* [PATCH] dmaengine: omap-dma: Allow DMA controller to prefetch data
@ 2012-11-19 16:37 Mark A. Greer
2013-01-15 18:52 ` Mark A. Greer
0 siblings, 1 reply; 2+ messages in thread
From: Mark A. Greer @ 2012-11-19 16:37 UTC (permalink / raw)
To: linux-arm-kernel
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
^ permalink raw reply related [flat|nested] 2+ messages in thread* [PATCH] dmaengine: omap-dma: Allow DMA controller to prefetch data
2012-11-19 16:37 [PATCH] dmaengine: omap-dma: Allow DMA controller to prefetch data Mark A. Greer
@ 2013-01-15 18:52 ` Mark A. Greer
0 siblings, 0 replies; 2+ messages in thread
From: Mark A. Greer @ 2013-01-15 18:52 UTC (permalink / raw)
To: linux-arm-kernel
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
Ping?
^ permalink raw reply [flat|nested] 2+ messages in thread
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