From mboxrd@z Thu Jan 1 00:00:00 1970 From: mgreer@animalcreek.com (Mark A. Greer) Date: Mon, 19 Nov 2012 09:37:27 -0700 Subject: [PATCH] dmaengine: omap-dma: Allow DMA controller to prefetch data Message-ID: <20121119163727.GB9758@animalcreek.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: "Mark A. Greer" 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 CC: P?ter Ujfalusi Signed-off-by: Mark A. Greer --- 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