[Intel-gfx] [PATCH v4] 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.

---v2
-change style on how we mention WA [Ankit]
-fix bat error by creating new func that is only called for aux power
well scenarios so we can avoid null pointer error as it is called
everywhere.

--v3
-Add non-default enable_timeout to power well descriptor which avoids
adding more platform checks [Imre]

--v4
-Remove Bspec link from top to bottom remove WA link from commit put it
on comment [Jani]
-enable_timeout in ms and add .fixed_enable_delay too [Imre]

Bspec: 55480

Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Imre Deak <imre.deak at intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
---
 .../gpu/drm/i915/display/intel_display_power_map.c    | 11 +++++++++++
 .../gpu/drm/i915/display/intel_display_power_well.c   |  3 ++-
 .../gpu/drm/i915/display/intel_display_power_well.h   |  2 ++
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_power_map.c b/drivers/gpu/drm/i915/display/intel_display_power_map.c
index 6645eb1911d8..f0d51a30430a 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power_map.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power_map.c
@@ -1385,6 +1385,17 @@ static const struct i915_power_well_desc xelpd_power_wells_main[] = {
 		),
 		.ops = &icl_aux_power_well_ops,
 		.fixed_enable_delay = true,
+	}, {
+		.instances = &I915_PW_INSTANCES(
+			I915_PW("AUX_USBC1", &tgl_pwdoms_aux_usbc1, .hsw.idx = TGL_PW_CTL_IDX_AUX_TC1),
+			I915_PW("AUX_USBC2", &tgl_pwdoms_aux_usbc2, .hsw.idx = TGL_PW_CTL_IDX_AUX_TC2),
+			I915_PW("AUX_USBC3", &tgl_pwdoms_aux_usbc3, .hsw.idx = TGL_PW_CTL_IDX_AUX_TC3),
+			I915_PW("AUX_USBC4", &tgl_pwdoms_aux_usbc4, .hsw.idx = TGL_PW_CTL_IDX_AUX_TC4),
+		),
+		.ops = &icl_aux_power_well_ops,
+		.fixed_enable_delay = true,
+		/* WA_14017248603: adlp */
+		.enable_timeout = 500,
 	}, {
 		.instances = &I915_PW_INSTANCES(
 			I915_PW("AUX_TBT1", &icl_pwdoms_aux_tbt1, .hsw.idx = TGL_PW_CTL_IDX_AUX_TBT1),
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..930a42c825c3 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power_well.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power_well.c
@@ -253,6 +253,7 @@ static void hsw_wait_for_power_well_enable(struct drm_i915_private *dev_priv,
 {
 	const struct i915_power_well_regs *regs = power_well->desc->ops->regs;
 	int pw_idx = i915_power_well_instance(power_well)->hsw.idx;
+	int timeout = power_well->desc->enable_timeout ? : 1;
 
 	/*
 	 * For some power wells we're not supposed to watch the status bit for
@@ -266,7 +267,7 @@ static void hsw_wait_for_power_well_enable(struct drm_i915_private *dev_priv,
 
 	/* Timeout for PW1:10 us, AUX:not specified, other PWs:20 us. */
 	if (intel_de_wait_for_set(dev_priv, regs->driver,
-				  HSW_PWR_WELL_CTL_STATE(pw_idx), 1)) {
+				  HSW_PWR_WELL_CTL_STATE(pw_idx), timeout)) {
 		drm_dbg_kms(&dev_priv->drm, "%s power well enable timeout\n",
 			    intel_power_well_name(power_well));
 
diff --git a/drivers/gpu/drm/i915/display/intel_display_power_well.h b/drivers/gpu/drm/i915/display/intel_display_power_well.h
index ba7cb977e7c7..e494df379e6c 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power_well.h
+++ b/drivers/gpu/drm/i915/display/intel_display_power_well.h
@@ -110,6 +110,8 @@ struct i915_power_well_desc {
 	 * Thunderbolt mode.
 	 */
 	u16 is_tc_tbt:1;
+	/* Enable timeout if greater than the default 1ms */
+	u16 enable_timeout;
 };
 
 struct i915_power_well {
-- 
2.25.1