[PATCH 03/12] drm/i915/cx0: Extend C10 check to PTL

[Matt Atwood <matthew.s.atwood@intel.com>]

From: Dnyaneshwar Bhadane <dnyaneshwar.bhadane@intel.com>

When deciding the type of the phy, Add PTL support to make
sure the correct path is taken for selection of C10 PHY.
Only port A is connected C10 PHY for Pantherlake.

Bspec:  72571
Signed-off-by: Dnyaneshwar Bhadane <dnyaneshwar.bhadane@intel.com>
Signed-off-by: Matt Atwood <matthew.s.atwood@intel.com>
---
 drivers/gpu/drm/i915/display/intel_cx0_phy.c      | 9 +++++++--
 drivers/gpu/drm/xe/compat-i915-headers/i915_drv.h | 1 +
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
index 13a99f494680..73a151c81706 100644
--- a/drivers/gpu/drm/i915/display/intel_cx0_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
@@ -34,6 +34,9 @@ bool intel_encoder_is_c10phy(struct intel_encoder *encoder)
 	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
 	enum phy phy = intel_encoder_to_phy(encoder);
 
+	if (IS_PANTHERLAKE(i915) && phy == PHY_A)
+		return true;
+
 	if ((IS_LUNARLAKE(i915) || IS_METEORLAKE(i915)) && phy < PHY_C)
 		return true;
 
@@ -221,7 +224,8 @@ static int __intel_cx0_read_once(struct intel_encoder *encoder,
 	 * down and let the message bus to end up
 	 * in a known state
 	 */
-	intel_cx0_bus_reset(encoder, lane);
+	if (DISPLAY_VER(i915) < 30)
+		intel_cx0_bus_reset(encoder, lane);
 
 	return REG_FIELD_GET(XELPDP_PORT_P2M_DATA_MASK, val);
 }
@@ -310,7 +314,8 @@ static int __intel_cx0_write_once(struct intel_encoder *encoder,
 	 * down and let the message bus to end up
 	 * in a known state
 	 */
-	intel_cx0_bus_reset(encoder, lane);
+	if (DISPLAY_VER(i915) < 30)
+		intel_cx0_bus_reset(encoder, lane);
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/xe/compat-i915-headers/i915_drv.h b/drivers/gpu/drm/xe/compat-i915-headers/i915_drv.h
index b7041b578e5e..bd8c3de57dcd 100644
--- a/drivers/gpu/drm/xe/compat-i915-headers/i915_drv.h
+++ b/drivers/gpu/drm/xe/compat-i915-headers/i915_drv.h
@@ -67,6 +67,7 @@ static inline struct drm_i915_private *to_i915(const struct drm_device *dev)
 #define IS_METEORLAKE(dev_priv) IS_PLATFORM(dev_priv, XE_METEORLAKE)
 #define IS_LUNARLAKE(dev_priv) IS_PLATFORM(dev_priv, XE_LUNARLAKE)
 #define IS_BATTLEMAGE(dev_priv)  IS_PLATFORM(dev_priv, XE_BATTLEMAGE)
+#define IS_PANTHERLAKE(dev_priv) IS_PLATFORM(dev_priv, XE_PANTHERLAKE)
 
 #define IS_HASWELL_ULT(dev_priv) (dev_priv && 0)
 #define IS_BROADWELL_ULT(dev_priv) (dev_priv && 0)
-- 
2.45.0