drivers/gpu/drm/i915/intel_dsi_pll.c

   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 "intel_drv.h"
  30 #include "i915_drv.h"
  31 #include "intel_dsi.h"
  32
  33 static const u16 lfsr_converts[] = {
  34         426, 469, 234, 373, 442, 221, 110, 311, 411,            /* 62 - 70 */
  35         461, 486, 243, 377, 188, 350, 175, 343, 427, 213,       /* 71 - 80 */
  36         106, 53, 282, 397, 454, 227, 113, 56, 284, 142,         /* 81 - 90 */
  37         71, 35, 273, 136, 324, 418, 465, 488, 500, 506          /* 91 - 100 */
  38 };
  39
  40 /* Get DSI clock from pixel clock */
  41 static u32 dsi_clk_from_pclk(u32 pclk, enum mipi_dsi_pixel_format fmt,
  42                              int lane_count)
  43 {
  44         u32 dsi_clk_khz;
  45         u32 bpp = mipi_dsi_pixel_format_to_bpp(fmt);
  46
  47         /* DSI data rate = pixel clock * bits per pixel / lane count
  48            pixel clock is converted from KHz to Hz */
  49         dsi_clk_khz = DIV_ROUND_CLOSEST(pclk * bpp, lane_count);
  50
  51         return dsi_clk_khz;
  52 }
  53
  54 static int dsi_calc_mnp(struct drm_i915_private *dev_priv,
  55                         struct intel_crtc_state *config,
  56                         int target_dsi_clk)
  57 {
  58         unsigned int m_min, m_max, p_min = 2, p_max = 6;
  59         unsigned int m, n, p;
  60         unsigned int calc_m, calc_p;
  61         int delta, ref_clk;
  62
  63         /* target_dsi_clk is expected in kHz */
  64         if (target_dsi_clk < 300000 || target_dsi_clk > 1150000) {
  65                 DRM_ERROR("DSI CLK Out of Range\n");
  66                 return -ECHRNG;
  67         }
  68
  69         if (IS_CHERRYVIEW(dev_priv)) {
  70                 ref_clk = 100000;
  71                 n = 4;
  72                 m_min = 70;
  73                 m_max = 96;
  74         } else {
  75                 ref_clk = 25000;
  76                 n = 1;
  77                 m_min = 62;
  78                 m_max = 92;
  79         }
  80
  81         calc_p = p_min;
  82         calc_m = m_min;
  83         delta = abs(target_dsi_clk - (m_min * ref_clk) / (p_min * n));
  84
  85         for (m = m_min; m <= m_max && delta; m++) {
  86                 for (p = p_min; p <= p_max && delta; p++) {
  87                         /*
  88                          * Find the optimal m and p divisors with minimal delta
  89                          * +/- the required clock
  90                          */
  91                         int calc_dsi_clk = (m * ref_clk) / (p * n);
  92                         int d = abs(target_dsi_clk - calc_dsi_clk);
  93                         if (d < delta) {
  94                                 delta = d;
  95                                 calc_m = m;
  96                                 calc_p = p;
  97                         }
  98                 }
  99         }
 100
 101         /* register has log2(N1), this works fine for powers of two */
 102         config->dsi_pll.ctrl = 1 << (DSI_PLL_P1_POST_DIV_SHIFT + calc_p - 2);
 103         config->dsi_pll.div =
 104                 (ffs(n) - 1) << DSI_PLL_N1_DIV_SHIFT |
 105                 (u32)lfsr_converts[calc_m - 62] << DSI_PLL_M1_DIV_SHIFT;
 106
 107         return 0;
 108 }
 109
 110 /*
 111  * XXX: The muxing and gating is hard coded for now. Need to add support for
 112  * sharing PLLs with two DSI outputs.
