1 /* 2 * Copyright © 1997-2003 by The XFree86 Project, Inc. 3 * Copyright © 2007 Dave Airlie 4 * Copyright © 2007-2008 Intel Corporation 5 * Jesse Barnes <jesse.barnes@intel.com> 6 * Copyright 2005-2006 Luc Verhaegen 7 * Copyright (c) 2001, Andy Ritger aritger@nvidia.com 8 * 9 * Permission is hereby granted, free of charge, to any person obtaining a 10 * copy of this software and associated documentation files (the "Software"), 11 * to deal in the Software without restriction, including without limitation 12 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 13 * and/or sell copies of the Software, and to permit persons to whom the 14 * Software is furnished to do so, subject to the following conditions: 15 * 16 * The above copyright notice and this permission notice shall be included in 17 * all copies or substantial portions of the Software. 18 * 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 22 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 25 * OTHER DEALINGS IN THE SOFTWARE. 26 * 27 * Except as contained in this notice, the name of the copyright holder(s) 28 * and author(s) shall not be used in advertising or otherwise to promote 29 * the sale, use or other dealings in this Software without prior written 30 * authorization from the copyright holder(s) and author(s). 31 */ 32 33 #include <linux/list.h> 34 #include <linux/list_sort.h> 35 #include <linux/export.h> 36 #include <drm/drmP.h> 37 #include <drm/drm_crtc.h> 38 #include <video/of_videomode.h> 39 #include <video/videomode.h> 40 #include <drm/drm_modes.h> 41 42 #include "drm_crtc_internal.h" 43 44 /** 45 * drm_mode_debug_printmodeline - print a mode to dmesg 46 * @mode: mode to print 47 * 48 * Describe @mode using DRM_DEBUG. 49 */ 50 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode) 51 { 52 DRM_DEBUG_KMS("Modeline " DRM_MODE_FMT "\n", DRM_MODE_ARG(mode)); 53 } 54 EXPORT_SYMBOL(drm_mode_debug_printmodeline); 55 56 /** 57 * drm_mode_create - create a new display mode 58 * @dev: DRM device 59 * 60 * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it 61 * and return it. 62 * 63 * Returns: 64 * Pointer to new mode on success, NULL on error. 65 */ 66 struct drm_display_mode *drm_mode_create(struct drm_device *dev) 67 { 68 struct drm_display_mode *nmode; 69 70 nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL); 71 if (!nmode) 72 return NULL; 73 74 if (drm_mode_object_get(dev, &nmode->base, DRM_MODE_OBJECT_MODE)) { 75 kfree(nmode); 76 return NULL; 77 } 78 79 return nmode; 80 } 81 EXPORT_SYMBOL(drm_mode_create); 82 83 /** 84 * drm_mode_destroy - remove a mode 85 * @dev: DRM device 86 * @mode: mode to remove 87 * 88 * Release @mode's unique ID, then free it @mode structure itself using kfree. 89 */ 90 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode) 91 { 92 if (!mode) 93 return; 94 95 drm_mode_object_unregister(dev, &mode->base); 96 97 kfree(mode); 98 } 99 EXPORT_SYMBOL(drm_mode_destroy); 100 101 /** 102 * drm_mode_probed_add - add a mode to a connector's probed_mode list 103 * @connector: connector the new mode 104 * @mode: mode data 105 * 106 * Add @mode to @connector's probed_mode list for later use. This list should 107 * then in a second step get filtered and all the modes actually supported by 108 * the hardware moved to the @connector's modes list. 109 */ 110 void drm_mode_probed_add(struct drm_connector *connector, 111 struct drm_display_mode *mode) 112 { 113 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex)); 114 115 list_add_tail(&mode->head, &connector->probed_modes); 116 } 117 EXPORT_SYMBOL(drm_mode_probed_add); 118 119 /** 120 * drm_cvt_mode -create a modeline based on the CVT algorithm 121 * @dev: drm device 122 * @hdisplay: hdisplay size 123 * @vdisplay: vdisplay size 124 * @vrefresh: vrefresh rate 125 * @reduced: whether to use reduced blanking 126 * @interlaced: whether to compute an interlaced mode 127 * @margins: whether to add margins (borders) 128 * 129 * This function is called to generate the modeline based on CVT algorithm 130 * according to the hdisplay, vdisplay, vrefresh. 131 * It is based from the VESA(TM) Coordinated Video Timing Generator by 132 * Graham Loveridge April 9, 2003 available at 133 * http://www.elo.utfsm.cl/~elo212/docs/CVTd6r1.xls 134 * 135 * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c. 136 * What I have done is to translate it by using integer calculation. 137 * 138 * Returns: 139 * The modeline based on the CVT algorithm stored in a drm_display_mode object. 140 * The display mode object is allocated with drm_mode_create(). Returns NULL 141 * when no mode could be allocated. 142 */ 143 struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay, 144 int vdisplay, int vrefresh, 145 bool reduced, bool interlaced, bool margins) 146 { 147 #define HV_FACTOR 1000 148 /* 1) top/bottom margin size (% of height) - default: 1.8, */ 149 #define CVT_MARGIN_PERCENTAGE 18 150 /* 2) character cell horizontal granularity (pixels) - default 8 */ 151 #define CVT_H_GRANULARITY 8 152 /* 3) Minimum vertical porch (lines) - default 3 */ 153 #define CVT_MIN_V_PORCH 3 154 /* 4) Minimum number of vertical back porch lines - default 6 */ 155 #define CVT_MIN_V_BPORCH 6 156 /* Pixel Clock step (kHz) */ 157 #define CVT_CLOCK_STEP 250 158 struct drm_display_mode *drm_mode; 159 unsigned int vfieldrate, hperiod; 160 int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync; 161 int interlace; 162 u64 tmp; 163 164 /* allocate the drm_display_mode structure. If failure, we will 165 * return directly 166 */ 167 drm_mode = drm_mode_create(dev); 168 if (!drm_mode) 169 return NULL; 170 171 /* the CVT default refresh rate is 60Hz */ 172 if (!vrefresh) 173 vrefresh = 60; 174 175 /* the required field fresh rate */ 176 if (interlaced) 177 vfieldrate = vrefresh * 2; 178 else 179 vfieldrate = vrefresh; 180 181 /* horizontal pixels */ 182 hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY); 183 184 /* determine the left&right borders */ 185 hmargin = 0; 186 if (margins) { 187 hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000; 188 hmargin -= hmargin % CVT_H_GRANULARITY; 189 } 190 /* find the total active pixels */ 191 drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin; 192 193 /* find the number of lines per field */ 194 if (interlaced) 195 vdisplay_rnd = vdisplay / 2; 196 else 197 vdisplay_rnd = vdisplay; 198 199 /* find the top & bottom borders */ 200 vmargin = 0; 201 if (margins) 202 vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000; 203 204 drm_mode->vdisplay = vdisplay + 2 * vmargin; 205 206 /* Interlaced */ 207 if (interlaced) 208 interlace = 1; 209 else 210 interlace = 0; 211 212 /* Determine VSync Width from aspect ratio */ 213 if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay)) 214 vsync = 4; 215 else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay)) 216 vsync = 5; 217 else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay)) 218 vsync = 6; 219 else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay)) 220 vsync = 7; 221 else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay)) 222 vsync = 7; 223 else /* custom */ 224 vsync = 10; 225 226 if (!reduced) { 227 /* simplify the GTF calculation */ 228 /* 4) Minimum time of vertical sync + back porch interval (µs) 229 * default 550.0 230 */ 231 int tmp1, tmp2; 232 #define CVT_MIN_VSYNC_BP 550 233 /* 3) Nominal HSync width (% of line period) - default 8 */ 234 #define CVT_HSYNC_PERCENTAGE 8 235 unsigned int hblank_percentage; 236 int vsyncandback_porch, vback_porch, hblank; 237 238 /* estimated the horizontal period */ 239 tmp1 = HV_FACTOR * 1000000 - 240 CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate; 241 tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 + 242 interlace; 243 hperiod = tmp1 * 2 / (tmp2 * vfieldrate); 244 245 tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1; 246 /* 9. Find number of lines in sync + backporch */ 247 if (tmp1 < (vsync + CVT_MIN_V_PORCH)) 248 vsyncandback_porch = vsync + CVT_MIN_V_PORCH; 249 else 250 vsyncandback_porch = tmp1; 251 /* 10. Find number of lines in back porch */ 252 vback_porch = vsyncandback_porch - vsync; 253 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + 254 vsyncandback_porch + CVT_MIN_V_PORCH; 255 /* 5) Definition of Horizontal blanking time limitation */ 256 /* Gradient (%/kHz) - default 600 */ 257 #define CVT_M_FACTOR 600 258 /* Offset (%) - default 40 */ 259 #define CVT_C_FACTOR 40 260 /* Blanking time scaling factor - default 128 */ 261 #define CVT_K_FACTOR 128 262 /* Scaling factor weighting - default 20 */ 263 #define CVT_J_FACTOR 20 264 #define CVT_M_PRIME (CVT_M_FACTOR * CVT_K_FACTOR / 256) 265 #define CVT_C_PRIME ((CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \ 266 CVT_J_FACTOR) 267 /* 12. Find ideal blanking duty cycle from formula */ 268 hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME * 269 hperiod / 1000; 270 /* 13. Blanking time */ 271 if (hblank_percentage < 20 * HV_FACTOR) 272 hblank_percentage = 20 * HV_FACTOR; 273 hblank = drm_mode->hdisplay * hblank_percentage / 274 (100 * HV_FACTOR - hblank_percentage); 275 hblank -= hblank % (2 * CVT_H_GRANULARITY); 276 /* 14. find the total pixels per line */ 277 drm_mode->htotal = drm_mode->hdisplay + hblank; 278 drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2; 279 drm_mode->hsync_start = drm_mode->hsync_end - 280 (drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100; 281 drm_mode->hsync_start += CVT_H_GRANULARITY - 282 drm_mode->hsync_start % CVT_H_GRANULARITY; 283 /* fill the Vsync values */ 284 drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH; 285 drm_mode->vsync_end = drm_mode->vsync_start + vsync; 286 } else { 287 /* Reduced blanking */ 288 /* Minimum vertical blanking interval time (µs)- default 460 */ 289 #define CVT_RB_MIN_VBLANK 460 290 /* Fixed number of clocks for horizontal sync */ 291 #define CVT_RB_H_SYNC 32 292 /* Fixed number of clocks for horizontal blanking */ 293 #define CVT_RB_H_BLANK 160 294 /* Fixed number of lines for vertical front porch - default 3*/ 295 #define CVT_RB_VFPORCH 3 296 int vbilines; 297 int tmp1, tmp2; 298 /* 8. Estimate Horizontal period. */ 299 tmp1 = HV_FACTOR * 1000000 - 300 CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate; 301 tmp2 = vdisplay_rnd + 2 * vmargin; 302 hperiod = tmp1 / (tmp2 * vfieldrate); 303 /* 9. Find number of lines in vertical blanking */ 304 vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1; 305 /* 10. Check if vertical blanking is sufficient */ 306 if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH)) 307 vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH; 308 /* 11. Find total number of lines in vertical field */ 309 drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines; 310 /* 12. Find total number of pixels in a line */ 311 drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK; 312 /* Fill in HSync values */ 313 drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2; 314 drm_mode->hsync_start = drm_mode->hsync_end - CVT_RB_H_SYNC; 315 /* Fill in VSync values */ 316 drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH; 317 drm_mode->vsync_end = drm_mode->vsync_start + vsync; 318 } 319 /* 15/13. Find pixel clock frequency (kHz for xf86) */ 320 tmp = drm_mode->htotal; /* perform intermediate calcs in u64 */ 321 tmp *= HV_FACTOR * 1000; 322 do_div(tmp, hperiod); 323 tmp -= drm_mode->clock % CVT_CLOCK_STEP; 324 drm_mode->clock = tmp; 325 /* 18/16. Find actual vertical frame frequency */ 326 /* ignore - just set the mode flag for interlaced */ 327 if (interlaced) { 328 drm_mode->vtotal *= 2; 329 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE; 330 } 331 /* Fill the mode line name */ 332 drm_mode_set_name(drm_mode); 333 if (reduced) 334 drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC | 335 DRM_MODE_FLAG_NVSYNC); 336 else 337 drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC | 338 DRM_MODE_FLAG_NHSYNC); 339 340 return drm_mode; 341 } 342 EXPORT_SYMBOL(drm_cvt_mode); 343 344 /** 345 * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm 346 * @dev: drm device 347 * @hdisplay: hdisplay size 348 * @vdisplay: vdisplay size 349 * @vrefresh: vrefresh rate. 350 * @interlaced: whether to compute an interlaced mode 351 * @margins: desired margin (borders) size 352 * @GTF_M: extended GTF formula parameters 353 * @GTF_2C: extended GTF formula parameters 354 * @GTF_K: extended GTF formula parameters 355 * @GTF_2J: extended GTF formula parameters 356 * 357 * GTF feature blocks specify C and J in multiples of 0.5, so we pass them 358 * in here multiplied by two. For a C of 40, pass in 80. 359 * 360 * Returns: 361 * The modeline based on the full GTF algorithm stored in a drm_display_mode object. 362 * The display mode object is allocated with drm_mode_create(). Returns NULL 363 * when no mode could be allocated. 