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>

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 12d2fdc..e8a5ffb 100644 (file)
--- 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) {