[PATCH 14/26] dmaengine: omap-dma: move barrier to omap_dma_start_desc()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



We don't need to issue a barrier for every segment of a DMA transfer;
doing this just once per descriptor will do.

Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
---
 drivers/dma/omap-dma.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index 49609275b2e7..49b303296d75 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -195,7 +195,6 @@ static void omap_dma_start(struct omap_chan *c, struct omap_desc *d)
 
 	val = c->plat->dma_read(CCR, c->dma_ch);
 	val |= CCR_ENABLE;
-	mb();
 	c->plat->dma_write(val, CCR, c->dma_ch);
 }
 
@@ -301,6 +300,13 @@ static void omap_dma_start_desc(struct omap_chan *c)
 	c->desc = d = to_omap_dma_desc(&vd->tx);
 	c->sgidx = 0;
 
+	/*
+	 * This provides the necessary barrier to ensure data held in
+	 * DMA coherent memory is visible to the DMA engine prior to
+	 * the transfer starting.
+	 */
+	mb();
+
 	c->plat->dma_write(d->ccr, CCR, c->dma_ch);
 	if (dma_omap1())
 		c->plat->dma_write(d->ccr >> 16, CCR2, c->dma_ch);
-- 
1.8.3.1

--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Arm (vger)]     [ARM Kernel]     [ARM MSM]     [Linux Tegra]     [Linux WPAN Networking]     [Linux Wireless Networking]     [Maemo Users]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux