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      1 /*	$NetBSD: drm_modes.c,v 1.11 2021/12/19 01:13:59 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright  1997-2003 by The XFree86 Project, Inc.
      5  * Copyright  2007 Dave Airlie
      6  * Copyright  2007-2008 Intel Corporation
      7  *   Jesse Barnes <jesse.barnes (at) intel.com>
      8  * Copyright 2005-2006 Luc Verhaegen
      9  * Copyright (c) 2001, Andy Ritger  aritger (at) nvidia.com
     10  *
     11  * Permission is hereby granted, free of charge, to any person obtaining a
     12  * copy of this software and associated documentation files (the "Software"),
     13  * to deal in the Software without restriction, including without limitation
     14  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     15  * and/or sell copies of the Software, and to permit persons to whom the
     16  * Software is furnished to do so, subject to the following conditions:
     17  *
     18  * The above copyright notice and this permission notice shall be included in
     19  * all copies or substantial portions of the Software.
     20  *
     21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     22  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     24  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     25  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     26  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     27  * OTHER DEALINGS IN THE SOFTWARE.
     28  *
     29  * Except as contained in this notice, the name of the copyright holder(s)
     30  * and author(s) shall not be used in advertising or otherwise to promote
     31  * the sale, use or other dealings in this Software without prior written
     32  * authorization from the copyright holder(s) and author(s).
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 __KERNEL_RCSID(0, "$NetBSD: drm_modes.c,v 1.11 2021/12/19 01:13:59 riastradh Exp $");
     37 
     38 #include <linux/ctype.h>
     39 #include <linux/list.h>
     40 #include <linux/list_sort.h>
     41 #include <linux/export.h>
     42 #include <asm/div64.h>
     43 
     44 #ifdef CONFIG_VIDEOMODE_HELPERS
     45 #ifdef CONFIG_OF
     46 #include <video/of_videomode.h>
     47 #endif
     48 #include <video/videomode.h>
     49 #endif
     50 
     51 #include <drm/drm_crtc.h>
     52 #include <drm/drm_device.h>
     53 #include <drm/drm_modes.h>
     54 #include <drm/drm_print.h>
     55 
     56 #include "drm_crtc_internal.h"
     57 
     58 /**
     59  * drm_mode_debug_printmodeline - print a mode to dmesg
     60  * @mode: mode to print
     61  *
     62  * Describe @mode using DRM_DEBUG.
     63  */
     64 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
     65 {
     66 	DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode));
     67 }
     68 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
     69 
     70 /**
     71  * drm_mode_create - create a new display mode
     72  * @dev: DRM device
     73  *
     74  * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
     75  * and return it.
     76  *
     77  * Returns:
     78  * Pointer to new mode on success, NULL on error.
     79  */
     80 struct drm_display_mode *drm_mode_create(struct drm_device *dev)
     81 {
     82 	struct drm_display_mode *nmode;
     83 
     84 	nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
     85 	if (!nmode)
     86 		return NULL;
     87 
     88 	return nmode;
     89 }
     90 EXPORT_SYMBOL(drm_mode_create);
     91 
     92 /**
     93  * drm_mode_destroy - remove a mode
     94  * @dev: DRM device
     95  * @mode: mode to remove
     96  *
     97  * Release @mode's unique ID, then free it @mode structure itself using kfree.
     98  */
     99 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
    100 {
    101 	if (!mode)
    102 		return;
    103 
    104 	kfree(mode);
    105 }
    106 EXPORT_SYMBOL(drm_mode_destroy);
    107 
    108 /**
    109  * drm_mode_probed_add - add a mode to a connector's probed_mode list
    110  * @connector: connector the new mode
    111  * @mode: mode data
    112  *
    113  * Add @mode to @connector's probed_mode list for later use. This list should
    114  * then in a second step get filtered and all the modes actually supported by
    115  * the hardware moved to the @connector's modes list.
    116  */
    117 void drm_mode_probed_add(struct drm_connector *connector,
    118 			 struct drm_display_mode *mode)
    119 {
    120 	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
    121 
    122 	list_add_tail(&mode->head, &connector->probed_modes);
    123 }
    124 EXPORT_SYMBOL(drm_mode_probed_add);
    125 
    126 /**
    127  * drm_cvt_mode -create a modeline based on the CVT algorithm
    128  * @dev: drm device
    129  * @hdisplay: hdisplay size
    130  * @vdisplay: vdisplay size
    131  * @vrefresh: vrefresh rate
    132  * @reduced: whether to use reduced blanking
    133  * @interlaced: whether to compute an interlaced mode
    134  * @margins: whether to add margins (borders)
    135  *
    136  * This function is called to generate the modeline based on CVT algorithm
    137  * according to the hdisplay, vdisplay, vrefresh.
    138  * It is based from the VESA(TM) Coordinated Video Timing Generator by
    139  * Graham Loveridge April 9, 2003 available at
    140  * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls
    141  *
    142  * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
    143  * What I have done is to translate it by using integer calculation.
    144  *
    145  * Returns:
    146  * The modeline based on the CVT algorithm stored in a drm_display_mode object.
    147  * The display mode object is allocated with drm_mode_create(). Returns NULL
    148  * when no mode could be allocated.
    149  */
    150 struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
    151 				      int vdisplay, int vrefresh,
    152 				      bool reduced, bool interlaced, bool margins)
    153 {
    154 #define HV_FACTOR			1000
    155 	/* 1) top/bottom margin size (% of height) - default: 1.8, */
    156 #define	CVT_MARGIN_PERCENTAGE		18
    157 	/* 2) character cell horizontal granularity (pixels) - default 8 */
    158 #define	CVT_H_GRANULARITY		8
    159 	/* 3) Minimum vertical porch (lines) - default 3 */
    160 #define	CVT_MIN_V_PORCH			3
    161 	/* 4) Minimum number of vertical back porch lines - default 6 */
    162 #define	CVT_MIN_V_BPORCH		6
    163 	/* Pixel Clock step (kHz) */
    164 #define CVT_CLOCK_STEP			250
    165 	struct drm_display_mode *drm_mode;
    166 	unsigned int vfieldrate, hperiod;
    167 	int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
    168 	int interlace;
    169 	u64 tmp;
    170 
    171 	if (!hdisplay || !vdisplay)
    172 		return NULL;
    173 
    174 	/* allocate the drm_display_mode structure. If failure, we will
    175 	 * return directly
    176 	 */
    177 	drm_mode = drm_mode_create(dev);
    178 	if (!drm_mode)
    179 		return NULL;
    180 
    181 	/* the CVT default refresh rate is 60Hz */
    182 	if (!vrefresh)
    183 		vrefresh = 60;
    184 
    185 	/* the required field fresh rate */
    186 	if (interlaced)
    187 		vfieldrate = vrefresh * 2;
    188 	else
    189 		vfieldrate = vrefresh;
    190 
    191 	/* horizontal pixels */
    192 	hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
    193 
    194 	/* determine the left&right borders */
    195 	hmargin = 0;
    196 	if (margins) {
    197 		hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
    198 		hmargin -= hmargin % CVT_H_GRANULARITY;
    199 	}
    200 	/* find the total active pixels */
    201 	drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
    202 
    203 	/* find the number of lines per field */
    204 	if (interlaced)
    205 		vdisplay_rnd = vdisplay / 2;
    206 	else
    207 		vdisplay_rnd = vdisplay;
    208 
    209 	/* find the top & bottom borders */
    210 	vmargin = 0;
    211 	if (margins)
    212 		vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
    213 
    214 	drm_mode->vdisplay = vdisplay + 2 * vmargin;
    215 
    216 	/* Interlaced */
    217 	if (interlaced)
    218 		interlace = 1;
    219 	else
    220 		interlace = 0;
    221 
    222 	/* Determine VSync Width from aspect ratio */
    223 	if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay))
    224 		vsync = 4;
    225 	else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay))
    226 		vsync = 5;
    227 	else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay))
    228 		vsync = 6;
    229 	else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay))
    230 		vsync = 7;
    231 	else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay))
    232 		vsync = 7;
    233 	else /* custom */
    234 		vsync = 10;
    235 
    236 	if (!reduced) {
    237 		/* simplify the GTF calculation */
    238 		/* 4) Minimum time of vertical sync + back porch interval (s)
    239 		 * default 550.0
    240 		 */
    241 		int tmp1, tmp2;
    242 #define CVT_MIN_VSYNC_BP	550
    243 		/* 3) Nominal HSync width (% of line period) - default 8 */
    244 #define CVT_HSYNC_PERCENTAGE	8
    245 		unsigned int hblank_percentage;
    246 		int vsyncandback_porch, __maybe_unused vback_porch, hblank;
    247 
    248 		/* estimated the horizontal period */
    249 		tmp1 = HV_FACTOR * 1000000  -
    250 				CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
    251 		tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
    252 				interlace;
    253 		hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
    254 
    255 		tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
    256 		/* 9. Find number of lines in sync + backporch */
    257 		if (tmp1 < (vsync + CVT_MIN_V_PORCH))
    258 			vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
    259 		else
    260 			vsyncandback_porch = tmp1;
    261 		/* 10. Find number of lines in back porch */
    262 		vback_porch = vsyncandback_porch - vsync;
    263 		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
    264 				vsyncandback_porch + CVT_MIN_V_PORCH;
    265 		/* 5) Definition of Horizontal blanking time limitation */
    266 		/* Gradient (%/kHz) - default 600 */
    267 #define CVT_M_FACTOR	600
    268 		/* Offset (%) - default 40 */
    269 #define CVT_C_FACTOR	40
    270 		/* Blanking time scaling factor - default 128 */
    271 #define CVT_K_FACTOR	128
    272 		/* Scaling factor weighting - default 20 */
    273 #define CVT_J_FACTOR	20
    274 #define CVT_M_PRIME	(CVT_M_FACTOR * CVT_K_FACTOR / 256)
    275 #define CVT_C_PRIME	((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
    276 			 CVT_J_FACTOR)
    277 		/* 12. Find ideal blanking duty cycle from formula */
    278 		hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
    279 					hperiod / 1000;
    280 		/* 13. Blanking time */
    281 		if (hblank_percentage < 20 * HV_FACTOR)
    282 			hblank_percentage = 20 * HV_FACTOR;
    283 		hblank = drm_mode->hdisplay * hblank_percentage /
    284 			 (100 * HV_FACTOR - hblank_percentage);
    285 		hblank -= hblank % (2 * CVT_H_GRANULARITY);
    286 		/* 14. find the total pixels per line */
    287 		drm_mode->htotal = drm_mode->hdisplay + hblank;
    288 		drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
    289 		drm_mode->hsync_start = drm_mode->hsync_end -
    290 			(drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
    291 		drm_mode->hsync_start += CVT_H_GRANULARITY -
    292 			drm_mode->hsync_start % CVT_H_GRANULARITY;
    293 		/* fill the Vsync values */
    294 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
    295 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
    296 	} else {
    297 		/* Reduced blanking */
    298 		/* Minimum vertical blanking interval time (s)- default 460 */
    299 #define CVT_RB_MIN_VBLANK	460
    300 		/* Fixed number of clocks for horizontal sync */
    301 #define CVT_RB_H_SYNC		32
    302 		/* Fixed number of clocks for horizontal blanking */
    303 #define CVT_RB_H_BLANK		160
    304 		/* Fixed number of lines for vertical front porch - default 3*/
    305 #define CVT_RB_VFPORCH		3
    306 		int vbilines;
    307 		int tmp1, tmp2;
    308 		/* 8. Estimate Horizontal period. */
    309 		tmp1 = HV_FACTOR * 1000000 -
    310 			CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
    311 		tmp2 = vdisplay_rnd + 2 * vmargin;
    312 		hperiod = tmp1 / (tmp2 * vfieldrate);
    313 		/* 9. Find number of lines in vertical blanking */
    314 		vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
    315 		/* 10. Check if vertical blanking is sufficient */
    316 		if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
    317 			vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
    318 		/* 11. Find total number of lines in vertical field */
    319 		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
    320 		/* 12. Find total number of pixels in a line */
    321 		drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
    322 		/* Fill in HSync values */
    323 		drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
    324 		drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC;
    325 		/* Fill in VSync values */
    326 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
    327 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
    328 	}
    329 	/* 15/13. Find pixel clock frequency (kHz for xf86) */
    330 	tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */
    331 	tmp *= HV_FACTOR * 1000;
    332 	do_div(tmp, hperiod);
    333 	tmp -= drm_mode->clock % CVT_CLOCK_STEP;
    334 	drm_mode->clock = tmp;
    335 	/* 18/16. Find actual vertical frame frequency */
    336 	/* ignore - just set the mode flag for interlaced */
    337 	if (interlaced) {
    338 		drm_mode->vtotal *= 2;
    339 		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
    340 	}
    341 	/* Fill the mode line name */
    342 	drm_mode_set_name(drm_mode);
    343 	if (reduced)
    344 		drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
    345 					DRM_MODE_FLAG_NVSYNC);
    346 	else
    347 		drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
    348 					DRM_MODE_FLAG_NHSYNC);
    349 
    350 	return drm_mode;
    351 }
    352 EXPORT_SYMBOL(drm_cvt_mode);
    353 
    354 /**
    355  * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
    356  * @dev: drm device
    357  * @hdisplay: hdisplay size
    358  * @vdisplay: vdisplay size
    359  * @vrefresh: vrefresh rate.
