drm/radeon/kms: don't default display priority to high on rs4xx

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@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index da85cad1152b..1006549d1570 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -983,8 +983,11 @@ void radeon_update_display_priority(struct radeon_device *rdev)
                 /* 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;