 113  */
 114 static int vlv_compute_dsi_pll(struct intel_encoder *encoder,
 115                                struct intel_crtc_state *config)
 116 {
 117         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 118         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 119         int ret;
 120         u32 dsi_clk;
 121
 122         dsi_clk = dsi_clk_from_pclk(intel_dsi->pclk, intel_dsi->pixel_format,
 123                                     intel_dsi->lane_count);
 124
 125         ret = dsi_calc_mnp(dev_priv, config, dsi_clk);
 126         if (ret) {
 127                 DRM_DEBUG_KMS("dsi_calc_mnp failed\n");
 128                 return ret;
 129         }
 130
 131         if (intel_dsi->ports & (1 << PORT_A))
 132                 config->dsi_pll.ctrl |= DSI_PLL_CLK_GATE_DSI0_DSIPLL;
 133
 134         if (intel_dsi->ports & (1 << PORT_C))
 135                 config->dsi_pll.ctrl |= DSI_PLL_CLK_GATE_DSI1_DSIPLL;
 136
 137         config->dsi_pll.ctrl |= DSI_PLL_VCO_EN;
 138
 139         DRM_DEBUG_KMS("dsi pll div %08x, ctrl %08x\n",
 140                       config->dsi_pll.div, config->dsi_pll.ctrl);
 141
 142         return 0;
 143 }
 144
 145 static void vlv_enable_dsi_pll(struct intel_encoder *encoder,
 146                                const struct intel_crtc_state *config)
 147 {
 148         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 149
 150         DRM_DEBUG_KMS("\n");
 151
 152         mutex_lock(&dev_priv->sb_lock);
 153
 154         vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, 0);
 155         vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_DIVIDER, config->dsi_pll.div);
 156         vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL,
 157                       config->dsi_pll.ctrl & ~DSI_PLL_VCO_EN);
 158
 159         /* wait at least 0.5 us after ungating before enabling VCO,
 160          * allow hrtimer subsystem optimization by relaxing timing
 161          */
 162         usleep_range(10, 50);
 163
 164         vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, config->dsi_pll.ctrl);
 165
 166         if (wait_for(vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL) &
 167                                                 DSI_PLL_LOCK, 20)) {
 168
 169                 mutex_unlock(&dev_priv->sb_lock);
 170                 DRM_ERROR("DSI PLL lock failed\n");
 171                 return;
 172         }
 173         mutex_unlock(&dev_priv->sb_lock);
 174
 175         DRM_DEBUG_KMS("DSI PLL locked\n");
 176 }
 177
 178 static void vlv_disable_dsi_pll(struct intel_encoder *encoder)
 179 {
 180         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 181         u32 tmp;
 182
 183         DRM_DEBUG_KMS("\n");
 184
 185         mutex_lock(&dev_priv->sb_lock);
 186
 187         tmp = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
 188         tmp &= ~DSI_PLL_VCO_EN;
 189         tmp |= DSI_PLL_LDO_GATE;
 190         vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, tmp);
 191
 192         mutex_unlock(&dev_priv->sb_lock);
 193 }
 194
 195 static bool bxt_dsi_pll_is_enabled(struct drm_i915_private *dev_priv)
 196 {
 197         bool enabled;
 198         u32 val;
 199         u32 mask;
 200
 201         mask = BXT_DSI_PLL_DO_ENABLE | BXT_DSI_PLL_LOCKED;
 202         val = I915_READ(BXT_DSI_PLL_ENABLE);
 203         enabled = (val & mask) == mask;
 204
 205         if (!enabled)
 206                 return false;
 207
 208         /*
 209          * Dividers must be programmed with valid values. As per BSEPC, for
 210          * GEMINLAKE only PORT A divider values are checked while for BXT
 211          * both divider values are validated. Check this here for
 212          * paranoia, since BIOS is known to misconfigure PLLs in this way at
 213          * times, and since accessing DSI registers with invalid dividers
 214          * causes a system hang.
