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[RFC,15/26] dmaengine: omap-dma: use cached CCR value when enabling DMA

Message ID E1Vyjvd-0005Ew-9c@rmk-PC.arm.linux.org.uk (mailing list archive)
State New, archived
Headers show

Commit Message

Russell King Jan. 2, 2014, 3:11 p.m. UTC 
We don't need to read-modify-write the CCR register; we already know
what value it should contain at this point.  Use the cached CCR value
when setting the enable bit.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 drivers/dma/omap-dma.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)
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Patch

diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index e212e0df9b42..98e77adeaeb3 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -180,7 +180,6 @@  static void omap_dma_clear_csr(struct omap_chan *c)
 static void omap_dma_start(struct omap_chan *c, struct omap_desc *d)
 {
 	struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device);
-	uint32_t val;
 
 	if (__dma_omap15xx(od->plat->dma_attr))
 		c->plat->dma_write(0, CPC, c->dma_ch);
@@ -192,9 +191,8 @@  static void omap_dma_start(struct omap_chan *c, struct omap_desc *d)
 	/* Enable interrupts */
 	c->plat->dma_write(d->cicr, CICR, c->dma_ch);
 
-	val = c->plat->dma_read(CCR, c->dma_ch);
-	val |= CCR_ENABLE;
-	c->plat->dma_write(val, CCR, c->dma_ch);
+	/* Enable channel */
+	c->plat->dma_write(d->ccr | CCR_ENABLE, CCR, c->dma_ch);
 }
 
 static void omap_dma_stop(struct omap_chan *c)