linux-kernel - [012/152] drm/i915: Always set the DP transcoder config to 8BPC.

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Date:	Wed, 05 Jan 2011 16:21:51 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Eric Anholt <eric@...olt.net>,
	Chris Wilson <chris@...is-wilson.co.uk>
Subject: [012/152] drm/i915: Always set the DP transcoder config to 8BPC.

2.6.36-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Eric Anholt <eric@...olt.net>

commit 220cad3cbf553f893432919b458da36489373fc6 upstream.

The pipe is always set to 8BPC, but here we were leaving whatever
previous bits were set by the BIOS in place.

Signed-off-by: Eric Anholt <eric@...olt.net>
Tested-by: Keith Packard <keithp@...thp.com>
Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/i915/i915_reg.h      |    1 +
 drivers/gpu/drm/i915/intel_display.c |    4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2953,6 +2953,7 @@
 #define  TRANS_DP_10BPC		(1<<9)
 #define  TRANS_DP_6BPC		(2<<9)
 #define  TRANS_DP_12BPC		(3<<9)
+#define  TRANS_DP_BPC_MASK	(3<<9)
 #define  TRANS_DP_VSYNC_ACTIVE_HIGH	(1<<4)
 #define  TRANS_DP_VSYNC_ACTIVE_LOW	0
 #define  TRANS_DP_HSYNC_ACTIVE_HIGH	(1<<3)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2044,9 +2044,11 @@ static void ironlake_crtc_dpms(struct dr
 
 				reg = I915_READ(trans_dp_ctl);
 				reg &= ~(TRANS_DP_PORT_SEL_MASK |
-					 TRANS_DP_SYNC_MASK);
+					 TRANS_DP_SYNC_MASK |
+					 TRANS_DP_BPC_MASK);
 				reg |= (TRANS_DP_OUTPUT_ENABLE |
 					TRANS_DP_ENH_FRAMING);
+				reg |= TRANS_DP_8BPC;
 
 				if (crtc->mode.flags & DRM_MODE_FLAG_PHSYNC)
 				      reg |= TRANS_DP_HSYNC_ACTIVE_HIGH;


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