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authorMisael Lopez Cruz <misael.lopez@ti.com>2016-09-16 10:53:15 (GMT)
committerVinod Koul <vinod.koul@intel.com>2016-10-01 06:05:27 (GMT)
commite7b2acfc79f052d023bf15bb6f82c90166ba74b5 (patch)
treebe0d0a1f5fd140777a3494ae6ea22187a2e06655 /drivers/dma
parentd4c77c0532e2eceaccdeeec493b2e39666c97406 (diff)
downloadlinux-e7b2acfc79f052d023bf15bb6f82c90166ba74b5.tar.xz
dmaengine: omap-dma: Enable burst and data pack for SG
Enable the burst and data pack modes for the scatter-gather in order to improve the throughput of the data transfers. The improvement has been verified with MMC HS200 mode in the DRA72 EVM using the iozone tool to compare the read throughput (in kB/s) with and without burst/pack for different reclens (in kB). With reclen Baseline sDMA burst/pack ------ -------- --------------- 64 46568 50820 128 57564 63413 256 65634 74937 512 72427 83483 1024 74563 84504 2048 76265 86079 4096 78045 87335 8192 78989 88154 16384 81265 91034 Signed-off-by: Misael Lopez Cruz <misael.lopez@ti.com> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/omap-dma.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index 1b7f5f3..7ca27d4 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -904,13 +904,16 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
d->es = es;
d->ccr = c->ccr | CCR_SYNC_FRAME;
- if (dir == DMA_DEV_TO_MEM)
+ if (dir == DMA_DEV_TO_MEM) {
d->ccr |= CCR_DST_AMODE_POSTINC | CCR_SRC_AMODE_CONSTANT;
- else
+ d->csdp = CSDP_DST_BURST_64 | CSDP_DST_PACKED;
+ } else {
d->ccr |= CCR_DST_AMODE_CONSTANT | CCR_SRC_AMODE_POSTINC;
+ d->csdp = CSDP_SRC_BURST_64 | CSDP_SRC_PACKED;
+ }
d->cicr = CICR_DROP_IE | CICR_BLOCK_IE;
- d->csdp = es;
+ d->csdp |= es;
if (dma_omap1()) {
d->cicr |= CICR_TOUT_IE;