[Intel-gfx] [PATCH 2/2] drm/i915: Use mmio flips to change tiling mode on Baytrail

[Chris Wilson]

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 at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_display.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 103d8f450e74..8a9695697380 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9453,6 +9453,9 @@ 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;
 
@@ -9747,6 +9750,9 @@ 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) {
-- 
2.0.1