drm/i915/dg1: Update comp master/slave relationships for PHYs

As with RKL, DG1's PHY C acts as a comp master for PHY D.

Bspec: 49291
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201007002210.3678024-7-lucas.demarchi@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_combo_phy.c b/drivers/gpu/drm/i915/display/intel_combo_phy.c
index 07c9fa2..932265f 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_combo_phy.c
+++ b/drivers/gpu/drm/i915/display/intel_combo_phy.c
@@ -243,14 +243,14 @@ static bool phy_is_master(struct drm_i915_private *dev_priv, enum phy phy)
         *
         * ICL,TGL:
         *   A(master) -> B(slave), C(slave)
-        * RKL:
+        * RKL,DG1:
         *   A(master) -> B(slave)
         *   C(master) -> D(slave)
         *
         * We must set the IREFGEN bit for any PHY acting as a master
         * to another PHY.
         */
-       if (IS_ROCKETLAKE(dev_priv) && phy == PHY_C)
+       if ((IS_DG1(dev_priv) || IS_ROCKETLAKE(dev_priv)) && phy == PHY_C)
                return true;
 
        return phy == PHY_A;