[PATCH 01/23] drm/i915/gen9+: Add 10 us delay after power well 1/AUX IO pw disabling

[Imre Deak]

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.deak at 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