linux-kernel - [072/200] drm/radeon/kms: dont default display priority to high on rs4xx

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Message-Id: <20100701174252.489489518@clark.site>
Date:	Thu, 01 Jul 2010 10:42:42 -0700
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,
	Alex Deucher <alexdeucher@...il.com>,
	Dave Airlie <airlied@...hat.com>
Subject: [072/200] drm/radeon/kms: dont default display priority to high on rs4xx

2.6.34-stable review patch.  If anyone has any objections, please let me know.

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

From: Alex Deucher <alexdeucher@...il.com>

commit 45737447ed160faaba036c0709226bf9057f7b72 upstream.

Seems to cause issues with the sound hardware.  Fixes kernel
bug 15982:
https://bugzilla.kernel.org/show_bug.cgi?id=15982

Signed-off-by: Alex Deucher <alexdeucher@...il.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/radeon/radeon_display.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -978,8 +978,11 @@ void radeon_update_display_priority(stru
 		/* set display priority to high for r3xx, rv515 chips
 		 * this avoids flickering due to underflow to the
 		 * display controllers during heavy acceleration.
+		 * Don't force high on rs4xx igp chips as it seems to
+		 * affect the sound card.  See kernel bug 15982.
 		 */
-		if (ASIC_IS_R300(rdev) || (rdev->family == CHIP_RV515))
+		if ((ASIC_IS_R300(rdev) || (rdev->family == CHIP_RV515)) &&
+		    !(rdev->flags & RADEON_IS_IGP))
 			rdev->disp_priority = 2;
 		else
 			rdev->disp_priority = 0;


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