Abstract the rather self-contained piece of code from i915_drv.[ch]. No
functional changes.
Cc: José Roberto de Souza <jose.souza@xxxxxxxxx>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
drivers/gpu/drm/i915/Makefile | 1 +
drivers/gpu/drm/i915/i915_drv.c | 194 -----------------------------
drivers/gpu/drm/i915/i915_drv.h | 60 +--------
drivers/gpu/drm/i915/intel_pch.c | 201 +++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_pch.h | 73 +++++++++++
5 files changed, 276 insertions(+), 253 deletions(-)
create mode 100644 drivers/gpu/drm/i915/intel_pch.c
create mode 100644 drivers/gpu/drm/i915/intel_pch.h
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 8fe157f71617..7f710415a525 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -48,6 +48,7 @@ i915-y += i915_drv.o \
i915_sysfs.o \
intel_csr.o \
intel_device_info.o \
+ intel_pch.o \
intel_pm.o \
intel_runtime_pm.o \
intel_sideband.o \
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 535209ee4741..5807c1a0dab1 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -150,200 +150,6 @@ __i915_printk(struct drm_i915_private *dev_priv, const char *level,
}
}
-/* 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_DEBUG_KMS("Found Ibex Peak PCH\n");
- WARN_ON(!IS_GEN(dev_priv, 5));
- return PCH_IBX;
- case INTEL_PCH_CPT_DEVICE_ID_TYPE:
- DRM_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("Found SunrisePoint LP PCH\n");
- WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv));
- return PCH_SPT;
- case INTEL_PCH_KBP_DEVICE_ID_TYPE:
- DRM_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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:
- DRM_DEBUG_KMS("Found Comet Lake PCH (CMP)\n");
- WARN_ON(!IS_COFFEELAKE(dev_priv));
- /* CometPoint is CNP Compatible */
- return PCH_CNP;
- case INTEL_PCH_ICP_DEVICE_ID_TYPE:
- DRM_DEBUG_KMS("Found Ice Lake PCH\n");
- WARN_ON(!IS_ICELAKE(dev_priv));
- return PCH_ICP;
- case INTEL_PCH_MCC_DEVICE_ID_TYPE:
- case INTEL_PCH_MCC2_DEVICE_ID_TYPE:
- DRM_DEBUG_KMS("Found Mule Creek Canyon PCH\n");
- WARN_ON(!IS_ELKHARTLAKE(dev_priv));
- return PCH_MCC;
- case INTEL_PCH_TGP_DEVICE_ID_TYPE:
- DRM_DEBUG_KMS("Found Tiger Lake LP PCH\n");
- WARN_ON(!IS_TIGERLAKE(dev_priv));
- return PCH_TGP;
- 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_DEBUG_KMS("Assuming PCH ID %04x\n", id);
- else
- DRM_DEBUG_KMS("Assuming no PCH\n");
-
- return id;
-}
-
-static 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_DEBUG_KMS("Display disabled, reverting to NOP PCH\n");
- dev_priv->pch_type = PCH_NOP;
- dev_priv->pch_id = 0;
- }
-
- if (!pch)
- DRM_DEBUG_KMS("No PCH found.\n");
-
- pci_dev_put(pch);
-}
-
static int i915_getparam_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 7d424ddd3523..43b0d149d114 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -77,6 +77,7 @@
#include "gt/uc/intel_uc.h"
#include "intel_device_info.h"
+#include "intel_pch.h"
#include "intel_runtime_pm.h"
#include "intel_uncore.h"
#include "intel_wakeref.h"
@@ -528,25 +529,6 @@ struct i915_psr {
u16 su_x_granularity;
};
-/*
- * Sorted by south display engine compatibility.
- * If the new PCH comes with a south display engine that is not
- * inherited from the latest item, please do not add it to the
- * end. Instead, add it right after its "parent" PCH.
