drm/radeon/kms: use correct reg on fusion when reading back mem config

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 12d2fdc52414..e8a5ffb0124d 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -2248,7 +2248,10 @@ int evergreen_mc_init(struct radeon_device *rdev)
 
         /* Get VRAM informations */
         rdev->mc.vram_is_ddr = true;
-        tmp = RREG32(MC_ARB_RAMCFG);
+        if (rdev->flags & RADEON_IS_IGP)
+                tmp = RREG32(FUS_MC_ARB_RAMCFG);
+        else
+                tmp = RREG32(MC_ARB_RAMCFG);
         if (tmp & CHANSIZE_OVERRIDE) {
                 chansize = 16;
         } else if (tmp & CHANSIZE_MASK) {