[PATCH] drm/radeon: fix resume on some rs4xx boards

[Alex Deucher]

Setting MC_MISC_CNTL.GART_INDEX_REG_EN causes hangs on
some boards on resume.  The systems seem to work fine
without touching this bit so leave it as is.

Reported-by: Ondrej Zary <linux at rainbow-software.org>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Cc: stable at vger.kernel.org
---
 drivers/gpu/drm/radeon/rs400.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/rs400.c b/drivers/gpu/drm/radeon/rs400.c
index 233a9b9..d48fdacd 100644
--- a/drivers/gpu/drm/radeon/rs400.c
+++ b/drivers/gpu/drm/radeon/rs400.c
@@ -177,7 +177,8 @@ int rs400_gart_enable(struct radeon_device *rdev)
 		WREG32_MC(RS480_MC_MISC_CNTL,
 			  (RS480_GART_INDEX_REG_EN | RS690_BLOCK_GFX_D3_EN));
 	} else {
-		WREG32_MC(RS480_MC_MISC_CNTL, RS480_GART_INDEX_REG_EN);
+		/* XXX this causes hangs on a some boards on resume */
+		/*WREG32_MC(RS480_MC_MISC_CNTL, RS480_GART_INDEX_REG_EN);*/
 	}
 	/* Enable gart */
 	WREG32_MC(RS480_AGP_ADDRESS_SPACE_SIZE, (RS480_GART_EN | size_reg));
-- 
1.8.3.1