = simple_strtol(name, &ch, 10);
1187 		if ((ch != NULL) && (*ch == 'x'))
1188 			res_specified = true;
1189 		else
1190 			i = ch - name;
1191 	} else if (!yres_specified && was_digit) {
1192 		/* catch mode that begins with digits but has no 'x' */
1193 		i = 0;
1194 	}
1195 done:
1196 	if (i >= 0) {
1197 		printk(KERN_WARNING
1198 			"parse error at position %i in video mode '%s'\n",
1199 			i, name);
1200 		mode->specified = false;
1201 		return false;
1202 	}
1203 
1204 	if (res_specified) {
1205 		mode->specified = true;
1206 		mode->xres = xres;
1207 		mode->yres = yres;
1208 	}
1209 
1210 	if (refresh_specified) {
1211 		mode->refresh_specified = true;
1212 		mode->refresh = refresh;
1213 	}
1214 
1215 	if (bpp_specified) {
1216 		mode->bpp_specified = true;
1217 		mode->bpp = bpp;
1218 	}
1219 	mode->rb = rb;
1220 	mode->cvt = cvt;
1221 	mode->interlace = interlace;
1222 	mode->margins = margins;
1223 	mode->force = force;
1224 
1225 	return true;
1226 }
1227 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
1228 
1229 /**
1230  * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
1231  * @dev: DRM device to create the new mode for
1232  * @cmd: input command line modeline
1233  *
1234  * Returns:
1235  * Pointer to converted mode on success, NULL on error.
1236  */
1237 struct drm_display_mode *
1238 drm_mode_create_from_cmdline_mode(struct drm_device *dev,
1239 				  struct drm_cmdline_mode *cmd)
1240 {
1241 	struct drm_display_mode *mode;
1242 
1243 	if (cmd->cvt)
1244 		mode = drm_cvt_mode(dev,
1245 				    cmd->xres, cmd->yres,
1246 				    cmd->refresh_specified ? cmd->refresh : 60,
1247 				    cmd->rb, cmd->interlace,
1248 				    cmd->margins);
1249 	else
1250 		mode = drm_gtf_mode(dev,
1251 				    cmd->xres, cmd->yres,
1252 				    cmd->refresh_specified ? cmd->refresh : 60,
1253 				    cmd->interlace,
1254 				    cmd->margins);
1255 	if (!mode)
1256 		return NULL;
1257 
1258 	mode->type |= DRM_MODE_TYPE_USERDEF;
1259 	drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
1260 	return mode;
1261 }
1262 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
1263