diff options
| author | Zeng Zhaoming <b32542@freescale.com> | 2011-07-18 11:55:41 +0800 |
|---|---|---|
| committer | Jason Liu <r64343@freescale.com> | 2012-07-20 13:14:46 +0800 |
| commit | efda1d30a46e77e56ad46bac1bc9303e39465752 (patch) | |
| tree | 8803e0c0e8f0220749f21abe6e4c5e2e4ce98d59 /drivers/dma | |
| parent | 48f93c74bdf669dada737c62de44cc120c90f17f (diff) | |
ENGR00152287-3 SDMA: Fix sdma cache bufferable issue
MX6Q desclare dma memory bufferable, which cause sdma
load context failed in 60% possibility.
To fix it, we need to add dsb to flush write buffer before
start dma transfer.
Signed-off-by: Zeng Zhaoming <b32542@freescale.com>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/imx-sdma.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 0ed6c6e99ff4..3642ca4d07bd 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -373,6 +373,7 @@ static int sdma_run_channel(struct sdma_channel *sdmac) init_completion(&sdmac->done); + wmb(); __raw_writel(1 << channel, sdma->regs + SDMA_H_START); ret = wait_for_completion_timeout(&sdmac->done, HZ); @@ -768,6 +769,7 @@ out: static void sdma_enable_channel(struct sdma_engine *sdma, int channel) { + wmb(); __raw_writel(1 << channel, sdma->regs + SDMA_H_START); } |