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drm/i915: Use mmio flips to change tiling mode on Baytrail

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For whatever reason, MI_DISPLAY_FLIP fails to change tiling mode on
Baytrail, so just use CPU driven mmio flips instead.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=76176
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2014-07-08 10:40:30 +01:00 committed by Daniel Vetter
parent 2a92d5bca1
commit 8e09bf837f
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/i915/intel_display.c
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@ -9435,6 +9435,9 @@ static bool use_mmio_flip(struct intel_engine_cs *ring,
* So using MMIO flips there would disrupt this mechanism.
*/
if (ring == NULL)
return true;
if (INTEL_INFO(ring->dev)->gen < 5)
return false;
@ -9658,6 +9661,9 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
if (IS_VALLEYVIEW(dev)) {
ring = &dev_priv->ring[BCS];
if (obj->tiling_mode != work->old_fb_obj->tiling_mode)
/* vlv: DISPLAY_FLIP fails to change tiling */
ring = NULL;
} else if (IS_IVYBRIDGE(dev)) {
ring = &dev_priv->ring[BCS];
} else if (INTEL_INFO(dev)->gen >= 7) {