1// SPDX-License-Identifier: MIT 2/* 3 * Copyright �� 2020 Intel Corporation 4 */ 5 6#include <linux/string_helpers.h> 7 8#include "i915_drv.h" 9#include "i915_reg.h" 10#include "intel_dram.h" 11#include "intel_mchbar_regs.h" 12#include "intel_pcode.h" 13#include "vlv_sideband.h" 14 15struct dram_dimm_info { 16 u16 size; 17 u8 width, ranks; 18}; 19 20struct dram_channel_info { 21 struct dram_dimm_info dimm_l, dimm_s; 22 u8 ranks; 23 bool is_16gb_dimm; 24}; 25 26#define DRAM_TYPE_STR(type) [INTEL_DRAM_ ## type] = #type 27 28static const char *intel_dram_type_str(enum intel_dram_type type) 29{ 30 static const char * const str[] = { 31 DRAM_TYPE_STR(UNKNOWN), 32 DRAM_TYPE_STR(DDR3), 33 DRAM_TYPE_STR(DDR4), 34 DRAM_TYPE_STR(LPDDR3), 35 DRAM_TYPE_STR(LPDDR4), 36 }; 37 38 if (type >= ARRAY_SIZE(str)) 39 type = INTEL_DRAM_UNKNOWN; 40 41 return str[type]; 42} 43 44#undef DRAM_TYPE_STR 45 46static void pnv_detect_mem_freq(struct drm_i915_private *dev_priv) 47{ 48 u32 tmp; 49 50 tmp = intel_uncore_read(&dev_priv->uncore, CLKCFG); 51 52 switch (tmp & CLKCFG_FSB_MASK) { 53 case CLKCFG_FSB_533: 54 dev_priv->fsb_freq = 533; /* 133*4 */ 55 break; 56 case CLKCFG_FSB_800: 57 dev_priv->fsb_freq = 800; /* 200*4 */ 58 break; 59 case CLKCFG_FSB_667: 60 dev_priv->fsb_freq = 667; /* 167*4 */ 61 break; 62 case CLKCFG_FSB_400: 63 dev_priv->fsb_freq = 400; /* 100*4 */ 64 break; 65 } 66 67 switch (tmp & CLKCFG_MEM_MASK) { 68 case CLKCFG_MEM_533: 69 dev_priv->mem_freq = 533; 70 break; 71 case CLKCFG_MEM_667: 72 dev_priv->mem_freq = 667; 73 break; 74 case CLKCFG_MEM_800: 75 dev_priv->mem_freq = 800; 76 break; 77 } 78 79 /* detect pineview DDR3 setting */ 80 tmp = intel_uncore_read(&dev_priv->uncore, CSHRDDR3CTL); 81 dev_priv->is_ddr3 = (tmp & CSHRDDR3CTL_DDR3) ? 1 : 0; 82} 83 84static void ilk_detect_mem_freq(struct drm_i915_private *dev_priv) 85{ 86 u16 ddrpll, csipll; 87 88 ddrpll = intel_uncore_read16(&dev_priv->uncore, DDRMPLL1); 89 switch (ddrpll & 0xff) { 90 case 0xc: 91 dev_priv->mem_freq = 800; 92 break; 93 case 0x10: 94 dev_priv->mem_freq = 1066; 95 break; 96 case 0x14: 97 dev_priv->mem_freq = 1333; 98 break; 99 case 0x18: 100 dev_priv->mem_freq = 1600; 101 break; 102 default: 103 drm_dbg(&dev_priv->drm, "unknown memory frequency 0x%02x\n", 104 ddrpll & 0xff); 105 dev_priv->mem_freq = 0; 106 break; 107 } 108 109 csipll = intel_uncore_read16(&dev_priv->uncore, CSIPLL0); 110 switch (csipll & 0x3ff) { 111 case 0x00c: 112 dev_priv->fsb_freq = 3200; 113 break; 114 case 0x00e: 115 dev_priv->fsb_freq = 3733; 116 break; 117 case 0x010: 118 dev_priv->fsb_freq = 4266; 119 break; 120 case 0x012: 121 dev_priv->fsb_freq = 4800; 122 break; 123 case 0x014: 124 dev_priv->fsb_freq = 5333; 125 break; 126 case 0x016: 127 dev_priv->fsb_freq = 5866; 128 break; 129 case 0x018: 130 dev_priv->fsb_freq = 6400; 131 break; 132 default: 133 drm_dbg(&dev_priv->drm, "unknown fsb frequency 0x%04x\n", 134 csipll & 0x3ff); 135 dev_priv->fsb_freq = 0; 136 break; 137 } 138} 139 