| // SPDX-License-Identifier: MIT |
| /* |
| * Copyright 2019 Intel Corporation. |
| */ |
| |
| #include "i915_drv.h" |
| #include "intel_pch.h" |
| |
| /* Map PCH device id to PCH type, or PCH_NONE if unknown. */ |
| static enum intel_pch |
| intel_pch_type(const struct drm_i915_private *dev_priv, unsigned short id) |
| { |
| switch (id) { |
| case INTEL_PCH_IBX_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found Ibex Peak PCH\n"); |
| WARN_ON(!IS_GEN(dev_priv, 5)); |
| return PCH_IBX; |
| case INTEL_PCH_CPT_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found CougarPoint PCH\n"); |
| WARN_ON(!IS_GEN(dev_priv, 6) && !IS_IVYBRIDGE(dev_priv)); |
| return PCH_CPT; |
| case INTEL_PCH_PPT_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found PantherPoint PCH\n"); |
| WARN_ON(!IS_GEN(dev_priv, 6) && !IS_IVYBRIDGE(dev_priv)); |
| /* PantherPoint is CPT compatible */ |
| return PCH_CPT; |
| case INTEL_PCH_LPT_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found LynxPoint PCH\n"); |
| WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv)); |
| WARN_ON(IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv)); |
| return PCH_LPT; |
| case INTEL_PCH_LPT_LP_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found LynxPoint LP PCH\n"); |
| WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv)); |
| WARN_ON(!IS_HSW_ULT(dev_priv) && !IS_BDW_ULT(dev_priv)); |
| return PCH_LPT; |
| case INTEL_PCH_WPT_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found WildcatPoint PCH\n"); |
| WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv)); |
| WARN_ON(IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv)); |
| /* WildcatPoint is LPT compatible */ |
| return PCH_LPT; |
| case INTEL_PCH_WPT_LP_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found WildcatPoint LP PCH\n"); |
| WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv)); |
| WARN_ON(!IS_HSW_ULT(dev_priv) && !IS_BDW_ULT(dev_priv)); |
| /* WildcatPoint is LPT compatible */ |
| return PCH_LPT; |
| case INTEL_PCH_SPT_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found SunrisePoint PCH\n"); |
| WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv)); |
| return PCH_SPT; |
| case INTEL_PCH_SPT_LP_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found SunrisePoint LP PCH\n"); |
| WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv) && |
| !IS_COFFEELAKE(dev_priv)); |
| return PCH_SPT; |
| case INTEL_PCH_KBP_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found Kaby Lake PCH (KBP)\n"); |
| WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv) && |
| !IS_COFFEELAKE(dev_priv)); |
| /* KBP is SPT compatible */ |
| return PCH_SPT; |
| case INTEL_PCH_CNP_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found Cannon Lake PCH (CNP)\n"); |
| WARN_ON(!IS_CANNONLAKE(dev_priv) && !IS_COFFEELAKE(dev_priv)); |
| return PCH_CNP; |
| case INTEL_PCH_CNP_LP_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, |
| "Found Cannon Lake LP PCH (CNP-LP)\n"); |
| WARN_ON(!IS_CANNONLAKE(dev_priv) && !IS_COFFEELAKE(dev_priv)); |
| return PCH_CNP; |
| case INTEL_PCH_CMP_DEVICE_ID_TYPE: |
| case INTEL_PCH_CMP2_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found Comet Lake PCH (CMP)\n"); |
| WARN_ON(!IS_COFFEELAKE(dev_priv)); |
| /* CometPoint is CNP Compatible */ |
| return PCH_CNP; |
| case INTEL_PCH_CMP_V_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found Comet Lake V PCH (CMP-V)\n"); |
| WARN_ON(!IS_COFFEELAKE(dev_priv)); |
| /* Comet Lake V PCH is based on KBP, which is SPT compatible */ |
| return PCH_SPT; |
| case INTEL_PCH_ICP_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found Ice Lake PCH\n"); |
| WARN_ON(!IS_ICELAKE(dev_priv)); |
| return PCH_ICP; |
| case INTEL_PCH_MCC_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found Mule Creek Canyon PCH\n"); |
| WARN_ON(!IS_ELKHARTLAKE(dev_priv)); |
| return PCH_MCC; |
| case INTEL_PCH_TGP_DEVICE_ID_TYPE: |