- */
-enum intel_pch {
- PCH_NOP = -1, /* PCH without south display */
- PCH_NONE = 0, /* No PCH present */
- PCH_IBX, /* Ibexpeak PCH */
- PCH_CPT, /* Cougarpoint/Pantherpoint PCH */
- PCH_LPT, /* Lynxpoint/Wildcatpoint PCH */
- PCH_SPT, /* Sunrisepoint/Kaby Lake PCH */
- PCH_CNP, /* Cannon/Comet Lake PCH */
- PCH_ICP, /* Ice Lake PCH */
- PCH_MCC, /* Mule Creek Canyon PCH */
- PCH_TGP, /* Tiger Lake PCH */
-};
-
#define QUIRK_LVDS_SSC_DISABLE (1<<1)
#define QUIRK_INVERT_BRIGHTNESS (1<<2)
#define QUIRK_BACKLIGHT_PRESENT (1<<3)
@@ -2291,46 +2273,6 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
#define HAS_GLOBAL_MOCS_REGISTERS(dev_priv) (INTEL_INFO(dev_priv)->has_global_mocs)
-#define INTEL_PCH_DEVICE_ID_MASK 0xff80
-#define INTEL_PCH_IBX_DEVICE_ID_TYPE 0x3b00
-#define INTEL_PCH_CPT_DEVICE_ID_TYPE 0x1c00
-#define INTEL_PCH_PPT_DEVICE_ID_TYPE 0x1e00
-#define INTEL_PCH_LPT_DEVICE_ID_TYPE 0x8c00
-#define INTEL_PCH_LPT_LP_DEVICE_ID_TYPE 0x9c00
-#define INTEL_PCH_WPT_DEVICE_ID_TYPE 0x8c80
-#define INTEL_PCH_WPT_LP_DEVICE_ID_TYPE 0x9c80
-#define INTEL_PCH_SPT_DEVICE_ID_TYPE 0xA100
-#define INTEL_PCH_SPT_LP_DEVICE_ID_TYPE 0x9D00
-#define INTEL_PCH_KBP_DEVICE_ID_TYPE 0xA280
-#define INTEL_PCH_CNP_DEVICE_ID_TYPE 0xA300
-#define INTEL_PCH_CNP_LP_DEVICE_ID_TYPE 0x9D80
-#define INTEL_PCH_CMP_DEVICE_ID_TYPE 0x0280
-#define INTEL_PCH_ICP_DEVICE_ID_TYPE 0x3480
-#define INTEL_PCH_MCC_DEVICE_ID_TYPE 0x4B00
-#define INTEL_PCH_MCC2_DEVICE_ID_TYPE 0x3880
-#define INTEL_PCH_TGP_DEVICE_ID_TYPE 0xA080
-#define INTEL_PCH_P2X_DEVICE_ID_TYPE 0x7100
-#define INTEL_PCH_P3X_DEVICE_ID_TYPE 0x7000
-#define INTEL_PCH_QEMU_DEVICE_ID_TYPE 0x2900 /* qemu q35 has 2918 */
-
-#define INTEL_PCH_TYPE(dev_priv) ((dev_priv)->pch_type)
-#define INTEL_PCH_ID(dev_priv) ((dev_priv)->pch_id)
-#define HAS_PCH_MCC(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_MCC)
-#define HAS_PCH_TGP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_TGP)
-#define HAS_PCH_ICP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_ICP)
-#define HAS_PCH_CNP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_CNP)
-#define HAS_PCH_SPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_SPT)
-#define HAS_PCH_LPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_LPT)
-#define HAS_PCH_LPT_LP(dev_priv) \
- (INTEL_PCH_ID(dev_priv) == INTEL_PCH_LPT_LP_DEVICE_ID_TYPE || \
- INTEL_PCH_ID(dev_priv) == INTEL_PCH_WPT_LP_DEVICE_ID_TYPE)
-#define HAS_PCH_LPT_H(dev_priv) \
- (INTEL_PCH_ID(dev_priv) == INTEL_PCH_LPT_DEVICE_ID_TYPE || \
- INTEL_PCH_ID(dev_priv) == INTEL_PCH_WPT_DEVICE_ID_TYPE)
-#define HAS_PCH_CPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_CPT)
