drivers/gpu/drm/i915/display/intel_combo_phy.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright © 2018 Intel Corporation
   4  */
   5
   6 #include "i915_reg.h"
   7 #include "intel_combo_phy.h"
   8 #include "intel_combo_phy_regs.h"
   9 #include "intel_de.h"
  10 #include "intel_display_types.h"
  11
  12 #define for_each_combo_phy(__dev_priv, __phy) \
  13         for ((__phy) = PHY_A; (__phy) < I915_MAX_PHYS; (__phy)++)       \
  14                 for_each_if(intel_phy_is_combo(__dev_priv, __phy))
  15
  16 #define for_each_combo_phy_reverse(__dev_priv, __phy) \
  17         for ((__phy) = I915_MAX_PHYS; (__phy)-- > PHY_A;) \
  18                 for_each_if(intel_phy_is_combo(__dev_priv, __phy))
  19
  20 enum {
  21         PROCMON_0_85V_DOT_0,
  22         PROCMON_0_95V_DOT_0,
  23         PROCMON_0_95V_DOT_1,
  24         PROCMON_1_05V_DOT_0,
  25         PROCMON_1_05V_DOT_1,
  26 };
  27
  28 static const struct icl_procmon {
  29         const char *name;
  30         u32 dw1, dw9, dw10;
  31 } icl_procmon_values[] = {
  32         [PROCMON_0_85V_DOT_0] = {
  33                 .name = "0.85V dot0 (low-voltage)",
  34                 .dw1 = 0x00000000, .dw9 = 0x62AB67BB, .dw10 = 0x51914F96,
  35         },
  36         [PROCMON_0_95V_DOT_0] = {
  37                 .name = "0.95V dot0",
  38                 .dw1 = 0x00000000, .dw9 = 0x86E172C7, .dw10 = 0x77CA5EAB,
  39         },
  40         [PROCMON_0_95V_DOT_1] = {
  41                 .name = "0.95V dot1",
  42                 .dw1 = 0x00000000, .dw9 = 0x93F87FE1, .dw10 = 0x8AE871C5,
  43         },
  44         [PROCMON_1_05V_DOT_0] = {
  45                 .name = "1.05V dot0",
  46                 .dw1 = 0x00000000, .dw9 = 0x98FA82DD, .dw10 = 0x89E46DC1,
  47         },
  48         [PROCMON_1_05V_DOT_1] = {
  49                 .name = "1.05V dot1",
  50                 .dw1 = 0x00440000, .dw9 = 0x9A00AB25, .dw10 = 0x8AE38FF1,
  51         },
  52 };
  53
  54 static const struct icl_procmon *
  55 icl_get_procmon_ref_values(struct drm_i915_private *dev_priv, enum phy phy)
  56 {
  57         u32 val;
  58
  59         val = intel_de_read(dev_priv, ICL_PORT_COMP_DW3(phy));
  60         switch (val & (PROCESS_INFO_MASK | VOLTAGE_INFO_MASK)) {
  61         default:
  62                 MISSING_CASE(val);
  63                 fallthrough;
  64         case VOLTAGE_INFO_0_85V | PROCESS_INFO_DOT_0:
  65                 return &icl_procmon_values[PROCMON_0_85V_DOT_0];
  66         case VOLTAGE_INFO_0_95V | PROCESS_INFO_DOT_0:
  67                 return &icl_procmon_values[PROCMON_0_95V_DOT_0];
  68         case VOLTAGE_INFO_0_95V | PROCESS_INFO_DOT_1:
  69                 return &icl_procmon_values[PROCMON_0_95V_DOT_1];
  70         case VOLTAGE_INFO_1_05V | PROCESS_INFO_DOT_0:
  71                 return &icl_procmon_values[PROCMON_1_05V_DOT_0];
  72         case VOLTAGE_INFO_1_05V | PROCESS_INFO_DOT_1:
  73                 return &icl_procmon_values[PROCMON_1_05V_DOT_1];
  74         }
  75 }
  76
  77 static void icl_set_procmon_ref_values(struct drm_i915_private *dev_priv,
  78                                        enum phy phy)
  79 {
  80         const struct icl_procmon *procmon;
  81
  82         procmon = icl_get_procmon_ref_values(dev_priv, phy);
  83
  84         intel_de_rmw(dev_priv, ICL_PORT_COMP_DW1(phy),
  85                      (0xff << 16) | 0xff, procmon->dw1);
  86
  87         intel_de_write(dev_priv, ICL_PORT_COMP_DW9(phy), procmon->dw9);
  88         intel_de_write(dev_priv, ICL_PORT_COMP_DW10(phy), procmon->dw10);
  89 }
  90
  91 static bool check_phy_reg(struct drm_i915_private *dev_priv,
  92                           enum phy phy, i915_reg_t reg, u32 mask,
  93                           u32 expected_val)
  94 {
  95         u32 val = intel_de_read(dev_priv, reg);
  96
  97         if ((val & mask) != expected_val) {
  98                 drm_dbg(&dev_priv->drm,
  99                         "Combo PHY %c reg %08x state mismatch: "
 100                         "current %08x mask %08x expected %08x\n",
 101                         phy_name(phy),
 102                         reg.reg, val, mask, expected_val);
 103                 return false;