    360  * @interlaced: whether to compute an interlaced mode
    361  * @margins: desired margin (borders) size
    362  * @GTF_M: extended GTF formula parameters
    363  * @GTF_2C: extended GTF formula parameters
    364  * @GTF_K: extended GTF formula parameters
    365  * @GTF_2J: extended GTF formula parameters
    366  *
    367  * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
    368  * in here multiplied by two.  For a C of 40, pass in 80.
    369  *
    370  * Returns:
    371  * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
    372  * The display mode object is allocated with drm_mode_create(). Returns NULL
    373  * when no mode could be allocated.
    374  */
    375 struct drm_display_mode *
    376 drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
    377 		     int vrefresh, bool interlaced, int margins,
    378 		     int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
    379 {	/* 1) top/bottom margin size (% of height) - default: 1.8, */
    380 #define	GTF_MARGIN_PERCENTAGE		18
    381 	/* 2) character cell horizontal granularity (pixels) - default 8 */
    382 #define	GTF_CELL_GRAN			8
    383 	/* 3) Minimum vertical porch (lines) - default 3 */
    384 #define	GTF_MIN_V_PORCH			1
    385 	/* width of vsync in lines */
    386 #define V_SYNC_RQD			3
    387 	/* width of hsync as % of total line */
    388 #define H_SYNC_PERCENT			8
    389 	/* min time of vsync + back porch (microsec) */
    390 #define MIN_VSYNC_PLUS_BP		550
    391 	/* C' and M' are part of the Blanking Duty Cycle computation */
    392 #define GTF_C_PRIME	((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
    393 #define GTF_M_PRIME	(GTF_K * GTF_M / 256)
    394 	struct drm_display_mode *drm_mode;
    395 	unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
    396 	int top_margin, bottom_margin;
    397 	int interlace;
    398 	unsigned int hfreq_est;
    399 	int vsync_plus_bp, __maybe_unused vback_porch;
    400 	unsigned int vtotal_lines, __maybe_unused vfieldrate_est;
    401 	unsigned int __maybe_unused hperiod;
    402 	unsigned int vfield_rate, __maybe_unused vframe_rate;
    403 	int left_margin, right_margin;
    404 	unsigned int total_active_pixels, ideal_duty_cycle;
    405 	unsigned int hblank, total_pixels, pixel_freq;
    406 	int hsync, hfront_porch, vodd_front_porch_lines;
    407 	unsigned int tmp1, tmp2;
    408 
    409 	if (!hdisplay || !vdisplay)
    410 		return NULL;
    411 
    412 	drm_mode = drm_mode_create(dev);
    413 	if (!drm_mode)
    414 		return NULL;
    415 
    416 	/* 1. In order to give correct results, the number of horizontal
    417 	 * pixels requested is first processed to ensure that it is divisible
    418 	 * by the character size, by rounding it to the nearest character
    419 	 * cell boundary:
    420 	 */
    421 	hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
    422 	hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
    423 
    424 	/* 2. If interlace is requested, the number of vertical lines assumed
    425 	 * by the calculation must be halved, as the computation calculates
    426 	 * the number of vertical lines per field.
    427 	 */
    428 	if (interlaced)
    429 		vdisplay_rnd = vdisplay / 2;
    430 	else
    431 		vdisplay_rnd = vdisplay;
    432 
    433 	/* 3. Find the frame rate required: */
    434 	if (interlaced)
    435 		vfieldrate_rqd = vrefresh * 2;
    436 	else
    437 		vfieldrate_rqd = vrefresh;
    438 
    439 	/* 4. Find number of lines in Top margin: */
    440 	top_margin = 0;
    441 	if (margins)
    442 		top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
    443 				1000;
    444 	/* 5. Find number of lines in bottom margin: */
    445 	bottom_margin = top_margin;
    446 
    447 	/* 6. If interlace is required, then set variable interlace: */
    448 	if (interlaced)
    449 		interlace = 1;
    450 	else
    451 		interlace = 0;
    452 
    453 	/* 7. Estimate the Horizontal frequency */
    454 	{
    455 		tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
    456 		tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
    457 				2 + interlace;
    458 		hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
    459 	}
    460 
    461 	/* 8. Find the number of lines in V sync + back porch */
    462 	/* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
    463 	vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
    464 	vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
    465 	/*  9. Find the number of lines in V back porch alone: */
    466 	vback_porch = vsync_plus_bp - V_SYNC_RQD;
    467 	/*  10. Find the total number of lines in Vertical field period: */
    468 	vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
    469 			vsync_plus_bp + GTF_MIN_V_PORCH;
    470 	/*  11. Estimate the Vertical field frequency: */
    471 	vfieldrate_est = hfreq_est / vtotal_lines;
    472 	/*  12. Find the actual horizontal period: */
    473 	hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
    474 
    475 	/*  13. Find the actual Vertical field frequency: */
    476 	vfield_rate = hfreq_est / vtotal_lines;
    477 	/*  14. Find the Vertical frame frequency: */
    478 	if (interlaced)
    479 		vframe_rate = vfield_rate / 2;
    480 	else
    481 		vframe_rate = vfield_rate;
    482 	/*  15. Find number of pixels in left margin: */
    483 	if (margins)
    484 		left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
    485 				1000;
    486 	else
    487 		left_margin = 0;
    488 
    489 	/* 16.Find number of pixels in right margin: */
    490 	right_margin = left_margin;
    491 	/* 17.Find total number of active pixels in image and left and right */
    492 	total_active_pixels = hdisplay_rnd + left_margin + right_margin;
    493 	/* 18.Find the ideal blanking duty cycle from blanking duty cycle */
    494 	ideal_duty_cycle = GTF_C_PRIME * 1000 -
    495 				(GTF_M_PRIME * 1000000 / hfreq_est);
    496 	/* 19.Find the number of pixels in the blanking time to the nearest
    497 	 * double character cell: */
    498 	hblank = total_active_pixels * ideal_duty_cycle /
    499 			(100000 - ideal_duty_cycle);
    500 	hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
    501 	hblank = hblank * 2 * GTF_CELL_GRAN;
    502 	/* 20.Find total number of pixels: */
    503 	total_pixels = total_active_pixels + hblank;
    504 	/* 21.Find pixel clock frequency: */
    505 	pixel_freq = total_pixels * hfreq_est / 1000;
    506 	/* Stage 1 computations are now complete; I should really pass
    507 	 * the results to another function and do the Stage 2 computations,
    508 	 * but I only need a few more values so I'll just append the
    509 	 * computations here for now */
    510 	/* 17. Find the number of pixels in the horizontal sync period: */
    511 	hsync = H_SYNC_PERCENT * total_pixels / 100;
    512 	hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
    513 	hsync = hsync * GTF_CELL_GRAN;
    514 	/* 18. Find the number of pixels in horizontal front porch period */
    515 	hfront_porch = hblank / 2 - hsync;
    516 	/*  36. Find the number of lines in the odd front porch period: */
    517 	vodd_front_porch_lines = GTF_MIN_V_PORCH ;
    518 
    519 	/* finally, pack the results in the mode struct */
    520 	drm_mode->hdisplay = hdisplay_rnd;
    521 	drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
    522 	drm_mode->hsync_end = drm_mode->hsync_start + hsync;
    523 	drm_mode->htotal = total_pixels;
    524 	drm_mode->vdisplay = vdisplay_rnd;
    525 	drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
    526 	drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
    527 	drm_mode->vtotal = vtotal_lines;
    528 
    529 	drm_mode->clock = pixel_freq;
    530 
    531 	if (interlaced) {
    532 		drm_mode->vtotal *= 2;
    533 		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
    534 	}
    535 
    536 	drm_mode_set_name(drm_mode);
    537 	if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
    538 		drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
    539 	else
    540 		drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
    541 
    542 	return drm_mode;
    543 }
    544 EXPORT_SYMBOL(drm_gtf_mode_complex);
    545 
    546 /**
    547  * drm_gtf_mode - create the modeline based on the GTF algorithm
    548  * @dev: drm device
    549  * @hdisplay: hdisplay size
    550  * @vdisplay: vdisplay size
    551  * @vrefresh: vrefresh rate.
