[Intel-gfx] [PATCH 13/21] drm/i915/adl_s: Update combo PHY master/slave relationships

[Aditya Swarup]

From: Matt Roper <matthew.d.roper at intel.com>

ADL-S switches up which PHYs are considered a master to other PHYs;
PHY-C is no longer a master, but PHY-D is now.

Bspec: 49291
Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Imre Deak <imre.deak at intel.com>
Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
Signed-off-by: Aditya Swarup <aditya.swarup at intel.com>
---
 drivers/gpu/drm/i915/display/intel_combo_phy.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_combo_phy.c b/drivers/gpu/drm/i915/display/intel_combo_phy.c
index d5ad61e4083e..55d2d2d9efbb 100644
--- a/drivers/gpu/drm/i915/display/intel_combo_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_combo_phy.c
@@ -246,14 +246,21 @@ static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy)
 	 * RKL,DG1:
 	 *   A(master) -> B(slave)
 	 *   C(master) -> D(slave)
+	 * ADL-S:
+	 *   A(master) -> B(slave), C(slave)
+	 *   D(master) -> E(slave)
 	 *
 	 * We must set the IREFGEN bit for any PHY acting as a master
 	 * to another PHY.
 	 */
-	if ((IS_DG1(dev_priv) || IS_ROCKETLAKE(dev_priv)) && phy == PHY_C)
+	if (phy == PHY_A)
 		return true;
+	else if (IS_ALDERLAKE_S(dev_priv))
+		return phy == PHY_D;
+	else if (IS_DG1(dev_priv) || IS_ROCKETLAKE(dev_priv))
+		return phy == PHY_C;
 
-	return phy == PHY_A;
+	return false;
 }
 
 static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
-- 
2.27.0