* [PATCH] dmaengine: omap-dma: Enable burst and data pack for SG
@ 2016-09-16 10:53 Peter Ujfalusi
2016-10-01 6:05 ` Vinod Koul
0 siblings, 1 reply; 2+ messages in thread
From: Peter Ujfalusi @ 2016-09-16 10:53 UTC (permalink / raw)
To: vinod.koul, dan.j.williams
Cc: dmaengine, linux-kernel, linux-omap, linux-arm-kernel, tony,
linux, misael.lopez
From: Misael Lopez Cruz <misael.lopez@ti.com>
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>
---
drivers/dma/omap-dma.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index 1b7f5f32bf74..7ca27d4b1c54 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;
--
2.10.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] dmaengine: omap-dma: Enable burst and data pack for SG
2016-09-16 10:53 [PATCH] dmaengine: omap-dma: Enable burst and data pack for SG Peter Ujfalusi
@ 2016-10-01 6:05 ` Vinod Koul
0 siblings, 0 replies; 2+ messages in thread
From: Vinod Koul @ 2016-10-01 6:05 UTC (permalink / raw)
To: Peter Ujfalusi
Cc: dan.j.williams, dmaengine, linux-kernel, linux-omap,
linux-arm-kernel, tony, linux, misael.lopez
On Fri, Sep 16, 2016 at 01:53:15PM +0300, Peter Ujfalusi wrote:
> From: Misael Lopez Cruz <misael.lopez@ti.com>
>
> 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
Applied, thanks
--
~Vinod
^ permalink raw reply [flat|nested] 2+ messages in thread
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2016-10-01 6:05 ` Vinod Koul
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