drivers/gpu/drm/i915/intel_pch.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright 2019 Intel Corporation.
   4  */
   5
   6 #include "i915_drv.h"
   7 #include "i915_utils.h"
   8 #include "intel_pch.h"
   9
  10 /* Map PCH device id to PCH type, or PCH_NONE if unknown. */
  11 static enum intel_pch
  12 intel_pch_type(const struct drm_i915_private *dev_priv, unsigned short id)
  13 {
  14         switch (id) {
  15         case INTEL_PCH_IBX_DEVICE_ID_TYPE:
  16                 drm_dbg_kms(&dev_priv->drm, "Found Ibex Peak PCH\n");
  17                 drm_WARN_ON(&dev_priv->drm, GRAPHICS_VER(dev_priv) != 5);
  18                 return PCH_IBX;
  19         case INTEL_PCH_CPT_DEVICE_ID_TYPE:
  20                 drm_dbg_kms(&dev_priv->drm, "Found CougarPoint PCH\n");
  21                 drm_WARN_ON(&dev_priv->drm,
  22                             GRAPHICS_VER(dev_priv) != 6 && !IS_IVYBRIDGE(dev_priv));
  23                 return PCH_CPT;
  24         case INTEL_PCH_PPT_DEVICE_ID_TYPE:
  25                 drm_dbg_kms(&dev_priv->drm, "Found PantherPoint PCH\n");
  26                 drm_WARN_ON(&dev_priv->drm,
  27                             GRAPHICS_VER(dev_priv) != 6 && !IS_IVYBRIDGE(dev_priv));
  28                 /* PantherPoint is CPT compatible */
  29                 return PCH_CPT;
  30         case INTEL_PCH_LPT_DEVICE_ID_TYPE:
  31                 drm_dbg_kms(&dev_priv->drm, "Found LynxPoint PCH\n");
  32                 drm_WARN_ON(&dev_priv->drm,
  33                             !IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
  34                 drm_WARN_ON(&dev_priv->drm,
  35                             IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv));
  36                 return PCH_LPT;
  37         case INTEL_PCH_LPT_LP_DEVICE_ID_TYPE:
  38                 drm_dbg_kms(&dev_priv->drm, "Found LynxPoint LP PCH\n");
  39                 drm_WARN_ON(&dev_priv->drm,
  40                             !IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
  41                 drm_WARN_ON(&dev_priv->drm,
  42                             !IS_HSW_ULT(dev_priv) && !IS_BDW_ULT(dev_priv));
  43                 return PCH_LPT;
  44         case INTEL_PCH_WPT_DEVICE_ID_TYPE:
  45                 drm_dbg_kms(&dev_priv->drm, "Found WildcatPoint PCH\n");
  46                 drm_WARN_ON(&dev_priv->drm,
  47                             !IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
  48                 drm_WARN_ON(&dev_priv->drm,
  49                             IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv));
  50                 /* WildcatPoint is LPT compatible */
  51                 return PCH_LPT;
  52         case INTEL_PCH_WPT_LP_DEVICE_ID_TYPE:
  53                 drm_dbg_kms(&dev_priv->drm, "Found WildcatPoint LP PCH\n");
  54                 drm_WARN_ON(&dev_priv->drm,
  55                             !IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
  56                 drm_WARN_ON(&dev_priv->drm,
  57                             !IS_HSW_ULT(dev_priv) && !IS_BDW_ULT(dev_priv));
  58                 /* WildcatPoint is LPT compatible */
  59                 return PCH_LPT;
  60         case INTEL_PCH_SPT_DEVICE_ID_TYPE:
  61                 drm_dbg_kms(&dev_priv->drm, "Found SunrisePoint PCH\n");
  62                 drm_WARN_ON(&dev_priv->drm,
