[PATCH 18/38][SRU][G/H] drm/i915/tgl: Set subplatforms

[You-Sheng Yang]

From: José Roberto de Souza <jose.souza at intel.com>

BugLink: https://bugs.launchpad.net/bugs/1903969

There is no way to differentiate TGL-U from TGL-Y by the PCI ids as
some ids are available in both SKUs.
So here using the root device id in the PCI bus that iGPU is in
to differentiate between U and Y.

BSpec: 44455
Reviewed-by: Swathi Dhanavanthri <swathi.dhanavanthri at intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200807192629.64134-1-jose.souza@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
(cherry picked from commit 1d3cc7ab2b00f849c94bd7e5fcffc7899dc4039a)
Signed-off-by: You-Sheng Yang <vicamo.yang at canonical.com>
---
 drivers/gpu/drm/i915/i915_drv.h          |  6 ++++++
 drivers/gpu/drm/i915/i915_reg.h          |  6 ++++++
 drivers/gpu/drm/i915/intel_device_info.c | 19 +++++++++++++++++++
 3 files changed, 31 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 26c819f361fd..f85daec9d266 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1463,6 +1463,12 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 #define IS_ICL_WITH_PORT_F(dev_priv) \
 	IS_SUBPLATFORM(dev_priv, INTEL_ICELAKE, INTEL_SUBPLATFORM_PORTF)
 
+#define IS_TGL_U(dev_priv) \
+	IS_SUBPLATFORM(dev_priv, INTEL_TIGERLAKE, INTEL_SUBPLATFORM_ULT)
+
+#define IS_TGL_Y(dev_priv) \
+	IS_SUBPLATFORM(dev_priv, INTEL_TIGERLAKE, INTEL_SUBPLATFORM_ULX)
+
 #define SKL_REVID_A0		0x0
 #define SKL_REVID_B0		0x1
 #define SKL_REVID_C0		0x2
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 843cfb33fdba..f417d6933600 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -12226,4 +12226,10 @@ enum skl_power_gate {
 #define   DSB_ENABLE			(1 << 31)
 #define   DSB_STATUS			(1 << 0)
 
+#define TGL_ROOT_DEVICE_ID		0x9A00
+#define TGL_ROOT_DEVICE_MASK		0xFF00
+#define TGL_ROOT_DEVICE_SKU_MASK	0xF
+#define TGL_ROOT_DEVICE_SKU_ULX		0x2
+#define TGL_ROOT_DEVICE_SKU_ULT		0x4
+
 #endif /* _I915_REG_H_ */
diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
index 8a635bd4d5d8..2e25c671f74a 100644
--- a/drivers/gpu/drm/i915/intel_device_info.c
+++ b/drivers/gpu/drm/i915/intel_device_info.c
@@ -895,6 +895,25 @@ void intel_device_info_subplatform_init(struct drm_i915_private *i915)
 		mask = BIT(INTEL_SUBPLATFORM_PORTF);
 	}
 
+	if (IS_TIGERLAKE(i915)) {
+		struct pci_dev *root, *pdev = i915->drm.pdev;
+
+		root = list_first_entry(&pdev->bus->devices, typeof(*root), bus_list);
+
+		drm_WARN_ON(&i915->drm, mask);
+		drm_WARN_ON(&i915->drm, (root->device & TGL_ROOT_DEVICE_MASK) !=
+			    TGL_ROOT_DEVICE_ID);
+
+		switch (root->device & TGL_ROOT_DEVICE_SKU_MASK) {
+		case TGL_ROOT_DEVICE_SKU_ULX:
+			mask = BIT(INTEL_SUBPLATFORM_ULX);
+			break;
+		case TGL_ROOT_DEVICE_SKU_ULT:
+			mask = BIT(INTEL_SUBPLATFORM_ULT);
+			break;
+		}
+	}
+
 	GEM_BUG_ON(mask & ~INTEL_SUBPLATFORM_BITS);
 
 	RUNTIME_INFO(i915)->platform_mask[pi] |= mask;
-- 
2.29.2