364 */ 365 struct drm_display_mode * 366 drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay, 367 int vrefresh, bool interlaced, int margins, 368 int GTF_M, int GTF_2C, int GTF_K, int GTF_2J) 369 { /* 1) top/bottom margin size (% of height) - default: 1.8, */ 370 #define GTF_MARGIN_PERCENTAGE 18 371 /* 2) character cell horizontal granularity (pixels) - default 8 */ 372 #define GTF_CELL_GRAN 8 373 /* 3) Minimum vertical porch (lines) - default 3 */ 374 #define GTF_MIN_V_PORCH 1 375 /* width of vsync in lines */ 376 #define V_SYNC_RQD 3 377 /* width of hsync as % of total line */ 378 #define H_SYNC_PERCENT 8 379 /* min time of vsync + back porch (microsec) */ 380 #define MIN_VSYNC_PLUS_BP 550 381 /* C' and M' are part of the Blanking Duty Cycle computation */ 382 #define GTF_C_PRIME ((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2) 383 #define GTF_M_PRIME (GTF_K * GTF_M / 256) 384 struct drm_display_mode *drm_mode; 385 unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd; 386 int top_margin, bottom_margin; 387 int interlace; 388 unsigned int hfreq_est; 389 int vsync_plus_bp, vback_porch; 390 unsigned int vtotal_lines, vfieldrate_est, hperiod; 391 unsigned int vfield_rate, vframe_rate; 392 int left_margin, right_margin; 393 unsigned int total_active_pixels, ideal_duty_cycle; 394 unsigned int hblank, total_pixels, pixel_freq; 395 int hsync, hfront_porch, vodd_front_porch_lines; 396 unsigned int tmp1, tmp2; 397 398 drm_mode = drm_mode_create(dev); 399 if (!drm_mode) 400 return NULL; 401 402 /* 1. In order to give correct results, the number of horizontal 403 * pixels requested is first processed to ensure that it is divisible 404 * by the character size, by rounding it to the nearest character 405 * cell boundary: 406 */ 407 hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN; 408 hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN; 409 410 /* 2. If interlace is requested, the number of vertical lines assumed 411 * by the calculation must be halved, as the computation calculates 412 * the number of vertical lines per field. 413 */ 414 if (interlaced) 415 vdisplay_rnd = vdisplay / 2; 416 else 417 vdisplay_rnd = vdisplay; 418 419 /* 3. Find the frame rate required: */ 420 if (interlaced) 421 vfieldrate_rqd = vrefresh * 2; 422 else 423 vfieldrate_rqd = vrefresh; 424 425 /* 4. Find number of lines in Top margin: */ 426 top_margin = 0; 427 if (margins) 428 top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) / 429 1000; 430 /* 5. Find number of lines in bottom margin: */ 431 bottom_margin = top_margin; 432 433 /* 6. If interlace is required, then set variable interlace: */ 434 if (interlaced) 435 interlace = 1; 436 else 437 interlace = 0; 438 439 /* 7. Estimate the Horizontal frequency */ 440 { 441 tmp1 = (1000000 - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500; 442 tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) * 443 2 + interlace; 444 hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1; 445 } 446 447 /* 8. Find the number of lines in V sync + back porch */ 448 /* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */ 449 vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000; 450 vsync_plus_bp = (vsync_plus_bp + 500) / 1000; 451 /* 9. Find the number of lines in V back porch alone: */ 452 vback_porch = vsync_plus_bp - V_SYNC_RQD; 453 /* 10. Find the total number of lines in Vertical field period: */ 454 vtotal_lines = vdisplay_rnd + top_margin + bottom_margin + 455 vsync_plus_bp + GTF_MIN_V_PORCH; 456 /* 11. Estimate the Vertical field frequency: */ 457 vfieldrate_est = hfreq_est / vtotal_lines; 458 /* 12. Find the actual horizontal period: */ 459 hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines); 460 461 /* 13. Find the actual Vertical field frequency: */ 462 vfield_rate = hfreq_est / vtotal_lines; 463 /* 14. Find the Vertical frame frequency: */ 464 if (interlaced) 465 vframe_rate = vfield_rate / 2; 466 else 467 vframe_rate = vfield_rate; 468 /* 15. Find number of pixels in left margin: */ 469 if (margins) 470 left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) / 471 1000; 472 else 473 left_margin = 0; 474 475 /* 16.Find number of pixels in right margin: */ 476 right_margin = left_margin; 477 /* 17.Find total number of active pixels in image and left and right */ 478 total_active_pixels = hdisplay_rnd + left_margin + right_margin; 479 /* 18.Find the ideal blanking duty cycle from blanking duty cycle */ 480 ideal_duty_cycle = GTF_C_PRIME * 1000 - 481 (GTF_M_PRIME * 1000000 / hfreq_est); 482 /* 19.Find the number of pixels in the blanking time to the nearest 483 * double character cell: */ 484 hblank = total_active_pixels * ideal_duty_cycle / 485 (100000 - ideal_duty_cycle); 486 hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN); 487 hblank = hblank * 2 * GTF_CELL_GRAN; 488 /* 20.Find total number of pixels: */ 489 total_pixels = total_active_pixels + hblank; 490 /* 21.Find pixel clock frequency: */ 491 pixel_freq = total_pixels * hfreq_est / 1000; 492 /* Stage 1 computations are now complete; I should really pass 493 * the results to another function and do the Stage 2 computations, 494 * but I only need a few more values so I'll just append the 495 * computations here for now */ 496 /* 17. Find the number of pixels in the horizontal sync period: */ 497 hsync = H_SYNC_PERCENT * total_pixels / 100; 498 hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN; 499 hsync = hsync * GTF_CELL_GRAN; 500 /* 18. Find the number of pixels in horizontal front porch period */ 501 hfront_porch = hblank / 2 - hsync; 502 /* 36. Find the number of lines in the odd front porch period: */ 503 vodd_front_porch_lines = GTF_MIN_V_PORCH ; 504 505 /* finally, pack the results in the mode struct */ 506 drm_mode->hdisplay = hdisplay_rnd; 507 drm_mode->hsync_start = hdisplay_rnd + hfront_porch; 508 drm_mode->hsync_end = drm_mode->hsync_start + hsync; 509 drm_mode->htotal = total_pixels; 510 drm_mode->vdisplay = vdisplay_rnd; 511 drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines; 512 drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD; 513 drm_mode->vtotal = vtotal_lines; 514 515 drm_mode->clock = pixel_freq; 516 517 if (interlaced) { 518 drm_mode->vtotal *= 2; 519 drm_mode->flags |= DRM_MODE_FLAG_INTERLACE; 520 } 521 522 drm_mode_set_name(drm_mode); 523 if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40) 524 drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC; 525 else 526 drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC; 527 528 return drm_mode; 529 } 530 EXPORT_SYMBOL(drm_gtf_mode_complex); 531 532 /** 533 * drm_gtf_mode - create the modeline based on the GTF algorithm 534 * @dev: drm device 535 * @hdisplay: hdisplay size 536 * @vdisplay: vdisplay size 537 * @vrefresh: vrefresh rate. 538 * @interlaced: whether to compute an interlaced mode 539 * @margins: desired margin (borders) size 540 * 541 * return the modeline based on GTF algorithm 542 * 543 * This function is to create the modeline based on the GTF algorithm. 