[Intel-gfx] [PATCH] drm/i915: Add missing POSTING_READ()s to BXT dbuf enable sequence

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Do a POSTING_READ() between the DBUF_CTL register write and the
udelay() to make sure we really wait after the register write has
happened.

Spotted while reviewing Damien's SKL cdclk patch which had the
POSTING_READ()s.

Cc: Imre Deak <imre.deak at intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 8e21e23..5c2047b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5482,6 +5482,8 @@ void broxton_init_cdclk(struct drm_device *dev)
 	broxton_set_cdclk(dev, 624000);
 
 	I915_WRITE(DBUF_CTL, I915_READ(DBUF_CTL) | DBUF_POWER_REQUEST);
+	POSTING_READ(DBUF_CTL);
+
 	udelay(10);
 
 	if (!(I915_READ(DBUF_CTL) & DBUF_POWER_STATE))
@@ -5493,6 +5495,8 @@ void broxton_uninit_cdclk(struct drm_device *dev)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
 	I915_WRITE(DBUF_CTL, I915_READ(DBUF_CTL) & ~DBUF_POWER_REQUEST);
+	POSTING_READ(DBUF_CTL);
+
 	udelay(10);
 
 	if (I915_READ(DBUF_CTL) & DBUF_POWER_STATE)
-- 
2.0.5