  63                             !IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv));
  64                 return PCH_SPT;
  65         case INTEL_PCH_SPT_LP_DEVICE_ID_TYPE:
  66                 drm_dbg_kms(&dev_priv->drm, "Found SunrisePoint LP PCH\n");
  67                 drm_WARN_ON(&dev_priv->drm,
  68                             !IS_SKYLAKE(dev_priv) &&
  69                             !IS_KABYLAKE(dev_priv) &&
  70                             !IS_COFFEELAKE(dev_priv) &&
  71                             !IS_COMETLAKE(dev_priv));
  72                 return PCH_SPT;
  73         case INTEL_PCH_KBP_DEVICE_ID_TYPE:
  74                 drm_dbg_kms(&dev_priv->drm, "Found Kaby Lake PCH (KBP)\n");
  75                 drm_WARN_ON(&dev_priv->drm,
  76                             !IS_SKYLAKE(dev_priv) &&
  77                             !IS_KABYLAKE(dev_priv) &&
  78                             !IS_COFFEELAKE(dev_priv) &&
  79                             !IS_COMETLAKE(dev_priv));
  80                 /* KBP is SPT compatible */
  81                 return PCH_SPT;
  82         case INTEL_PCH_CNP_DEVICE_ID_TYPE:
  83                 drm_dbg_kms(&dev_priv->drm, "Found Cannon Lake PCH (CNP)\n");
  84                 drm_WARN_ON(&dev_priv->drm,
  85                             !IS_COFFEELAKE(dev_priv) &&
  86                             !IS_COMETLAKE(dev_priv));
  87                 return PCH_CNP;
  88         case INTEL_PCH_CNP_LP_DEVICE_ID_TYPE:
  89                 drm_dbg_kms(&dev_priv->drm,
  90                             "Found Cannon Lake LP PCH (CNP-LP)\n");
  91                 drm_WARN_ON(&dev_priv->drm,
  92                             !IS_COFFEELAKE(dev_priv) &&
  93                             !IS_COMETLAKE(dev_priv));
  94                 return PCH_CNP;
  95         case INTEL_PCH_CMP_DEVICE_ID_TYPE:
  96         case INTEL_PCH_CMP2_DEVICE_ID_TYPE:
  97                 drm_dbg_kms(&dev_priv->drm, "Found Comet Lake PCH (CMP)\n");
  98                 drm_WARN_ON(&dev_priv->drm,
  99                             !IS_COFFEELAKE(dev_priv) &&
 100                             !IS_COMETLAKE(dev_priv) &&
 101                             !IS_ROCKETLAKE(dev_priv));
 102                 /* CometPoint is CNP Compatible */
 103                 return PCH_CNP;
 104         case INTEL_PCH_CMP_V_DEVICE_ID_TYPE:
 105                 drm_dbg_kms(&dev_priv->drm, "Found Comet Lake V PCH (CMP-V)\n");
 106                 drm_WARN_ON(&dev_priv->drm,
 107                             !IS_COFFEELAKE(dev_priv) &&
 108                             !IS_COMETLAKE(dev_priv));
 109                 /* Comet Lake V PCH is based on KBP, which is SPT compatible */
 110                 return PCH_SPT;
 111         case INTEL_PCH_ICP_DEVICE_ID_TYPE:
 112         case INTEL_PCH_ICP2_DEVICE_ID_TYPE:
 113                 drm_dbg_kms(&dev_priv->drm, "Found Ice Lake PCH\n");
 114                 drm_WARN_ON(&dev_priv->drm, !IS_ICELAKE(dev_priv));
 115                 return PCH_ICP;
 116         case INTEL_PCH_MCC_DEVICE_ID_TYPE:
 117                 drm_dbg_kms(&dev_priv->drm, "Found Mule Creek Canyon PCH\n");
 118                 drm_WARN_ON(&dev_priv->drm, !IS_JSL_EHL(dev_priv));
 119                 return PCH_MCC;
 120         case INTEL_PCH_TGP_DEVICE_ID_TYPE:
 121         case INTEL_PCH_TGP2_DEVICE_ID_TYPE:
 122                 drm_dbg_kms(&dev_priv->drm, "Found Tiger Lake LP PCH\n");
