1 // SPDX-License-Identifier: MIT
3 * Copyright 2019 Intel Corporation.
9 /* Map PCH device id to PCH type, or PCH_NONE if unknown. */
11 intel_pch_type(const struct drm_i915_private *dev_priv, unsigned short id)
14 case INTEL_PCH_IBX_DEVICE_ID_TYPE:
15 DRM_DEBUG_KMS("Found Ibex Peak PCH\n");
16 WARN_ON(!IS_GEN(dev_priv, 5));
18 case INTEL_PCH_CPT_DEVICE_ID_TYPE:
19 DRM_DEBUG_KMS("Found CougarPoint PCH\n");
20 WARN_ON(!IS_GEN(dev_priv, 6) && !IS_IVYBRIDGE(dev_priv));
22 case INTEL_PCH_PPT_DEVICE_ID_TYPE:
23 DRM_DEBUG_KMS("Found PantherPoint PCH\n");
24 WARN_ON(!IS_GEN(dev_priv, 6) && !IS_IVYBRIDGE(dev_priv));
25 /* PantherPoint is CPT compatible */
27 case INTEL_PCH_LPT_DEVICE_ID_TYPE:
28 DRM_DEBUG_KMS("Found LynxPoint PCH\n");
29 WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
30 WARN_ON(IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv));
32 case INTEL_PCH_LPT_LP_DEVICE_ID_TYPE:
33 DRM_DEBUG_KMS("Found LynxPoint LP PCH\n");
34 WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
35 WARN_ON(!IS_HSW_ULT(dev_priv) && !IS_BDW_ULT(dev_priv));
37 case INTEL_PCH_WPT_DEVICE_ID_TYPE:
38 DRM_DEBUG_KMS("Found WildcatPoint PCH\n");
39 WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
40 WARN_ON(IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv));
41 /* WildcatPoint is LPT compatible */
43 case INTEL_PCH_WPT_LP_DEVICE_ID_TYPE:
44 DRM_DEBUG_KMS("Found WildcatPoint LP PCH\n");
45 WARN_ON(!IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
46 WARN_ON(!IS_HSW_ULT(dev_priv) && !IS_BDW_ULT(dev_priv));
47 /* WildcatPoint is LPT compatible */
49 case INTEL_PCH_SPT_DEVICE_ID_TYPE:
50 DRM_DEBUG_KMS("Found SunrisePoint PCH\n");
51 WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv));
53 case INTEL_PCH_SPT_LP_DEVICE_ID_TYPE:
54 DRM_DEBUG_KMS("Found SunrisePoint LP PCH\n");
55 WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv));
57 case INTEL_PCH_KBP_DEVICE_ID_TYPE:
58 DRM_DEBUG_KMS("Found Kaby Lake PCH (KBP)\n");
59 WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv) &&
60 !IS_COFFEELAKE(dev_priv));
61 /* KBP is SPT compatible */
63 case INTEL_PCH_CNP_DEVICE_ID_TYPE:
64 DRM_DEBUG_KMS("Found Cannon Lake PCH (CNP)\n");
65 WARN_ON(!IS_CANNONLAKE(dev_priv) && !IS_COFFEELAKE(dev_priv));
67 case INTEL_PCH_CNP_LP_DEVICE_ID_TYPE:
68 DRM_DEBUG_KMS("Found Cannon Lake LP PCH (CNP-LP)\n");
69 WARN_ON(!IS_CANNONLAKE(dev_priv) && !IS_COFFEELAKE(dev_priv));
71 case INTEL_PCH_CMP_DEVICE_ID_TYPE:
72 DRM_DEBUG_KMS("Found Comet Lake PCH (CMP)\n");
73 WARN_ON(!IS_COFFEELAKE(dev_priv));
74 /* CometPoint is CNP Compatible */
76 case INTEL_PCH_ICP_DEVICE_ID_TYPE:
77 DRM_DEBUG_KMS("Found Ice Lake PCH\n");
78 WARN_ON(!IS_ICELAKE(dev_priv));
80 case INTEL_PCH_MCC_DEVICE_ID_TYPE:
81 case INTEL_PCH_MCC2_DEVICE_ID_TYPE:
82 DRM_DEBUG_KMS("Found Mule Creek Canyon PCH\n");
83 WARN_ON(!IS_ELKHARTLAKE(dev_priv));
85 case INTEL_PCH_TGP_DEVICE_ID_TYPE:
86 DRM_DEBUG_KMS("Found Tiger Lake LP PCH\n");
87 WARN_ON(!IS_TIGERLAKE(dev_priv));
94 static bool intel_is_virt_pch(unsigned short id,
95 unsigned short svendor, unsigned short sdevice)
97 return (id == INTEL_PCH_P2X_DEVICE_ID_TYPE ||
98 id == INTEL_PCH_P3X_DEVICE_ID_TYPE ||
99 (id == INTEL_PCH_QEMU_DEVICE_ID_TYPE &&
100 svendor == PCI_SUBVENDOR_ID_REDHAT_QUMRANET &&
101 sdevice == PCI_SUBDEVICE_ID_QEMU));
104 static unsigned short
105 intel_virt_detect_pch(const struct drm_i915_private *dev_priv)
107 unsigned short id = 0;
110 * In a virtualized passthrough environment we can be in a
111 * setup where the ISA bridge is not able to be passed through.