 215          */
 216         val = I915_READ(BXT_DSI_PLL_CTL);
 217         if (IS_GEMINILAKE(dev_priv)) {
 218                 if (!(val & BXT_DSIA_16X_MASK)) {
 219                         DRM_DEBUG_DRIVER("Invalid PLL divider (%08x)\n", val);
 220                         enabled = false;
 221                 }
 222         } else {
 223                 if (!(val & BXT_DSIA_16X_MASK) || !(val & BXT_DSIC_16X_MASK)) {
 224                         DRM_DEBUG_DRIVER("Invalid PLL divider (%08x)\n", val);
 225                         enabled = false;
 226                 }
 227         }
 228
 229         return enabled;
 230 }
 231
 232 static void bxt_disable_dsi_pll(struct intel_encoder *encoder)
 233 {
 234         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 235         u32 val;
 236
 237         DRM_DEBUG_KMS("\n");
 238
 239         val = I915_READ(BXT_DSI_PLL_ENABLE);
 240         val &= ~BXT_DSI_PLL_DO_ENABLE;
 241         I915_WRITE(BXT_DSI_PLL_ENABLE, val);
 242
 243         /*
 244          * PLL lock should deassert within 200us.
 245          * Wait up to 1ms before timing out.
 246          */
 247         if (intel_wait_for_register(dev_priv,
 248                                     BXT_DSI_PLL_ENABLE,
 249                                     BXT_DSI_PLL_LOCKED,
 250                                     0,
 251                                     1))
 252                 DRM_ERROR("Timeout waiting for PLL lock deassertion\n");
 253 }
 254
 255 static void assert_bpp_mismatch(enum mipi_dsi_pixel_format fmt, int pipe_bpp)
 256 {
 257         int bpp = mipi_dsi_pixel_format_to_bpp(fmt);
 258
 259         WARN(bpp != pipe_bpp,
 260              "bpp match assertion failure (expected %d, current %d)\n",
 261              bpp, pipe_bpp);
 262 }
 263
 264 static u32 vlv_dsi_get_pclk(struct intel_encoder *encoder, int pipe_bpp,
 265                             struct intel_crtc_state *config)
 266 {
 267         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 268         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 269         u32 dsi_clock, pclk;
 270         u32 pll_ctl, pll_div;
 271         u32 m = 0, p = 0, n;
 272         int refclk = IS_CHERRYVIEW(dev_priv) ? 100000 : 25000;
 273         int i;
 274
 275         DRM_DEBUG_KMS("\n");
 276
 277         mutex_lock(&dev_priv->sb_lock);
 278         pll_ctl = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
 279         pll_div = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_DIVIDER);
 280         mutex_unlock(&dev_priv->sb_lock);
 281
 282         config->dsi_pll.ctrl = pll_ctl & ~DSI_PLL_LOCK;
 283         config->dsi_pll.div = pll_div;
 284
 285         /* mask out other bits and extract the P1 divisor */
 286         pll_ctl &= DSI_PLL_P1_POST_DIV_MASK;
 287         pll_ctl = pll_ctl >> (DSI_PLL_P1_POST_DIV_SHIFT - 2);
 288
 289         /* N1 divisor */
 290         n = (pll_div & DSI_PLL_N1_DIV_MASK) >> DSI_PLL_N1_DIV_SHIFT;
 291         n = 1 << n; /* register has log2(N1) */
 292
 293         /* mask out the other bits and extract the M1 divisor */
 294         pll_div &= DSI_PLL_M1_DIV_MASK;
 295         pll_div = pll_div >> DSI_PLL_M1_DIV_SHIFT;
 296
 297         while (pll_ctl) {
 298                 pll_ctl = pll_ctl >> 1;
 299                 p++;
 300         }
 301         p--;
 302
 303         if (!p) {
 304                 DRM_ERROR("wrong P1 divisor\n");
