Bspec requires a 10 us delay after disabling power well 1 and - if not
toggled on-demand - the AUX IO power wells during display uninit.
Signed-off-by: Imre Deak <imre.d...@intel.com>
---
drivers/gpu/drm/i915/intel_runtime_pm.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c
b/drivers/gpu/drm/i915/intel_runtime_pm.c
index efe80ed..fd59016 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -2701,6 +2701,8 @@ static void skl_display_core_uninit(struct
drm_i915_private *dev_priv)
intel_power_well_disable(dev_priv, well);
mutex_unlock(&power_domains->lock);
+
+ usleep_range(10, 30); /* 10 us delay per Bspec */
}
void bxt_display_core_init(struct drm_i915_private *dev_priv,
@@ -2758,6 +2760,8 @@ void bxt_display_core_uninit(struct drm_i915_private
*dev_priv)
intel_power_well_disable(dev_priv, well);
mutex_unlock(&power_domains->lock);
+
+ usleep_range(10, 30); /* 10 us delay per Bspec */
}
#define CNL_PROCMON_IDX(val) \
@@ -2859,6 +2863,8 @@ static void cnl_display_core_uninit(struct
drm_i915_private *dev_priv)
intel_power_well_disable(dev_priv, well);
mutex_unlock(&power_domains->lock);
+ usleep_range(10, 30); /* 10 us delay per Bspec */
+
/* 5. Disable Comp */
val = I915_READ(CHICKEN_MISC_2);
val |= COMP_PWR_DOWN;
--
2.7.4
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