From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Sun, 3 Nov 2013 11:17:11 +0000 (+0000)
Subject: dmaengine: omap-dma: improve efficiency loading C.SA/C.EI/C.FI registers
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=893e63e301e37cd3be7afb55c95eb8ef6ead304b;p=openwrt%2Fstaging%2Fblogic.git

dmaengine: omap-dma: improve efficiency loading C.SA/C.EI/C.FI registers

The only thing which changes is which registers are written, so put this
in local variables instead.  This results in smaller code.

Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index d1641aa9d113..06727a78e883 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -275,17 +275,21 @@ static void omap_dma_start_sg(struct omap_chan *c, struct omap_desc *d,
 	unsigned idx)
 {
 	struct omap_sg *sg = d->sg + idx;
+	unsigned cxsa, cxei, cxfi;
 
 	if (d->dir == DMA_DEV_TO_MEM) {
-		c->plat->dma_write(sg->addr, CDSA, c->dma_ch);
-		c->plat->dma_write(0, CDEI, c->dma_ch);
-		c->plat->dma_write(0, CDFI, c->dma_ch);
+		cxsa = CDSA;
+		cxei = CDEI;
+		cxfi = CDFI;
 	} else {
-		c->plat->dma_write(sg->addr, CSSA, c->dma_ch);
-		c->plat->dma_write(0, CSEI, c->dma_ch);
-		c->plat->dma_write(0, CSFI, c->dma_ch);
+		cxsa = CSSA;
+		cxei = CSEI;
+		cxfi = CSFI;
 	}
 
+	c->plat->dma_write(sg->addr, cxsa, c->dma_ch);
+	c->plat->dma_write(0, cxei, c->dma_ch);
+	c->plat->dma_write(0, cxfi, c->dma_ch);
 	c->plat->dma_write(sg->en, CEN, c->dma_ch);
 	c->plat->dma_write(sg->fn, CFN, c->dma_ch);
 
@@ -296,6 +300,7 @@ static void omap_dma_start_desc(struct omap_chan *c)
 {
 	struct virt_dma_desc *vd = vchan_next_desc(&c->vc);
 	struct omap_desc *d;
+	unsigned cxsa, cxei, cxfi;
 
 	if (!vd) {
 		c->desc = NULL;
@@ -312,15 +317,18 @@ static void omap_dma_start_desc(struct omap_chan *c)
 		c->plat->dma_write(d->ccr >> 16, CCR2, c->dma_ch);
 
 	if (d->dir == DMA_DEV_TO_MEM) {
-		c->plat->dma_write(d->dev_addr, CSSA, c->dma_ch);
-		c->plat->dma_write(0, CSEI, c->dma_ch);
-		c->plat->dma_write(d->fi, CSFI, c->dma_ch);
+		cxsa = CSSA;
+		cxei = CSEI;
+		cxfi = CSFI;
 	} else {
-		c->plat->dma_write(d->dev_addr, CDSA, c->dma_ch);
-		c->plat->dma_write(0, CDEI, c->dma_ch);
-		c->plat->dma_write(d->fi, CDFI, c->dma_ch);
+		cxsa = CDSA;
+		cxei = CDEI;
+		cxfi = CDFI;
 	}
 
+	c->plat->dma_write(d->dev_addr, cxsa, c->dma_ch);
+	c->plat->dma_write(0, cxei, c->dma_ch);
+	c->plat->dma_write(d->fi, cxfi, c->dma_ch);
 	c->plat->dma_write(d->csdp, CSDP, c->dma_ch);
 
 	omap_dma_start_sg(c, d, 0);