 104         }
 105
 106         return true;
 107 }
 108
 109 static bool icl_verify_procmon_ref_values(struct drm_i915_private *dev_priv,
 110                                           enum phy phy)
 111 {
 112         const struct icl_procmon *procmon;
 113         bool ret;
 114
 115         procmon = icl_get_procmon_ref_values(dev_priv, phy);
 116
 117         drm_dbg_kms(&dev_priv->drm,
 118                     "Combo PHY %c Voltage/Process Info : %s\n",
 119                     phy_name(phy), procmon->name);
 120
 121         ret = check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW1(phy),
 122                             (0xff << 16) | 0xff, procmon->dw1);
 123         ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW9(phy),
 124                              -1U, procmon->dw9);
 125         ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW10(phy),
 126                              -1U, procmon->dw10);
 127
 128         return ret;
 129 }
 130
 131 static bool has_phy_misc(struct drm_i915_private *i915, enum phy phy)
 132 {
 133         /*
 134          * Some platforms only expect PHY_MISC to be programmed for PHY-A and
 135          * PHY-B and may not even have instances of the register for the
 136          * other combo PHY's.
 137          *
 138          * ADL-S technically has three instances of PHY_MISC, but only requires
 139          * that we program it for PHY A.
 140          */
 141
 142         if (IS_ALDERLAKE_S(i915))
 143                 return phy == PHY_A;
 144         else if (IS_JSL_EHL(i915) ||
 145                  IS_ROCKETLAKE(i915) ||
 146                  IS_DG1(i915))
 147                 return phy < PHY_C;
 148
 149         return true;
 150 }
 151
 152 static bool icl_combo_phy_enabled(struct drm_i915_private *dev_priv,
 153                                   enum phy phy)
 154 {
 155         /* The PHY C added by EHL has no PHY_MISC register */
 156         if (!has_phy_misc(dev_priv, phy))
 157                 return intel_de_read(dev_priv, ICL_PORT_COMP_DW0(phy)) & COMP_INIT;
 158         else
 159                 return !(intel_de_read(dev_priv, ICL_PHY_MISC(phy)) &
 160                          ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN) &&
 161                         (intel_de_read(dev_priv, ICL_PORT_COMP_DW0(phy)) & COMP_INIT);
 162 }
 163
 164 static bool ehl_vbt_ddi_d_present(struct drm_i915_private *i915)
 165 {
 166         bool ddi_a_present = intel_bios_is_port_present(i915, PORT_A);
 167         bool ddi_d_present = intel_bios_is_port_present(i915, PORT_D);
 168         bool dsi_present = intel_bios_is_dsi_present(i915, NULL);
 169
 170         /*
 171          * VBT's 'dvo port' field for child devices references the DDI, not
 172          * the PHY.  So if combo PHY A is wired up to drive an external
 173          * display, we should see a child device present on PORT_D and
 174          * nothing on PORT_A and no DSI.
 175          */
 176         if (ddi_d_present && !ddi_a_present && !dsi_present)
 177                 return true;
 178
 179         /*
 180          * If we encounter a VBT that claims to have an external display on
 181          * DDI-D _and_ an internal display on DDI-A/DSI leave an error message
 182          * in the log and let the internal display win.
 183          */
 184         if (ddi_d_present)
 185                 drm_err(&i915->drm,
 186                         "VBT claims to have both internal and external displays on PHY A.  Configuring for internal.\n");
 187
 188         return false;
 189 }
 190
 191 static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy)
 192 {
 193         /*
 194          * Certain PHYs are connected to compensation resistors and act
 195          * as masters to other PHYs.
 196          *
 197          * ICL,TGL:
 198          *   A(master) -> B(slave), C(slave)
 199          * RKL,DG1:
 200          *   A(master) -> B(slave)
 201          *   C(master) -> D(slave)
 202          * ADL-S:
 203          *   A(master) -> B(slave), C(slave)
 204          *   D(master) -> E(slave)
 205          *
 206          * We must set the IREFGEN bit for any PHY acting as a master
 207          * to another PHY.