 123                 drm_WARN_ON(&dev_priv->drm, !IS_TIGERLAKE(dev_priv) &&
 124                             !IS_ROCKETLAKE(dev_priv) &&
 125                             !IS_GEN9_BC(dev_priv));
 126                 return PCH_TGP;
 127         case INTEL_PCH_JSP_DEVICE_ID_TYPE:
 128                 drm_dbg_kms(&dev_priv->drm, "Found Jasper Lake PCH\n");
 129                 drm_WARN_ON(&dev_priv->drm, !IS_JSL_EHL(dev_priv));
 130                 return PCH_JSP;
 131         case INTEL_PCH_ADP_DEVICE_ID_TYPE:
 132         case INTEL_PCH_ADP2_DEVICE_ID_TYPE:
 133         case INTEL_PCH_ADP3_DEVICE_ID_TYPE:
 134         case INTEL_PCH_ADP4_DEVICE_ID_TYPE:
 135                 drm_dbg_kms(&dev_priv->drm, "Found Alder Lake PCH\n");
 136                 drm_WARN_ON(&dev_priv->drm, !IS_ALDERLAKE_S(dev_priv) &&
 137                             !IS_ALDERLAKE_P(dev_priv));
 138                 return PCH_ADP;
 139         default:
 140                 return PCH_NONE;
 141         }
 142 }
 143
 144 static bool intel_is_virt_pch(unsigned short id,
 145                               unsigned short svendor, unsigned short sdevice)
 146 {
 147         return (id == INTEL_PCH_P2X_DEVICE_ID_TYPE ||
 148                 id == INTEL_PCH_P3X_DEVICE_ID_TYPE ||
 149                 (id == INTEL_PCH_QEMU_DEVICE_ID_TYPE &&
 150                  svendor == PCI_SUBVENDOR_ID_REDHAT_QUMRANET &&
 151                  sdevice == PCI_SUBDEVICE_ID_QEMU));
 152 }
 153
 154 static void
 155 intel_virt_detect_pch(const struct drm_i915_private *dev_priv,
 156                       unsigned short *pch_id, enum intel_pch *pch_type)
 157 {
 158         unsigned short id = 0;
 159
 160         /*
 161          * In a virtualized passthrough environment we can be in a
 162          * setup where the ISA bridge is not able to be passed through.
 163          * In this case, a south bridge can be emulated and we have to
 164          * make an educated guess as to which PCH is really there.
 165          */
 166
 167         if (IS_ALDERLAKE_S(dev_priv) || IS_ALDERLAKE_P(dev_priv))
 168                 id = INTEL_PCH_ADP_DEVICE_ID_TYPE;
 169         else if (IS_TIGERLAKE(dev_priv) || IS_ROCKETLAKE(dev_priv))
 170                 id = INTEL_PCH_TGP_DEVICE_ID_TYPE;
 171         else if (IS_JSL_EHL(dev_priv))
 172                 id = INTEL_PCH_MCC_DEVICE_ID_TYPE;
 173         else if (IS_ICELAKE(dev_priv))
 174                 id = INTEL_PCH_ICP_DEVICE_ID_TYPE;
 175         else if (IS_COFFEELAKE(dev_priv) ||
 176                  IS_COMETLAKE(dev_priv))
 177                 id = INTEL_PCH_CNP_DEVICE_ID_TYPE;
 178         else if (IS_KABYLAKE(dev_priv) || IS_SKYLAKE(dev_priv))
 179                 id = INTEL_PCH_SPT_DEVICE_ID_TYPE;
 180         else if (IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv))
 181                 id = INTEL_PCH_LPT_LP_DEVICE_ID_TYPE;
 182         else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
 183                 id = INTEL_PCH_LPT_DEVICE_ID_TYPE;
 184         else if (GRAPHICS_VER(dev_priv) == 6 || IS_IVYBRIDGE(dev_priv))
 185                 id = INTEL_PCH_CPT_DEVICE_ID_TYPE;
 186         else if (GRAPHICS_VER(dev_priv) == 5)
 187                 id = INTEL_PCH_IBX_DEVICE_ID_TYPE;
 188
 189         if (id)
 190                 drm_dbg_kms(&dev_priv->drm, "Assuming PCH ID %04x\n", id);
