GNU Linux-libre 5.10.215-gnu1
[releases.git] / 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 "intel_pch.h"
8
9 /* Map PCH device id to PCH type, or PCH_NONE if unknown. */
10 static enum intel_pch
11 intel_pch_type(const struct drm_i915_private *dev_priv, unsigned short id)
12 {
13         switch (id) {
14         case INTEL_PCH_IBX_DEVICE_ID_TYPE:
15                 drm_dbg_kms(&dev_priv->drm, "Found Ibex Peak PCH\n");
16                 drm_WARN_ON(&dev_priv->drm, !IS_GEN(dev_priv, 5));
17                 return PCH_IBX;
18         case INTEL_PCH_CPT_DEVICE_ID_TYPE:
19                 drm_dbg_kms(&dev_priv->drm, "Found CougarPoint PCH\n");
20                 drm_WARN_ON(&dev_priv->drm,
21                             !IS_GEN(dev_priv, 6) && !IS_IVYBRIDGE(dev_priv));
22                 return PCH_CPT;
23         case INTEL_PCH_PPT_DEVICE_ID_TYPE:
24                 drm_dbg_kms(&dev_priv->drm, "Found PantherPoint PCH\n");
25                 drm_WARN_ON(&dev_priv->drm,
26                             !IS_GEN(dev_priv, 6) && !IS_IVYBRIDGE(dev_priv));
27                 /* PantherPoint is CPT compatible */
28                 return PCH_CPT;
29         case INTEL_PCH_LPT_DEVICE_ID_TYPE:
30                 drm_dbg_kms(&dev_priv->drm, "Found LynxPoint PCH\n");
31                 drm_WARN_ON(&dev_priv->drm,
32                             !IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
33                 drm_WARN_ON(&dev_priv->drm,
34                             IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv));
35                 return PCH_LPT;
36         case INTEL_PCH_LPT_LP_DEVICE_ID_TYPE:
37                 drm_dbg_kms(&dev_priv->drm, "Found LynxPoint LP PCH\n");
38                 drm_WARN_ON(&dev_priv->drm,
39                             !IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
40                 drm_WARN_ON(&dev_priv->drm,
41                             !IS_HSW_ULT(dev_priv) && !IS_BDW_ULT(dev_priv));
42                 return PCH_LPT;
43         case INTEL_PCH_WPT_DEVICE_ID_TYPE:
44                 drm_dbg_kms(&dev_priv->drm, "Found WildcatPoint PCH\n");
45                 drm_WARN_ON(&dev_priv->drm,
46                             !IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
47                 drm_WARN_ON(&dev_priv->drm,
48                             IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv));
49                 /* WildcatPoint is LPT compatible */
50                 return PCH_LPT;
51         case INTEL_PCH_WPT_LP_DEVICE_ID_TYPE:
52                 drm_dbg_kms(&dev_priv->drm, "Found WildcatPoint LP PCH\n");
53                 drm_WARN_ON(&dev_priv->drm,
54                             !IS_HASWELL(dev_priv) && !IS_BROADWELL(dev_priv));
55                 drm_WARN_ON(&dev_priv->drm,
56                             !IS_HSW_ULT(dev_priv) && !IS_BDW_ULT(dev_priv));
57                 /* WildcatPoint is LPT compatible */
58                 return PCH_LPT;
59         case INTEL_PCH_SPT_DEVICE_ID_TYPE:
60                 drm_dbg_kms(&dev_priv->drm, "Found SunrisePoint PCH\n");
61                 drm_WARN_ON(&dev_priv->drm,
62                             !IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv));
63                 return PCH_SPT;
64         case INTEL_PCH_SPT_LP_DEVICE_ID_TYPE:
65                 drm_dbg_kms(&dev_priv->drm, "Found SunrisePoint LP PCH\n");
66                 drm_WARN_ON(&dev_priv->drm,
67                             !IS_SKYLAKE(dev_priv) &&
68                             !IS_KABYLAKE(dev_priv) &&
69                             !IS_COFFEELAKE(dev_priv) &&
70                             !IS_COMETLAKE(dev_priv));
71                 return PCH_SPT;
72         case INTEL_PCH_KBP_DEVICE_ID_TYPE:
