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>

1 files changed, 20 insertions, 12 deletions

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);