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Blackfin: add SSYNC to set_dma_sg() for descriptor fetching

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Make sure the internal core buffers are flushed before telling the DMA
engine to fetch the descriptor structure so that it gets the right values.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Sonic Zhang 2009-06-01 00:49:32 -04:00 committed by Mike Frysinger
parent 9b9bfded62
commit ea8538a039
1 changed files with 7 additions and 1 deletions
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8
arch/blackfin/include/asm/dma.h
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@ -206,10 +206,16 @@ static inline unsigned long get_dma_curr_addr(unsigned int channel)
static inline void set_dma_sg(unsigned int channel, struct dmasg *sg, int ndsize)
{
/* Make sure the internal data buffers in the core are drained
* so that the DMA descriptors are completely written when the
* DMA engine goes to fetch them below.
*/
SSYNC();
dma_ch[channel].regs->next_desc_ptr = sg;
dma_ch[channel].regs->cfg =
(dma_ch[channel].regs->cfg & ~(0xf << 8)) |
((ndsize & 0xf) << 8);
dma_ch[channel].regs->next_desc_ptr = sg;
}
static inline int dma_channel_active(unsigned int channel)