-#define HAS_PCH_IBX(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_IBX)
-#define HAS_PCH_NOP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_NOP)
-#define HAS_PCH_SPLIT(dev_priv) (INTEL_PCH_TYPE(dev_priv) != PCH_NONE)
#define HAS_GMCH(dev_priv) (INTEL_INFO(dev_priv)->display.has_gmch)
diff --git a/drivers/gpu/drm/i915/intel_pch.c b/drivers/gpu/drm/i915/intel_pch.c
new file mode 100644
index 000000000000..fa864d8f2b73
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_pch.c
@@ -0,0 +1,201 @@
+// 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_DEBUG_KMS("Found Ibex Peak PCH\n");
+ WARN_ON(!IS_GEN(dev_priv, 5));
+ return PCH_IBX;
+ case INTEL_PCH_CPT_DEVICE_ID_TYPE:
+ DRM_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("Found SunrisePoint LP PCH\n");
+ WARN_ON(!IS_SKYLAKE(dev_priv) && !IS_KABYLAKE(dev_priv));
+ return PCH_SPT;
+ case INTEL_PCH_KBP_DEVICE_ID_TYPE:
+ DRM_DEBUG_KMS("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_DEBUG_KMS("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_DEBUG_KMS("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:
+ DRM_DEBUG_KMS("Found Comet Lake PCH (CMP)\n");
+ WARN_ON(!IS_COFFEELAKE(dev_priv));
+ /* CometPoint is CNP Compatible */
+ return PCH_CNP;
+ case INTEL_PCH_ICP_DEVICE_ID_TYPE:
+ DRM_DEBUG_KMS("Found Ice Lake PCH\n");
+ WARN_ON(!IS_ICELAKE(dev_priv));
+ return PCH_ICP;
+ case INTEL_PCH_MCC_DEVICE_ID_TYPE:
+ case INTEL_PCH_MCC2_DEVICE_ID_TYPE:
+ DRM_DEBUG_KMS("Found Mule Creek Canyon PCH\n");
+ WARN_ON(!IS_ELKHARTLAKE(dev_priv));
+ return PCH_MCC;
+ case INTEL_PCH_TGP_DEVICE_ID_TYPE:
+ DRM_DEBUG_KMS("Found Tiger Lake LP PCH\n");
+ WARN_ON(!IS_TIGERLAKE(dev_priv));
+ return PCH_TGP;
+ 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_DEBUG_KMS("Assuming PCH ID %04x\n", id);
+ else
+ DRM_DEBUG_KMS("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_DEBUG_KMS("Display disabled, reverting to NOP PCH\n");
+ dev_priv->pch_type = PCH_NOP;
+ dev_priv->pch_id = 0;
+ }
+
+ if (!pch)
+ DRM_DEBUG_KMS("No PCH found.\n");
+
+ pci_dev_put(pch);
+}
diff --git a/drivers/gpu/drm/i915/intel_pch.h b/drivers/gpu/drm/i915/intel_pch.h
new file mode 100644
index 000000000000..e6a2d65f19c6
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_pch.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright 2019 Intel Corporation.
+ */
+
+#ifndef __INTEL_PCH__
+#define __INTEL_PCH__
+
+struct drm_i915_private;
+
+/*
+ * Sorted by south display engine compatibility.
+ * If the new PCH comes with a south display engine that is not
+ * inherited from the latest item, please do not add it to the
+ * end. Instead, add it right after its "parent" PCH.
