1/* 2 * Copyright �� 2013 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21 * DEALINGS IN THE SOFTWARE. 22 * 23 * Authors: 24 * Shobhit Kumar <shobhit.kumar@intel.com> 25 * Yogesh Mohan Marimuthu <yogesh.mohan.marimuthu@intel.com> 26 */ 27 28#include <linux/kernel.h> 29#include <linux/string_helpers.h> 30 31#include "i915_drv.h" 32#include "intel_de.h" 33#include "intel_display_types.h" 34#include "intel_dsi.h" 35#include "vlv_dsi_pll.h" 36#include "vlv_dsi_pll_regs.h" 37#include "vlv_sideband.h" 38 39static const u16 lfsr_converts[] = { 40 426, 469, 234, 373, 442, 221, 110, 311, 411, /* 62 - 70 */ 41 461, 486, 243, 377, 188, 350, 175, 343, 427, 213, /* 71 - 80 */ 42 106, 53, 282, 397, 454, 227, 113, 56, 284, 142, /* 81 - 90 */ 43 71, 35, 273, 136, 324, 418, 465, 488, 500, 506 /* 91 - 100 */ 44}; 45 46/* Get DSI clock from pixel clock */ 47static u32 dsi_clk_from_pclk(u32 pclk, enum mipi_dsi_pixel_format fmt, 48 int lane_count) 49{ 50 u32 dsi_clk_khz; 51 u32 bpp = mipi_dsi_pixel_format_to_bpp(fmt); 52 53 /* DSI data rate = pixel clock * bits per pixel / lane count 54 pixel clock is converted from KHz to Hz */ 55 dsi_clk_khz = DIV_ROUND_CLOSEST(pclk * bpp, lane_count); 56 57 return dsi_clk_khz; 58} 59 60static int dsi_calc_mnp(struct drm_i915_private *dev_priv, 61 struct intel_crtc_state *config, 62 int target_dsi_clk) 63{ 64 unsigned int m_min, m_max, p_min = 2, p_max = 6; 65 unsigned int m, n, p; 66 unsigned int calc_m, calc_p; 67 int delta, ref_clk; 68 69 /* target_dsi_clk is expected in kHz */ 70 if (target_dsi_clk < 300000 || target_dsi_clk > 1150000) { 71 drm_err(&dev_priv->drm, "DSI CLK Out of Range\n"); 72 return -ECHRNG; 73 } 74 75 if (IS_CHERRYVIEW(dev_priv)) { 76 ref_clk = 100000; 77 n = 4; 78 m_min = 70; 79 m_max = 96; 80 } else { 81 ref_clk = 25000; 82 n = 1; 83 m_min = 62; 84 m_max = 92; 85 } 86 87 calc_p = p_min; 88 calc_m = m_min; 89 delta = abs(target_dsi_clk - (m_min * ref_clk) / (p_min * n)); 90 91 for (m = m_min; m <= m_max && delta; m++) { 92 for (p = p_min; p <= p_max && delta; p++) { 93 /* 94 * Find the optimal m and p divisors with minimal delta 95 * +/- the required clock 96 */ 97 int calc_dsi_clk = (m * ref_clk) / (p * n); 98 int d = abs(target_dsi_clk - calc_dsi_clk); 99 if (d < delta) { 100 delta = d; 101 calc_m = m; 102 calc_p = p; 103 } 104 } 105 } 106 107 /* register has log2(N1), this works fine for powers of two */ 108 config->dsi_pll.ctrl = 1 << (DSI_PLL_P1_POST_DIV_SHIFT + calc_p - 2); 109 config->dsi_pll.div = 110 (ffs(n) - 1) << DSI_PLL_N1_DIV_SHIFT | 111 (u32)lfsr_converts[calc_m - 62] << DSI_PLL_M1_DIV_SHIFT; 112 113 return 0; 114} 115 116static int vlv_dsi_pclk(struct intel_encoder *encoder, 117 struct intel_crtc_state *config) 118{ 119 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 120 struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder); 121 int bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format); 122 u32 dsi_clock; 123 u32 pll_ctl, pll_div; 124 u32 m = 0, p = 0, n; 125 int refclk = IS_CHERRYVIEW(dev_priv) ? 