 208          */
 209         if (phy == PHY_A)
 210                 return true;
 211         else if (IS_ALDERLAKE_S(dev_priv))
 212                 return phy == PHY_D;
 213         else if (IS_DG1(dev_priv) || IS_ROCKETLAKE(dev_priv))
 214                 return phy == PHY_C;
 215
 216         return false;
 217 }
 218
 219 static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
 220                                        enum phy phy)
 221 {
 222         bool ret = true;
 223         u32 expected_val = 0;
 224
 225         if (!icl_combo_phy_enabled(dev_priv, phy))
 226                 return false;
 227
 228         if (DISPLAY_VER(dev_priv) >= 12) {
 229                 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_TX_DW8_LN(0, phy),
 230                                      ICL_PORT_TX_DW8_ODCC_CLK_SEL |
 231                                      ICL_PORT_TX_DW8_ODCC_CLK_DIV_SEL_MASK,
 232                                      ICL_PORT_TX_DW8_ODCC_CLK_SEL |
 233                                      ICL_PORT_TX_DW8_ODCC_CLK_DIV_SEL_DIV2);
 234
 235                 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_PCS_DW1_LN(0, phy),
 236                                      DCC_MODE_SELECT_MASK, RUN_DCC_ONCE);
 237         }
 238
 239         ret &= icl_verify_procmon_ref_values(dev_priv, phy);
 240
 241         if (phy_is_master(dev_priv, phy)) {
 242                 ret &= check_phy_reg(dev_priv, phy, ICL_PORT_COMP_DW8(phy),
 243                                      IREFGEN, IREFGEN);
 244
 245                 if (IS_JSL_EHL(dev_priv)) {
 246                         if (ehl_vbt_ddi_d_present(dev_priv))
 247                                 expected_val = ICL_PHY_MISC_MUX_DDID;
 248
 249                         ret &= check_phy_reg(dev_priv, phy, ICL_PHY_MISC(phy),
 250                                              ICL_PHY_MISC_MUX_DDID,
 251                                              expected_val);
 252                 }
 253         }
 254
 255         ret &= check_phy_reg(dev_priv, phy, ICL_PORT_CL_DW5(phy),
 256                              CL_POWER_DOWN_ENABLE, CL_POWER_DOWN_ENABLE);
 257
 258         return ret;
 259 }
 260
 261 void intel_combo_phy_power_up_lanes(struct drm_i915_private *dev_priv,
 262                                     enum phy phy, bool is_dsi,
 263                                     int lane_count, bool lane_reversal)
 264 {
 265         u8 lane_mask;
 266
 267         if (is_dsi) {
 268                 drm_WARN_ON(&dev_priv->drm, lane_reversal);
 269
 270                 switch (lane_count) {
 271                 case 1:
 272                         lane_mask = PWR_DOWN_LN_3_1_0;
 273                         break;
 274                 case 2:
 275                         lane_mask = PWR_DOWN_LN_3_1;
 276                         break;
 277                 case 3:
 278                         lane_mask = PWR_DOWN_LN_3;
 279                         break;
 280                 default:
 281                         MISSING_CASE(lane_count);
 282                         fallthrough;
 283                 case 4:
 284                         lane_mask = PWR_UP_ALL_LANES;
 285                         break;
 286                 }
 287         } else {
 288                 switch (lane_count) {
 289                 case 1:
 290                         lane_mask = lane_reversal ? PWR_DOWN_LN_2_1_0 :
 291                                                     PWR_DOWN_LN_3_2_1;
 292                         break;
 293                 case 2:
 294                         lane_mask = lane_reversal ? PWR_DOWN_LN_1_0 :
 295                                                     PWR_DOWN_LN_3_2;
 296                         break;
 297                 default:
 298                         MISSING_CASE(lane_count);
 299                         fallthrough;
 300                 case 4:
 301                         lane_mask = PWR_UP_ALL_LANES;
 302                         break;
 303                 }
 304         }
 305
 306         intel_de_rmw(dev_priv, ICL_PORT_CL_DW10(phy),
 307                      PWR_DOWN_LN_MASK, lane_mask);
 308 }
 309
 310 static void icl_combo_phys_init(struct drm_i915_private *dev_priv)
 311 {
 312         enum phy phy;
 313
 314         for_each_combo_phy(dev_priv, phy) {
 315                 u32 val;
 316
 317                 if (icl_combo_phy_verify_state(dev_priv, phy)) {
 318                         drm_dbg(&dev_priv->drm,
 319                                 "Combo PHY %c already enabled, won't reprogram it.\n",
 320                                 phy_name(phy));
 321                         continue;
 322                 }
 323
 324                 if (!has_phy_misc(dev_priv, phy))
 325                         goto skip_phy_misc;
 326
 327                 /*
 328                  * EHL's combo PHY A can be hooked up to either an external
 329                  * display (via DDI-D) or an internal display (via DDI-A or
 330                  * the DSI DPHY).  This is a motherboard design decision that
 331                  * can't be changed on the fly, so initialize the PHY's mux
 332                  * based on whether our VBT indicates the presence of any
 333                  * "internal" child devices.