73                 drm_dbg_kms(&dev_priv->drm, "Found Kaby Lake PCH (KBP)\n");
74                 drm_WARN_ON(&dev_priv->drm,
75                             !IS_SKYLAKE(dev_priv) &&
76                             !IS_KABYLAKE(dev_priv) &&
77                             !IS_COFFEELAKE(dev_priv) &&
78                             !IS_COMETLAKE(dev_priv));
79                 /* KBP is SPT compatible */
80                 return PCH_SPT;
81         case INTEL_PCH_CNP_DEVICE_ID_TYPE:
82                 drm_dbg_kms(&dev_priv->drm, "Found Cannon Lake PCH (CNP)\n");
83                 drm_WARN_ON(&dev_priv->drm,
84                             !IS_CANNONLAKE(dev_priv) &&
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_CANNONLAKE(dev_priv) &&
93                             !IS_COFFEELAKE(dev_priv) &&
94                             !IS_COMETLAKE(dev_priv));
95                 return PCH_CNP;
96         case INTEL_PCH_CMP_DEVICE_ID_TYPE:
97         case INTEL_PCH_CMP2_DEVICE_ID_TYPE:
98                 drm_dbg_kms(&dev_priv->drm, "Found Comet Lake PCH (CMP)\n");
99                 drm_WARN_ON(&dev_priv->drm,
100                             !IS_COFFEELAKE(dev_priv) &&
101                             !IS_COMETLAKE(dev_priv) &&
102                             !IS_ROCKETLAKE(dev_priv));
103                 /* CometPoint is CNP Compatible */
104                 return PCH_CNP;
105         case INTEL_PCH_CMP_V_DEVICE_ID_TYPE:
106                 drm_dbg_kms(&dev_priv->drm, "Found Comet Lake V PCH (CMP-V)\n");
107                 drm_WARN_ON(&dev_priv->drm,
108                             !IS_COFFEELAKE(dev_priv) &&
109                             !IS_COMETLAKE(dev_priv));
110                 /* Comet Lake V PCH is based on KBP, which is SPT compatible */
111                 return PCH_SPT;
112         case INTEL_PCH_ICP_DEVICE_ID_TYPE:
113         case INTEL_PCH_ICP2_DEVICE_ID_TYPE:
114                 drm_dbg_kms(&dev_priv->drm, "Found Ice Lake PCH\n");
115                 drm_WARN_ON(&dev_priv->drm, !IS_ICELAKE(dev_priv));
116                 return PCH_ICP;
117         case INTEL_PCH_MCC_DEVICE_ID_TYPE:
118                 drm_dbg_kms(&dev_priv->drm, "Found Mule Creek Canyon PCH\n");
119                 drm_WARN_ON(&dev_priv->drm, !IS_ELKHARTLAKE(dev_priv));
120                 return PCH_MCC;
121         case INTEL_PCH_TGP_DEVICE_ID_TYPE:
122         case INTEL_PCH_TGP2_DEVICE_ID_TYPE:
123                 drm_dbg_kms(&dev_priv->drm, "Found Tiger Lake LP PCH\n");
124                 drm_WARN_ON(&dev_priv->drm, !IS_TIGERLAKE(dev_priv) &&
125                             !IS_ROCKETLAKE(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_ELKHARTLAKE(dev_priv));
130                 return PCH_JSP;
131         default:
132                 return PCH_NONE;
133         }
134 }
135
136 static bool intel_is_virt_pch(unsigned short id,
137                               unsigned short svendor, unsigned short sdevice)
138 {
139         return (id == INTEL_PCH_P2X_DEVICE_ID_TYPE ||
140                 id == INTEL_PCH_P3X_DEVICE_ID_TYPE ||
141                 (id == INTEL_PCH_QEMU_DEVICE_ID_TYPE &&
142                  svendor == PCI_SUBVENDOR_ID_REDHAT_QUMRANET &&
143                  sdevice == PCI_SUBDEVICE_ID_QEMU));
144 }
145
146 static unsigned short
147 intel_virt_detect_pch(const struct drm_i915_private *dev_priv)
148 {
149         unsigned short id = 0;
150
151         /*
152          * In a virtualized passthrough environment we can be in a
153          * setup where the ISA bridge is not able to be passed through.
154          * In this case, a south bridge can be emulated and we have to
155          * make an educated guess as to which PCH is really there.