100000 : 25000; 126 int i; 127 128 pll_ctl = config->dsi_pll.ctrl; 129 pll_div = config->dsi_pll.div; 130 131 /* mask out other bits and extract the P1 divisor */ 132 pll_ctl &= DSI_PLL_P1_POST_DIV_MASK; 133 pll_ctl = pll_ctl >> (DSI_PLL_P1_POST_DIV_SHIFT - 2); 134 135 /* N1 divisor */ 136 n = (pll_div & DSI_PLL_N1_DIV_MASK) >> DSI_PLL_N1_DIV_SHIFT; 137 n = 1 << n; /* register has log2(N1) */ 138 139 /* mask out the other bits and extract the M1 divisor */ 140 pll_div &= DSI_PLL_M1_DIV_MASK; 141 pll_div = pll_div >> DSI_PLL_M1_DIV_SHIFT; 142 143 while (pll_ctl) { 144 pll_ctl = pll_ctl >> 1; 145 p++; 146 } 147 p--; 148 149 if (!p) { 150 drm_err(&dev_priv->drm, "wrong P1 divisor\n"); 151 return 0; 152 } 153 154 for (i = 0; i < ARRAY_SIZE(lfsr_converts); i++) { 155 if (lfsr_converts[i] == pll_div) 156 break; 157 } 158 159 if (i == ARRAY_SIZE(lfsr_converts)) { 160 drm_err(&dev_priv->drm, "wrong m_seed programmed\n"); 161 return 0; 162 } 163 164 m = i + 62; 165 166 dsi_clock = (m * refclk) / (p * n); 167 168 return DIV_ROUND_CLOSEST(dsi_clock * intel_dsi->lane_count, bpp); 169} 170 171/* 172 * XXX: The muxing and gating is hard coded for now. Need to add support for 173 * sharing PLLs with two DSI outputs. 174 */ 175int vlv_dsi_pll_compute(struct intel_encoder *encoder, 176 struct intel_crtc_state *config) 177{ 178 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 179 struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder); 180 int pclk, dsi_clk, ret; 181 182 dsi_clk = dsi_clk_from_pclk(intel_dsi->pclk, intel_dsi->pixel_format, 183 intel_dsi->lane_count); 184 185 ret = dsi_calc_mnp(dev_priv, config, dsi_clk); 186 if (ret) { 187 drm_dbg_kms(&dev_priv->drm, "dsi_calc_mnp failed\n"); 188 return ret; 189 } 190 191 if (intel_dsi->ports & (1 << PORT_A)) 192 config->dsi_pll.ctrl |= DSI_PLL_CLK_GATE_DSI0_DSIPLL; 193 194 if (intel_dsi->ports & (1 << PORT_C)) 195 config->dsi_pll.ctrl |= DSI_PLL_CLK_GATE_DSI1_DSIPLL; 196 197 config->dsi_pll.ctrl |= DSI_PLL_VCO_EN; 198 199 drm_dbg_kms(&dev_priv->drm, "dsi pll div %08x, ctrl %08x\n", 200 config->dsi_pll.div, config->dsi_pll.ctrl); 201 202 pclk = vlv_dsi_pclk(encoder, config); 203 config->port_clock = pclk; 204 205 /* FIXME definitely not right for burst/cmd mode/pixel overlap */ 206 config->hw.adjusted_mode.crtc_clock = pclk; 207 if (intel_dsi->dual_link) 208 config->hw.adjusted_mode.crtc_clock *= 2; 209 210 return 0; 211} 212 213void vlv_dsi_pll_enable(struct intel_encoder *encoder, 214 const struct intel_crtc_state *config) 215{ 216 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 217 218 drm_dbg_kms(&dev_priv->drm, "\n"); 219 220 vlv_cck_get(dev_priv); 221 222 vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, 0); 223 vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_DIVIDER, config->dsi_pll.div); 224 vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, 225 config->dsi_pll.ctrl & ~DSI_PLL_VCO_EN); 226 227 /* wait at least 0.5 us after ungating before enabling VCO, 228 * allow hrtimer subsystem optimization by relaxing timing 229 */ 230 usleep_range(10, 