 334                  */
 335                 val = intel_de_read(dev_priv, ICL_PHY_MISC(phy));
 336                 if (IS_JSL_EHL(dev_priv) && phy == PHY_A) {
 337                         val &= ~ICL_PHY_MISC_MUX_DDID;
 338
 339                         if (ehl_vbt_ddi_d_present(dev_priv))
 340                                 val |= ICL_PHY_MISC_MUX_DDID;
 341                 }
 342
 343                 val &= ~ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN;
 344                 intel_de_write(dev_priv, ICL_PHY_MISC(phy), val);
 345
 346 skip_phy_misc:
 347                 if (DISPLAY_VER(dev_priv) >= 12) {
 348                         val = intel_de_read(dev_priv, ICL_PORT_TX_DW8_LN(0, phy));
 349                         val &= ~ICL_PORT_TX_DW8_ODCC_CLK_DIV_SEL_MASK;
 350                         val |= ICL_PORT_TX_DW8_ODCC_CLK_SEL;
 351                         val |= ICL_PORT_TX_DW8_ODCC_CLK_DIV_SEL_DIV2;
 352                         intel_de_write(dev_priv, ICL_PORT_TX_DW8_GRP(phy), val);
 353
 354                         val = intel_de_read(dev_priv, ICL_PORT_PCS_DW1_LN(0, phy));
 355                         val &= ~DCC_MODE_SELECT_MASK;
 356                         val |= RUN_DCC_ONCE;
 357                         intel_de_write(dev_priv, ICL_PORT_PCS_DW1_GRP(phy), val);
 358                 }
 359
 360                 icl_set_procmon_ref_values(dev_priv, phy);
 361
 362                 if (phy_is_master(dev_priv, phy))
 363                         intel_de_rmw(dev_priv, ICL_PORT_COMP_DW8(phy),
 364                                      0, IREFGEN);
 365
 366                 intel_de_rmw(dev_priv, ICL_PORT_COMP_DW0(phy), 0, COMP_INIT);
 367                 intel_de_rmw(dev_priv, ICL_PORT_CL_DW5(phy),
 368                              0, CL_POWER_DOWN_ENABLE);
 369         }
 370 }
 371
 372 static void icl_combo_phys_uninit(struct drm_i915_private *dev_priv)
 373 {
 374         enum phy phy;
 375
 376         for_each_combo_phy_reverse(dev_priv, phy) {
 377                 if (phy == PHY_A &&
 378                     !icl_combo_phy_verify_state(dev_priv, phy)) {
 379                         if (IS_TIGERLAKE(dev_priv) || IS_DG1(dev_priv)) {
 380                                 /*
 381                                  * A known problem with old ifwi:
 382                                  * https://gitlab.freedesktop.org/drm/intel/-/issues/2411
 383                                  * Suppress the warning for CI. Remove ASAP!
 384                                  */
 385                                 drm_dbg_kms(&dev_priv->drm,
 386                                             "Combo PHY %c HW state changed unexpectedly\n",
 387                                             phy_name(phy));
 388                         } else {
 389                                 drm_warn(&dev_priv->drm,
 390                                          "Combo PHY %c HW state changed unexpectedly\n",
 391                                          phy_name(phy));
 392                         }
 393                 }
 394
 395                 if (!has_phy_misc(dev_priv, phy))
 396                         goto skip_phy_misc;
 397
 398                 intel_de_rmw(dev_priv, ICL_PHY_MISC(phy), 0,
 399                              ICL_PHY_MISC_DE_IO_COMP_PWR_DOWN);
 400
 401 skip_phy_misc:
 402                 intel_de_rmw(dev_priv, ICL_PORT_COMP_DW0(phy), COMP_INIT, 0);
 403         }
 404 }
 405
 406 void intel_combo_phy_init(struct drm_i915_private *i915)
 407 {
 408         icl_combo_phys_init(i915);
 409 }
 410
 411 void intel_combo_phy_uninit(struct drm_i915_private *i915)
 412 {
 413         icl_combo_phys_uninit(i915);
 414 }