+ */
+enum intel_pch {
+ PCH_NOP = -1, /* PCH without south display */
+ PCH_NONE = 0, /* No PCH present */
+ PCH_IBX, /* Ibexpeak PCH */
+ PCH_CPT, /* Cougarpoint/Pantherpoint PCH */
+ PCH_LPT, /* Lynxpoint/Wildcatpoint PCH */
+ PCH_SPT, /* Sunrisepoint/Kaby Lake PCH */
+ PCH_CNP, /* Cannon/Comet Lake PCH */
+ PCH_ICP, /* Ice Lake PCH */
+ PCH_MCC, /* Mule Creek Canyon PCH */
+ PCH_TGP, /* Tiger Lake PCH */
+};
+
+#define INTEL_PCH_DEVICE_ID_MASK 0xff80
+#define INTEL_PCH_IBX_DEVICE_ID_TYPE 0x3b00
+#define INTEL_PCH_CPT_DEVICE_ID_TYPE 0x1c00
+#define INTEL_PCH_PPT_DEVICE_ID_TYPE 0x1e00
+#define INTEL_PCH_LPT_DEVICE_ID_TYPE 0x8c00
+#define INTEL_PCH_LPT_LP_DEVICE_ID_TYPE 0x9c00
+#define INTEL_PCH_WPT_DEVICE_ID_TYPE 0x8c80
+#define INTEL_PCH_WPT_LP_DEVICE_ID_TYPE 0x9c80
+#define INTEL_PCH_SPT_DEVICE_ID_TYPE 0xA100
+#define INTEL_PCH_SPT_LP_DEVICE_ID_TYPE 0x9D00
+#define INTEL_PCH_KBP_DEVICE_ID_TYPE 0xA280
+#define INTEL_PCH_CNP_DEVICE_ID_TYPE 0xA300
+#define INTEL_PCH_CNP_LP_DEVICE_ID_TYPE 0x9D80
+#define INTEL_PCH_CMP_DEVICE_ID_TYPE 0x0280
+#define INTEL_PCH_ICP_DEVICE_ID_TYPE 0x3480
+#define INTEL_PCH_MCC_DEVICE_ID_TYPE 0x4B00
+#define INTEL_PCH_MCC2_DEVICE_ID_TYPE 0x3880
+#define INTEL_PCH_TGP_DEVICE_ID_TYPE 0xA080
+#define INTEL_PCH_P2X_DEVICE_ID_TYPE 0x7100
+#define INTEL_PCH_P3X_DEVICE_ID_TYPE 0x7000
+#define INTEL_PCH_QEMU_DEVICE_ID_TYPE 0x2900 /* qemu q35 has 2918 */
+
+#define INTEL_PCH_TYPE(dev_priv) ((dev_priv)->pch_type)
+#define INTEL_PCH_ID(dev_priv) ((dev_priv)->pch_id)
+#define HAS_PCH_MCC(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_MCC)
+#define HAS_PCH_TGP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_TGP)
+#define HAS_PCH_ICP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_ICP)
+#define HAS_PCH_CNP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_CNP)
+#define HAS_PCH_SPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_SPT)
+#define HAS_PCH_LPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_LPT)
+#define HAS_PCH_LPT_LP(dev_priv) \
+ (INTEL_PCH_ID(dev_priv) == INTEL_PCH_LPT_LP_DEVICE_ID_TYPE || \
+ INTEL_PCH_ID(dev_priv) == INTEL_PCH_WPT_LP_DEVICE_ID_TYPE)
+#define HAS_PCH_LPT_H(dev_priv) \
+ (INTEL_PCH_ID(dev_priv) == INTEL_PCH_LPT_DEVICE_ID_TYPE || \
+ INTEL_PCH_ID(dev_priv) == INTEL_PCH_WPT_DEVICE_ID_TYPE)
+#define HAS_PCH_CPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_CPT)
+#define HAS_PCH_IBX(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_IBX)
+#define HAS_PCH_NOP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_NOP)
+#define HAS_PCH_SPLIT(dev_priv) (INTEL_PCH_TYPE(dev_priv) != PCH_NONE)
+
+void intel_detect_pch(struct drm_i915_private *dev_priv);
+
+#endif /* __INTEL_PCH__ */
--
2.20.1
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