[Bug 76176] [BYT] Page flip doesn't change tiling mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76176

--- Comment #9 from Chris Wilson <chris at chris-wilson.co.uk> ---
diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index 97432d2..e3fba41 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9763,6 +9763,10 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,

        if (IS_VALLEYVIEW(dev)) {
                ring = &dev_priv->ring[BCS];
+               if (obj->tiling_mode !=
to_intel_framebuffer(old_fb)->obj->tiling_mode)
+                       ring = NULL;
+       } else if (IS_IVYBRIDGE(dev)) {
+               ring = &dev_priv->ring[BCS];
        } else if (INTEL_INFO(dev)->gen >= 7) {

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