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via: Make sure we flush write-combining using a follow-up read.

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Signed-off-by: Dave Airlie <airlied@linux.ie>
This commit is contained in:
Thomas Hellstrom 2007-05-08 15:48:39 +10:00 committed by Dave Airlie
parent a0a6dd0b22
commit ef68d29550
1 changed files with 4 additions and 2 deletions
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6
drivers/char/drm/via_dma.c
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@ -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);