3 files changed, 11 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index b4bb1ef77ddc..9d24d65f0c3e 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -568,6 +568,7 @@
 #define   CM0_MASK_SHIFT          16
 #define   CM0_IZ_OPT_DISABLE      (1<<6)
 #define   CM0_ZR_OPT_DISABLE      (1<<5)
+#define   CM0_STC_EVICT_DISABLE_LRA_SNB (1<<5)
 #define   CM0_DEPTH_EVICT_DISABLE (1<<4)
 #define   CM0_COLOR_EVICT_DISABLE (1<<3)
 #define   CM0_DEPTH_WRITE_DISABLE (1<<1)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index f75806e5bff5..80fce51e2f43 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -401,6 +401,14 @@ static int init_render_ring(struct intel_ring_buffer *ring)
         if (INTEL_INFO(dev)->gen >= 6) {
                 I915_WRITE(INSTPM,
                            INSTPM_FORCE_ORDERING << 16 | INSTPM_FORCE_ORDERING);
+
+                /* 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);
         }
 
         return ret;
diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index c5c31e091a92..af1054f8202a 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -958,8 +958,8 @@ static void atombios_crtc_set_pll(struct drm_crtc *crtc, struct drm_display_mode
                 break;
         }
 
-        if (radeon_encoder->active_device &
-            (ATOM_DEVICE_LCD_SUPPORT | ATOM_DEVICE_DFP_SUPPORT)) {
+        if ((radeon_encoder->active_device & (ATOM_DEVICE_LCD_SUPPORT | ATOM_DEVICE_DFP_SUPPORT)) ||
+            (radeon_encoder_get_dp_bridge_encoder_id(encoder) != ENCODER_OBJECT_ID_NONE)) {
                 struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
                 struct drm_connector *connector =
                         radeon_get_connector_for_encoder(encoder);