[Intel-gfx] [PATCH v2] drm/i915/display: Increase AUX timeout for Type-C

[Suraj Kandpal]

Type-C PHYs are taking longer than expected for Aux IO Power Enabling.
Workaround: Increase the timeout.

WA_14017248603: adlp
Bspec: 55480

---v2
-change style on how we mention WA [Ankit]
-fix bat error

Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
---
 .../i915/display/intel_display_power_well.c   | 30 ++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_power_well.c b/drivers/gpu/drm/i915/display/intel_display_power_well.c
index 62bafcbc7937..52f595929a18 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power_well.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power_well.c
@@ -489,6 +489,34 @@ static void icl_tc_cold_exit(struct drm_i915_private *i915)
 		    "succeeded");
 }
 
+static void
+adl_aux_wait_for_power_well_enable(struct drm_i915_private *i915,
+				   struct i915_power_well *power_well,
+				   bool timeout_expected)
+{
+	const struct i915_power_well_regs *regs = power_well->desc->ops->regs;
+	enum phy phy = icl_aux_pw_to_phy(i915, power_well);
+	int pw_idx = i915_power_well_instance(power_well)->hsw.idx;
+
+	/*
+	 * WA_14017248603: adlp
+	 * Type-C Phy are taking longer than expected for AUX IO Power Enabling.
+	 * Increase timeout to 500ms.
+	 */
+	if (IS_ALDERLAKE_P(i915) && intel_phy_is_tc(i915, phy)) {
+		if (intel_de_wait_for_set(i915, regs->driver,
+					  HSW_PWR_WELL_CTL_STATE(pw_idx), 500)) {
+			drm_dbg_kms(&i915->drm, "%s power well enable timeout\n",
+				    intel_power_well_name(power_well));
+
+			drm_WARN_ON(&i915->drm, !timeout_expected);
+		}
+		return;
+	}
+
+	hsw_wait_for_power_well_enable(i915, power_well, timeout_expected);
+}
+
 static void
 icl_tc_phy_aux_power_well_enable(struct drm_i915_private *dev_priv,
 				 struct i915_power_well *power_well)
@@ -517,7 +545,7 @@ icl_tc_phy_aux_power_well_enable(struct drm_i915_private *dev_priv,
 	if (DISPLAY_VER(dev_priv) == 11 && intel_tc_cold_requires_aux_pw(dig_port))
 		icl_tc_cold_exit(dev_priv);
 
-	hsw_wait_for_power_well_enable(dev_priv, power_well, timeout_expected);
+	adl_aux_wait_for_power_well_enable(dev_priv, power_well, timeout_expected);
 
 	if (DISPLAY_VER(dev_priv) >= 12 && !is_tbt) {
 		enum tc_port tc_port;
-- 
2.25.1