[3.13.y.z extended stable] Patch "drm/i915: Don't clobber CHICKEN_PIPESL_1 on BDW" has been added to staging queue

Kamal Mostafa kamal at canonical.com
Thu May 1 19:17:08 UTC 2014

This is a note to let you know that I have just added a patch titled

    drm/i915: Don't clobber CHICKEN_PIPESL_1 on BDW

to the linux-3.13.y-queue branch of the 3.13.y.z extended stable tree 
which can be found at:


This patch is scheduled to be released in version

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y.z tree, see



>From da82cd52e5e8da64934d205188b6053c05e53984 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala at linux.intel.com>
Date: Wed, 5 Mar 2014 13:05:45 +0200
Subject: drm/i915: Don't clobber CHICKEN_PIPESL_1 on BDW
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

commit c7c656226842679bcd9f39dc24441b4ff398a850 upstream.

Misplaced parens cause us to totally clobber the CHICKEN_PIPESL_1
registers with 0xffffffff. Move the parens to the correct place
to avoid this.

In particular this caused bit 30 of said registers to be set, which
caused the sprite CSC to produce incorrect results.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=72220
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau at intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
[ kamal: backport to 3.13 (context) ]
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
 drivers/gpu/drm/i915/intel_pm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 26c29c1..e2d10ce 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5314,8 +5314,8 @@ static void gen8_init_clock_gating(struct drm_device *dev)
 	/* WaPsrDPRSUnmaskVBlankInSRD */
 	for_each_pipe(i) {
-			   I915_READ(CHICKEN_PIPESL_1(i) |
+			   I915_READ(CHICKEN_PIPESL_1(i)) |


More information about the kernel-team mailing list