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drm/i915: Add missing POSTING_READ()s to BXT dbuf enable sequence 

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@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2015-05-06 14:28:57 +03:00 committed by Daniel Vetter
parent 813b5e6971
commit 22e02c0b4b
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/intel_display.c
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@ -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)