Copy&pasted from the vlv setup code. According to docs, we need that on ivb, too. Cc: Ben Widawsky <ben at bwidawsk.net> Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch> --- drivers/gpu/drm/i915/intel_display.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 33aaad3..7be1d1a 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -8938,6 +8938,11 @@ static void ivybridge_init_clock_gating(struct drm_device *dev) DISPPLANE_TRICKLE_FEED_DISABLE); intel_flush_display_plane(dev_priv, pipe); } + + /* WaDisable4x2SubspanOptimization */ + I915_WRITE(CACHE_MODE_1, I915_READ(CACHE_MODE_1) | + (PIXEL_SUBSPAN_COLLECT_OPT_DISABLE << 16) | + PIXEL_SUBSPAN_COLLECT_OPT_DISABLE); } static void valleyview_init_clock_gating(struct drm_device *dev) -- 1.7.10