 191         else
 192                 drm_dbg_kms(&dev_priv->drm, "Assuming no PCH\n");
 193
 194         *pch_type = intel_pch_type(dev_priv, id);
 195
 196         /* Sanity check virtual PCH id */
 197         if (drm_WARN_ON(&dev_priv->drm,
 198                         id && *pch_type == PCH_NONE))
 199                 id = 0;
 200
 201         *pch_id = id;
 202 }
 203
 204 void intel_detect_pch(struct drm_i915_private *dev_priv)
 205 {
 206         struct pci_dev *pch = NULL;
 207         unsigned short id;
 208         enum intel_pch pch_type;
 209
 210         /* DG1 has south engine display on the same PCI device */
 211         if (IS_DG1(dev_priv)) {
 212                 dev_priv->pch_type = PCH_DG1;
 213                 return;
 214         } else if (IS_DG2(dev_priv)) {
 215                 dev_priv->pch_type = PCH_DG2;
 216                 return;
 217         }
 218
 219         /*
 220          * The reason to probe ISA bridge instead of Dev31:Fun0 is to
 221          * make graphics device passthrough work easy for VMM, that only
 222          * need to expose ISA bridge to let driver know the real hardware
 223          * underneath. This is a requirement from virtualization team.
 224          *
 225          * In some virtualized environments (e.g. XEN), there is irrelevant
 226          * ISA bridge in the system. To work reliably, we should scan trhough
 227          * all the ISA bridge devices and check for the first match, instead
 228          * of only checking the first one.
 229          */
 230         while ((pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, pch))) {
 231                 if (pch->vendor != PCI_VENDOR_ID_INTEL)
 232                         continue;
 233
 234                 id = pch->device & INTEL_PCH_DEVICE_ID_MASK;
 235
 236                 pch_type = intel_pch_type(dev_priv, id);
 237                 if (pch_type != PCH_NONE) {
 238                         dev_priv->pch_type = pch_type;
 239                         dev_priv->pch_id = id;
 240                         break;
 241                 } else if (intel_is_virt_pch(id, pch->subsystem_vendor,
 242                                              pch->subsystem_device)) {
 243                         intel_virt_detect_pch(dev_priv, &id, &pch_type);
 244                         dev_priv->pch_type = pch_type;
 245                         dev_priv->pch_id = id;
 246                         break;
 247                 }
 248         }
 249
 250         /*
 251          * Use PCH_NOP (PCH but no South Display) for PCH platforms without
 252          * display.
 253          */
 254         if (pch && !HAS_DISPLAY(dev_priv)) {
 255                 drm_dbg_kms(&dev_priv->drm,
 256                             "Display disabled, reverting to NOP PCH\n");
 257                 dev_priv->pch_type = PCH_NOP;
 258                 dev_priv->pch_id = 0;
 259         } else if (!pch) {
 260                 if (i915_run_as_guest() && HAS_DISPLAY(dev_priv)) {
 261                         intel_virt_detect_pch(dev_priv, &id, &pch_type);
 262                         dev_priv->pch_type = pch_type;
 263                         dev_priv->pch_id = id;
 264                 } else {
 265                         drm_dbg_kms(&dev_priv->drm, "No PCH found.\n");
 266                 }
 267         }
 268
 269         pci_dev_put(pch);
 270 }