    552  * @interlaced: whether to compute an interlaced mode
    553  * @margins: desired margin (borders) size
    554  *
    555  * return the modeline based on GTF algorithm
    556  *
    557  * This function is to create the modeline based on the GTF algorithm.
    558  * Generalized Timing Formula is derived from:
    559  *
    560  *	GTF Spreadsheet by Andy Morrish (1/5/97)
    561  *	available at http://www.vesa.org
    562  *
    563  * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
    564  * What I have done is to translate it by using integer calculation.
    565  * I also refer to the function of fb_get_mode in the file of
    566  * drivers/video/fbmon.c
    567  *
    568  * Standard GTF parameters::
    569  *
    570  *     M = 600
    571  *     C = 40
    572  *     K = 128
    573  *     J = 20
    574  *
    575  * Returns:
    576  * The modeline based on the GTF algorithm stored in a drm_display_mode object.
    577  * The display mode object is allocated with drm_mode_create(). Returns NULL
    578  * when no mode could be allocated.
    579  */
    580 struct drm_display_mode *
    581 drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
    582 	     bool interlaced, int margins)
    583 {
    584 	return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
    585 				    interlaced, margins,
    586 				    600, 40 * 2, 128, 20 * 2);
    587 }
    588 EXPORT_SYMBOL(drm_gtf_mode);
    589 
    590 #ifdef CONFIG_VIDEOMODE_HELPERS
    591 /**
    592  * drm_display_mode_from_videomode - fill in @dmode using @vm,
    593  * @vm: videomode structure to use as source
    594  * @dmode: drm_display_mode structure to use as destination
    595  *
    596  * Fills out @dmode using the display mode specified in @vm.
    597  */
    598 void drm_display_mode_from_videomode(const struct videomode *vm,
    599 				     struct drm_display_mode *dmode)
    600 {
    601 	dmode->hdisplay = vm->hactive;
    602 	dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
    603 	dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
    604 	dmode->htotal = dmode->hsync_end + vm->hback_porch;
    605 
    606 	dmode->vdisplay = vm->vactive;
    607 	dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
    608 	dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
    609 	dmode->vtotal = dmode->vsync_end + vm->vback_porch;
    610 
    611 	dmode->clock = vm->pixelclock / 1000;
    612 
    613 	dmode->flags = 0;
    614 	if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
    615 		dmode->flags |= DRM_MODE_FLAG_PHSYNC;
    616 	else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
    617 		dmode->flags |= DRM_MODE_FLAG_NHSYNC;
    618 	if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
    619 		dmode->flags |= DRM_MODE_FLAG_PVSYNC;
    620 	else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
    621 		dmode->flags |= DRM_MODE_FLAG_NVSYNC;
    622 	if (vm->flags & DISPLAY_FLAGS_INTERLACED)
    623 		dmode->flags |= DRM_MODE_FLAG_INTERLACE;
    624 	if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
    625 		dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
    626 	if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
    627 		dmode->flags |= DRM_MODE_FLAG_DBLCLK;
    628 	drm_mode_set_name(dmode);
    629 }
    630 EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
    631 
    632 /**
    633  * drm_display_mode_to_videomode - fill in @vm using @dmode,
    634  * @dmode: drm_display_mode structure to use as source
    635  * @vm: videomode structure to use as destination
    636  *
    637  * Fills out @vm using the display mode specified in @dmode.
    638  */
    639 void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
    640 				   struct videomode *vm)
    641 {
    642 	vm->hactive = dmode->hdisplay;
    643 	vm->hfront_porch = dmode->hsync_start - dmode->hdisplay;
    644 	vm->hsync_len = dmode->hsync_end - dmode->hsync_start;
    645 	vm->hback_porch = dmode->htotal - dmode->hsync_end;
    646 
    647 	vm->vactive = dmode->vdisplay;
    648 	vm->vfront_porch = dmode->vsync_start - dmode->vdisplay;
    649 	vm->vsync_len = dmode->vsync_end - dmode->vsync_start;
    650 	vm->vback_porch = dmode->vtotal - dmode->vsync_end;
    651 
    652 	vm->pixelclock = dmode->clock * 1000;
    653 
    654 	vm->flags = 0;
    655 	if (dmode->flags & DRM_MODE_FLAG_PHSYNC)
    656 		vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH;
    657 	else if (dmode->flags & DRM_MODE_FLAG_NHSYNC)
    658 		vm->flags |= DISPLAY_FLAGS_HSYNC_LOW;
    659 	if (dmode->flags & DRM_MODE_FLAG_PVSYNC)
    660 		vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH;
    661 	else if (dmode->flags & DRM_MODE_FLAG_NVSYNC)
    662 		vm->flags |= DISPLAY_FLAGS_VSYNC_LOW;
    663 	if (dmode->flags & DRM_MODE_FLAG_INTERLACE)
    664 		vm->flags |= DISPLAY_FLAGS_INTERLACED;
    665 	if (dmode->flags & DRM_MODE_FLAG_DBLSCAN)
    666 		vm->flags |= DISPLAY_FLAGS_DOUBLESCAN;
    667 	if (dmode->flags & DRM_MODE_FLAG_DBLCLK)
    668 		vm->flags |= DISPLAY_FLAGS_DOUBLECLK;
    669 }
    670 EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
    671 
    672 /**
    673  * drm_bus_flags_from_videomode - extract information about pixelclk and
    674  * DE polarity from videomode and store it in a separate variable
    675  * @vm: videomode structure to use
    676  * @bus_flags: information about pixelclk, sync and DE polarity will be stored
    677  * here
    678  *
    679  * Sets DRM_BUS_FLAG_DE_(LOW|HIGH),  DRM_BUS_FLAG_PIXDATA_DRIVE_(POS|NEG)EDGE
    680  * and DISPLAY_FLAGS_SYNC_(POS|NEG)EDGE in @bus_flags according to DISPLAY_FLAGS
    681  * found in @vm
    682  */
    683 void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
    684 {
    685 	*bus_flags = 0;
    686 	if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
    687 		*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE;
    688 	if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
    689 		*bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
    690 
    691 	if (vm->flags & DISPLAY_FLAGS_SYNC_POSEDGE)
    692 		*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE;
    693 	if (vm->flags & DISPLAY_FLAGS_SYNC_NEGEDGE)
    694 		*bus_flags |= DRM_BUS_FLAG_SYNC_DRIVE_NEGEDGE;
    695 
    696 	if (vm->flags & DISPLAY_FLAGS_DE_LOW)
    697 		*bus_flags |= DRM_BUS_FLAG_DE_LOW;
    698 	if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
    699 		*bus_flags |= DRM_BUS_FLAG_DE_HIGH;
    700 }
    701 EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
    702 
    703 #ifdef CONFIG_OF
    704 /**
    705  * of_get_drm_display_mode - get a drm_display_mode from devicetree
    706  * @np: device_node with the timing specification
    707  * @dmode: will be set to the return value
    708  * @bus_flags: information about pixelclk, sync and DE polarity
    709  * @index: index into the list of display timings in devicetree
    710  *
    711  * This function is expensive and should only be used, if only one mode is to be
    712  * read from DT. To get multiple modes start with of_get_display_timings and
    713  * work with that instead.
    714  *
    715  * Returns:
    716  * 0 on success, a negative errno code when no of videomode node was found.
    717  */
    718 int of_get_drm_display_mode(struct device_node *np,
    719 			    struct drm_display_mode *dmode, u32 *bus_flags,
    720 			    int index)
    721 {
    722 	struct videomode vm;
    723 	int ret;
    724 
    725 	ret = of_get_videomode(np, &vm, index);
    726 	if (ret)
    727 		return ret;
    728 
    729 	drm_display_mode_from_videomode(&vm, dmode);
    730 	if (bus_flags)
    731 		drm_bus_flags_from_videomode(&vm, bus_flags);
    732 
    733 	pr_debug("%pOF: got %dx%d display mode\n",
    734 		np, vm.hactive, vm.vactive);
    735 	drm_mode_debug_printmodeline(dmode);
    736 
    737 	return 0;
    738 }
    739 EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
    740 #endif /* CONFIG_OF */
    741 #endif /* CONFIG_VIDEOMODE_HELPERS */
    742 
    743 /**
    744  * drm_mode_set_name - set the name on a mode
    745  * @mode: name will be set in this mode
    746  *
    747  * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay>
    748  * with an optional 'i' suffix for interlaced modes.
    749  */
    750 void drm_mode_set_name(struct drm_display_mode *mode)
    751 {
    752 	bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
    753 
    754 	snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
    755 		 mode->hdisplay, mode->vdisplay,
    756 		 interlaced ? "i" : "");
    757 }
    758 EXPORT_SYMBOL(drm_mode_set_name);
    759 
    760 /**
    761  * drm_mode_hsync - get the hsync of a mode
    762  * @mode: mode
    763  *
    764  * Returns:
    765  * @modes's hsync rate in kHz, rounded to the nearest integer. Calculates the
    766  * value first if it is not yet set.
    767  */
    768 int drm_mode_hsync(const struct drm_display_mode *mode)
    769 {
    770 	unsigned int calc_val;
    771 
    772 	if (mode->hsync)
    773 		return mode->hsync;
    774 
    775 	if (mode->htotal <= 0)
    776 		return 0;
    777 
    778 	calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
    779 	calc_val += 500;				/* round to 1000Hz */
    780 	calc_val /= 1000;				/* truncate to kHz */
    781 
    782 	return calc_val;
    783 }
    784 EXPORT_SYMBOL(drm_mode_hsync);
    785 
    786 /**
    787  * drm_mode_vrefresh - get the vrefresh of a mode
    788  * @mode: mode
    789  *
    790  * Returns:
    791  * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
    792  * value first if it is not yet set.
