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authorThomas Hellstrom <thomas-at-tungstengraphics-dot-com>2007-05-08 15:48:39 +1000
committerDave Airlie <airlied@linux.ie>2007-05-08 15:48:39 +1000
commitef68d295508d52e792abf70d4f84461104d33b9d (patch)
treeaf18b6431392e34af5e6ab8b0bbf054ddbfc2801 /drivers
parenta0a6dd0b221260be1e3da725e6b49797e5fa7429 (diff)
via: Make sure we flush write-combining using a follow-up read.
Signed-off-by: Dave Airlie <airlied@linux.ie>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/char/drm/via_dma.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/char/drm/via_dma.c b/drivers/char/drm/via_dma.c
index 7635e859b87..13a9c5ca459 100644
--- a/drivers/char/drm/via_dma.c
+++ b/drivers/char/drm/via_dma.c
@@ -436,8 +436,10 @@ static int via_hook_segment(drm_via_private_t * dev_priv,
paused = 0;
via_flush_write_combine();
- *dev_priv->last_pause_ptr = pause_addr_lo;
+ (void) *(volatile uint32_t *)(via_get_dma(dev_priv) -1);
+ *paused_at = pause_addr_lo;
via_flush_write_combine();
+ (void) *paused_at;
reader = *(dev_priv->hw_addr_ptr);
ptr = ((volatile char *)paused_at - dev_priv->dma_ptr) +
dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr + 4;
@@ -536,7 +538,7 @@ static void via_cmdbuf_start(drm_via_private_t * dev_priv)
&pause_addr_hi, &pause_addr_lo, 1) - 1;
via_flush_write_combine();
- while(! *dev_priv->last_pause_ptr);
+ (void) *(volatile uint32_t *)dev_priv->last_pause_ptr;
VIA_WRITE(VIA_REG_TRANSET, (HC_ParaType_PreCR << 16));
VIA_WRITE(VIA_REG_TRANSPACE, command);