via: some PCI posting flushes

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

2 files changed, 5 insertions, 1 deletions

diff --git a/drivers/char/drm/via_dma.c b/drivers/char/drm/via_dma.c
index a691ae74129d..2f72cbefc2ff 100644
--- a/drivers/char/drm/via_dma.c
+++ b/drivers/char/drm/via_dma.c
@@ -480,6 +480,7 @@ static int via_hook_segment(drm_via_private_t * dev_priv,
                         VIA_WRITE(VIA_REG_TRANSET, (HC_ParaType_PreCR << 16));
                         VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_hi);
                         VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_lo);
+                        VIA_READ(VIA_REG_TRANSPACE);
                 }
         }
         return paused;
@@ -557,8 +558,9 @@ static void via_cmdbuf_start(drm_via_private_t * dev_priv)
 
         VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_hi);
         VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_lo);
-
+        DRM_WRITEMEMORYBARRIER();
         VIA_WRITE(VIA_REG_TRANSPACE, command | HC_HAGPCMNT_MASK);
+        VIA_READ(VIA_REG_TRANSPACE);
 }
 
 static void via_pad_cache(drm_via_private_t * dev_priv, int qwords)
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);
 }
 
 /*