via: some PCI posting flushes

Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/char/drm/via_dmablit.c b/drivers/char/drm/via_dmablit.c
index 806f9ce5f47b..2054d5773717 100644
--- a/drivers/char/drm/via_dmablit.c
+++ b/drivers/char/drm/via_dmablit.c
@@ -218,7 +218,9 @@ via_fire_dmablit(drm_device_t *dev, drm_via_sg_info_t *vsg, int engine)
         VIA_WRITE(VIA_PCI_DMA_MR0  + engine*0x04, VIA_DMA_MR_CM | VIA_DMA_MR_TDIE);
         VIA_WRITE(VIA_PCI_DMA_BCR0 + engine*0x10, 0);
         VIA_WRITE(VIA_PCI_DMA_DPR0 + engine*0x10, vsg->chain_start);
+        DRM_WRITEMEMORYBARRIER();
         VIA_WRITE(VIA_PCI_DMA_CSR0 + engine*0x04, VIA_DMA_CSR_DE | VIA_DMA_CSR_TS);
+        VIA_READ(VIA_PCI_DMA_CSR0 + engine*0x04);
 }
 
 /*