diff options
| author | Zeng Zhaoming <b32542@freescale.com> | 2011-07-18 11:55:41 +0800 |
|---|---|---|
| committer | Zeng Zhaoming <b32542@freescale.com> | 2011-07-19 03:43:39 +0800 |
| commit | 4e6214f2eb45427867bd72947c0923f3aa89b3b3 (patch) | |
| tree | 4b0c1239db543f621274204908d2b9d690006d69 /drivers | |
| parent | 29b043e451370314f38c16bebf10bd9a3baac839 (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')
| -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); } |