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)) {