    793  */
    794 int drm_mode_vrefresh(const struct drm_display_mode *mode)
    795 {
    796 	int refresh = 0;
    797 
    798 	if (mode->vrefresh > 0)
    799 		refresh = mode->vrefresh;
    800 	else if (mode->htotal > 0 && mode->vtotal > 0) {
    801 		unsigned int num, den;
    802 
    803 		num = mode->clock * 1000;
    804 		den = mode->htotal * mode->vtotal;
    805 
    806 		if (mode->flags & DRM_MODE_FLAG_INTERLACE)
    807 			num *= 2;
    808 		if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
    809 			den *= 2;
    810 		if (mode->vscan > 1)
    811 			den *= mode->vscan;
    812 
    813 		refresh = DIV_ROUND_CLOSEST(num, den);
    814 	}
    815 	return refresh;
    816 }
    817 EXPORT_SYMBOL(drm_mode_vrefresh);
    818 
    819 /**
    820  * drm_mode_get_hv_timing - Fetches hdisplay/vdisplay for given mode
    821  * @mode: mode to query
    822  * @hdisplay: hdisplay value to fill in
    823  * @vdisplay: vdisplay value to fill in
    824  *
    825  * The vdisplay value will be doubled if the specified mode is a stereo mode of
    826  * the appropriate layout.
    827  */
    828 void drm_mode_get_hv_timing(const struct drm_display_mode *mode,
    829 			    int *hdisplay, int *vdisplay)
    830 {
    831 	struct drm_display_mode adjusted = *mode;
    832 
    833 	drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE_ONLY);
    834 	*hdisplay = adjusted.crtc_hdisplay;
    835 	*vdisplay = adjusted.crtc_vdisplay;
    836 }
    837 EXPORT_SYMBOL(drm_mode_get_hv_timing);
    838 
    839 /**
    840  * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
    841  * @p: mode
    842  * @adjust_flags: a combination of adjustment flags
    843  *
    844  * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
    845  *
    846  * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
    847  *   interlaced modes.
    848  * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
    849  *   buffers containing two eyes (only adjust the timings when needed, eg. for
    850  *   "frame packing" or "side by side full").
    851  * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not*
    852  *   be performed for doublescan and vscan > 1 modes respectively.
    853  */
    854 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
    855 {
    856 	if (!p)
    857 		return;
    858 
    859 	p->crtc_clock = p->clock;
    860 	p->crtc_hdisplay = p->hdisplay;
    861 	p->crtc_hsync_start = p->hsync_start;
    862 	p->crtc_hsync_end = p->hsync_end;
    863 	p->crtc_htotal = p->htotal;
    864 	p->crtc_hskew = p->hskew;
    865 	p->crtc_vdisplay = p->vdisplay;
    866 	p->crtc_vsync_start = p->vsync_start;
    867 	p->crtc_vsync_end = p->vsync_end;
    868 	p->crtc_vtotal = p->vtotal;
    869 
    870 	if (p->flags & DRM_MODE_FLAG_INTERLACE) {
    871 		if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
    872 			p->crtc_vdisplay /= 2;
    873 			p->crtc_vsync_start /= 2;
    874 			p->crtc_vsync_end /= 2;
    875 			p->crtc_vtotal /= 2;
    876 		}
    877 	}
    878 
    879 	if (!(adjust_flags & CRTC_NO_DBLSCAN)) {
    880 		if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
    881 			p->crtc_vdisplay *= 2;
    882 			p->crtc_vsync_start *= 2;
    883 			p->crtc_vsync_end *= 2;
    884 			p->crtc_vtotal *= 2;
    885 		}
    886 	}
    887 
    888 	if (!(adjust_flags & CRTC_NO_VSCAN)) {
    889 		if (p->vscan > 1) {
    890 			p->crtc_vdisplay *= p->vscan;
    891 			p->crtc_vsync_start *= p->vscan;
    892 			p->crtc_vsync_end *= p->vscan;
    893 			p->crtc_vtotal *= p->vscan;
    894 		}
    895 	}
    896 
    897 	if (adjust_flags & CRTC_STEREO_DOUBLE) {
    898 		unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
    899 
    900 		switch (layout) {
    901 		case DRM_MODE_FLAG_3D_FRAME_PACKING:
    902 			p->crtc_clock *= 2;
    903 			p->crtc_vdisplay += p->crtc_vtotal;
    904 			p->crtc_vsync_start += p->crtc_vtotal;
    905 			p->crtc_vsync_end += p->crtc_vtotal;
    906 			p->crtc_vtotal += p->crtc_vtotal;
    907 			break;
    908 		}
    909 	}
    910 
    911 	p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
    912 	p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
    913 	p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
    914 	p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
    915 }
    916 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
    917 
    918 /**
    919  * drm_mode_copy - copy the mode
    920  * @dst: mode to overwrite
    921  * @src: mode to copy
    922  *
    923  * Copy an existing mode into another mode, preserving the object id and
    924  * list head of the destination mode.
    925  */
    926 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
    927 {
    928 	struct list_head head = dst->head;
    929 
    930 	*dst = *src;
    931 	dst->head = head;
    932 }
    933 EXPORT_SYMBOL(drm_mode_copy);
    934 
    935 /**
    936  * drm_mode_duplicate - allocate and duplicate an existing mode
    937  * @dev: drm_device to allocate the duplicated mode for
    938  * @mode: mode to duplicate
    939  *
    940  * Just allocate a new mode, copy the existing mode into it, and return
    941  * a pointer to it.  Used to create new instances of established modes.
    942  *
    943  * Returns:
    944  * Pointer to duplicated mode on success, NULL on error.
    945  */
    946 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
    947 					    const struct drm_display_mode *mode)
    948 {
    949 	struct drm_display_mode *nmode;
    950 
    951 	nmode = drm_mode_create(dev);
    952 	if (!nmode)
    953 		return NULL;
    954 
    955 	drm_mode_copy(nmode, mode);
    956 
    957 	return nmode;
    958 }
    959 EXPORT_SYMBOL(drm_mode_duplicate);
    960 
    961 static bool drm_mode_match_timings(const struct drm_display_mode *mode1,
    962 				   const struct drm_display_mode *mode2)
    963 {
    964 	return mode1->hdisplay == mode2->hdisplay &&
    965 		mode1->hsync_start == mode2->hsync_start &&
    966 		mode1->hsync_end == mode2->hsync_end &&
    967 		mode1->htotal == mode2->htotal &&
    968 		mode1->hskew == mode2->hskew &&
    969 		mode1->vdisplay == mode2->vdisplay &&
    970 		mode1->vsync_start == mode2->vsync_start &&
    971 		mode1->vsync_end == mode2->vsync_end &&
    972 		mode1->vtotal == mode2->vtotal &&
    973 		mode1->vscan == mode2->vscan;
    974 }
    975 
    976 static bool drm_mode_match_clock(const struct drm_display_mode *mode1,
    977 				  const struct drm_display_mode *mode2)
    978 {
    979 	/*
    980 	 * do clock check convert to PICOS
    981 	 * so fb modes get matched the same
    982 	 */
    983 	if (mode1->clock && mode2->clock)
    984 		return KHZ2PICOS(mode1->clock) == KHZ2PICOS(mode2->clock);
    985 	else
    986 		return mode1->clock == mode2->clock;
    987 }
    988 
    989 static bool drm_mode_match_flags(const struct drm_display_mode *mode1,
    990 				 const struct drm_display_mode *mode2)
    991 {
    992 	return (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
    993 		(mode2->flags & ~DRM_MODE_FLAG_3D_MASK);
    994 }
    995 
    996 static bool drm_mode_match_3d_flags(const struct drm_display_mode *mode1,
    997 				    const struct drm_display_mode *mode2)
    998 {
    999 	return (mode1->flags & DRM_MODE_FLAG_3D_MASK) ==
   1000 		(mode2->flags & DRM_MODE_FLAG_3D_MASK);
   1001 }
   1002 
   1003 static bool drm_mode_match_aspect_ratio(const struct drm_display_mode *mode1,
   1004 					const struct drm_display_mode *mode2)
   1005 {
   1006 	return mode1->picture_aspect_ratio == mode2->picture_aspect_ratio;
   1007 }
   1008 
   1009 /**
   1010  * drm_mode_match - test modes for (partial) equality
   1011  * @mode1: first mode
   1012  * @mode2: second mode
   1013  * @match_flags: which parts need to match (DRM_MODE_MATCH_*)
   1014  *
   1015  * Check to see if @mode1 and @mode2 are equivalent.
   1016  *
   1017  * Returns:
   1018  * True if the modes are (partially) equal, false otherwise.
   1019  */
   1020 bool drm_mode_match(const struct drm_display_mode *mode1,
   1021 		    const struct drm_display_mode *mode2,
   1022 		    unsigned int match_flags)
   1023 {
   1024 	if (!mode1 && !mode2)
   1025 		return true;
   1026 
   1027 	if (!mode1 || !mode2)
   1028 		return false;
   1029 
   1030 	if (match_flags & DRM_MODE_MATCH_TIMINGS &&
   1031 	    !drm_mode_match_timings(mode1, mode2))
   1032 		return false;
   1033 
   1034 	if (match_flags & DRM_MODE_MATCH_CLOCK &&
   1035 	    !drm_mode_match_clock(mode1, mode2))
   1036 		return false;
   1037 
   1038 	if (match_flags & DRM_MODE_MATCH_FLAGS &&
   1039 	    !drm_mode_match_flags(mode1, mode2))
   1040 		return false;
   1041 
   1042 	if (match_flags & DRM_MODE_MATCH_3D_FLAGS &&
   1043 	    !drm_mode_match_3d_flags(mode1, mode2))
   1044 		return false;
   1045 
   1046 	if (match_flags & DRM_MODE_MATCH_ASPECT_RATIO &&
   1047 	    !drm_mode_match_aspect_ratio(mode1, mode2))
   1048 		return false;
   1049 
   1050 	return true;
   1051 }
   1052 EXPORT_SYMBOL(drm_mode_match);
   1053 
   1054 /**
   1055  * drm_mode_equal - test modes for equality
   1056  * @mode1: first mode
   1057  * @mode2: second mode
   1058  *
   1059  * Check to see if @mode1 and @mode2 are equivalent.