544 * Generalized Timing Formula is derived from: 545 * 546 * GTF Spreadsheet by Andy Morrish (1/5/97) 547 * available at http://www.vesa.org 548 * 549 * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c. 550 * What I have done is to translate it by using integer calculation. 551 * I also refer to the function of fb_get_mode in the file of 552 * drivers/video/fbmon.c 553 * 554 * Standard GTF parameters:: 555 * 556 * M = 600 557 * C = 40 558 * K = 128 559 * J = 20 560 * 561 * Returns: 562 * The modeline based on the GTF algorithm stored in a drm_display_mode object. 563 * The display mode object is allocated with drm_mode_create(). Returns NULL 564 * when no mode could be allocated. 565 */ 566 struct drm_display_mode * 567 drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh, 568 bool interlaced, int margins) 569 { 570 return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh, 571 interlaced, margins, 572 600, 40 * 2, 128, 20 * 2); 573 } 574 EXPORT_SYMBOL(drm_gtf_mode); 575 576 #ifdef CONFIG_VIDEOMODE_HELPERS 577 /** 578 * drm_display_mode_from_videomode - fill in @dmode using @vm, 579 * @vm: videomode structure to use as source 580 * @dmode: drm_display_mode structure to use as destination 581 * 582 * Fills out @dmode using the display mode specified in @vm. 583 */ 584 void drm_display_mode_from_videomode(const struct videomode *vm, 585 struct drm_display_mode *dmode) 586 { 587 dmode->hdisplay = vm->hactive; 588 dmode->hsync_start = dmode->hdisplay + vm->hfront_porch; 589 dmode->hsync_end = dmode->hsync_start + vm->hsync_len; 590 dmode->htotal = dmode->hsync_end + vm->hback_porch; 591 592 dmode->vdisplay = vm->vactive; 593 dmode->vsync_start = dmode->vdisplay + vm->vfront_porch; 594 dmode->vsync_end = dmode->vsync_start + vm->vsync_len; 595 dmode->vtotal = dmode->vsync_end + vm->vback_porch; 596 597 dmode->clock = vm->pixelclock / 1000; 598 599 dmode->flags = 0; 600 if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH) 601 dmode->flags |= DRM_MODE_FLAG_PHSYNC; 602 else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW) 603 dmode->flags |= DRM_MODE_FLAG_NHSYNC; 604 if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH) 605 dmode->flags |= DRM_MODE_FLAG_PVSYNC; 606 else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW) 607 dmode->flags |= DRM_MODE_FLAG_NVSYNC; 608 if (vm->flags & DISPLAY_FLAGS_INTERLACED) 609 dmode->flags |= DRM_MODE_FLAG_INTERLACE; 610 if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN) 611 dmode->flags |= DRM_MODE_FLAG_DBLSCAN; 612 if (vm->flags & DISPLAY_FLAGS_DOUBLECLK) 613 dmode->flags |= DRM_MODE_FLAG_DBLCLK; 614 drm_mode_set_name(dmode); 615 } 616 EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode); 617 618 /** 619 * drm_display_mode_to_videomode - fill in @vm using @dmode, 620 * @dmode: drm_display_mode structure to use as source 621 * @vm: videomode structure to use as destination 622 * 623 * Fills out @vm using the display mode specified in @dmode. 624 */ 625 void drm_display_mode_to_videomode(const struct drm_display_mode *dmode, 626 struct videomode *vm) 627 { 628 vm->hactive = dmode->hdisplay; 629 vm->hfront_porch = dmode->hsync_start - dmode->hdisplay; 630 vm->hsync_len = dmode->hsync_end - dmode->hsync_start; 631 vm->hback_porch = dmode->htotal - dmode->hsync_end; 632 633 vm->vactive = dmode->vdisplay; 634 vm->vfront_porch = dmode->vsync_start - dmode->vdisplay; 635 vm->vsync_len = dmode->vsync_end - dmode->vsync_start; 636 vm->vback_porch = dmode->vtotal - dmode->vsync_end; 637 638 vm->pixelclock = dmode->clock * 1000; 639 640 vm->flags = 0; 641 if (dmode->flags & DRM_MODE_FLAG_PHSYNC) 642 vm->flags |= DISPLAY_FLAGS_HSYNC_HIGH; 643 else if (dmode->flags & DRM_MODE_FLAG_NHSYNC) 644 vm->flags |= DISPLAY_FLAGS_HSYNC_LOW; 645 if (dmode->flags & DRM_MODE_FLAG_PVSYNC) 646 vm->flags |= DISPLAY_FLAGS_VSYNC_HIGH; 647 else if (dmode->flags & DRM_MODE_FLAG_NVSYNC) 648 vm->flags |= DISPLAY_FLAGS_VSYNC_LOW; 649 if (dmode->flags & DRM_MODE_FLAG_INTERLACE) 650 vm->flags |= DISPLAY_FLAGS_INTERLACED; 651 if (dmode->flags & DRM_MODE_FLAG_DBLSCAN) 652 vm->flags |= DISPLAY_FLAGS_DOUBLESCAN; 653 if (dmode->flags & DRM_MODE_FLAG_DBLCLK) 654 vm->flags |= DISPLAY_FLAGS_DOUBLECLK; 655 } 656 EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode); 657 658 /** 659 * drm_bus_flags_from_videomode - extract information about pixelclk and 660 * DE polarity from videomode and store it in a separate variable 661 * @vm: videomode structure to use 662 * @bus_flags: information about pixelclk and DE polarity will be stored here 663 * 664 * Sets DRM_BUS_FLAG_DE_(LOW|HIGH) and DRM_BUS_FLAG_PIXDATA_(POS|NEG)EDGE 665 * in @bus_flags according to DISPLAY_FLAGS found in @vm 666 */ 667 void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags) 668 { 669 *bus_flags = 0; 670 if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE) 671 *bus_flags |= DRM_BUS_FLAG_PIXDATA_POSEDGE; 672 if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE) 673 *bus_flags |= DRM_BUS_FLAG_PIXDATA_NEGEDGE; 674 675 if (vm->flags & DISPLAY_FLAGS_DE_LOW) 676 *bus_flags |= DRM_BUS_FLAG_DE_LOW; 677 if (vm->flags & DISPLAY_FLAGS_DE_HIGH) 678 *bus_flags |= DRM_BUS_FLAG_DE_HIGH; 679 } 680 EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode); 681 682 #ifdef CONFIG_OF 683 /** 684 * of_get_drm_display_mode - get a drm_display_mode from devicetree 685 * @np: device_node with the timing specification 686 * @dmode: will be set to the return value 687 * @bus_flags: information about pixelclk and DE polarity 688 * @index: index into the list of display timings in devicetree 689 * 690 * This function is expensive and should only be used, if only one mode is to be 691 * read from DT. To get multiple modes start with of_get_display_timings and 692 * work with that instead. 