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