   1060  *
   1061  * Returns:
   1062  * True if the modes are equal, false otherwise.
   1063  */
   1064 bool drm_mode_equal(const struct drm_display_mode *mode1,
   1065 		    const struct drm_display_mode *mode2)
   1066 {
   1067 	return drm_mode_match(mode1, mode2,
   1068 			      DRM_MODE_MATCH_TIMINGS |
   1069 			      DRM_MODE_MATCH_CLOCK |
   1070 			      DRM_MODE_MATCH_FLAGS |
   1071 			      DRM_MODE_MATCH_3D_FLAGS|
   1072 			      DRM_MODE_MATCH_ASPECT_RATIO);
   1073 }
   1074 EXPORT_SYMBOL(drm_mode_equal);
   1075 
   1076 /**
   1077  * drm_mode_equal_no_clocks - test modes for equality
   1078  * @mode1: first mode
   1079  * @mode2: second mode
   1080  *
   1081  * Check to see if @mode1 and @mode2 are equivalent, but
   1082  * don't check the pixel clocks.
   1083  *
   1084  * Returns:
   1085  * True if the modes are equal, false otherwise.
   1086  */
   1087 bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1,
   1088 			      const struct drm_display_mode *mode2)
   1089 {
   1090 	return drm_mode_match(mode1, mode2,
   1091 			      DRM_MODE_MATCH_TIMINGS |
   1092 			      DRM_MODE_MATCH_FLAGS |
   1093 			      DRM_MODE_MATCH_3D_FLAGS);
   1094 }
   1095 EXPORT_SYMBOL(drm_mode_equal_no_clocks);
   1096 
   1097 /**
   1098  * drm_mode_equal_no_clocks_no_stereo - test modes for equality
   1099  * @mode1: first mode
   1100  * @mode2: second mode
   1101  *
   1102  * Check to see if @mode1 and @mode2 are equivalent, but
   1103  * don't check the pixel clocks nor the stereo layout.
   1104  *
   1105  * Returns:
   1106  * True if the modes are equal, false otherwise.
   1107  */
   1108 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
   1109 					const struct drm_display_mode *mode2)
   1110 {
   1111 	return drm_mode_match(mode1, mode2,
   1112 			      DRM_MODE_MATCH_TIMINGS |
   1113 			      DRM_MODE_MATCH_FLAGS);
   1114 }
   1115 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
   1116 
   1117 static enum drm_mode_status
   1118 drm_mode_validate_basic(const struct drm_display_mode *mode)
   1119 {
   1120 	if (mode->type & ~DRM_MODE_TYPE_ALL)
   1121 		return MODE_BAD;
   1122 
   1123 	if (mode->flags & ~DRM_MODE_FLAG_ALL)
   1124 		return MODE_BAD;
   1125 
   1126 	if ((mode->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX)
   1127 		return MODE_BAD;
   1128 
   1129 	if (mode->clock == 0)
   1130 		return MODE_CLOCK_LOW;
   1131 
   1132 	if (mode->hdisplay == 0 ||
   1133 	    mode->hsync_start < mode->hdisplay ||
   1134 	    mode->hsync_end < mode->hsync_start ||
   1135 	    mode->htotal < mode->hsync_end)
   1136 		return MODE_H_ILLEGAL;
   1137 
   1138 	if (mode->vdisplay == 0 ||
   1139 	    mode->vsync_start < mode->vdisplay ||
   1140 	    mode->vsync_end < mode->vsync_start ||
   1141 	    mode->vtotal < mode->vsync_end)
   1142 		return MODE_V_ILLEGAL;
   1143 
   1144 	return MODE_OK;
   1145 }
   1146 
   1147 /**
   1148  * drm_mode_validate_driver - make sure the mode is somewhat sane
   1149  * @dev: drm device
   1150  * @mode: mode to check
   1151  *
   1152  * First do basic validation on the mode, and then allow the driver
   1153  * to check for device/driver specific limitations via the optional
   1154  * &drm_mode_config_helper_funcs.mode_valid hook.
   1155  *
   1156  * Returns:
   1157  * The mode status
   1158  */
   1159 enum drm_mode_status
   1160 drm_mode_validate_driver(struct drm_device *dev,
   1161 			const struct drm_display_mode *mode)
   1162 {
   1163 	enum drm_mode_status status;
   1164 
   1165 	status = drm_mode_validate_basic(mode);
   1166 	if (status != MODE_OK)
   1167 		return status;
   1168 
   1169 	if (dev->mode_config.funcs->mode_valid)
   1170 		return dev->mode_config.funcs->mode_valid(dev, mode);
   1171 	else
   1172 		return MODE_OK;
   1173 }
   1174 EXPORT_SYMBOL(drm_mode_validate_driver);
   1175 
   1176 /**
   1177  * drm_mode_validate_size - make sure modes adhere to size constraints
   1178  * @mode: mode to check
   1179  * @maxX: maximum width
   1180  * @maxY: maximum height
   1181  *
   1182  * This function is a helper which can be used to validate modes against size
   1183  * limitations of the DRM device/connector. If a mode is too big its status
   1184  * member is updated with the appropriate validation failure code. The list
   1185  * itself is not changed.
   1186  *
   1187  * Returns:
   1188  * The mode status
   1189  */
   1190 enum drm_mode_status
   1191 drm_mode_validate_size(const struct drm_display_mode *mode,
   1192 		       int maxX, int maxY)
   1193 {
   1194 	if (maxX > 0 && mode->hdisplay > maxX)
   1195 		return MODE_VIRTUAL_X;
   1196 
   1197 #if defined(DRM_MAX_RESOLUTION_HORIZONTAL)
   1198 	if (mode->hdisplay > DRM_MAX_RESOLUTION_HORIZONTAL)
   1199 		return MODE_VIRTUAL_X;
   1200 #endif
   1201 
   1202 	if (maxY > 0 && mode->vdisplay > maxY)
   1203 		return MODE_VIRTUAL_Y;
   1204 
   1205 #if defined(DRM_MAX_RESOLUTION_VERTICAL)
   1206 	if (mode->vdisplay > DRM_MAX_RESOLUTION_VERTICAL)
   1207 		return MODE_VIRTUAL_Y;
   1208 #endif
   1209 
   1210 	return MODE_OK;
   1211 }
   1212 EXPORT_SYMBOL(drm_mode_validate_size);
   1213 
   1214 /**
   1215  * drm_mode_validate_ycbcr420 - add 'ycbcr420-only' modes only when allowed
   1216  * @mode: mode to check
   1217  * @connector: drm connector under action
   1218  *
   1219  * This function is a helper which can be used to filter out any YCBCR420
   1220  * only mode, when the source doesn't support it.
   1221  *
   1222  * Returns:
   1223  * The mode status
   1224  */
   1225 enum drm_mode_status
   1226 drm_mode_validate_ycbcr420(const struct drm_display_mode *mode,
   1227 			   struct drm_connector *connector)
   1228 {
   1229 	u8 vic = drm_match_cea_mode(mode);
   1230 	enum drm_mode_status status = MODE_OK;
   1231 	struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
   1232 
   1233 	if (test_bit(vic, hdmi->y420_vdb_modes)) {
   1234 		if (!connector->ycbcr_420_allowed)
   1235 			status = MODE_NO_420;
   1236 	}
   1237 
   1238 	return status;
   1239 }
   1240 EXPORT_SYMBOL(drm_mode_validate_ycbcr420);
   1241 
   1242 #define MODE_STATUS(status) [MODE_ ## status + 3] = #status
   1243 
   1244 static const char * const drm_mode_status_names[] = {
   1245 	MODE_STATUS(OK),
   1246 	MODE_STATUS(HSYNC),
   1247 	MODE_STATUS(VSYNC),
   1248 	MODE_STATUS(H_ILLEGAL),
   1249 	MODE_STATUS(V_ILLEGAL),
   1250 	MODE_STATUS(BAD_WIDTH),
   1251 	MODE_STATUS(NOMODE),
   1252 	MODE_STATUS(NO_INTERLACE),
   1253 	MODE_STATUS(NO_DBLESCAN),
   1254 	MODE_STATUS(NO_VSCAN),
   1255 	MODE_STATUS(MEM),
   1256 	MODE_STATUS(VIRTUAL_X),
   1257 	MODE_STATUS(VIRTUAL_Y),
   1258 	MODE_STATUS(MEM_VIRT),
   1259 	MODE_STATUS(NOCLOCK),
   1260 	MODE_STATUS(CLOCK_HIGH),
   1261 	MODE_STATUS(CLOCK_LOW),
   1262 	MODE_STATUS(CLOCK_RANGE),
   1263 	MODE_STATUS(BAD_HVALUE),
   1264 	MODE_STATUS(BAD_VVALUE),
   1265 	MODE_STATUS(BAD_VSCAN),
   1266 	MODE_STATUS(HSYNC_NARROW),
   1267 	MODE_STATUS(HSYNC_WIDE),
   1268 	MODE_STATUS(HBLANK_NARROW),
   1269 	MODE_STATUS(HBLANK_WIDE),
   1270 	MODE_STATUS(VSYNC_NARROW),
   1271 	MODE_STATUS(VSYNC_WIDE),
   1272 	MODE_STATUS(VBLANK_NARROW),
   1273 	MODE_STATUS(VBLANK_WIDE),
   1274 	MODE_STATUS(PANEL),
   1275 	MODE_STATUS(INTERLACE_WIDTH),
   1276 	MODE_STATUS(ONE_WIDTH),
   1277 	MODE_STATUS(ONE_HEIGHT),
   1278 	MODE_STATUS(ONE_SIZE),
   1279 	MODE_STATUS(NO_REDUCED),
   1280 	MODE_STATUS(NO_STEREO),
   1281 	MODE_STATUS(NO_420),
   1282 	MODE_STATUS(STALE),
   1283 	MODE_STATUS(BAD),
   1284 	MODE_STATUS(ERROR),
   1285 };
   1286 
   1287 #undef MODE_STATUS
   1288 
   1289 const char *drm_get_mode_status_name(enum drm_mode_status status)
   1290 {
   1291 	int index = status + 3;
   1292 
   1293 	if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names)))
   1294 		return "";
   1295 
   1296 	return drm_mode_status_names[index];
   1297 }
   1298 
   1299 /**
   1300  * drm_mode_prune_invalid - remove invalid modes from mode list
   1301  * @dev: DRM device
   1302  * @mode_list: list of modes to check
   1303  * @verbose: be verbose about it
   1304  *
   1305  * This helper function can be used to prune a display mode list after
   1306  * validation has been completed. All modes whose status is not MODE_OK will be
   1307  * removed from the list, and if @verbose the status code and mode name is also
   1308  * printed to dmesg.