112 * In this case, a south bridge can be emulated and we have to
113 * make an educated guess as to which PCH is really there.
116 if (IS_TIGERLAKE(dev_priv))
117 id = INTEL_PCH_TGP_DEVICE_ID_TYPE;
118 else if (IS_ELKHARTLAKE(dev_priv))
119 id = INTEL_PCH_MCC_DEVICE_ID_TYPE;
120 else if (IS_ICELAKE(dev_priv))
121 id = INTEL_PCH_ICP_DEVICE_ID_TYPE;
122 else if (IS_CANNONLAKE(dev_priv) || IS_COFFEELAKE(dev_priv))
123 id = INTEL_PCH_CNP_DEVICE_ID_TYPE;
124 else if (IS_KABYLAKE(dev_priv) || IS_SKYLAKE(dev_priv))
125 id = INTEL_PCH_SPT_DEVICE_ID_TYPE;
126 else if (IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv))
127 id = INTEL_PCH_LPT_LP_DEVICE_ID_TYPE;
128 else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
129 id = INTEL_PCH_LPT_DEVICE_ID_TYPE;
130 else if (IS_GEN(dev_priv, 6) || IS_IVYBRIDGE(dev_priv))
131 id = INTEL_PCH_CPT_DEVICE_ID_TYPE;
132 else if (IS_GEN(dev_priv, 5))
133 id = INTEL_PCH_IBX_DEVICE_ID_TYPE;
136 DRM_DEBUG_KMS("Assuming PCH ID %04x\n", id);
138 DRM_DEBUG_KMS("Assuming no PCH\n");
143 void intel_detect_pch(struct drm_i915_private *dev_priv)
145 struct pci_dev *pch = NULL;
148 * The reason to probe ISA bridge instead of Dev31:Fun0 is to
149 * make graphics device passthrough work easy for VMM, that only
150 * need to expose ISA bridge to let driver know the real hardware
151 * underneath. This is a requirement from virtualization team.
153 * In some virtualized environments (e.g. XEN), there is irrelevant
154 * ISA bridge in the system. To work reliably, we should scan trhough
155 * all the ISA bridge devices and check for the first match, instead
156 * of only checking the first one.
158 while ((pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, pch))) {
160 enum intel_pch pch_type;
162 if (pch->vendor != PCI_VENDOR_ID_INTEL)
165 id = pch->device & INTEL_PCH_DEVICE_ID_MASK;
167 pch_type = intel_pch_type(dev_priv, id);
168 if (pch_type != PCH_NONE) {
169 dev_priv->pch_type = pch_type;
170 dev_priv->pch_id = id;
172 } else if (intel_is_virt_pch(id, pch->subsystem_vendor,
173 pch->subsystem_device)) {
174 id = intel_virt_detect_pch(dev_priv);
175 pch_type = intel_pch_type(dev_priv, id);
177 /* Sanity check virtual PCH id */
178 if (WARN_ON(id && pch_type == PCH_NONE))
181 dev_priv->pch_type = pch_type;
182 dev_priv->pch_id = id;
188 * Use PCH_NOP (PCH but no South Display) for PCH platforms without
191 if (pch && !HAS_DISPLAY(dev_priv)) {
192 DRM_DEBUG_KMS("Display disabled, reverting to NOP PCH\n");
193 dev_priv->pch_type = PCH_NOP;
194 dev_priv->pch_id = 0;
198 DRM_DEBUG_KMS("No PCH found.\n");