[Intel-gfx] [PATCH 02/10] drm/i915: don't set transcoder bpc on CougarPoint

[Jesse Barnes]

This prevents us from setting reserved or incorrect bits on CougarPoint.

Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
---
 drivers/gpu/drm/i915/intel_display.c |   15 +++++++++------
 1 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 86a3ec1..cd8d833 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1157,12 +1157,15 @@ static void intel_enable_transcoder(struct drm_i915_private *dev_priv,
 
 	reg = TRANSCONF(pipe);
 	val = I915_READ(reg);
-	/*
-	 * make the BPC in transcoder be consistent with
-	 * that in pipeconf reg.
-	 */
-	val &= ~PIPE_BPC_MASK;
-	val |= I915_READ(PIPECONF(pipe)) & PIPE_BPC_MASK;
+
+	if (HAS_PCH_IBX(dev_priv->dev)) {
+		/*
+		 * make the BPC in transcoder be consistent with
+		 * that in pipeconf reg.
+		 */
+		val &= ~PIPE_BPC_MASK;
+		val |= I915_READ(PIPECONF(pipe)) & PIPE_BPC_MASK;
+	}
 	I915_WRITE(reg, val | TRANS_ENABLE);
 	if (wait_for(I915_READ(reg) & TRANS_STATE_ENABLE, 100))
 		DRM_ERROR("failed to enable transcoder %d\n", pipe);
-- 
1.7.4.1