Merge branch 'usb-target-merge' of git://git.kernel.org/pub/scm/linux/kernel/git...

[firefly-linux-kernel-4.4.55.git] / drivers / gpu / drm / i915 / intel_ringbuffer.c

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index f75806e5bff5c62273ddaee7d5f94bd15cb860e8..62892a826edec6df73de3d2b49edfc893d6e01a5 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -398,6 +398,17 @@ static int init_render_ring(struct intel_ring_buffer *ring)
                        return ret;
        }
 
+
+       if (IS_GEN6(dev)) {
+               /* From the Sandybridge PRM, volume 1 part 3, page 24:
+                * "If this bit is set, STCunit will have LRA as replacement
+                *  policy. [...] This bit must be reset.  LRA replacement
+                *  policy is not supported."
+                */
+               I915_WRITE(CACHE_MODE_0,
+                          CM0_STC_EVICT_DISABLE_LRA_SNB << CM0_MASK_SHIFT);
+       }
+
        if (INTEL_INFO(dev)->gen >= 6) {
                I915_WRITE(INSTPM,
                           INSTPM_FORCE_ORDERING << 16 | INSTPM_FORCE_ORDERING);