693 * 694 * Returns: 695 * 0 on success, a negative errno code when no of videomode node was found. 696 */ 697 int of_get_drm_display_mode(struct device_node *np, 698 struct drm_display_mode *dmode, u32 *bus_flags, 699 int index) 700 { 701 struct videomode vm; 702 int ret; 703 704 ret = of_get_videomode(np, &vm, index); 705 if (ret) 706 return ret; 707 708 drm_display_mode_from_videomode(&vm, dmode); 709 if (bus_flags) 710 drm_bus_flags_from_videomode(&vm, bus_flags); 711 712 pr_debug("%s: got %dx%d display mode from %s\n", 713 of_node_full_name(np), vm.hactive, vm.vactive, np->name); 714 drm_mode_debug_printmodeline(dmode); 715 716 return 0; 717 } 718 EXPORT_SYMBOL_GPL(of_get_drm_display_mode); 719 #endif /* CONFIG_OF */ 720 #endif /* CONFIG_VIDEOMODE_HELPERS */ 721 722 /** 723 * drm_mode_set_name - set the name on a mode 724 * @mode: name will be set in this mode 725 * 726 * Set the name of @mode to a standard format which is <hdisplay>x<vdisplay> 727 * with an optional 'i' suffix for interlaced modes. 728 */ 729 void drm_mode_set_name(struct drm_display_mode *mode) 730 { 731 bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE); 732 733 snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s", 734 mode->hdisplay, mode->vdisplay, 735 interlaced ? "i" : ""); 736 } 737 EXPORT_SYMBOL(drm_mode_set_name); 738 739 /** 740 * drm_mode_hsync - get the hsync of a mode 741 * @mode: mode 742 * 743 * Returns: 744 * @modes's hsync rate in kHz, rounded to the nearest integer. Calculates the 745 * value first if it is not yet set. 746 */ 747 int drm_mode_hsync(const struct drm_display_mode *mode) 748 { 749 unsigned int calc_val; 750 751 if (mode->hsync) 752 return mode->hsync; 753 754 if (mode->htotal < 0) 755 return 0; 756 757 calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */ 758 calc_val += 500; /* round to 1000Hz */ 759 calc_val /= 1000; /* truncate to kHz */ 760 761 return calc_val; 762 } 763 EXPORT_SYMBOL(drm_mode_hsync); 764 765 /** 766 * drm_mode_vrefresh - get the vrefresh of a mode 767 * @mode: mode 768 * 769 * Returns: 770 * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the 771 * value first if it is not yet set. 772 */ 773 int drm_mode_vrefresh(const struct drm_display_mode *mode) 774 { 775 int refresh = 0; 776 unsigned int calc_val; 777 778 if (mode->vrefresh > 0) 779 refresh = mode->vrefresh; 780 else if (mode->htotal > 0 && mode->vtotal > 0) { 781 int vtotal; 782 vtotal = mode->vtotal; 783 /* work out vrefresh the value will be x1000 */ 784 calc_val = (mode->clock * 1000); 785 calc_val /= mode->htotal; 786 refresh = (calc_val + vtotal / 2) / vtotal; 787 788 if (mode->flags & DRM_MODE_FLAG_INTERLACE) 789 refresh *= 2; 790 if (mode->flags & DRM_MODE_FLAG_DBLSCAN) 791 refresh /= 2; 792 if (mode->vscan > 1) 793 refresh /= mode->vscan; 794 } 795 return refresh; 796 } 797 EXPORT_SYMBOL(drm_mode_vrefresh); 798 799 /** 800 * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters 801 * @p: mode 802 * @adjust_flags: a combination of adjustment flags 803 * 804 * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary. 805 * 806 * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of 807 * interlaced modes. 808 * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for 809 * buffers containing two eyes (only adjust the timings when needed, eg. for 810 * "frame packing" or "side by side full"). 811 * - The CRTC_NO_DBLSCAN and CRTC_NO_VSCAN flags request that adjustment *not* 812 * be performed for doublescan and vscan > 1 modes respectively. 813 */ 814 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags) 815 { 816 if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN)) 817 return; 818 819 p->crtc_clock = p->clock; 820 p->crtc_hdisplay = p->hdisplay; 821 p->crtc_hsync_start = p->hsync_start; 822 p->crtc_hsync_end = p->hsync_end; 823 p->crtc_htotal = p->htotal; 824 p->crtc_hskew = p->hskew; 825 p->crtc_vdisplay = p->vdisplay; 826 p->crtc_vsync_start = p->vsync_start; 827 p->crtc_vsync_end = p->vsync_end; 828 p->crtc_vtotal = p->vtotal; 829 830 if (p->flags & DRM_MODE_FLAG_INTERLACE) { 831 if (adjust_flags & CRTC_INTERLACE_HALVE_V) { 832 p->crtc_vdisplay /= 2; 833 p->crtc_vsync_start /= 2; 834 p->crtc_vsync_end /= 2; 835 p->crtc_vtotal /= 2; 836 } 837 } 838 839 if (!(adjust_flags & CRTC_NO_DBLSCAN)) { 840 if (p->flags & DRM_MODE_FLAG_DBLSCAN) { 841 p->crtc_vdisplay *= 2; 842 p->crtc_vsync_start *= 2; 843 p->crtc_vsync_end *= 2; 844 p->crtc_vtotal *= 2; 845 } 846 } 847 848 if (!(adjust_flags & CRTC_NO_VSCAN)) { 849 if (p->vscan > 1) { 850 p->crtc_vdisplay *= p->vscan; 851 p->crtc_vsync_start *= p->vscan; 852 p->crtc_vsync_end *= p->vscan; 853 p->crtc_vtotal *= p->vscan; 854 } 855 } 856 857 if (adjust_flags & CRTC_STEREO_DOUBLE) { 858 unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK; 859 860 switch (layout) { 861 case DRM_MODE_FLAG_3D_FRAME_PACKING: 862 p->crtc_clock *= 2; 863 p->crtc_vdisplay += p->crtc_vtotal; 864 p->crtc_vsync_start += p->crtc_vtotal; 865 p->crtc_vsync_end += p->crtc_vtotal; 866 p->crtc_vtotal += p->crtc_vtotal; 867 break; 868 } 869 } 870 871 p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay); 872 p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal); 873 p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay); 874 p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal); 875 } 876 EXPORT_SYMBOL(drm_mode_set_crtcinfo); 877 878 /** 879 * drm_mode_copy - copy the mode 880 * @dst: mode to overwrite 881 * @src: mode to copy 882 * 883 * Copy an existing mode into another mode, preserving the object id and 884 * list head of the destination mode. 885 */ 886 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src) 887 { 888 int id = dst->base.id; 889 struct list_head head = dst->head; 890 891 *dst = *src; 892 dst->base.id = id; 893 dst->head = head; 894 } 895 EXPORT_SYMBOL(drm_mode_copy); 896 897 /** 898 * drm_mode_duplicate - allocate and duplicate an existing mode 899 * @dev: drm_device to allocate the duplicated mode for 900 * @mode: mode to duplicate 901 * 902 * Just allocate a new mode, copy the existing mode into it, and return 903 * a pointer to it. Used to create new instances of established modes. 904 * 905 * Returns: 906 * Pointer to duplicated mode on success, NULL on error. 