drm/radeon/kms: fix tiling reg on fusion

The location of MC_ARB_RAMCFG changed on fusion.
I've diffed all the other regs in evergreend.h and this
is the only other reg that changed.

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

2 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index c20eac3379e6..9073e3bfb08c 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -1780,7 +1780,10 @@ static void evergreen_gpu_init(struct radeon_device *rdev)
 
 
         mc_shared_chmap = RREG32(MC_SHARED_CHMAP);
-        mc_arb_ramcfg = RREG32(MC_ARB_RAMCFG);
+        if (rdev->flags & RADEON_IS_IGP)
+                mc_arb_ramcfg = RREG32(FUS_MC_ARB_RAMCFG);
+        else
+                mc_arb_ramcfg = RREG32(MC_ARB_RAMCFG);
 
         switch (rdev->config.evergreen.max_tile_pipes) {
         case 1:
diff --git a/drivers/gpu/drm/radeon/evergreend.h b/drivers/gpu/drm/radeon/evergreend.h
index 94533849927e..fc40e0cc3451 100644
--- a/drivers/gpu/drm/radeon/evergreend.h
+++ b/drivers/gpu/drm/radeon/evergreend.h
@@ -200,6 +200,7 @@
 #define         BURSTLENGTH_SHIFT                               9
 #define         BURSTLENGTH_MASK                                0x00000200
 #define         CHANSIZE_OVERRIDE                               (1 << 11)
+#define FUS_MC_ARB_RAMCFG                               0x2768
 #define MC_VM_AGP_TOP                                   0x2028
 #define MC_VM_AGP_BOT                                   0x202C
 #define MC_VM_AGP_BASE                                  0x2030