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Put PRIMEND write after DMAPADs to prevent race condition.

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This commit is contained in:
Gareth Hughes 2001-01-31 18:24:57 +00:00
parent 5f15407b9c
commit c76a35b3c8
1 changed files with 3 additions and 6 deletions
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9
linux/mga_dma.c
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@ -1158,10 +1158,6 @@ void mga_do_dma_flush( drm_mga_private_t *dev_priv )
tail = primary->tail + dev_priv->primary->offset;
mga_flush_write_combine();
MGA_WRITE( MGA_PRIMEND, tail | MGA_PRIMNOSTART | MGA_PAGPXFER );
BEGIN_DMA( 1 );
DMA_BLOCK( MGA_DMAPAD, 0x00000000,
@ -1171,6 +1167,9 @@ void mga_do_dma_flush( drm_mga_private_t *dev_priv )
ADVANCE_DMA();
mga_flush_write_combine();
MGA_WRITE( MGA_PRIMEND, tail | MGA_PRIMNOSTART | MGA_PAGPXFER );
head = *primary->head;
DRM_DEBUG( " head = 0x%06lx\n", head - dev_priv->primary->offset );
@ -1209,7 +1208,6 @@ void mga_do_dma_wrap( drm_mga_private_t *dev_priv )
tail = primary->tail + dev_priv->primary->offset;
mga_flush_write_combine();
MGA_WRITE( MGA_PRIMEND, tail | MGA_PRIMNOSTART | MGA_PAGPXFER );
spin_lock_irqsave( &primary->lock, flags );
@ -1265,7 +1263,6 @@ static void mga_dma_service( int irq, void *device, struct pt_regs *regs )
DRM_DEBUG( " tail = 0x%06x\n", tail - dev_priv->primary->offset );
mga_flush_write_combine();
MGA_WRITE( MGA_PRIMADDRESS, head | MGA_DMA_GENERAL );
MGA_WRITE( MGA_PRIMEND, tail | MGA_PRIMNOSTART | MGA_PAGPXFER );
}