50); 231 232 vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, config->dsi_pll.ctrl); 233 234 if (wait_for(vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL) & 235 DSI_PLL_LOCK, 20)) { 236 237 vlv_cck_put(dev_priv); 238 drm_err(&dev_priv->drm, "DSI PLL lock failed\n"); 239 return; 240 } 241 vlv_cck_put(dev_priv); 242 243 drm_dbg_kms(&dev_priv->drm, "DSI PLL locked\n"); 244} 245 246void vlv_dsi_pll_disable(struct intel_encoder *encoder) 247{ 248 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 249 u32 tmp; 250 251 drm_dbg_kms(&dev_priv->drm, "\n"); 252 253 vlv_cck_get(dev_priv); 254 255 tmp = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL); 256 tmp &= ~DSI_PLL_VCO_EN; 257 tmp |= DSI_PLL_LDO_GATE; 258 vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, tmp); 259 260 vlv_cck_put(dev_priv); 261} 262 263bool bxt_dsi_pll_is_enabled(struct drm_i915_private *dev_priv) 264{ 265 bool enabled; 266 u32 val; 267 u32 mask; 268 269 mask = BXT_DSI_PLL_DO_ENABLE | BXT_DSI_PLL_LOCKED; 270 val = intel_de_read(dev_priv, BXT_DSI_PLL_ENABLE); 271 enabled = (val & mask) == mask; 272 273 if (!enabled) 274 return false; 275 276 /* 277 * Dividers must be programmed with valid values. As per BSEPC, for 278 * GEMINLAKE only PORT A divider values are checked while for BXT 279 * both divider values are validated. Check this here for 280 * paranoia, since BIOS is known to misconfigure PLLs in this way at 281 * times, and since accessing DSI registers with invalid dividers 282 * causes a system hang. 283 */ 284 val = intel_de_read(dev_priv, BXT_DSI_PLL_CTL); 285 if (IS_GEMINILAKE(dev_priv)) { 286 if (!(val & BXT_DSIA_16X_MASK)) { 287 drm_dbg(&dev_priv->drm, 288 "Invalid PLL divider (%08x)\n", val); 289 enabled = false; 290 } 291 } else { 292 if (!(val & BXT_DSIA_16X_MASK) || !(val & BXT_DSIC_16X_MASK)) { 293 drm_dbg(&dev_priv->drm, 294 "Invalid PLL divider (%08x)\n", val); 295 enabled = false; 296 } 297 } 298 299 return enabled; 300} 301 302void bxt_dsi_pll_disable(struct intel_encoder *encoder) 303{ 304 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 305 306 drm_dbg_kms(&dev_priv->drm, "\n"); 307 308 intel_de_rmw(dev_priv, BXT_DSI_PLL_ENABLE, BXT_DSI_PLL_DO_ENABLE, 0); 309 310 /* 311 * PLL lock should deassert within 200us. 312 * Wait up to 1ms before timing out. 313 */ 314 if (intel_de_wait_for_clear(dev_priv, BXT_DSI_PLL_ENABLE, 315 BXT_DSI_PLL_LOCKED, 1)) 316 drm_err(&dev_priv->drm, 317 "Timeout waiting for PLL lock deassertion\n"); 318} 319 320u32 vlv_dsi_get_pclk(struct intel_encoder *encoder, 321 struct intel_crtc_state *config) 322{ 323 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 324 u32 pll_ctl, pll_div; 325 326 drm_dbg_kms(&dev_priv->drm, "\n"); 327 328 vlv_cck_get(dev_priv); 329 pll_ctl = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL); 330 pll_div = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_DIVIDER); 331 vlv_cck_put(dev_priv); 332 333 config->dsi_pll.ctrl = pll_ctl & ~DSI_PLL_LOCK; 334 config->dsi_pll.div = pll_div; 335 336 return vlv_dsi_pclk(encoder, config); 