 305                 return 0;
 306         }
 307
 308         for (i = 0; i < ARRAY_SIZE(lfsr_converts); i++) {
 309                 if (lfsr_converts[i] == pll_div)
 310                         break;
 311         }
 312
 313         if (i == ARRAY_SIZE(lfsr_converts)) {
 314                 DRM_ERROR("wrong m_seed programmed\n");
 315                 return 0;
 316         }
 317
 318         m = i + 62;
 319
 320         dsi_clock = (m * refclk) / (p * n);
 321
 322         /* pixel_format and pipe_bpp should agree */
 323         assert_bpp_mismatch(intel_dsi->pixel_format, pipe_bpp);
 324
 325         pclk = DIV_ROUND_CLOSEST(dsi_clock * intel_dsi->lane_count, pipe_bpp);
 326
 327         return pclk;
 328 }
 329
 330 static u32 bxt_dsi_get_pclk(struct intel_encoder *encoder, int pipe_bpp,
 331                             struct intel_crtc_state *config)
 332 {
 333         u32 pclk;
 334         u32 dsi_clk;
 335         u32 dsi_ratio;
 336         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 337         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 338
 339         /* Divide by zero */
 340         if (!pipe_bpp) {
 341                 DRM_ERROR("Invalid BPP(0)\n");
 342                 return 0;
 343         }
 344
 345         config->dsi_pll.ctrl = I915_READ(BXT_DSI_PLL_CTL);
 346
 347         dsi_ratio = config->dsi_pll.ctrl & BXT_DSI_PLL_RATIO_MASK;
 348
 349         dsi_clk = (dsi_ratio * BXT_REF_CLOCK_KHZ) / 2;
 350
 351         /* pixel_format and pipe_bpp should agree */
 352         assert_bpp_mismatch(intel_dsi->pixel_format, pipe_bpp);
 353
 354         pclk = DIV_ROUND_CLOSEST(dsi_clk * intel_dsi->lane_count, pipe_bpp);
 355
 356         DRM_DEBUG_DRIVER("Calculated pclk=%u\n", pclk);
 357         return pclk;
 358 }
 359
 360 u32 intel_dsi_get_pclk(struct intel_encoder *encoder, int pipe_bpp,
 361                        struct intel_crtc_state *config)
 362 {
 363         if (IS_GEN9_LP(to_i915(encoder->base.dev)))
 364                 return bxt_dsi_get_pclk(encoder, pipe_bpp, config);
 365         else
 366                 return vlv_dsi_get_pclk(encoder, pipe_bpp, config);
 367 }
 368
 369 static void vlv_dsi_reset_clocks(struct intel_encoder *encoder, enum port port)
 370 {
 371         u32 temp;
 372         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 373         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 374
 375         temp = I915_READ(MIPI_CTRL(port));
 376         temp &= ~ESCAPE_CLOCK_DIVIDER_MASK;
 377         I915_WRITE(MIPI_CTRL(port), temp |
 378                         intel_dsi->escape_clk_div <<
 379                         ESCAPE_CLOCK_DIVIDER_SHIFT);
 380 }
 381
 382 static void glk_dsi_program_esc_clock(struct drm_device *dev,
 383                                    const struct intel_crtc_state *config)
 384 {
 385         struct drm_i915_private *dev_priv = to_i915(dev);
 386         u32 dsi_rate = 0;
 387         u32 pll_ratio = 0;
 388         u32 ddr_clk = 0;
 389         u32 div1_value = 0;
 390         u32 div2_value = 0;
 391         u32 txesc1_div = 0;
 392         u32 txesc2_div = 0;
 393
 394         pll_ratio = config->dsi_pll.ctrl & BXT_DSI_PLL_RATIO_MASK;
 395
 396         dsi_rate = (BXT_REF_CLOCK_KHZ * pll_ratio) / 2;
 397
 398         ddr_clk = dsi_rate / 2;
 399
 400         /* Variable divider value */
 401         div1_value = DIV_ROUND_CLOSEST(ddr_clk, 20000);
