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drm/i915: POSTING_READ IPS_CTL before waiting for the vblank

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Make sure we write to IPS before we actually wait.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Paulo Zanoni 2013-09-19 17:03:05 -03:00 committed by Daniel Vetter
parent 6ceeeec045
commit 81c12f6e78
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/i915/intel_display.c
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@ -3386,6 +3386,7 @@ static void hsw_disable_ips(struct intel_crtc *crtc)
assert_plane_enabled(dev_priv, crtc->plane);
I915_WRITE(IPS_CTL, 0);
POSTING_READ(IPS_CTL);
/* We need to wait for a vblank before we can disable the plane. */
intel_wait_for_vblank(dev, crtc->pipe);