907 */ 908 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev, 909 const struct drm_display_mode *mode) 910 { 911 struct drm_display_mode *nmode; 912 913 nmode = drm_mode_create(dev); 914 if (!nmode) 915 return NULL; 916 917 drm_mode_copy(nmode, mode); 918 919 return nmode; 920 } 921 EXPORT_SYMBOL(drm_mode_duplicate); 922 923 /** 924 * drm_mode_equal - test modes for equality 925 * @mode1: first mode 926 * @mode2: second mode 927 * 928 * Check to see if @mode1 and @mode2 are equivalent. 929 * 930 * Returns: 931 * True if the modes are equal, false otherwise. 932 */ 933 bool drm_mode_equal(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2) 934 { 935 if (!mode1 && !mode2) 936 return true; 937 938 if (!mode1 || !mode2) 939 return false; 940 941 /* do clock check convert to PICOS so fb modes get matched 942 * the same */ 943 if (mode1->clock && mode2->clock) { 944 if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock)) 945 return false; 946 } else if (mode1->clock != mode2->clock) 947 return false; 948 949 return drm_mode_equal_no_clocks(mode1, mode2); 950 } 951 EXPORT_SYMBOL(drm_mode_equal); 952 953 /** 954 * drm_mode_equal_no_clocks - test modes for equality 955 * @mode1: first mode 956 * @mode2: second mode 957 * 958 * Check to see if @mode1 and @mode2 are equivalent, but 959 * don't check the pixel clocks. 960 * 961 * Returns: 962 * True if the modes are equal, false otherwise. 963 */ 964 bool drm_mode_equal_no_clocks(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2) 965 { 966 if ((mode1->flags & DRM_MODE_FLAG_3D_MASK) != 967 (mode2->flags & DRM_MODE_FLAG_3D_MASK)) 968 return false; 969 970 return drm_mode_equal_no_clocks_no_stereo(mode1, mode2); 971 } 972 EXPORT_SYMBOL(drm_mode_equal_no_clocks); 973 974 /** 975 * drm_mode_equal_no_clocks_no_stereo - test modes for equality 976 * @mode1: first mode 977 * @mode2: second mode 978 * 979 * Check to see if @mode1 and @mode2 are equivalent, but 980 * don't check the pixel clocks nor the stereo layout. 981 * 982 * Returns: 983 * True if the modes are equal, false otherwise. 984 */ 985 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1, 986 const struct drm_display_mode *mode2) 987 { 988 if (mode1->hdisplay == mode2->hdisplay && 989 mode1->hsync_start == mode2->hsync_start && 990 mode1->hsync_end == mode2->hsync_end && 991 mode1->htotal == mode2->htotal && 992 mode1->hskew == mode2->hskew && 993 mode1->vdisplay == mode2->vdisplay && 994 mode1->vsync_start == mode2->vsync_start && 995 mode1->vsync_end == mode2->vsync_end && 996 mode1->vtotal == mode2->vtotal && 997 mode1->vscan == mode2->vscan && 998 (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) == 999 (mode2->flags & ~DRM_MODE_FLAG_3D_MASK)) 1000 return true; 1001 1002 return false; 1003 } 1004 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo); 1005 1006 /** 1007 * drm_mode_validate_basic - make sure the mode is somewhat sane 1008 * @mode: mode to check 1009 * 1010 * Check that the mode timings are at least somewhat reasonable. 1011 * Any hardware specific limits are left up for each driver to check. 1012 * 1013 * Returns: 1014 * The mode status 1015 */ 1016 enum drm_mode_status 1017 drm_mode_validate_basic(const struct drm_display_mode *mode) 1018 { 1019 if (mode->clock == 0) 1020 return MODE_CLOCK_LOW; 1021 1022 if (mode->hdisplay == 0 || 1023 mode->hsync_start < mode->hdisplay || 1024 mode->hsync_end < mode->hsync_start || 1025 mode->htotal < mode->hsync_end) 1026 return MODE_H_ILLEGAL; 1027 1028 if (mode->vdisplay == 0 || 1029 mode->vsync_start < mode->vdisplay || 1030 mode->vsync_end < mode->vsync_start || 1031 mode->vtotal < mode->vsync_end) 1032 return MODE_V_ILLEGAL; 1033 1034 return MODE_OK; 1035 } 1036 EXPORT_SYMBOL(drm_mode_validate_basic); 1037 1038 /** 1039 * drm_mode_validate_size - make sure modes adhere to size constraints 1040 * @mode: mode to check 1041 * @maxX: maximum width 1042 * @maxY: maximum height 1043 * 1044 * This function is a helper which can be used to validate modes against size 1045 * limitations of the DRM device/connector. If a mode is too big its status 1046 * member is updated with the appropriate validation failure code. The list 1047 * itself is not changed. 1048 * 1049 * Returns: 1050 * The mode status 1051 */ 1052 enum drm_mode_status 1053 drm_mode_validate_size(const struct drm_display_mode *mode, 1054 int maxX, int maxY) 1055 { 1056 if (maxX > 0 && mode->hdisplay > maxX) 1057 return MODE_VIRTUAL_X; 1058 1059 if (maxY > 0 && mode->vdisplay > maxY) 1060 return MODE_VIRTUAL_Y; 1061 1062 return MODE_OK; 1063 } 1064 EXPORT_SYMBOL(drm_mode_validate_size); 1065 1066 #define MODE_STATUS(status) [MODE_ ## status + 3] = #status 1067 1068 static const char * const drm_mode_status_names[] = { 1069 MODE_STATUS(OK), 1070 MODE_STATUS(HSYNC), 1071 MODE_STATUS(VSYNC), 1072 MODE_STATUS(H_ILLEGAL), 1073 MODE_STATUS(V_ILLEGAL), 1074 MODE_STATUS(BAD_WIDTH), 1075 MODE_STATUS(NOMODE), 1076 MODE_STATUS(NO_INTERLACE), 1077 MODE_STATUS(NO_DBLESCAN), 1078 MODE_STATUS(NO_VSCAN), 1079 MODE_STATUS(MEM), 1080 MODE_STATUS(VIRTUAL_X), 1081 MODE_STATUS(VIRTUAL_Y), 1082 MODE_STATUS(MEM_VIRT), 1083 MODE_STATUS(NOCLOCK), 1084 MODE_STATUS(CLOCK_HIGH), 1085 MODE_STATUS(CLOCK_LOW), 1086 MODE_STATUS(CLOCK_RANGE), 1087 MODE_STATUS(BAD_HVALUE), 1088 MODE_STATUS(BAD_VVALUE), 1089 MODE_STATUS(BAD_VSCAN), 1090 MODE_STATUS(HSYNC_NARROW), 1091 MODE_STATUS(HSYNC_WIDE), 1092 MODE_STATUS(HBLANK_NARROW), 1093 MODE_STATUS(HBLANK_WIDE), 1094 MODE_STATUS(VSYNC_NARROW), 1095 MODE_STATUS(VSYNC_WIDE), 1096 MODE_STATUS(VBLANK_NARROW), 1097 MODE_STATUS(VBLANK_WIDE), 1098 MODE_STATUS(PANEL), 1099 MODE_STATUS(INTERLACE_WIDTH), 1100 MODE_STATUS(ONE_WIDTH), 1101 MODE_STATUS(ONE_HEIGHT), 1102 MODE_STATUS(ONE_SIZE), 1103 MODE_STATUS(NO_REDUCED), 1104 MODE_STATUS(NO_STEREO), 1105 MODE_STATUS(STALE), 1106 MODE_STATUS(BAD), 1107 MODE_STATUS(ERROR), 1108 }; 1109 1110 #undef MODE_STATUS 1111 1112 static const char *drm_get_mode_status_name(enum drm_mode_status status) 1113 { 1114 int index = status + 3; 1115 1116 if (WARN_ON(index < 0 || index >= ARRAY_SIZE(drm_mode_status_names))) 1117 return ""; 1118 1119 return drm_mode_status_names[index]; 1120 } 1121 1122 /** 1123 * drm_mode_prune_invalid - remove invalid modes from mode list 1124 * @dev: DRM device 1125 * @mode_list: list of modes to check 1126 * @verbose: be verbose about it 1127 * 1128 * This helper function can be used to prune a display mode list after 1129 * validation has been completed. All modes who's status is not MODE_OK will be 1130 * removed from the list, and if @verbose the status code and mode name is also 1131 * printed to dmesg. 