From 8e09bf837f8c6b09784bf22c3a8c597df3c20b79 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 8 Jul 2014 10:40:30 +0100 Subject: [PATCH] drm/i915: Use mmio flips to change tiling mode on Baytrail 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 Signed-off-by: Daniel Vetter --- 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 8728c88..8e738d4 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -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) { -- 2.7.4