drm/radeon/kms: fix vram base calculation on rs780/rs880

Avoid overflowing a 32 bit value. Signed-off-by: Alex Deucher <[email protected]> Cc: [email protected] Signed-off-by: Dave Airlie <[email protected]>
redpig · Dec 7, 2010 · 8961d52 · 8961d52
1 parent dd7cc55
commit 8961d52
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
@@ -1195,8 +1195,10 @@ void r600_vram_gtt_location(struct radeon_device *rdev, struct radeon_mc *mc)
 				mc->vram_end, mc->real_vram_size >> 20);
 	} else {
 		u64 base = 0;
-		if (rdev->flags & RADEON_IS_IGP)
-			base = (RREG32(MC_VM_FB_LOCATION) & 0xFFFF) << 24;
+		if (rdev->flags & RADEON_IS_IGP) {
+			base = RREG32(MC_VM_FB_LOCATION) & 0xFFFF;
+			base <<= 24;
+		}
 		radeon_vram_location(rdev, &rdev->mc, base);
 		rdev->mc.gtt_base_align = 0;
 		radeon_gtt_location(rdev, mc);