From 81c12f6e78c535533e9258bd9476b5d7419d3cce Mon Sep 17 00:00:00 2001 From: Paulo Zanoni Date: Thu, 19 Sep 2013 17:03:05 -0300 Subject: [PATCH] drm/i915: POSTING_READ IPS_CTL before waiting for the vblank Make sure we write to IPS before we actually wait. Signed-off-by: Paulo Zanoni Reviewed-by: Chris Wilson Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_display.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 2ed974e1d08b..1a4232e446fe 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -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);