   1309  */
   1310 void drm_mode_prune_invalid(struct drm_device *dev,
   1311 			    struct list_head *mode_list, bool verbose)
   1312 {
   1313 	struct drm_display_mode *mode, *t;
   1314 
   1315 	list_for_each_entry_safe(mode, t, mode_list, head) {
   1316 		if (mode->status != MODE_OK) {
   1317 			list_del(&mode->head);
   1318 			if (verbose) {
   1319 				drm_mode_debug_printmodeline(mode);
   1320 				DRM_DEBUG_KMS("Not using %s mode: %s\n",
   1321 					      mode->name,
   1322 					      drm_get_mode_status_name(mode->status));
   1323 			}
   1324 			drm_mode_destroy(dev, mode);
   1325 		}
   1326 	}
   1327 }
   1328 EXPORT_SYMBOL(drm_mode_prune_invalid);
   1329 
   1330 /**
   1331  * drm_mode_compare - compare modes for favorability
   1332  * @priv: unused
   1333  * @lh_a: list_head for first mode
   1334  * @lh_b: list_head for second mode
   1335  *
   1336  * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
   1337  * which is better.
   1338  *
   1339  * Returns:
   1340  * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
   1341  * positive if @lh_b is better than @lh_a.
   1342  */
   1343 static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
   1344 {
   1345 	struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
   1346 	struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
   1347 	int diff;
   1348 
   1349 	diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
   1350 		((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
   1351 	if (diff)
   1352 		return diff;
   1353 	diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
   1354 	if (diff)
   1355 		return diff;
   1356 
   1357 	diff = b->vrefresh - a->vrefresh;
   1358 	if (diff)
   1359 		return diff;
   1360 
   1361 	diff = b->clock - a->clock;
   1362 	return diff;
   1363 }
   1364 
   1365 /**
   1366  * drm_mode_sort - sort mode list
   1367  * @mode_list: list of drm_display_mode structures to sort
   1368  *
   1369  * Sort @mode_list by favorability, moving good modes to the head of the list.
   1370  */
   1371 void drm_mode_sort(struct list_head *mode_list)
   1372 {
   1373 	list_sort(NULL, mode_list, drm_mode_compare);
   1374 }
   1375 EXPORT_SYMBOL(drm_mode_sort);
   1376 
   1377 /**
   1378  * drm_connector_list_update - update the mode list for the connector
   1379  * @connector: the connector to update
   1380  *
   1381  * This moves the modes from the @connector probed_modes list
   1382  * to the actual mode list. It compares the probed mode against the current
   1383  * list and only adds different/new modes.
   1384  *
   1385  * This is just a helper functions doesn't validate any modes itself and also
   1386  * doesn't prune any invalid modes. Callers need to do that themselves.
   1387  */
   1388 void drm_connector_list_update(struct drm_connector *connector)
   1389 {
   1390 	struct drm_display_mode *pmode, *pt;
   1391 
   1392 	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
   1393 
   1394 	list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) {
   1395 		struct drm_display_mode *mode;
   1396 		bool found_it = false;
   1397 
   1398 		/* go through current modes checking for the new probed mode */
   1399 		list_for_each_entry(mode, &connector->modes, head) {
   1400 			if (!drm_mode_equal(pmode, mode))
   1401 				continue;
   1402 
   1403 			found_it = true;
   1404 
   1405 			/*
   1406 			 * If the old matching mode is stale (ie. left over
   1407 			 * from a previous probe) just replace it outright.
   1408 			 * Otherwise just merge the type bits between all
   1409 			 * equal probed modes.
   1410 			 *
   1411 			 * If two probed modes are considered equal, pick the
   1412 			 * actual timings from the one that's marked as
   1413 			 * preferred (in case the match isn't 100%). If
   1414 			 * multiple or zero preferred modes are present, favor
   1415 			 * the mode added to the probed_modes list first.
   1416 			 */
   1417 			if (mode->status == MODE_STALE) {
   1418 				drm_mode_copy(mode, pmode);
   1419 			} else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 &&
   1420 				   (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) {
   1421 				pmode->type |= mode->type;
   1422 				drm_mode_copy(mode, pmode);
   1423 			} else {
   1424 				mode->type |= pmode->type;
   1425 			}
   1426 
   1427 			list_del(&pmode->head);
   1428 			drm_mode_destroy(connector->dev, pmode);
   1429 			break;
   1430 		}
   1431 
   1432 		if (!found_it) {
   1433 			list_move_tail(&pmode->head, &connector->modes);
   1434 		}
   1435 	}
   1436 }
   1437 EXPORT_SYMBOL(drm_connector_list_update);
   1438 
   1439 static int drm_mode_parse_cmdline_bpp(const char *str, char **end_ptr,
   1440 				      struct drm_cmdline_mode *mode)
   1441 {
   1442 	unsigned int bpp;
   1443 
   1444 	if (str[0] != '-')
   1445 		return -EINVAL;
   1446 
   1447 	str++;
   1448 	bpp = simple_strtol(str, end_ptr, 10);
   1449 	if (*end_ptr == str)
   1450 		return -EINVAL;
   1451 
   1452 	mode->bpp = bpp;
   1453 	mode->bpp_specified = true;
   1454 
   1455 	return 0;
   1456 }
   1457 
   1458 static int drm_mode_parse_cmdline_refresh(const char *str, char **end_ptr,
   1459 					  struct drm_cmdline_mode *mode)
   1460 {
   1461 	unsigned int refresh;
   1462 
   1463 	if (str[0] != '@')
   1464 		return -EINVAL;
   1465 
   1466 	str++;
   1467 	refresh = simple_strtol(str, end_ptr, 10);
   1468 	if (*end_ptr == str)
   1469 		return -EINVAL;
   1470 
   1471 	mode->refresh = refresh;
   1472 	mode->refresh_specified = true;
   1473 
   1474 	return 0;
   1475 }
   1476 
   1477 static int drm_mode_parse_cmdline_extra(const char *str, int length,
   1478 					bool freestanding,
   1479 					const struct drm_connector *connector,
   1480 					struct drm_cmdline_mode *mode)
   1481 {
   1482 	int i;
   1483 
   1484 	for (i = 0; i < length; i++) {
   1485 		switch (str[i]) {
   1486 		case 'i':
   1487 			if (freestanding)
   1488 				return -EINVAL;
   1489 
   1490 			mode->interlace = true;
   1491 			break;
   1492 		case 'm':
   1493 			if (freestanding)
   1494 				return -EINVAL;
   1495 
   1496 			mode->margins = true;
   1497 			break;
   1498 		case 'D':
   1499 			if (mode->force != DRM_FORCE_UNSPECIFIED)
   1500 				return -EINVAL;
   1501 
   1502 			if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) &&
   1503 			    (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB))
   1504 				mode->force = DRM_FORCE_ON;
   1505 			else
   1506 				mode->force = DRM_FORCE_ON_DIGITAL;
   1507 			break;
   1508 		case 'd':
   1509 			if (mode->force != DRM_FORCE_UNSPECIFIED)
   1510 				return -EINVAL;
   1511 
   1512 			mode->force = DRM_FORCE_OFF;
   1513 			break;
   1514 		case 'e':
   1515 			if (mode->force != DRM_FORCE_UNSPECIFIED)
   1516 				return -EINVAL;
   1517 
   1518 			mode->force = DRM_FORCE_ON;
   1519 			break;
   1520 		default:
   1521 			return -EINVAL;
   1522 		}
   1523 	}
   1524 
   1525 	return 0;
   1526 }
   1527 
   1528 static int drm_mode_parse_cmdline_res_mode(const char *str, unsigned int length,
   1529 					   bool extras,
   1530 					   const struct drm_connector *connector,
   1531 					   struct drm_cmdline_mode *mode)
   1532 {
   1533 	const char *str_start = str;
   1534 	bool rb = false, cvt = false;
   1535 	int xres = 0, yres = 0;
   1536 	int remaining, i;
   1537 	char *end_ptr;
   1538 
   1539 	xres = simple_strtol(str, &end_ptr, 10);
   1540 	if (end_ptr == str)
   1541 		return -EINVAL;
   1542 
   1543 	if (end_ptr[0] != 'x')
   1544 		return -EINVAL;
   1545 	end_ptr++;
   1546 
   1547 	str = end_ptr;
   1548 	yres = simple_strtol(str, &end_ptr, 10);
   1549 	if (end_ptr == str)
   1550 		return -EINVAL;
   1551 
   1552 	remaining = length - (end_ptr - str_start);
   1553 	if (remaining < 0)
   1554 		return -EINVAL;
   1555 
   1556 	for (i = 0; i < remaining; i++) {
   1557 		switch (end_ptr[i]) {
   1558 		case 'M':
   1559 			cvt = true;
   1560 			break;
   1561 		case 'R':
   1562 			rb = true;
   1563 			break;
   1564 		default:
   1565 			/*
   1566 			 * Try to pass that to our extras parsing
   1567 			 * function to handle the case where the
   1568 			 * extras are directly after the resolution
   1569 			 */
   1570 			if (extras) {
   1571 				int ret = drm_mode_parse_cmdline_extra(end_ptr + i,
   1572 								       1,
   1573 								       false,
   1574 								       connector,
   1575 								       mode);
   1576 				if (ret)
   1577 					return ret;
   1578 			} else {
   1579 				return -EINVAL;
   1580 			}
   1581 		}
   1582 	}
   1583 
   1584 	mode->xres = xres;
   1585 	mode->yres = yres;
   1586 	mode->cvt = cvt;
   1587 	mode->rb = rb;
   1588 
   1589 	return 0;
   1590 }
   1591 
   1592 static int drm_mode_parse_cmdline_int(const char *delim, unsigned int *int_ret)
   1593 {
   1594 	const char *value;
   1595 	char *endp;
   1596 
   1597 	/*
   1598 	 * delim must point to the '=', otherwise it is a syntax error and
   1599 	 * if delim points to the terminating zero, then delim + 1 wil point
   1600 	 * past the end of the string.