| case INTEL_PCH_TGP2_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found Tiger Lake LP PCH\n"); |
| WARN_ON(!IS_TIGERLAKE(dev_priv)); |
| return PCH_TGP; |
| case INTEL_PCH_JSP_DEVICE_ID_TYPE: |
| case INTEL_PCH_JSP2_DEVICE_ID_TYPE: |
| drm_dbg_kms(&dev_priv->drm, "Found Jasper Lake PCH\n"); |
| WARN_ON(!IS_ELKHARTLAKE(dev_priv)); |
| return PCH_JSP; |
| default: |
| return PCH_NONE; |
| } |
| } |
| |
| static bool intel_is_virt_pch(unsigned short id, |
| unsigned short svendor, unsigned short sdevice) |
| { |
| return (id == INTEL_PCH_P2X_DEVICE_ID_TYPE || |
| id == INTEL_PCH_P3X_DEVICE_ID_TYPE || |
| (id == INTEL_PCH_QEMU_DEVICE_ID_TYPE && |
| svendor == PCI_SUBVENDOR_ID_REDHAT_QUMRANET && |
| sdevice == PCI_SUBDEVICE_ID_QEMU)); |
| } |
| |
| static unsigned short |
| intel_virt_detect_pch(const struct drm_i915_private *dev_priv) |
| { |
| unsigned short id = 0; |
| |
| /* |
| * In a virtualized passthrough environment we can be in a |
| * setup where the ISA bridge is not able to be passed through. |
| * In this case, a south bridge can be emulated and we have to |
| * make an educated guess as to which PCH is really there. |
| */ |
| |
| if (IS_TIGERLAKE(dev_priv)) |
| id = INTEL_PCH_TGP_DEVICE_ID_TYPE; |
| else if (IS_ELKHARTLAKE(dev_priv)) |
| id = INTEL_PCH_MCC_DEVICE_ID_TYPE; |
| else if (IS_ICELAKE(dev_priv)) |
| id = INTEL_PCH_ICP_DEVICE_ID_TYPE; |
| else if (IS_CANNONLAKE(dev_priv) || IS_COFFEELAKE(dev_priv)) |
| id = INTEL_PCH_CNP_DEVICE_ID_TYPE; |
| else if (IS_KABYLAKE(dev_priv) || IS_SKYLAKE(dev_priv)) |
| id = INTEL_PCH_SPT_DEVICE_ID_TYPE; |
| else if (IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv)) |
| id = INTEL_PCH_LPT_LP_DEVICE_ID_TYPE; |
| else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) |
| id = INTEL_PCH_LPT_DEVICE_ID_TYPE; |
| else if (IS_GEN(dev_priv, 6) || IS_IVYBRIDGE(dev_priv)) |
| id = INTEL_PCH_CPT_DEVICE_ID_TYPE; |
| else if (IS_GEN(dev_priv, 5)) |
| id = INTEL_PCH_IBX_DEVICE_ID_TYPE; |
| |
| if (id) |
| drm_dbg_kms(&dev_priv->drm, "Assuming PCH ID %04x\n", id); |
| else |
| drm_dbg_kms(&dev_priv->drm, "Assuming no PCH\n"); |
| |
| return id; |
| } |
| |
| void intel_detect_pch(struct drm_i915_private *dev_priv) |
| { |
| struct pci_dev *pch = NULL; |
| |
| /* |
| * The reason to probe ISA bridge instead of Dev31:Fun0 is to |
| * make graphics device passthrough work easy for VMM, that only |
| * need to expose ISA bridge to let driver know the real hardware |
| * underneath. This is a requirement from virtualization team. |
| * |
| * In some virtualized environments (e.g. XEN), there is irrelevant |
| * ISA bridge in the system. To work reliably, we should scan trhough |
| * all the ISA bridge devices and check for the first match, instead |
| * of only checking the first one. |
| */ |
| while ((pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, pch))) { |
| unsigned short id; |
| enum intel_pch pch_type; |
| |
| if (pch->vendor != PCI_VENDOR_ID_INTEL) |
| continue; |
| |
| id = pch->device & INTEL_PCH_DEVICE_ID_MASK; |
| |
| pch_type = intel_pch_type(dev_priv, id); |
| if (pch_type != PCH_NONE) { |
| dev_priv->pch_type = pch_type; |
| dev_priv->pch_id = id; |
| break; |
| } else if (intel_is_virt_pch(id, pch->subsystem_vendor, |
| pch->subsystem_device)) { |
| id = intel_virt_detect_pch(dev_priv); |
| pch_type = intel_pch_type(dev_priv, id); |
| |
| /* Sanity check virtual PCH id */ |
| if (WARN_ON(id && pch_type == PCH_NONE)) |
| id = 0; |
| |
| dev_priv->pch_type = pch_type; |
| dev_priv->pch_id = id; |
| break; |
| } |
| } |
| |
| /* |
| * Use PCH_NOP (PCH but no South Display) for PCH platforms without |
| * display. |
| */ |
| if (pch && !HAS_DISPLAY(dev_priv)) { |
| drm_dbg_kms(&dev_priv->drm, |
| "Display disabled, reverting to NOP PCH\n"); |
| dev_priv->pch_type = PCH_NOP; |
| dev_priv->pch_id = 0; |
| } |
| |
| if (!pch) |
| drm_dbg_kms(&dev_priv->drm, "No PCH found.\n"); |
| |
| pci_dev_put(pch); |
| } |