337} 338 339static int bxt_dsi_pclk(struct intel_encoder *encoder, 340 const struct intel_crtc_state *config) 341{ 342 struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder); 343 int bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format); 344 u32 dsi_ratio, dsi_clk; 345 346 dsi_ratio = config->dsi_pll.ctrl & BXT_DSI_PLL_RATIO_MASK; 347 dsi_clk = (dsi_ratio * BXT_REF_CLOCK_KHZ) / 2; 348 349 return DIV_ROUND_CLOSEST(dsi_clk * intel_dsi->lane_count, bpp); 350} 351 352u32 bxt_dsi_get_pclk(struct intel_encoder *encoder, 353 struct intel_crtc_state *config) 354{ 355 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 356 u32 pclk; 357 358 config->dsi_pll.ctrl = intel_de_read(dev_priv, BXT_DSI_PLL_CTL); 359 360 pclk = bxt_dsi_pclk(encoder, config); 361 362 drm_dbg(&dev_priv->drm, "Calculated pclk=%u\n", pclk); 363 return pclk; 364} 365 366void vlv_dsi_reset_clocks(struct intel_encoder *encoder, enum port port) 367{ 368 u32 temp; 369 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 370 struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder); 371 372 temp = intel_de_read(dev_priv, MIPI_CTRL(port)); 373 temp &= ~ESCAPE_CLOCK_DIVIDER_MASK; 374 intel_de_write(dev_priv, MIPI_CTRL(port), 375 temp | intel_dsi->escape_clk_div << ESCAPE_CLOCK_DIVIDER_SHIFT); 376} 377 378static void glk_dsi_program_esc_clock(struct drm_device *dev, 379 const struct intel_crtc_state *config) 380{ 381 struct drm_i915_private *dev_priv = to_i915(dev); 382 u32 dsi_rate = 0; 383 u32 pll_ratio = 0; 384 u32 ddr_clk = 0; 385 u32 div1_value = 0; 386 u32 div2_value = 0; 387 u32 txesc1_div = 0; 388 u32 txesc2_div = 0; 389 390 pll_ratio = config->dsi_pll.ctrl & BXT_DSI_PLL_RATIO_MASK; 391 392 dsi_rate = (BXT_REF_CLOCK_KHZ * pll_ratio) / 2; 393 394 ddr_clk = dsi_rate / 2; 395 396 /* Variable divider value */ 397 div1_value = DIV_ROUND_CLOSEST(ddr_clk, 20000); 398 399 /* Calculate TXESC1 divider */ 400 if (div1_value <= 10) 401 txesc1_div = div1_value; 402 else if ((div1_value > 10) && (div1_value <= 20)) 403 txesc1_div = DIV_ROUND_UP(div1_value, 2); 404 else if ((div1_value > 20) && (div1_value <= 30)) 405 txesc1_div = DIV_ROUND_UP(div1_value, 4); 406 else if ((div1_value > 30) && (div1_value <= 40)) 407 txesc1_div = DIV_ROUND_UP(div1_value, 6); 408 else if ((div1_value > 40) && (div1_value <= 50)) 409 txesc1_div = DIV_ROUND_UP(div1_value, 8); 410 else 411 txesc1_div = 10; 412 413 /* Calculate TXESC2 divider */ 414 div2_value = DIV_ROUND_UP(div1_value, txesc1_div); 415 416 txesc2_div = min_t(u32, div2_value, 10); 417 418 intel_de_write(dev_priv, MIPIO_TXESC_CLK_DIV1, 419 (1 << (txesc1_div - 1)) & GLK_TX_ESC_CLK_DIV1_MASK); 420 intel_de_write(dev_priv, MIPIO_TXESC_CLK_DIV2, 421 (1 << (txesc2_div - 1)) & GLK_TX_ESC_CLK_DIV2_MASK); 422} 423 424/* Program BXT Mipi clocks and dividers */ 425static void bxt_dsi_program_clocks(struct drm_device *dev, enum port port, 426 const struct intel_crtc_state *config) 427{ 428 struct drm_i915_private *dev_priv = to_i915(dev); 429 u32 tmp; 430 u32 dsi_rate = 0; 431 u32 