1132 */ 1133 void drm_mode_prune_invalid(struct drm_device *dev, 1134 struct list_head *mode_list, bool verbose) 1135 { 1136 struct drm_display_mode *mode, *t; 1137 1138 list_for_each_entry_safe(mode, t, mode_list, head) { 1139 if (mode->status != MODE_OK) { 1140 list_del(&mode->head); 1141 if (verbose) { 1142 drm_mode_debug_printmodeline(mode); 1143 DRM_DEBUG_KMS("Not using %s mode: %s\n", 1144 mode->name, 1145 drm_get_mode_status_name(mode->status)); 1146 } 1147 drm_mode_destroy(dev, mode); 1148 } 1149 } 1150 } 1151 EXPORT_SYMBOL(drm_mode_prune_invalid); 1152 1153 /** 1154 * drm_mode_compare - compare modes for favorability 1155 * @priv: unused 1156 * @lh_a: list_head for first mode 1157 * @lh_b: list_head for second mode 1158 * 1159 * Compare two modes, given by @lh_a and @lh_b, returning a value indicating 1160 * which is better. 1161 * 1162 * Returns: 1163 * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or 1164 * positive if @lh_b is better than @lh_a. 1165 */ 1166 static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b) 1167 { 1168 struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head); 1169 struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head); 1170 int diff; 1171 1172 diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) - 1173 ((a->type & DRM_MODE_TYPE_PREFERRED) != 0); 1174 if (diff) 1175 return diff; 1176 diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay; 1177 if (diff) 1178 return diff; 1179 1180 diff = b->vrefresh - a->vrefresh; 1181 if (diff) 1182 return diff; 1183 1184 diff = b->clock - a->clock; 1185 return diff; 1186 } 1187 1188 /** 1189 * drm_mode_sort - sort mode list 1190 * @mode_list: list of drm_display_mode structures to sort 1191 * 1192 * Sort @mode_list by favorability, moving good modes to the head of the list. 1193 */ 1194 void drm_mode_sort(struct list_head *mode_list) 1195 { 1196 list_sort(NULL, mode_list, drm_mode_compare); 1197 } 1198 EXPORT_SYMBOL(drm_mode_sort); 1199 1200 /** 1201 * drm_mode_connector_list_update - update the mode list for the connector 1202 * @connector: the connector to update 1203 * 1204 * This moves the modes from the @connector probed_modes list 1205 * to the actual mode list. It compares the probed mode against the current 1206 * list and only adds different/new modes. 1207 * 1208 * This is just a helper functions doesn't validate any modes itself and also 1209 * doesn't prune any invalid modes. Callers need to do that themselves. 1210 */ 1211 void drm_mode_connector_list_update(struct drm_connector *connector) 1212 { 1213 struct drm_display_mode *pmode, *pt; 1214 1215 WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex)); 1216 1217 list_for_each_entry_safe(pmode, pt, &connector->probed_modes, head) { 1218 struct drm_display_mode *mode; 1219 bool found_it = false; 1220 1221 /* go through current modes checking for the new probed mode */ 1222 list_for_each_entry(mode, &connector->modes, head) { 1223 if (!drm_mode_equal(pmode, mode)) 1224 continue; 1225 1226 found_it = true; 1227 1228 /* 1229 * If the old matching mode is stale (ie. left over 1230 * from a previous probe) just replace it outright. 1231 * Otherwise just merge the type bits between all 1232 * equal probed modes. 1233 * 1234 * If two probed modes are considered equal, pick the 1235 * actual timings from the one that's marked as 1236 * preferred (in case the match isn't 100%). If 1237 * multiple or zero preferred modes are present, favor 1238 * the mode added to the probed_modes list first. 1239 */ 1240 if (mode->status == MODE_STALE) { 1241 drm_mode_copy(mode, pmode); 1242 } else if ((mode->type & DRM_MODE_TYPE_PREFERRED) == 0 && 1243 (pmode->type & DRM_MODE_TYPE_PREFERRED) != 0) { 1244 pmode->type |= mode->type; 1245 drm_mode_copy(mode, pmode); 1246 } else { 1247 mode->type |= pmode->type; 1248 } 1249 1250 list_del(&pmode->head); 1251 drm_mode_destroy(connector->dev, pmode); 1252 break; 1253 } 1254 1255 if (!found_it) { 1256 list_move_tail(&pmode->head, &connector->modes); 1257 } 1258 } 1259 } 1260 EXPORT_SYMBOL(drm_mode_connector_list_update); 1261 1262 /** 1263 * drm_mode_parse_command_line_for_connector - parse command line modeline for connector 1264 * @mode_option: optional per connector mode option 1265 * @connector: connector to parse modeline for 1266 * @mode: preallocated drm_cmdline_mode structure to fill out 1267 * 1268 * This parses @mode_option command line modeline for modes and options to 1269 * configure the connector. If @mode_option is NULL the default command line 1270 * modeline in fb_mode_option will be parsed instead. 1271 * 1272 * This uses the same parameters as the fb modedb.c, except for an extra 1273 * force-enable, force-enable-digital and force-disable bit at the end: 1274 * 1275 * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m][eDd] 1276 * 1277 * The intermediate drm_cmdline_mode structure is required to store additional 1278 * options from the command line modline like the force-enable/disable flag. 1279 * 1280 * Returns: 1281 * True if a valid modeline has been parsed, false otherwise. 1282 */ 1283 bool drm_mode_parse_command_line_for_connector(const char *mode_option, 1284 struct drm_connector *connector, 1285 struct drm_cmdline_mode *mode) 1286 { 1287 const char *name; 1288 unsigned int namelen; 1289 bool res_specified = false, bpp_specified = false, refresh_specified = false; 1290 unsigned int xres = 0, yres = 0, bpp = 32, refresh = 0; 1291 bool yres_specified = false, cvt = false, rb = false; 1292 bool interlace = false, margins = false, was_digit = false; 1293 int i; 1294 enum drm_connector_force force = DRM_FORCE_UNSPECIFIED; 1295 1296 #ifdef CONFIG_FB 1297 if (!mode_option) 1298 mode_option = fb_mode_option; 1299 #endif 1300 1301 if (!mode_option) { 1302 mode->specified = false; 1303 return false; 1304 } 1305 1306 name = mode_option; 1307 namelen = strlen(name); 1308 for (i = namelen-1; i >= 0; i--) { 1309 switch (name[i]) { 1310 case '@': 1311 if (!refresh_specified && !bpp_specified && 1312 !yres_specified && !cvt && !rb && was_digit) { 1313 refresh = simple_strtol(&name[i+1], NULL, 10); 1314 refresh_specified = true; 1315 was_digit = false; 1316 } else 1317 goto done; 1318 break; 1319 case '-': 1320 if (!bpp_specified && !yres_specified && !cvt && 1321 !rb && was_digit) { 1322 bpp = simple_strtol(&name[i+1], NULL, 10); 1323 bpp_specified = true; 1324 was_digit = false; 1325 } else 1326 goto done; 1327 break; 