   1601 	 */
   1602 	if (*delim != '=')
   1603 		return -EINVAL;
   1604 
   1605 	value = delim + 1;
   1606 	*int_ret = simple_strtol(value, &endp, 10);
   1607 
   1608 	/* Make sure we have parsed something */
   1609 	if (endp == value)
   1610 		return -EINVAL;
   1611 
   1612 	return 0;
   1613 }
   1614 
   1615 static int drm_mode_parse_panel_orientation(const char *delim,
   1616 					    struct drm_cmdline_mode *mode)
   1617 {
   1618 	const char *value;
   1619 
   1620 	if (*delim != '=')
   1621 		return -EINVAL;
   1622 
   1623 	value = delim + 1;
   1624 	delim = strchr(value, ',');
   1625 	if (!delim)
   1626 		delim = value + strlen(value);
   1627 
   1628 	if (!strncmp(value, "normal", delim - value))
   1629 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
   1630 	else if (!strncmp(value, "upside_down", delim - value))
   1631 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
   1632 	else if (!strncmp(value, "left_side_up", delim - value))
   1633 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_LEFT_UP;
   1634 	else if (!strncmp(value, "right_side_up", delim - value))
   1635 		mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_RIGHT_UP;
   1636 	else
   1637 		return -EINVAL;
   1638 
   1639 	return 0;
   1640 }
   1641 
   1642 static int drm_mode_parse_cmdline_options(const char *str,
   1643 					  bool freestanding,
   1644 					  const struct drm_connector *connector,
   1645 					  struct drm_cmdline_mode *mode)
   1646 {
   1647 	unsigned int deg, margin, rotation = 0;
   1648 	const char *delim, *option, *sep;
   1649 
   1650 	option = str;
   1651 	do {
   1652 		delim = strchr(option, '=');
   1653 		if (!delim) {
   1654 			delim = strchr(option, ',');
   1655 
   1656 			if (!delim)
   1657 				delim = option + strlen(option);
   1658 		}
   1659 
   1660 		if (!strncmp(option, "rotate", delim - option)) {
   1661 			if (drm_mode_parse_cmdline_int(delim, &deg))
   1662 				return -EINVAL;
   1663 
   1664 			switch (deg) {
   1665 			case 0:
   1666 				rotation |= DRM_MODE_ROTATE_0;
   1667 				break;
   1668 
   1669 			case 90:
   1670 				rotation |= DRM_MODE_ROTATE_90;
   1671 				break;
   1672 
   1673 			case 180:
   1674 				rotation |= DRM_MODE_ROTATE_180;
   1675 				break;
   1676 
   1677 			case 270:
   1678 				rotation |= DRM_MODE_ROTATE_270;
   1679 				break;
   1680 
   1681 			default:
   1682 				return -EINVAL;
   1683 			}
   1684 		} else if (!strncmp(option, "reflect_x", delim - option)) {
   1685 			rotation |= DRM_MODE_REFLECT_X;
   1686 		} else if (!strncmp(option, "reflect_y", delim - option)) {
   1687 			rotation |= DRM_MODE_REFLECT_Y;
   1688 		} else if (!strncmp(option, "margin_right", delim - option)) {
   1689 			if (drm_mode_parse_cmdline_int(delim, &margin))
   1690 				return -EINVAL;
   1691 
   1692 			mode->tv_margins.right = margin;
   1693 		} else if (!strncmp(option, "margin_left", delim - option)) {
   1694 			if (drm_mode_parse_cmdline_int(delim, &margin))
   1695 				return -EINVAL;
   1696 
   1697 			mode->tv_margins.left = margin;
   1698 		} else if (!strncmp(option, "margin_top", delim - option)) {
   1699 			if (drm_mode_parse_cmdline_int(delim, &margin))
   1700 				return -EINVAL;
   1701 
   1702 			mode->tv_margins.top = margin;
   1703 		} else if (!strncmp(option, "margin_bottom", delim - option)) {
   1704 			if (drm_mode_parse_cmdline_int(delim, &margin))
   1705 				return -EINVAL;
   1706 
   1707 			mode->tv_margins.bottom = margin;
   1708 		} else if (!strncmp(option, "panel_orientation", delim - option)) {
   1709 			if (drm_mode_parse_panel_orientation(delim, mode))
   1710 				return -EINVAL;
   1711 		} else {
   1712 			return -EINVAL;
   1713 		}
   1714 		sep = strchr(delim, ',');
   1715 		option = sep + 1;
   1716 	} while (sep);
   1717 
   1718 	if (rotation && freestanding)
   1719 		return -EINVAL;
   1720 
   1721 	if (!(rotation & DRM_MODE_ROTATE_MASK))
   1722 		rotation |= DRM_MODE_ROTATE_0;
   1723 
   1724 	/* Make sure there is exactly one rotation defined */
   1725 	if (!is_power_of_2(rotation & DRM_MODE_ROTATE_MASK))
   1726 		return -EINVAL;
   1727 
   1728 	mode->rotation_reflection = rotation;
   1729 
   1730 	return 0;
   1731 }
   1732 
   1733 static const char * const drm_named_modes_whitelist[] = {
   1734 	"NTSC",
   1735 	"PAL",
   1736 };
   1737 
   1738 /**
   1739  * drm_mode_parse_command_line_for_connector - parse command line modeline for connector
   1740  * @mode_option: optional per connector mode option
   1741  * @connector: connector to parse modeline for
   1742  * @mode: preallocated drm_cmdline_mode structure to fill out
   1743  *
   1744  * This parses @mode_option command line modeline for modes and options to
   1745  * configure the connector. If @mode_option is NULL the default command line
   1746  * modeline in fb_mode_option will be parsed instead.
   1747  *
   1748  * This uses the same parameters as the fb modedb.c, except for an extra
   1749  * force-enable, force-enable-digital and force-disable bit at the end::
   1750  *
   1751  *	<xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd]
   1752  *
   1753  * Additionals options can be provided following the mode, using a comma to
   1754  * separate each option. Valid options can be found in
   1755  * Documentation/fb/modedb.rst.
   1756  *
   1757  * The intermediate drm_cmdline_mode structure is required to store additional
   1758  * options from the command line modline like the force-enable/disable flag.
   1759  *
   1760  * Returns:
   1761  * True if a valid modeline has been parsed, false otherwise.
   1762  */
   1763 bool drm_mode_parse_command_line_for_connector(const char *mode_option,
   1764 					       const struct drm_connector *connector,
   1765 					       struct drm_cmdline_mode *mode)
   1766 {
   1767 	const char *name;
   1768 	bool freestanding = false, parse_extras = false;
   1769 	unsigned int bpp_off = 0, refresh_off = 0, options_off = 0;
   1770 	unsigned int mode_end = 0;
   1771 	const char *bpp_ptr = NULL, *refresh_ptr = NULL, *extra_ptr = NULL;
   1772 	const char *options_ptr = NULL;
   1773 	char *bpp_end_ptr = NULL, *refresh_end_ptr = NULL;
   1774 	int i, len, ret;
   1775 
   1776 	memset(mode, 0, sizeof(*mode));
   1777 	mode->panel_orientation = DRM_MODE_PANEL_ORIENTATION_UNKNOWN;
   1778 
   1779 	if (!mode_option)
   1780 		return false;
   1781 
   1782 	name = mode_option;
   1783 
   1784 	/* Try to locate the bpp and refresh specifiers, if any */
   1785 	bpp_ptr = strchr(name, '-');
   1786 	if (bpp_ptr)
   1787 		bpp_off = bpp_ptr - name;
   1788 
   1789 	refresh_ptr = strchr(name, '@');
   1790 	if (refresh_ptr)
   1791 		refresh_off = refresh_ptr - name;
   1792 
   1793 	/* Locate the start of named options */
   1794 	options_ptr = strchr(name, ',');
   1795 	if (options_ptr)
   1796 		options_off = options_ptr - name;
   1797 
   1798 	/* Locate the end of the name / resolution, and parse it */
   1799 	if (bpp_ptr) {
   1800 		mode_end = bpp_off;
   1801 	} else if (refresh_ptr) {
   1802 		mode_end = refresh_off;
   1803 	} else if (options_ptr) {
   1804 		mode_end = options_off;
   1805 		parse_extras = true;
   1806 	} else {
   1807 		mode_end = strlen(name);
   1808 		parse_extras = true;
   1809 	}
   1810 
   1811 	/* First check for a named mode */
   1812 	for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++) {
   1813 		ret = str_has_prefix(name, drm_named_modes_whitelist[i]);
   1814 		if (ret == mode_end) {
   1815 			if (refresh_ptr)
   1816 				return false; /* named + refresh is invalid */
   1817 
   1818 			strcpy(mode->name, drm_named_modes_whitelist[i]);
   1819 			mode->specified = true;
   1820 			break;
   1821 		}
   1822 	}
   1823 
   1824 	/* No named mode? Check for a normal mode argument, e.g. 1024x768 */
   1825 	if (!mode->specified && isdigit(name[0])) {
   1826 		ret = drm_mode_parse_cmdline_res_mode(name, mode_end,
   1827 						      parse_extras,
   1828 						      connector,
   1829 						      mode);
   1830 		if (ret)
   1831 			return false;
   1832 
   1833 		mode->specified = true;
   1834 	}
   1835 
   1836 	/* No mode? Check for freestanding extras and/or options */
   1837 	if (!mode->specified) {
   1838 		unsigned int len = strlen(mode_option);
   1839 
   1840 		if (bpp_ptr || refresh_ptr)
   1841 			return false; /* syntax error */
   1842 
   1843 		if (len == 1 || (len >= 2 && mode_option[1] == ','))
   1844 			extra_ptr = mode_option;
   1845 		else
   1846 			options_ptr = mode_option - 1;
   1847 
   1848 		freestanding = true;
   1849 	}
   1850 
   1851 	if (bpp_ptr) {
   1852 		ret = drm_mode_parse_cmdline_bpp(bpp_ptr, &bpp_end_ptr, mode);
   1853 		if (ret)
   1854 			return false;
   1855 
   1856 		mode->bpp_specified = true;
   1857 	}
   1858 
   1859 	if (refresh_ptr) {
   1860 		ret = drm_mode_parse_cmdline_refresh(refresh_ptr,
   1861 						     &refresh_end_ptr, mode);
   1862 		if (ret)
   1863 			return false;
   1864 
   1865 		mode->refresh_specified = true;
   1866 	}
   1867 
   1868 	/*
   1869 	 * Locate the end of the bpp / refresh, and parse the extras
   1870 	 * if relevant
   1871 	 */
   1872 	if (bpp_ptr && refresh_ptr)
   1873 		extra_ptr = max(bpp_end_ptr, refresh_end_ptr);
   1874 	else if (bpp_ptr)
   1875 		extra_ptr = bpp_end_ptr;
   1876 	else if (refresh_ptr)
   1877 		extra_ptr = refresh_end_ptr;
   1878 
   1879 	if (extra_ptr) {
   1880 		if (options_ptr)
   1881 			len = options_ptr - extra_ptr;
   1882 		else
   1883 			len = strlen(extra_ptr);
   1884 
   1885 		ret = drm_mode_parse_cmdline_extra(extra_ptr, len, freestanding,
   1886 						   connector, mode);
   1887 		if (ret)
   1888 			return false;
   1889 	}
   1890 
   1891 	if (options_ptr) {
   1892 		ret = drm_mode_parse_cmdline_options(options_ptr + 1,
   1893 						     freestanding,
   1894 						     connector, mode);
   1895 		if (ret)
   1896 			return false;
   1897 	}
   1898 
   1899 	return true;
   1900 }
   1901 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector);
   1902 
   1903 /**
   1904  * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode
   1905  * @dev: DRM device to create the new mode for
   1906  * @cmd: input command line modeline
   1907  *
   1908  * Returns:
   1909  * Pointer to converted mode on success, NULL on error.