pll_ratio = 0; 432 u32 rx_div; 433 u32 tx_div; 434 u32 rx_div_upper; 435 u32 rx_div_lower; 436 u32 mipi_8by3_divider; 437 438 /* Clear old configurations */ 439 tmp = intel_de_read(dev_priv, BXT_MIPI_CLOCK_CTL); 440 tmp &= ~(BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port)); 441 tmp &= ~(BXT_MIPI_RX_ESCLK_UPPER_FIXDIV_MASK(port)); 442 tmp &= ~(BXT_MIPI_8X_BY3_DIVIDER_MASK(port)); 443 tmp &= ~(BXT_MIPI_RX_ESCLK_LOWER_FIXDIV_MASK(port)); 444 445 /* Get the current DSI rate(actual) */ 446 pll_ratio = config->dsi_pll.ctrl & BXT_DSI_PLL_RATIO_MASK; 447 dsi_rate = (BXT_REF_CLOCK_KHZ * pll_ratio) / 2; 448 449 /* 450 * tx clock should be <= 20MHz and the div value must be 451 * subtracted by 1 as per bspec 452 */ 453 tx_div = DIV_ROUND_UP(dsi_rate, 20000) - 1; 454 /* 455 * rx clock should be <= 150MHz and the div value must be 456 * subtracted by 1 as per bspec 457 */ 458 rx_div = DIV_ROUND_UP(dsi_rate, 150000) - 1; 459 460 /* 461 * rx divider value needs to be updated in the 462 * two differnt bit fields in the register hence splitting the 463 * rx divider value accordingly 464 */ 465 rx_div_lower = rx_div & RX_DIVIDER_BIT_1_2; 466 rx_div_upper = (rx_div & RX_DIVIDER_BIT_3_4) >> 2; 467 468 mipi_8by3_divider = 0x2; 469 470 tmp |= BXT_MIPI_8X_BY3_DIVIDER(port, mipi_8by3_divider); 471 tmp |= BXT_MIPI_TX_ESCLK_DIVIDER(port, tx_div); 472 tmp |= BXT_MIPI_RX_ESCLK_LOWER_DIVIDER(port, rx_div_lower); 473 tmp |= BXT_MIPI_RX_ESCLK_UPPER_DIVIDER(port, rx_div_upper); 474 475 intel_de_write(dev_priv, BXT_MIPI_CLOCK_CTL, tmp); 476} 477 478int bxt_dsi_pll_compute(struct intel_encoder *encoder, 479 struct intel_crtc_state *config) 480{ 481 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 482 struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder); 483 u8 dsi_ratio, dsi_ratio_min, dsi_ratio_max; 484 u32 dsi_clk; 485 int pclk; 486 487 dsi_clk = dsi_clk_from_pclk(intel_dsi->pclk, intel_dsi->pixel_format, 488 intel_dsi->lane_count); 489 490 /* 491 * From clock diagram, to get PLL ratio divider, divide double of DSI 492 * link rate (i.e., 2*8x=16x frequency value) by ref clock. Make sure to 493 * round 'up' the result 494 */ 495 dsi_ratio = DIV_ROUND_UP(dsi_clk * 2, BXT_REF_CLOCK_KHZ); 496 497 if (IS_BROXTON(dev_priv)) { 498 dsi_ratio_min = BXT_DSI_PLL_RATIO_MIN; 499 dsi_ratio_max = BXT_DSI_PLL_RATIO_MAX; 500 } else { 501 dsi_ratio_min = GLK_DSI_PLL_RATIO_MIN; 502 dsi_ratio_max = GLK_DSI_PLL_RATIO_MAX; 503 } 504 505 if (dsi_ratio < dsi_ratio_min || dsi_ratio > dsi_ratio_max) { 506 drm_err(&dev_priv->drm, 507 "Can't get a suitable ratio from DSI PLL ratios\n"); 508 return -ECHRNG; 509 } else 510 drm_dbg_kms(&dev_priv->drm, "DSI PLL calculation is Done!!