diff mbox

drm/i915: Configure dither for eDP

Message ID 1275381345-18900-1-git-send-email-zhenyuw@linux.intel.com (mailing list archive)
State Deferred, archived
Headers show

Commit Message

Zhenyu Wang June 1, 2010, 8:35 a.m. UTC 
None
diff mbox

Patch

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 7ffd51c..c757019 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3627,6 +3627,18 @@  static int intel_crtc_mode_set(struct drm_crtc *crtc,
 	/* setup pipeconf */
 	pipeconf = I915_READ(pipeconf_reg);
 
+	/* configure the dither for eDP */
+	if (HAS_PCH_SPLIT(dev) &&
+	    (is_edp || (is_dp && intel_pch_has_edp(crtc)))) {
+		pipeconf &= ~PIPE_DITHER_TYPE_MASK;
+		if ((pipeconf & PIPE_BPC_MASK) != PIPE_8BPC) {
+			pipeconf |= PIPE_ENABLE_DITHER;
+			pipeconf |= PIPE_DITHER_TYPE_ST01;
+		} else {
+			pipeconf &= ~PIPE_ENABLE_DITHER;
+		}
+	}
+
 	/* Set up the display plane register */
 	dspcntr = DISPPLANE_GAMMA_ENABLE;