 402
 403         /* Calculate TXESC1 divider */
 404         if (div1_value <= 10)
 405                 txesc1_div = div1_value;
 406         else if ((div1_value > 10) && (div1_value <= 20))
 407                 txesc1_div = DIV_ROUND_UP(div1_value, 2);
 408         else if ((div1_value > 20) && (div1_value <= 30))
 409                 txesc1_div = DIV_ROUND_UP(div1_value, 4);
 410         else if ((div1_value > 30) && (div1_value <= 40))
 411                 txesc1_div = DIV_ROUND_UP(div1_value, 6);
 412         else if ((div1_value > 40) && (div1_value <= 50))
 413                 txesc1_div = DIV_ROUND_UP(div1_value, 8);
 414         else
 415                 txesc1_div = 10;
 416
 417         /* Calculate TXESC2 divider */
 418         div2_value = DIV_ROUND_UP(div1_value, txesc1_div);
 419
 420         if (div2_value < 10)
 421                 txesc2_div = div2_value;
 422         else
 423                 txesc2_div = 10;
 424
 425         I915_WRITE(MIPIO_TXESC_CLK_DIV1, txesc1_div & GLK_TX_ESC_CLK_DIV1_MASK);
 426         I915_WRITE(MIPIO_TXESC_CLK_DIV2, txesc2_div & GLK_TX_ESC_CLK_DIV2_MASK);
 427 }
 428
 429 /* Program BXT Mipi clocks and dividers */
 430 static void bxt_dsi_program_clocks(struct drm_device *dev, enum port port,
 431                                    const struct intel_crtc_state *config)
 432 {
 433         struct drm_i915_private *dev_priv = to_i915(dev);
 434         u32 tmp;
 435         u32 dsi_rate = 0;
 436         u32 pll_ratio = 0;
 437         u32 rx_div;
 438         u32 tx_div;
 439         u32 rx_div_upper;
 440         u32 rx_div_lower;
 441         u32 mipi_8by3_divider;
 442
 443         /* Clear old configurations */
 444         tmp = I915_READ(BXT_MIPI_CLOCK_CTL);
 445         tmp &= ~(BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port));
 446         tmp &= ~(BXT_MIPI_RX_ESCLK_UPPER_FIXDIV_MASK(port));
 447         tmp &= ~(BXT_MIPI_8X_BY3_DIVIDER_MASK(port));
 448         tmp &= ~(BXT_MIPI_RX_ESCLK_LOWER_FIXDIV_MASK(port));
 449
 450         /* Get the current DSI rate(actual) */
 451         pll_ratio = config->dsi_pll.ctrl & BXT_DSI_PLL_RATIO_MASK;
 452         dsi_rate = (BXT_REF_CLOCK_KHZ * pll_ratio) / 2;
 453
 454         /*
 455          * tx clock should be <= 20MHz and the div value must be
 456          * subtracted by 1 as per bspec
 457          */
 458         tx_div = DIV_ROUND_UP(dsi_rate, 20000) - 1;
 459         /*
 460          * rx clock should be <= 150MHz and the div value must be
 461          * subtracted by 1 as per bspec
 462          */
 463         rx_div = DIV_ROUND_UP(dsi_rate, 150000) - 1;
 464
 465         /*
 466          * rx divider value needs to be updated in the
 467          * two differnt bit fields in the register hence splitting the
 468          * rx divider value accordingly
 469          */
 470         rx_div_lower = rx_div & RX_DIVIDER_BIT_1_2;
 471         rx_div_upper = (rx_div & RX_DIVIDER_BIT_3_4) >> 2;
 472
 473         mipi_8by3_divider = 0x2;
 474
 475         tmp |= BXT_MIPI_8X_BY3_DIVIDER(port, mipi_8by3_divider);
 476         tmp |= BXT_MIPI_TX_ESCLK_DIVIDER(port, tx_div);
 477         tmp |= BXT_MIPI_RX_ESCLK_LOWER_DIVIDER(port, rx_div_lower);
 478         tmp |= BXT_MIPI_RX_ESCLK_UPPER_DIVIDER(port, rx_div_upper);
 479
 480         I915_WRITE(BXT_MIPI_CLOCK_CTL, tmp);
 481 }
 482
 483 static int gen9lp_compute_dsi_pll(struct intel_encoder *encoder,
