[ 48/82] drm/radeon: fix HD6790, HD6570 backend programming

[Ben Hutchings]

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

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

From: Jerome Glisse <jglisse@xxxxxxxxxx>

commit 95c4b23ec4e2fa5604df229ddf134e31d7b3b378 upstream.

Without this bit sets we get broken rendering and
lockups.

fglrx sets this bit.

Bugs that should be fixed by this patch :
https://bugs.freedesktop.org/show_bug.cgi?id=49792
https://bugzilla.kernel.org/show_bug.cgi?id=43207
https://bugs.freedesktop.org/show_bug.cgi?id=39282

Signed-off-by: Jerome Glisse <jglisse@xxxxxxxxxx>
Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/radeon/evergreen.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 0408ac2..6a57f0d 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -2178,9 +2178,9 @@ static void evergreen_gpu_init(struct radeon_device *rdev)
 		WREG32(CC_SYS_RB_BACKEND_DISABLE, rb);
 		WREG32(GC_USER_RB_BACKEND_DISABLE, rb);
 		WREG32(CC_GC_SHADER_PIPE_CONFIG, sp);
-        }
+	}
 
-	grbm_gfx_index |= SE_BROADCAST_WRITES;
+	grbm_gfx_index = INSTANCE_BROADCAST_WRITES | SE_BROADCAST_WRITES;
 	WREG32(GRBM_GFX_INDEX, grbm_gfx_index);
 	WREG32(RLC_GFX_INDEX, grbm_gfx_index);
 


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