[PATCH] dmaengine: omap-dma: Allow DMA controller to prefetch data

[mgreer@animalcreek.com (Mark A. Greer)]

On Mon, Nov 19, 2012 at 09:37:27AM -0700, Mark A. Greer wrote:
> From: "Mark A. Greer" <mgreer@animalcreek.com>
> 
> Enable DMA prefetching for non-cyclic DMAs by setting the
> 'OMAP_DMA_DST_SYNC_PREFETCH' flag when there is a destination
> synchronized DMA transfer.  Prefetching is not allowed on
> source synchronized DMA transfers.  It is not allowed on
> cyclic DMAs either since that can cause issues with some
> users (e.g., suspending/resuming audio).
> 
> CC: Russell King <rmk+kernel@arm.linux.org.uk>
> CC: P?ter Ujfalusi <peter.ujfalusi@ti.com>
> Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
> ---
>  drivers/dma/omap-dma.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
> index bb2d8e7..3932eab 100644
> --- a/drivers/dma/omap-dma.c
> +++ b/drivers/dma/omap-dma.c
> @@ -310,7 +310,7 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
>  		dev_addr = c->cfg.dst_addr;
>  		dev_width = c->cfg.dst_addr_width;
>  		burst = c->cfg.dst_maxburst;
> -		sync_type = OMAP_DMA_DST_SYNC;
> +		sync_type = OMAP_DMA_DST_SYNC_PREFETCH;
>  	} else {
>  		dev_err(chan->device->dev, "%s: bad direction?\n", __func__);
>  		return NULL;
> -- 
> 1.7.12

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