 484                                struct intel_crtc_state *config)
 485 {
 486         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 487         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 488         u8 dsi_ratio, dsi_ratio_min, dsi_ratio_max;
 489         u32 dsi_clk;
 490
 491         dsi_clk = dsi_clk_from_pclk(intel_dsi->pclk, intel_dsi->pixel_format,
 492                                     intel_dsi->lane_count);
 493
 494         /*
 495          * From clock diagram, to get PLL ratio divider, divide double of DSI
 496          * link rate (i.e., 2*8x=16x frequency value) by ref clock. Make sure to
 497          * round 'up' the result
 498          */
 499         dsi_ratio = DIV_ROUND_UP(dsi_clk * 2, BXT_REF_CLOCK_KHZ);
 500
 501         if (IS_BROXTON(dev_priv)) {
 502                 dsi_ratio_min = BXT_DSI_PLL_RATIO_MIN;
 503                 dsi_ratio_max = BXT_DSI_PLL_RATIO_MAX;
 504         } else {
 505                 dsi_ratio_min = GLK_DSI_PLL_RATIO_MIN;
 506                 dsi_ratio_max = GLK_DSI_PLL_RATIO_MAX;
 507         }
 508
 509         if (dsi_ratio < dsi_ratio_min || dsi_ratio > dsi_ratio_max) {
 510                 DRM_ERROR("Cant get a suitable ratio from DSI PLL ratios\n");
 511                 return -ECHRNG;
 512         } else
 513                 DRM_DEBUG_KMS("DSI PLL calculation is Done!!\n");
 514
 515         /*
 516          * Program DSI ratio and Select MIPIC and MIPIA PLL output as 8x
 517          * Spec says both have to be programmed, even if one is not getting
 518          * used. Configure MIPI_CLOCK_CTL dividers in modeset
 519          */
 520         config->dsi_pll.ctrl = dsi_ratio | BXT_DSIA_16X_BY2 | BXT_DSIC_16X_BY2;
 521
 522         /* As per recommendation from hardware team,
 523          * Prog PVD ratio =1 if dsi ratio <= 50
 524          */
 525         if (IS_BROXTON(dev_priv) && dsi_ratio <= 50)
 526                 config->dsi_pll.ctrl |= BXT_DSI_PLL_PVD_RATIO_1;
 527
 528         return 0;
 529 }
 530
 531 static void gen9lp_enable_dsi_pll(struct intel_encoder *encoder,
 532                                const struct intel_crtc_state *config)
 533 {
 534         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 535         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 536         enum port port;
 537         u32 val;
 538
 539         DRM_DEBUG_KMS("\n");
 540
 541         /* Configure PLL vales */
 542         I915_WRITE(BXT_DSI_PLL_CTL, config->dsi_pll.ctrl);
 543         POSTING_READ(BXT_DSI_PLL_CTL);
 544
 545         /* Program TX, RX, Dphy clocks */
 546         if (IS_BROXTON(dev_priv)) {
 547                 for_each_dsi_port(port, intel_dsi->ports)
 548                         bxt_dsi_program_clocks(encoder->base.dev, port, config);
 549         } else {
 550                 glk_dsi_program_esc_clock(encoder->base.dev, config);
 551         }
 552
 553         /* Enable DSI PLL */
 554         val = I915_READ(BXT_DSI_PLL_ENABLE);
 555         val |= BXT_DSI_PLL_DO_ENABLE;
 556         I915_WRITE(BXT_DSI_PLL_ENABLE, val);
 557
 558         /* Timeout and fail if PLL not locked */
 559         if (intel_wait_for_register(dev_priv,
 560                                     BXT_DSI_PLL_ENABLE,
 561                                     BXT_DSI_PLL_LOCKED,
 562                                     BXT_DSI_PLL_LOCKED,
 563                                     1)) {
