2 files changed, 10 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 527d30aecda2..0bbbb7753950 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1922,7 +1922,10 @@
 /* Display & cursor control */
 
 /* dithering flag on Ironlake */
-#define PIPE_ENABLE_DITHER      (1 << 4)
+#define PIPE_ENABLE_DITHER              (1 << 4)
+#define PIPE_DITHER_TYPE_MASK           (3 << 2)
+#define PIPE_DITHER_TYPE_SPATIAL        (0 << 2)
+#define PIPE_DITHER_TYPE_ST01           (1 << 2)
 /* Pipe A */
 #define PIPEADSL                0x70000
 #define PIPEACONF               0x70008
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 3836f56e842c..119a41ac3bb6 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3677,14 +3677,16 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
                 /* set the dithering flag */
                 if (IS_I965G(dev)) {
                         if (dev_priv->lvds_dither) {
-                                if (HAS_PCH_SPLIT(dev))
+                                if (HAS_PCH_SPLIT(dev)) {
                                         pipeconf |= PIPE_ENABLE_DITHER;
-                                else
+                                        pipeconf |= PIPE_DITHER_TYPE_ST01;
+                                } else
                                         lvds |= LVDS_ENABLE_DITHER;
                         } else {
-                                if (HAS_PCH_SPLIT(dev))
+                                if (HAS_PCH_SPLIT(dev)) {
                                         pipeconf &= ~PIPE_ENABLE_DITHER;
-                                else
+                                        pipeconf &= ~PIPE_DITHER_TYPE_MASK;
+                                } else
                                         lvds &= ~LVDS_ENABLE_DITHER;
                         }
                 }