openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Russell King 2013-11-03 11:17:11 +00:00
parent 470b23f730
commit 893e63e301
1 changed files with 20 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/dma/omap-dma.c
View File

@ -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);