   1910  */
   1911 struct drm_display_mode *
   1912 drm_mode_create_from_cmdline_mode(struct drm_device *dev,
   1913 				  struct drm_cmdline_mode *cmd)
   1914 {
   1915 	struct drm_display_mode *mode;
   1916 
   1917 	if (cmd->cvt)
   1918 		mode = drm_cvt_mode(dev,
   1919 				    cmd->xres, cmd->yres,
   1920 				    cmd->refresh_specified ? cmd->refresh : 60,
   1921 				    cmd->rb, cmd->interlace,
   1922 				    cmd->margins);
   1923 	else
   1924 		mode = drm_gtf_mode(dev,
   1925 				    cmd->xres, cmd->yres,
   1926 				    cmd->refresh_specified ? cmd->refresh : 60,
   1927 				    cmd->interlace,
   1928 				    cmd->margins);
   1929 	if (!mode)
   1930 		return NULL;
   1931 
   1932 	mode->type |= DRM_MODE_TYPE_USERDEF;
   1933 	/* fix up 1368x768: GFT/CVT can't express 1366 width due to alignment */
   1934 	if (cmd->xres == 1366)
   1935 		drm_mode_fixup_1366x768(mode);
   1936 	drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
   1937 	return mode;
   1938 }
   1939 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
   1940 
   1941 /**
   1942  * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo
   1943  * @out: drm_mode_modeinfo struct to return to the user
   1944  * @in: drm_display_mode to use
   1945  *
   1946  * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to
   1947  * the user.
   1948  */
   1949 void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
   1950 			       const struct drm_display_mode *in)
   1951 {
   1952 	WARN(in->hdisplay > USHRT_MAX || in->hsync_start > USHRT_MAX ||
   1953 	     in->hsync_end > USHRT_MAX || in->htotal > USHRT_MAX ||
   1954 	     in->hskew > USHRT_MAX || in->vdisplay > USHRT_MAX ||
   1955 	     in->vsync_start > USHRT_MAX || in->vsync_end > USHRT_MAX ||
   1956 	     in->vtotal > USHRT_MAX || in->vscan > USHRT_MAX,
   1957 	     "timing values too large for mode info\n");
   1958 
   1959 	out->clock = in->clock;
   1960 	out->hdisplay = in->hdisplay;
   1961 	out->hsync_start = in->hsync_start;
   1962 	out->hsync_end = in->hsync_end;
   1963 	out->htotal = in->htotal;
   1964 	out->hskew = in->hskew;
   1965 	out->vdisplay = in->vdisplay;
   1966 	out->vsync_start = in->vsync_start;
   1967 	out->vsync_end = in->vsync_end;
   1968 	out->vtotal = in->vtotal;
   1969 	out->vscan = in->vscan;
   1970 	out->vrefresh = in->vrefresh;
   1971 	out->flags = in->flags;
   1972 	out->type = in->type;
   1973 
   1974 	switch (in->picture_aspect_ratio) {
   1975 	case HDMI_PICTURE_ASPECT_4_3:
   1976 		out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
   1977 		break;
   1978 	case HDMI_PICTURE_ASPECT_16_9:
   1979 		out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
   1980 		break;
   1981 	case HDMI_PICTURE_ASPECT_64_27:
   1982 		out->flags |= DRM_MODE_FLAG_PIC_AR_64_27;
   1983 		break;
   1984 	case HDMI_PICTURE_ASPECT_256_135:
   1985 		out->flags |= DRM_MODE_FLAG_PIC_AR_256_135;
   1986 		break;
   1987 	default:
   1988 		WARN(1, "Invalid aspect ratio (0%x) on mode\n",
   1989 		     in->picture_aspect_ratio);
   1990 		/* fall through */
   1991 	case HDMI_PICTURE_ASPECT_NONE:
   1992 		out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
   1993 		break;
   1994 	}
   1995 
   1996 	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
   1997 	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
   1998 }
   1999 
   2000 /**
   2001  * drm_crtc_convert_umode - convert a modeinfo into a drm_display_mode
   2002  * @dev: drm device
   2003  * @out: drm_display_mode to return to the user
   2004  * @in: drm_mode_modeinfo to use
   2005  *
   2006  * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to
   2007  * the caller.
   2008  *
   2009  * Returns:
   2010  * Zero on success, negative errno on failure.
   2011  */
   2012 int drm_mode_convert_umode(struct drm_device *dev,
   2013 			   struct drm_display_mode *out,
   2014 			   const struct drm_mode_modeinfo *in)
   2015 {
   2016 	if (in->clock > INT_MAX || in->vrefresh > INT_MAX)
   2017 		return -ERANGE;
   2018 
   2019 	out->clock = in->clock;
   2020 	out->hdisplay = in->hdisplay;
   2021 	out->hsync_start = in->hsync_start;
   2022 	out->hsync_end = in->hsync_end;
   2023 	out->htotal = in->htotal;
   2024 	out->hskew = in->hskew;
   2025 	out->vdisplay = in->vdisplay;
   2026 	out->vsync_start = in->vsync_start;
   2027 	out->vsync_end = in->vsync_end;
   2028 	out->vtotal = in->vtotal;
   2029 	out->vscan = in->vscan;
   2030 	out->vrefresh = in->vrefresh;
   2031 	out->flags = in->flags;
   2032 	/*
   2033 	 * Old xf86-video-vmware (possibly others too) used to
   2034 	 * leave 'type' unititialized. Just ignore any bits we
   2035 	 * don't like. It's a just hint after all, and more
   2036 	 * useful for the kernel->userspace direction anyway.
   2037 	 */
   2038 	out->type = in->type & DRM_MODE_TYPE_ALL;
   2039 	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
   2040 	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
   2041 
   2042 	/* Clearing picture aspect ratio bits from out flags,
   2043 	 * as the aspect-ratio information is not stored in
   2044 	 * flags for kernel-mode, but in picture_aspect_ratio.
   2045 	 */
   2046 	out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
   2047 
   2048 	switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
   2049 	case DRM_MODE_FLAG_PIC_AR_4_3:
   2050 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_4_3;
   2051 		break;
   2052 	case DRM_MODE_FLAG_PIC_AR_16_9:
   2053 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_16_9;
   2054 		break;
   2055 	case DRM_MODE_FLAG_PIC_AR_64_27:
   2056 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_64_27;
   2057 		break;
   2058 	case DRM_MODE_FLAG_PIC_AR_256_135:
   2059 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_256_135;
   2060 		break;
   2061 	case DRM_MODE_FLAG_PIC_AR_NONE:
   2062 		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
   2063 		break;
   2064 	default:
   2065 		return -EINVAL;
   2066 	}
   2067 
   2068 	out->status = drm_mode_validate_driver(dev, out);
   2069 	if (out->status != MODE_OK)
   2070 		return -EINVAL;
   2071 
   2072 	drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V);
   2073 
   2074 	return 0;
   2075 }
   2076 
   2077 /**
   2078  * drm_mode_is_420_only - if a given videomode can be only supported in YCBCR420
   2079  * output format
   2080  *
   2081  * @display: display under action
   2082  * @mode: video mode to be tested.
   2083  *
   2084  * Returns:
   2085  * true if the mode can be supported in YCBCR420 format
   2086  * false if not.
   2087  */
   2088 bool drm_mode_is_420_only(const struct drm_display_info *display,
   2089 			  const struct drm_display_mode *mode)
   2090 {
   2091 	u8 vic = drm_match_cea_mode(mode);
   2092 
   2093 	return test_bit(vic, display->hdmi.y420_vdb_modes);
   2094 }
   2095 EXPORT_SYMBOL(drm_mode_is_420_only);
   2096 
   2097 /**
   2098  * drm_mode_is_420_also - if a given videomode can be supported in YCBCR420
   2099  * output format also (along with RGB/YCBCR444/422)
   2100  *
   2101  * @display: display under action.
   2102  * @mode: video mode to be tested.
   2103  *
   2104  * Returns:
   2105  * true if the mode can be support YCBCR420 format
   2106  * false if not.
   2107  */
   2108 bool drm_mode_is_420_also(const struct drm_display_info *display,
   2109 			  const struct drm_display_mode *mode)
   2110 {
   2111 	u8 vic = drm_match_cea_mode(mode);
   2112 
   2113 	return test_bit(vic, display->hdmi.y420_cmdb_modes);
   2114 }
   2115 EXPORT_SYMBOL(drm_mode_is_420_also);
   2116 /**
   2117  * drm_mode_is_420 - if a given videomode can be supported in YCBCR420
   2118  * output format
   2119  *
   2120  * @display: display under action.
   2121  * @mode: video mode to be tested.
   2122  *
   2123  * Returns:
   2124  * true if the mode can be supported in YCBCR420 format
   2125  * false if not.
   2126  */
   2127 bool drm_mode_is_420(const struct drm_display_info *display,
   2128 		     const struct drm_display_mode *mode)
   2129 {
   2130 	return drm_mode_is_420_only(display, mode) ||
   2131 		drm_mode_is_420_also(display, mode);
   2132 }
   2133 EXPORT_SYMBOL(drm_mode_is_420);
   2134