[Intel-gfx] [PATCH 3/3] drm/i915/edp: Fix warning as vdd went down without driver knowledge

[Animesh Manna]

Kernel warning triggered as vdd went down after certain time during
aux transfer in connector init sequence. To solve the kernel
warning adjust power domain and vdd wakeref count.
Currently issue seen on ADL so add the above adjustment part of
ADL platform check, if needed will extend for future platform.

Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Uma Shankar <uma.shankar at intel.com>
Signed-off-by: Animesh Manna <animesh.manna at intel.com>
---
 drivers/gpu/drm/i915/display/intel_pps.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_pps.c b/drivers/gpu/drm/i915/display/intel_pps.c
index 0975e49f8d03..1857bbcc6fd4 100644
--- a/drivers/gpu/drm/i915/display/intel_pps.c
+++ b/drivers/gpu/drm/i915/display/intel_pps.c
@@ -587,8 +587,15 @@ bool intel_pps_vdd_on_unlocked(struct intel_dp *intel_dp)
 	cancel_delayed_work(&intel_dp->pps.panel_vdd_work);
 	intel_dp->pps.want_panel_vdd = true;
 
-	if (edp_have_panel_vdd(intel_dp))
+	if (edp_have_panel_vdd(intel_dp)) {
 		return need_to_disable;
+	} else {
+		if ((IS_ALDERLAKE_S(dev_priv) || IS_ALDERLAKE_P(dev_priv)) &&
+		    intel_dp->pps.vdd_wakeref)
+			intel_display_power_put(dev_priv,
+						intel_aux_power_domain(dig_port),
+						fetch_and_zero(&intel_dp->pps.vdd_wakeref));
+	}
 
 	drm_WARN_ON(&dev_priv->drm, intel_dp->pps.vdd_wakeref);
 	intel_dp->pps.vdd_wakeref = intel_display_power_get(dev_priv,
-- 
2.29.0