[Sound-open-firmware] [PATCH] dma: dw: write back linked list descriptors

The DMA linked list descriptors must be written back from cache so that the DMA engine can read them.

Signed-off-by: Liam Girdwood liam.r.girdwood@linux.intel.com --- src/drivers/dw-dma.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/src/drivers/dw-dma.c b/src/drivers/dw-dma.c index b288049..a28281a 100644 --- a/src/drivers/dw-dma.c +++ b/src/drivers/dw-dma.c @@ -611,6 +611,10 @@ static int dw_dma_set_config(struct dma *dma, int channel, #endif }

+ /* write back descriptors so DMA engine can read them directly */ + dcache_writeback_region(p->chan[channel].lli, + sizeof(struct dw_lli2) * p->chan[channel].desc_count); + p->chan[channel].status = COMP_STATE_PREPARE; out: spin_unlock_irq(&dma->lock, flags);