 564                 DRM_ERROR("Timed out waiting for DSI PLL to lock\n");
 565                 return;
 566         }
 567
 568         DRM_DEBUG_KMS("DSI PLL locked\n");
 569 }
 570
 571 bool intel_dsi_pll_is_enabled(struct drm_i915_private *dev_priv)
 572 {
 573         if (IS_GEN9_LP(dev_priv))
 574                 return bxt_dsi_pll_is_enabled(dev_priv);
 575
 576         MISSING_CASE(INTEL_DEVID(dev_priv));
 577
 578         return false;
 579 }
 580
 581 int intel_compute_dsi_pll(struct intel_encoder *encoder,
 582                           struct intel_crtc_state *config)
 583 {
 584         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 585
 586         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 587                 return vlv_compute_dsi_pll(encoder, config);
 588         else if (IS_GEN9_LP(dev_priv))
 589                 return gen9lp_compute_dsi_pll(encoder, config);
 590
 591         return -ENODEV;
 592 }
 593
 594 void intel_enable_dsi_pll(struct intel_encoder *encoder,
 595                           const struct intel_crtc_state *config)
 596 {
 597         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 598
 599         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 600                 vlv_enable_dsi_pll(encoder, config);
 601         else if (IS_GEN9_LP(dev_priv))
 602                 gen9lp_enable_dsi_pll(encoder, config);
 603 }
 604
 605 void intel_disable_dsi_pll(struct intel_encoder *encoder)
 606 {
 607         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 608
 609         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 610                 vlv_disable_dsi_pll(encoder);
 611         else if (IS_GEN9_LP(dev_priv))
 612                 bxt_disable_dsi_pll(encoder);
 613 }
 614
 615 static void gen9lp_dsi_reset_clocks(struct intel_encoder *encoder,
 616                                     enum port port)
 617 {
 618         u32 tmp;
 619         struct drm_device *dev = encoder->base.dev;
 620         struct drm_i915_private *dev_priv = to_i915(dev);
 621
 622         /* Clear old configurations */
 623         if (IS_BROXTON(dev_priv)) {
 624                 tmp = I915_READ(BXT_MIPI_CLOCK_CTL);
 625                 tmp &= ~(BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port));
 626                 tmp &= ~(BXT_MIPI_RX_ESCLK_UPPER_FIXDIV_MASK(port));
 627                 tmp &= ~(BXT_MIPI_8X_BY3_DIVIDER_MASK(port));
 628                 tmp &= ~(BXT_MIPI_RX_ESCLK_LOWER_FIXDIV_MASK(port));
 629                 I915_WRITE(BXT_MIPI_CLOCK_CTL, tmp);
 630         } else {
 631                 tmp = I915_READ(MIPIO_TXESC_CLK_DIV1);
 632                 tmp &= ~GLK_TX_ESC_CLK_DIV1_MASK;
 633                 I915_WRITE(MIPIO_TXESC_CLK_DIV1, tmp);
 634
 635                 tmp = I915_READ(MIPIO_TXESC_CLK_DIV2);
 636                 tmp &= ~GLK_TX_ESC_CLK_DIV2_MASK;
 637                 I915_WRITE(MIPIO_TXESC_CLK_DIV2, tmp);
 638         }
 639         I915_WRITE(MIPI_EOT_DISABLE(port), CLOCKSTOP);
 640 }
 641
 642 void intel_dsi_reset_clocks(struct intel_encoder *encoder, enum port port)
 643 {
 644         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 645
 646         if (IS_GEN9_LP(dev_priv))
 647                 gen9lp_dsi_reset_clocks(encoder, port);
 648         else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 649                 vlv_dsi_reset_clocks(encoder, port);
 650 }