[Intel-gfx] [PATCH] drm/i915/tgl: Simply subplatform detection

["José Roberto de Souza" <jose.souza@intel.com>]

In the past we had a need to differentiate TGL U and TGL Y, there
was a different voltage swing table for each subplatform and some PCI
ids of this subplatforms are shared but it turned out that it was a
specification mistake and the voltage swing table was indeed the same
but we went ahead with that patch because we needed to differentiate
TGL U and Y from TGL H and by that time TGL H was embargoed so that
was the perfect way to land it upstream.

Now the embargo for TGL H is long past and now we even have
INTEL_TGL_12_GT1_IDS with all TGL H ids, so we can drop this PCI root
check and only rely in the PCI ids to differentiate TGL U and Y from
TGL H that actually has code differences.

Besides the simplification this will fix issues in virtualization
environments where the PCI root is virtualized and don't have the same
id as actual hardware.

Cc: Fred Gao <fred.gao@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
---
 .../drm/i915/display/intel_ddi_buf_trans.c    |  2 +-
 drivers/gpu/drm/i915/i915_drv.h               |  9 +++------
 drivers/gpu/drm/i915/i915_reg.h               |  6 ------
 drivers/gpu/drm/i915/intel_device_info.c      | 20 +------------------
 drivers/gpu/drm/i915/intel_step.c             |  2 +-
 5 files changed, 6 insertions(+), 33 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.c b/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.c
index 0c32210bf5031..934a9f9e7dabb 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi_buf_trans.c
@@ -1321,7 +1321,7 @@ tgl_get_combo_buf_trans_dp(struct intel_encoder *encoder,
 	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 
 	if (crtc_state->port_clock > 270000) {
-		if (IS_TGL_U(dev_priv) || IS_TGL_Y(dev_priv)) {
+		if (IS_TGL_UY(dev_priv)) {
 			return intel_get_buf_trans(&tgl_uy_combo_phy_trans_dp_hbr2,
 						   n_entries);
 		} else {
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 1c2f4ae4ebf98..c5eb2a3a1a590 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1147,12 +1147,9 @@ 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) \
+#define IS_TGL_UY(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 IS_SKL_GRAPHICS_STEP(p, since, until) (IS_SKYLAKE(p) && IS_GRAPHICS_STEP(p, since, until))
 
 #define IS_KBL_GRAPHICS_STEP(dev_priv, since, until) \
@@ -1170,11 +1167,11 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 	 IS_DISPLAY_STEP(__i915, since, until))
 
 #define IS_TGL_UY_GRAPHICS_STEP(__i915, since, until) \
-	((IS_TGL_U(__i915) || IS_TGL_Y(__i915)) && \
+	(IS_TGL_UY(__i915) && \
 	 IS_GRAPHICS_STEP(__i915, since, until))
 
 #define IS_TGL_GRAPHICS_STEP(__i915, since, until) \
-	(IS_TIGERLAKE(__i915) && !(IS_TGL_U(__i915) || IS_TGL_Y(__i915)) && \
+	(IS_TIGERLAKE(__i915) && !IS_TGL_UY(__i915)) && \
 	 IS_GRAPHICS_STEP(__i915, since, until))
 
 #define IS_RKL_DISPLAY_STEP(p, since, until) \
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 2b8a3086ed35a..30aa1d99f2244 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8823,12 +8823,6 @@ 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
-
 #define CLKREQ_POLICY			_MMIO(0x101038)
 #define  CLKREQ_POLICY_MEM_UP_OVRD	REG_BIT(1)
 
diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
index ae13bc3c7970e..4329828b0db25 100644
--- a/drivers/gpu/drm/i915/intel_device_info.c
+++ b/drivers/gpu/drm/i915/intel_device_info.c
@@ -149,6 +149,7 @@ static const u16 subplatform_ult_ids[] = {
 	INTEL_WHL_U_GT3_IDS(0),
 	INTEL_CML_U_GT1_IDS(0),
 	INTEL_CML_U_GT2_IDS(0),
+	INTEL_TGL_12_GT2_IDS(0),
 };
 
 static const u16 subplatform_ulx_ids[] = {
@@ -243,25 +244,6 @@ void intel_device_info_subplatform_init(struct drm_i915_private *i915)
 		mask = BIT(INTEL_SUBPLATFORM_G12);
 	}
 
-	if (IS_TIGERLAKE(i915)) {
-		struct pci_dev *root, *pdev = to_pci_dev(i915->drm.dev);
-
-		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_MASK);
 
 	RUNTIME_INFO(i915)->platform_mask[pi] |= mask;
diff --git a/drivers/gpu/drm/i915/intel_step.c b/drivers/gpu/drm/i915/intel_step.c
index ac1a796b28084..4fd69ecd14811 100644
--- a/drivers/gpu/drm/i915/intel_step.c
+++ b/drivers/gpu/drm/i915/intel_step.c
@@ -165,7 +165,7 @@ void intel_step_init(struct drm_i915_private *i915)
 	} else if (IS_ROCKETLAKE(i915)) {
 		revids = rkl_revids;
 		size = ARRAY_SIZE(rkl_revids);
-	} else if (IS_TGL_U(i915) || IS_TGL_Y(i915)) {
+	} else if (IS_TGL_UY(i915)) {
 		revids = tgl_uy_revids;
 		size = ARRAY_SIZE(tgl_uy_revids);
 	} else if (IS_TIGERLAKE(i915)) {
-- 
2.35.1