[Intel-gfx] [PATCH] drm/i915/icl: Ensure port A combo PHY HW state is correct

[Imre Deak]

Make sure the HW state of the port A combo PHY is correct wrt. the
IREFGEN setting. This will force a reprogramming during init or a WARN
during uninit if the setting is incorrect.

On my ICL RVP I haven't seen this check failing and leading to a forced
reinit/WARN, but let's add it still for consistency.

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/intel_combo_phy.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_combo_phy.c b/drivers/gpu/drm/i915/intel_combo_phy.c
index 98213cc58736..841708da5a56 100644
--- a/drivers/gpu/drm/i915/intel_combo_phy.c
+++ b/drivers/gpu/drm/i915/intel_combo_phy.c
@@ -198,6 +198,10 @@ static bool icl_combo_phy_verify_state(struct drm_i915_private *dev_priv,
 
 	ret = cnl_verify_procmon_ref_values(dev_priv, port);
 
+	if (port == PORT_A)
+		ret &= check_phy_reg(dev_priv, port, ICL_PORT_COMP_DW8(port),
+				     IREFGEN, IREFGEN);
+
 	ret &= check_phy_reg(dev_priv, port, ICL_PORT_CL_DW5(port),
 			     CL_POWER_DOWN_ENABLE, CL_POWER_DOWN_ENABLE);
 
-- 
2.17.1