140static void chv_detect_mem_freq(struct drm_i915_private *i915) 141{ 142 u32 val; 143 144 vlv_iosf_sb_get(i915, BIT(VLV_IOSF_SB_CCK)); 145 val = vlv_cck_read(i915, CCK_FUSE_REG); 146 vlv_iosf_sb_put(i915, BIT(VLV_IOSF_SB_CCK)); 147 148 switch ((val >> 2) & 0x7) { 149 case 3: 150 i915->mem_freq = 2000; 151 break; 152 default: 153 i915->mem_freq = 1600; 154 break; 155 } 156} 157 158static void vlv_detect_mem_freq(struct drm_i915_private *i915) 159{ 160 u32 val; 161 162 vlv_iosf_sb_get(i915, BIT(VLV_IOSF_SB_PUNIT)); 163 val = vlv_punit_read(i915, PUNIT_REG_GPU_FREQ_STS); 164 vlv_iosf_sb_put(i915, BIT(VLV_IOSF_SB_PUNIT)); 165 166 switch ((val >> 6) & 3) { 167 case 0: 168 case 1: 169 i915->mem_freq = 800; 170 break; 171 case 2: 172 i915->mem_freq = 1066; 173 break; 174 case 3: 175 i915->mem_freq = 1333; 176 break; 177 } 178} 179 180static void detect_mem_freq(struct drm_i915_private *i915) 181{ 182 if (IS_PINEVIEW(i915)) 183 pnv_detect_mem_freq(i915); 184 else if (GRAPHICS_VER(i915) == 5) 185 ilk_detect_mem_freq(i915); 186 else if (IS_CHERRYVIEW(i915)) 187 chv_detect_mem_freq(i915); 188 else if (IS_VALLEYVIEW(i915)) 189 vlv_detect_mem_freq(i915); 190 191 if (i915->mem_freq) 192 drm_dbg(&i915->drm, "DDR speed: %d MHz\n", i915->mem_freq); 193} 194 195static int intel_dimm_num_devices(const struct dram_dimm_info *dimm) 196{ 197 return dimm->ranks * 64 / (dimm->width ?: 1); 198} 199 200/* Returns total Gb for the whole DIMM */ 201static int skl_get_dimm_size(u16 val) 202{ 203 return (val & SKL_DRAM_SIZE_MASK) * 8; 204} 205 206static int skl_get_dimm_width(u16 val) 207{ 208 if (skl_get_dimm_size(val) == 0) 209 return 0; 210 211 switch (val & SKL_DRAM_WIDTH_MASK) { 212 case SKL_DRAM_WIDTH_X8: 213 case SKL_DRAM_WIDTH_X16: 214 case SKL_DRAM_WIDTH_X32: 215 val = (val & SKL_DRAM_WIDTH_MASK) >> SKL_DRAM_WIDTH_SHIFT; 216 return 8 << val; 217 default: 218 MISSING_CASE(val); 219 return 0; 220 } 221} 222 223static int skl_get_dimm_ranks(u16 val) 224{ 225 if (skl_get_dimm_size(val) == 0) 226 return 0; 227 228 val = (val & SKL_DRAM_RANK_MASK) >> SKL_DRAM_RANK_SHIFT; 229 230 return val + 1; 231} 232 233/* Returns total Gb for the whole DIMM */ 234static int icl_get_dimm_size(u16 val) 235{ 236 return (val & ICL_DRAM_SIZE_MASK) * 8 / 2; 237} 238 239static int icl_get_dimm_width(u16 val) 240{ 241 if (icl_get_dimm_size(val) == 0) 242 return 0; 243 244 switch (val & ICL_DRAM_WIDTH_MASK) { 245 case ICL_DRAM_WIDTH_X8: 246 case ICL_DRAM_WIDTH_X16: 247 case ICL_DRAM_WIDTH_X32: 248 val = (val & ICL_DRAM_WIDTH_MASK) >> ICL_DRAM_WIDTH_SHIFT; 249 return 8 << val; 250 default: 251 MISSING_CASE(val); 252 return 0; 253 } 254} 255 256static int icl_get_dimm_ranks(u16 val) 257{ 258 if (icl_get_dimm_size(val) == 0) 259 return 0; 260 261 val = (val & ICL_DRAM_RANK_MASK) >> ICL_DRAM_RANK_SHIFT; 262 263 return val + 1; 264} 265 266static bool 267skl_is_16gb_dimm(const struct dram_dimm_info *dimm) 268{ 269 /* Convert total Gb to Gb per DRAM device */ 270 return dimm->size / (intel_dimm_num_devices(dimm) ?: 1) == 16; 271} 272 273static void 274skl_dram_get_dimm_info(struct drm_i915_private *i915, 275 struct dram_dimm_info *dimm, 276 int channel, char dimm_name, u16 val) 277{ 278 if (GRAPHICS_VER(i915) >= 11) { 279 dimm->size = icl_get_dimm_size(val); 280 dimm->width = icl_get_dimm_width(val); 281 dimm->ranks = icl_get_dimm_ranks(val); 282 } else { 283 dimm->size = skl_get_dimm_size(val); 284 dimm->width = skl_get_dimm_width(val); 285 dimm->ranks = skl_get_dimm_ranks(val); 286 } 287 288 drm_dbg_kms(&i915->drm, 289 "CH%u DIMM %c size: %u Gb, width: X%u, ranks: %u, 16Gb DIMMs: %s\n", 290 channel, dimm_name, dimm->size, dimm->width, dimm->ranks, 291 str_yes_no(skl_is_16gb_dimm(dimm))); 292} 293 294static int 295skl_dram_get_channel_info(struct drm_i915_private *i915, 296 struct dram_channel_info *ch, 297 int channel, u32 val) 298{ 299 skl_dram_get_dimm_info(i915, &ch->dimm_l, 300 channel, 'L', val & 0xffff); 301 skl_dram_get_dimm_info(i915, &ch->dimm_s, 302 channel, 'S', val >> 16); 303 304 if (ch->dimm_l.size == 0 && ch->dimm_s.size == 0) { 305 drm_dbg_kms(&i915->drm, "CH%u not populated\n", channel); 306 return -EINVAL; 307 } 308 309 if (ch->dimm_l.ranks == 2 || ch->dimm_s.ranks == 2) 310 ch->ranks = 2; 311 else if (ch->dimm_l.ranks == 1 && ch->dimm_s.ranks == 1) 312 ch->ranks = 2; 313 else 314 ch->ranks = 1; 315 316 ch->is_16gb_dimm = skl_is_16gb_dimm(&ch->dimm_l) || 317 skl_is_16gb_dimm(&ch->dimm_s); 318 319 drm_dbg_kms(&i915->drm, "CH%u ranks: %u, 16Gb DIMMs: %s\n", 320 channel, ch->ranks, str_yes_no(ch->is_16gb_dimm)); 321 322 return 0; 323} 324 325static bool 326intel_is_dram_symmetric(const struct dram_channel_info *ch0, 327 const struct dram_channel_info *ch1) 328{ 329 return !memcmp(ch0, ch1, sizeof(*ch0)) && 330 (ch0->dimm_s.size == 0 || 331 !memcmp(&ch0->dimm_l, &ch0->dimm_s, sizeof(ch0->dimm_l))); 332} 333 334static int 335skl_dram_get_channels_info(struct drm_i915_private *i915) 336{ 337 struct dram_info *dram_info = &i915->dram_info; 338 struct dram_channel_info ch0 = {}, ch1 = {}; 339 u32 val; 340 int ret; 341 342 val = intel_uncore_read(&i915->uncore, 343 SKL_MAD_DIMM_CH0_0_0_0_MCHBAR_MCMAIN); 344 ret = skl_dram_get_channel_info(i915, &ch0, 0, val); 345 if (ret == 0) 346 dram_info->num_channels++; 347 348 val = intel_uncore_read(&i915->uncore, 349 SKL_MAD_DIMM_CH1_0_0_0_MCHBAR_MCMAIN); 350 ret = skl_dram_get_channel_info(i915, &ch1, 1, val); 351 if (ret == 0) 352 dram_info->num_channels++; 353 354 if (dram_info->num_channels == 0) { 355 drm_info(&i915->drm, "Number of memory channels is zero\n"); 356 return -EINVAL; 357 } 358 359 if (ch0.ranks == 0 && ch1.ranks == 0) { 360 drm_info(&i915->drm, "couldn't get memory rank information\n"); 361 return -EINVAL; 362 } 363 364 dram_info->wm_lv_0_adjust_needed = ch0.is_16gb_dimm || ch1.is_16gb_dimm; 365 366 dram_info->symmetric_memory = intel_is_dram_symmetric(&ch0, &ch1); 367 368 drm_dbg_kms(&i915->drm, "Memory configuration is symmetric? %s\n", 