drm/radeon/kms: fix IH writeback on r6xx+ on big endian machines

agd5f: fix commit message.
Signed-off-by: NCedric Cano <ccano@interfaceconcept.com>
Reviewed-by: NMichel Dänzer <michel@daenzer.net>
Signed-off-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/evergreen.c

@@ -2580,7 +2580,7 @@ static inline u32 evergreen_get_ih_wptr(struct radeon_device *rdev)
 	u32 wptr, tmp;
 
 	if (rdev->wb.enabled)
-		wptr = rdev->wb.wb[R600_WB_IH_WPTR_OFFSET/4];
+		wptr = le32_to_cpu(rdev->wb.wb[R600_WB_IH_WPTR_OFFSET/4]);
 	else
 		wptr = RREG32(IH_RB_WPTR);
 

drivers/gpu/drm/radeon/r600.c

@@ -3231,7 +3231,7 @@ static inline u32 r600_get_ih_wptr(struct radeon_device *rdev)
 	u32 wptr, tmp;
 
 	if (rdev->wb.enabled)
-		wptr = rdev->wb.wb[R600_WB_IH_WPTR_OFFSET/4];
+		wptr = le32_to_cpu(rdev->wb.wb[R600_WB_IH_WPTR_OFFSET/4]);
 	else
 		wptr = RREG32(IH_RB_WPTR);