156          */
157
158         if (IS_TIGERLAKE(dev_priv) || IS_ROCKETLAKE(dev_priv))
159                 id = INTEL_PCH_TGP_DEVICE_ID_TYPE;
160         else if (IS_ELKHARTLAKE(dev_priv))
161                 id = INTEL_PCH_MCC_DEVICE_ID_TYPE;
162         else if (IS_ICELAKE(dev_priv))
163                 id = INTEL_PCH_ICP_DEVICE_ID_TYPE;
164         else if (IS_CANNONLAKE(dev_priv) ||
165                  IS_COFFEELAKE(dev_priv) ||
166                  IS_COMETLAKE(dev_priv))
167                 id = INTEL_PCH_CNP_DEVICE_ID_TYPE;
168         else if (IS_KABYLAKE(dev_priv) || IS_SKYLAKE(dev_priv))
169                 id = INTEL_PCH_SPT_DEVICE_ID_TYPE;
170         else if (IS_HSW_ULT(dev_priv) || IS_BDW_ULT(dev_priv))
171                 id = INTEL_PCH_LPT_LP_DEVICE_ID_TYPE;
172         else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
173                 id = INTEL_PCH_LPT_DEVICE_ID_TYPE;
174         else if (IS_GEN(dev_priv, 6) || IS_IVYBRIDGE(dev_priv))
175                 id = INTEL_PCH_CPT_DEVICE_ID_TYPE;
176         else if (IS_GEN(dev_priv, 5))
177                 id = INTEL_PCH_IBX_DEVICE_ID_TYPE;
178
179         if (id)
180                 drm_dbg_kms(&dev_priv->drm, "Assuming PCH ID %04x\n", id);
181         else
182                 drm_dbg_kms(&dev_priv->drm, "Assuming no PCH\n");
183
184         return id;
185 }
186
187 void intel_detect_pch(struct drm_i915_private *dev_priv)
188 {
189         struct pci_dev *pch = NULL;
190
191         /* DG1 has south engine display on the same PCI device */
192         if (IS_DG1(dev_priv)) {
193                 dev_priv->pch_type = PCH_DG1;
194                 return;
195         }
196
197         /*
198          * The reason to probe ISA bridge instead of Dev31:Fun0 is to
199          * make graphics device passthrough work easy for VMM, that only
200          * need to expose ISA bridge to let driver know the real hardware
201          * underneath. This is a requirement from virtualization team.
202          *
203          * In some virtualized environments (e.g. XEN), there is irrelevant
204          * ISA bridge in the system. To work reliably, we should scan trhough
205          * all the ISA bridge devices and check for the first match, instead
206          * of only checking the first one.
207          */
208         while ((pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, pch))) {
209                 unsigned short id;
210                 enum intel_pch pch_type;
211
212                 if (pch->vendor != PCI_VENDOR_ID_INTEL)
213                         continue;
214
215                 id = pch->device & INTEL_PCH_DEVICE_ID_MASK;
216
217                 pch_type = intel_pch_type(dev_priv, id);
218                 if (pch_type != PCH_NONE) {
219                         dev_priv->pch_type = pch_type;
220                         dev_priv->pch_id = id;
221                         break;
222                 } else if (intel_is_virt_pch(id, pch->subsystem_vendor,
223                                              pch->subsystem_device)) {
224                         id = intel_virt_detect_pch(dev_priv);
225                         pch_type = intel_pch_type(dev_priv, id);
226
227                         /* Sanity check virtual PCH id */
228                         if (drm_WARN_ON(&dev_priv->drm,
229                                         id && pch_type == PCH_NONE))
230                                 id = 0;
231
232                         dev_priv->pch_type = pch_type;
233                         dev_priv->pch_id = id;
234                         break;
235                 }
236         }
237
238         /*
239          * Use PCH_NOP (PCH but no South Display) for PCH platforms without
240          * display.
241          */
242         if (pch && !HAS_DISPLAY(dev_priv)) {
243                 drm_dbg_kms(&dev_priv->drm,
244                             "Display disabled, reverting to NOP PCH\n");
245                 dev_priv->pch_type = PCH_NOP;
246                 dev_priv->pch_id = 0;
247         }
248
249         if (!pch)
250                 drm_dbg_kms(&dev_priv->drm, "No PCH found.\n");
251
252         pci_dev_put(pch);
253 }