369 str_yes_no(dram_info->symmetric_memory)); 370 371 return 0; 372} 373 374static enum intel_dram_type 375skl_get_dram_type(struct drm_i915_private *i915) 376{ 377 u32 val; 378 379 val = intel_uncore_read(&i915->uncore, 380 SKL_MAD_INTER_CHANNEL_0_0_0_MCHBAR_MCMAIN); 381 382 switch (val & SKL_DRAM_DDR_TYPE_MASK) { 383 case SKL_DRAM_DDR_TYPE_DDR3: 384 return INTEL_DRAM_DDR3; 385 case SKL_DRAM_DDR_TYPE_DDR4: 386 return INTEL_DRAM_DDR4; 387 case SKL_DRAM_DDR_TYPE_LPDDR3: 388 return INTEL_DRAM_LPDDR3; 389 case SKL_DRAM_DDR_TYPE_LPDDR4: 390 return INTEL_DRAM_LPDDR4; 391 default: 392 MISSING_CASE(val); 393 return INTEL_DRAM_UNKNOWN; 394 } 395} 396 397static int 398skl_get_dram_info(struct drm_i915_private *i915) 399{ 400 struct dram_info *dram_info = &i915->dram_info; 401 int ret; 402 403 dram_info->type = skl_get_dram_type(i915); 404 drm_dbg_kms(&i915->drm, "DRAM type: %s\n", 405 intel_dram_type_str(dram_info->type)); 406 407 ret = skl_dram_get_channels_info(i915); 408 if (ret) 409 return ret; 410 411 return 0; 412} 413 414/* Returns Gb per DRAM device */ 415static int bxt_get_dimm_size(u32 val) 416{ 417 switch (val & BXT_DRAM_SIZE_MASK) { 418 case BXT_DRAM_SIZE_4GBIT: 419 return 4; 420 case BXT_DRAM_SIZE_6GBIT: 421 return 6; 422 case BXT_DRAM_SIZE_8GBIT: 423 return 8; 424 case BXT_DRAM_SIZE_12GBIT: 425 return 12; 426 case BXT_DRAM_SIZE_16GBIT: 427 return 16; 428 default: 429 MISSING_CASE(val); 430 return 0; 431 } 432} 433 434static int bxt_get_dimm_width(u32 val) 435{ 436 if (!bxt_get_dimm_size(val)) 437 return 0; 438 439 val = (val & BXT_DRAM_WIDTH_MASK) >> BXT_DRAM_WIDTH_SHIFT; 440 441 return 8 << val; 442} 443 444static int bxt_get_dimm_ranks(u32 val) 445{ 446 if (!bxt_get_dimm_size(val)) 447 return 0; 448 449 switch (val & BXT_DRAM_RANK_MASK) { 450 case BXT_DRAM_RANK_SINGLE: 451 return 1; 452 case BXT_DRAM_RANK_DUAL: 453 return 2; 454 default: 455 MISSING_CASE(val); 456 return 0; 457 } 458} 459 460static enum intel_dram_type bxt_get_dimm_type(u32 val) 461{ 462 if (!bxt_get_dimm_size(val)) 463 return INTEL_DRAM_UNKNOWN; 464 465 switch (val & BXT_DRAM_TYPE_MASK) { 466 case BXT_DRAM_TYPE_DDR3: 467 return INTEL_DRAM_DDR3; 468 case BXT_DRAM_TYPE_LPDDR3: 469 return INTEL_DRAM_LPDDR3; 470 case BXT_DRAM_TYPE_DDR4: 471 return INTEL_DRAM_DDR4; 472 case BXT_DRAM_TYPE_LPDDR4: 473 return INTEL_DRAM_LPDDR4; 474 default: 475 MISSING_CASE(val); 476 return INTEL_DRAM_UNKNOWN; 477 } 478} 479 480static void bxt_get_dimm_info(struct dram_dimm_info *dimm, u32 val) 481{ 482 dimm->width = bxt_get_dimm_width(val); 483 dimm->ranks = bxt_get_dimm_ranks(val); 484 485 /* 486 * Size in register is Gb per DRAM device. Convert to total 487 * Gb to match the way we report this for non-LP platforms. 488 */ 489 dimm->size = bxt_get_dimm_size(val) * intel_dimm_num_devices(dimm); 490} 491 492static int bxt_get_dram_info(struct drm_i915_private *i915) 493{ 494 struct dram_info *dram_info = &i915->dram_info; 495 u32 val; 496 u8 valid_ranks = 0; 497 int i; 498 499 /* 500 * Now read each DUNIT8/9/10/11 to check the rank of each dimms. 