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