\n"); 511 512 /* 513 * Program DSI ratio and Select MIPIC and MIPIA PLL output as 8x 514 * Spec says both have to be programmed, even if one is not getting 515 * used. Configure MIPI_CLOCK_CTL dividers in modeset 516 */ 517 config->dsi_pll.ctrl = dsi_ratio | BXT_DSIA_16X_BY2 | BXT_DSIC_16X_BY2; 518 519 /* As per recommendation from hardware team, 520 * Prog PVD ratio =1 if dsi ratio <= 50 521 */ 522 if (IS_BROXTON(dev_priv) && dsi_ratio <= 50) 523 config->dsi_pll.ctrl |= BXT_DSI_PLL_PVD_RATIO_1; 524 525 pclk = bxt_dsi_pclk(encoder, config); 526 config->port_clock = pclk; 527 528 /* FIXME definitely not right for burst/cmd mode/pixel overlap */ 529 config->hw.adjusted_mode.crtc_clock = pclk; 530 if (intel_dsi->dual_link) 531 config->hw.adjusted_mode.crtc_clock *= 2; 532 533 return 0; 534} 535 536void bxt_dsi_pll_enable(struct intel_encoder *encoder, 537 const struct intel_crtc_state *config) 538{ 539 struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); 540 struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder); 541 enum port port; 542 543 drm_dbg_kms(&dev_priv->drm, "\n"); 544 545 /* Configure PLL vales */ 546 intel_de_write(dev_priv, BXT_DSI_PLL_CTL, config->dsi_pll.ctrl); 547 intel_de_posting_read(dev_priv, BXT_DSI_PLL_CTL); 548 549 /* Program TX, RX, Dphy clocks */ 550 if (IS_BROXTON(dev_priv)) { 551 for_each_dsi_port(port, intel_dsi->ports) 552 bxt_dsi_program_clocks(encoder->base.dev, port, config); 553 } else { 554 glk_dsi_program_esc_clock(encoder->base.dev, config); 555 } 556 557 /* Enable DSI PLL */ 558 intel_de_rmw(dev_priv, BXT_DSI_PLL_ENABLE, 0, BXT_DSI_PLL_DO_ENABLE); 559 560 /* Timeout and fail if PLL not locked */ 561 if (intel_de_wait_for_set(dev_priv, BXT_DSI_PLL_ENABLE, 562 BXT_DSI_PLL_LOCKED, 1)) { 563 drm_err(&dev_priv->drm, 564 "Timed out waiting for DSI PLL to lock\n"); 565 return; 566 } 567 568 drm_dbg_kms(&dev_priv->drm, "DSI PLL locked\n"); 569} 570 571void bxt_dsi_reset_clocks(struct intel_encoder *encoder, enum port port) 572{ 573 u32 tmp; 574 struct drm_device *dev = encoder->base.dev; 575 struct drm_i915_private *dev_priv = to_i915(dev); 576 577 /* Clear old configurations */ 578 if (IS_BROXTON(dev_priv)) { 579 tmp = intel_de_read(dev_priv, BXT_MIPI_CLOCK_CTL); 580 tmp &= ~(BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port)); 581 tmp &= ~(BXT_MIPI_RX_ESCLK_UPPER_FIXDIV_MASK(port)); 582 tmp &= ~(BXT_MIPI_8X_BY3_DIVIDER_MASK(port)); 583 tmp &= ~(BXT_MIPI_RX_ESCLK_LOWER_FIXDIV_MASK(port)); 584 intel_de_write(dev_priv, BXT_MIPI_CLOCK_CTL, tmp); 585 } else { 586 intel_de_rmw(dev_priv, MIPIO_TXESC_CLK_DIV1, GLK_TX_ESC_CLK_DIV1_MASK, 0); 587 588 intel_de_rmw(dev_priv, MIPIO_TXESC_CLK_DIV2, GLK_TX_ESC_CLK_DIV2_MASK, 0); 589 } 590 intel_de_write(dev_priv, MIPI_EOT_DISABLE(port), CLOCKSTOP); 591} 592 593static void assert_dsi_pll(struct drm_i915_private *i915, bool state) 594{ 595 bool cur_state; 596 597 vlv_cck_get(i915); 598 cur_state = vlv_cck_read(i915, CCK_REG_DSI_PLL_CONTROL) & DSI_PLL_VCO_EN; 599 vlv_cck_put(i915); 600 601 I915_STATE_WARN(i915, cur_state != state, 602 "DSI PLL state assertion failure (expected %s, current %s)\n", 603 str_on_off(state), str_on_off(cur_state)); 604} 605 606void assert_dsi_pll_enabled(struct drm_i915_private *i915) 607{ 608 assert_dsi_pll(i915, true); 609} 610 611void assert_dsi_pll_disabled(struct drm_i915_private *i915) 612{ 613 assert_dsi_pll(i915, false); 614} 615