501 */ 502 for (i = BXT_D_CR_DRP0_DUNIT_START; i <= BXT_D_CR_DRP0_DUNIT_END; i++) { 503 struct dram_dimm_info dimm; 504 enum intel_dram_type type; 505 506 val = intel_uncore_read(&i915->uncore, BXT_D_CR_DRP0_DUNIT(i)); 507 if (val == 0xFFFFFFFF) 508 continue; 509 510 dram_info->num_channels++; 511 512 bxt_get_dimm_info(&dimm, val); 513 type = bxt_get_dimm_type(val); 514 515 drm_WARN_ON(&i915->drm, type != INTEL_DRAM_UNKNOWN && 516 dram_info->type != INTEL_DRAM_UNKNOWN && 517 dram_info->type != type); 518 519 drm_dbg_kms(&i915->drm, 520 "CH%u DIMM size: %u Gb, width: X%u, ranks: %u, type: %s\n", 521 i - BXT_D_CR_DRP0_DUNIT_START, 522 dimm.size, dimm.width, dimm.ranks, 523 intel_dram_type_str(type)); 524 525 if (valid_ranks == 0) 526 valid_ranks = dimm.ranks; 527 528 if (type != INTEL_DRAM_UNKNOWN) 529 dram_info->type = type; 530 } 531 532 if (dram_info->type == INTEL_DRAM_UNKNOWN || valid_ranks == 0) { 533 drm_info(&i915->drm, "couldn't get memory information\n"); 534 return -EINVAL; 535 } 536 537 return 0; 538} 539 540static int icl_pcode_read_mem_global_info(struct drm_i915_private *dev_priv) 541{ 542 struct dram_info *dram_info = &dev_priv->dram_info; 543 u32 val = 0; 544 int ret; 545 546 ret = snb_pcode_read(&dev_priv->uncore, ICL_PCODE_MEM_SUBSYSYSTEM_INFO | 547 ICL_PCODE_MEM_SS_READ_GLOBAL_INFO, &val, NULL); 548 if (ret) 549 return ret; 550 551 if (GRAPHICS_VER(dev_priv) == 12) { 552 switch (val & 0xf) { 553 case 0: 554 dram_info->type = INTEL_DRAM_DDR4; 555 break; 556 case 1: 557 dram_info->type = INTEL_DRAM_DDR5; 558 break; 559 case 2: 560 dram_info->type = INTEL_DRAM_LPDDR5; 561 break; 562 case 3: 563 dram_info->type = INTEL_DRAM_LPDDR4; 564 break; 565 case 4: 566 dram_info->type = INTEL_DRAM_DDR3; 567 break; 568 case 5: 569 dram_info->type = INTEL_DRAM_LPDDR3; 570 break; 571 default: 572 MISSING_CASE(val & 0xf); 573 return -EINVAL; 574 } 575 } else { 576 switch (val & 0xf) { 577 case 0: 578 dram_info->type = INTEL_DRAM_DDR4; 579 break; 580 case 1: 581 dram_info->type = INTEL_DRAM_DDR3; 582 break; 583 case 2: 584 dram_info->type = INTEL_DRAM_LPDDR3; 585 break; 586 case 3: 587 dram_info->type = INTEL_DRAM_LPDDR4; 588 break; 589 default: 590 MISSING_CASE(val & 0xf); 591 return -EINVAL; 592 } 593 } 594 595 dram_info->num_channels = (val & 0xf0) >> 4; 596 dram_info->num_qgv_points = (val & 0xf00) >> 8; 597 dram_info->num_psf_gv_points = (val & 0x3000) >> 12; 598 599 return 0; 600} 601 602static int gen11_get_dram_info(struct drm_i915_private *i915) 603{ 604 int ret = skl_get_dram_info(i915); 605 606 if (ret) 607 return ret; 608 609 return icl_pcode_read_mem_global_info(i915); 610} 611 612static int gen12_get_dram_info(struct drm_i915_private *i915) 613{ 614 i915->dram_info.wm_lv_0_adjust_needed = false; 615 616 return icl_pcode_read_mem_global_info(i915); 617} 618 619static int xelpdp_get_dram_info(struct drm_i915_private *i915) 620{ 621 u32 val = intel_uncore_read(&i915->uncore, MTL_MEM_SS_INFO_GLOBAL); 622 struct dram_info *dram_info = &i915->dram_info; 623 624 switch (REG_FIELD_GET(MTL_DDR_TYPE_MASK, val)) { 625 case 0: 626 dram_info->type = INTEL_DRAM_DDR4; 627 break; 628 case 1: 629 dram_info->type = INTEL_DRAM_DDR5; 630 break; 631 case 2: 632 dram_info->type = INTEL_DRAM_LPDDR5; 633 break; 634 case 3: 635 dram_info->type = INTEL_DRAM_LPDDR4; 636 break; 637 case 4: 638 dram_info->type = INTEL_DRAM_DDR3; 639 break; 640 case 5: 641 dram_info->type = INTEL_DRAM_LPDDR3; 642 break; 643 default: 644 MISSING_CASE(val); 645 return -EINVAL; 646 } 647 648 dram_info->num_channels = REG_FIELD_GET(MTL_N_OF_POPULATED_CH_MASK, val); 649 dram_info->num_qgv_points = REG_FIELD_GET(MTL_N_OF_ENABLED_QGV_POINTS_MASK, val); 650 /* PSF GV points not supported in D14+ */ 651 652 return 0; 653} 654 655void intel_dram_detect(struct drm_i915_private *i915) 656{ 657 struct dram_info *dram_info = &i915->dram_info; 658 int ret; 659 660 detect_mem_freq(i915); 661 662 if (GRAPHICS_VER(i915) < 9 || IS_DG2(i915) || !HAS_DISPLAY(i915)) 663 return; 664 665 /* 666 * Assume level 0 watermark latency adjustment is needed until proven 667 * otherwise, this w/a is not needed by bxt/glk. 668 */ 669 dram_info->wm_lv_0_adjust_needed = !IS_GEN9_LP(i915); 670 671 if (DISPLAY_VER(i915) >= 14) 672 ret = xelpdp_get_dram_info(i915); 673 else if (GRAPHICS_VER(i915) >= 12) 674 ret = gen12_get_dram_info(i915); 675 else if (GRAPHICS_VER(i915) >= 11) 676 ret = gen11_get_dram_info(i915); 677 else if (IS_GEN9_LP(i915)) 678 ret = bxt_get_dram_info(i915); 679 else 680 ret = skl_get_dram_info(i915); 681 if (ret) 682 return; 683 684 drm_dbg_kms(&i915->drm, "Num qgv points %u\n", dram_info->num_qgv_points); 685 686 drm_dbg_kms(&i915->drm, "DRAM channels: %u\n", dram_info->num_channels); 687 688 drm_dbg_kms(&i915->drm, "Watermark level 0 adjustment needed: %s\n", 689 str_yes_no(dram_info->wm_lv_0_adjust_needed)); 690} 691 692static u32 gen9_edram_size_mb(struct drm_i915_private *i915, u32 cap) 693{ 694 static const u8 ways[8] = { 4, 8, 12, 16, 16, 16, 16, 16 }; 695 static const u8 sets[4] = { 1, 1, 2, 2 }; 696 697 return EDRAM_NUM_BANKS(cap) * 698 ways[EDRAM_WAYS_IDX(cap)] * 699 sets[EDRAM_SETS_IDX(cap)]; 700} 701 702void intel_dram_edram_detect(struct drm_i915_private *i915) 703{ 704 u32 edram_cap = 0; 705 706 if (!(IS_HASWELL(i915) || IS_BROADWELL(i915) || GRAPHICS_VER(i915) >= 9)) 707 return; 708 709 edram_cap = intel_uncore_read_fw(&i915->uncore, HSW_EDRAM_CAP); 710 711 /* NB: We can't write IDICR yet because we don't have gt funcs set up */ 712 713 if (!(edram_cap & EDRAM_ENABLED)) 714 return; 715 716 /* 717 * The needed capability bits for size calculation are not there with 718 * pre gen9 so return 128MB always. 719 */ 720 if (GRAPHICS_VER(i915) < 9) 721 i915->edram_size_mb = 128; 722 else 723 i915->edram_size_mb = gen9_edram_size_mb(i915, edram_cap); 724 725 drm_info(&i915->drm, "Found %uMB of eDRAM\n", i915->edram_size_mb); 726} 727