1328 case 'x': 1329 if (!yres_specified && was_digit) { 1330 yres = simple_strtol(&name[i+1], NULL, 10); 1331 yres_specified = true; 1332 was_digit = false; 1333 } else 1334 goto done; 1335 break; 1336 case '0' ... '9': 1337 was_digit = true; 1338 break; 1339 case 'M': 1340 if (yres_specified || cvt || was_digit) 1341 goto done; 1342 cvt = true; 1343 break; 1344 case 'R': 1345 if (yres_specified || cvt || rb || was_digit) 1346 goto done; 1347 rb = true; 1348 break; 1349 case 'm': 1350 if (cvt || yres_specified || was_digit) 1351 goto done; 1352 margins = true; 1353 break; 1354 case 'i': 1355 if (cvt || yres_specified || was_digit) 1356 goto done; 1357 interlace = true; 1358 break; 1359 case 'e': 1360 if (yres_specified || bpp_specified || refresh_specified || 1361 was_digit || (force != DRM_FORCE_UNSPECIFIED)) 1362 goto done; 1363 1364 force = DRM_FORCE_ON; 1365 break; 1366 case 'D': 1367 if (yres_specified || bpp_specified || refresh_specified || 1368 was_digit || (force != DRM_FORCE_UNSPECIFIED)) 1369 goto done; 1370 1371 if ((connector->connector_type != DRM_MODE_CONNECTOR_DVII) && 1372 (connector->connector_type != DRM_MODE_CONNECTOR_HDMIB)) 1373 force = DRM_FORCE_ON; 1374 else 1375 force = DRM_FORCE_ON_DIGITAL; 1376 break; 1377 case 'd': 1378 if (yres_specified || bpp_specified || refresh_specified || 1379 was_digit || (force != DRM_FORCE_UNSPECIFIED)) 1380 goto done; 1381 1382 force = DRM_FORCE_OFF; 1383 break; 1384 default: 1385 goto done; 1386 } 1387 } 1388 1389 if (i < 0 && yres_specified) { 1390 char *ch; 1391 xres = simple_strtol(name, &ch, 10); 1392 if ((ch != NULL) && (*ch == 'x')) 1393 res_specified = true; 1394 else 1395 i = ch - name; 1396 } else if (!yres_specified && was_digit) { 1397 /* catch mode that begins with digits but has no 'x' */ 1398 i = 0; 1399 } 1400 done: 1401 if (i >= 0) { 1402 pr_warn("[drm] parse error at position %i in video mode '%s'\n", 1403 i, name); 1404 mode->specified = false; 1405 return false; 1406 } 1407 1408 if (res_specified) { 1409 mode->specified = true; 1410 mode->xres = xres; 1411 mode->yres = yres; 1412 } 1413 1414 if (refresh_specified) { 1415 mode->refresh_specified = true; 1416 mode->refresh = refresh; 1417 } 1418 1419 if (bpp_specified) { 1420 mode->bpp_specified = true; 1421 mode->bpp = bpp; 1422 } 1423 mode->rb = rb; 1424 mode->cvt = cvt; 1425 mode->interlace = interlace; 1426 mode->margins = margins; 1427 mode->force = force; 1428 1429 return true; 1430 } 1431 EXPORT_SYMBOL(drm_mode_parse_command_line_for_connector); 1432 1433 /** 1434 * drm_mode_create_from_cmdline_mode - convert a command line modeline into a DRM display mode 1435 * @dev: DRM device to create the new mode for 1436 * @cmd: input command line modeline 1437 * 1438 * Returns: 1439 * Pointer to converted mode on success, NULL on error. 1440 */ 1441 struct drm_display_mode * 1442 drm_mode_create_from_cmdline_mode(struct drm_device *dev, 1443 struct drm_cmdline_mode *cmd) 1444 { 1445 struct drm_display_mode *mode; 1446 1447 if (cmd->cvt) 1448 mode = drm_cvt_mode(dev, 1449 cmd->xres, cmd->yres, 1450 cmd->refresh_specified ? cmd->refresh : 60, 1451 cmd->rb, cmd->interlace, 1452 cmd->margins); 1453 else 1454 mode = drm_gtf_mode(dev, 1455 cmd->xres, cmd->yres, 1456 cmd->refresh_specified ? cmd->refresh : 60, 1457 cmd->interlace, 1458 cmd->margins); 1459 if (!mode) 1460 return NULL; 1461 1462 mode->type |= DRM_MODE_TYPE_USERDEF; 1463 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); 1464 return mode; 1465 } 1466 EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode); 1467 1468 /** 1469 * drm_crtc_convert_to_umode - convert a drm_display_mode into a modeinfo 1470 * @out: drm_mode_modeinfo struct to return to the user 1471 * @in: drm_display_mode to use 1472 * 1473 * Convert a drm_display_mode into a drm_mode_modeinfo structure to return to 1474 * the user. 1475 */ 1476 void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out, 1477 const struct drm_display_mode *in) 1478 { 1479 WARN(in->hdisplay > USHRT_MAX || in->hsync_start > USHRT_MAX || 1480 in->hsync_end > USHRT_MAX || in->htotal > USHRT_MAX || 1481 in->hskew > USHRT_MAX || in->vdisplay > USHRT_MAX || 1482 in->vsync_start > USHRT_MAX || in->vsync_end > USHRT_MAX || 1483 in->vtotal > USHRT_MAX || in->vscan > USHRT_MAX, 1484 "timing values too large for mode info\n"); 1485 1486 out->clock = in->clock; 1487 out->hdisplay = in->hdisplay; 1488 out->hsync_start = in->hsync_start; 1489 out->hsync_end = in->hsync_end; 1490 out->htotal = in->htotal; 1491 out->hskew = in->hskew; 1492 out->vdisplay = in->vdisplay; 1493 out->vsync_start = in->vsync_start; 1494 out->vsync_end = in->vsync_end; 1495 out->vtotal = in->vtotal; 1496 out->vscan = in->vscan; 1497 out->vrefresh = in->vrefresh; 1498 out->flags = in->flags; 1499 out->type = in->type; 1500 strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN); 1501 out->name[DRM_DISPLAY_MODE_LEN-1] = 0; 1502 } 1503 1504 /** 1505 * drm_crtc_convert_umode - convert a modeinfo into a drm_display_mode 1506 * @out: drm_display_mode to return to the user 1507 * @in: drm_mode_modeinfo to use 1508 * 1509 * Convert a drm_mode_modeinfo into a drm_display_mode structure to return to 1510 * the caller. 1511 * 1512 * Returns: 1513 * Zero on success, negative errno on failure. 1514 */ 1515 int drm_mode_convert_umode(struct drm_display_mode *out, 1516 const struct drm_mode_modeinfo *in) 1517 { 1518 int ret = -EINVAL; 1519 1520 if (in->clock > INT_MAX || in->vrefresh > INT_MAX) { 1521 ret = -ERANGE; 1522 goto out; 1523 } 1524 1525 if ((in->flags & DRM_MODE_FLAG_3D_MASK) > DRM_MODE_FLAG_3D_MAX) 1526 goto out; 1527 1528 out->clock = in->clock; 1529 out->hdisplay = in->hdisplay; 1530 out->hsync_start = in->hsync_start; 1531 out->hsync_end = in->hsync_end; 1532 out->htotal = in->htotal; 1533 out->hskew = in->hskew; 1534 out->vdisplay = in->vdisplay; 1535 out->vsync_start = in->vsync_start; 1536 out->vsync_end = in->vsync_end; 1537 out->vtotal = in->vtotal; 1538 out->vscan = in->vscan; 1539 out->vrefresh = in->vrefresh; 1540 out->flags = in->flags; 1541 out->type = in->type; 1542 strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN); 1543 out->name[DRM_DISPLAY_MODE_LEN-1] = 0; 1544 1545 out->status = drm_mode_validate_basic(out); 1546 if (out->status != MODE_OK) 1547 goto out; 1548 1549 drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V); 1550 1551 ret = 0; 1552 1553 out: 1554 return ret; 1555 } 1556