diff options
| author | Jiada Wang <jiada_wang@mentor.com> | 2014-05-14 18:22:13 -0700 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2014-06-01 22:22:26 +0530 |
| commit | ffe59b29308791c9600ab86de2ca070d742c107d (patch) | |
| tree | b4060dc64613790759022ad918cba2e91f5a5a3b /drivers/dma | |
| parent | a15783c34f6304e85f7d810e71316c1c3ba1fe69 (diff) | |
| download | linux-ffe59b29308791c9600ab86de2ca070d742c107d.tar.bz2 | |
dmaengine: imx: correct sdmac->status for cyclic dma tx
In cyclic dma tx's handler sdma_handle_channel_loop(),
SDMA channel statue is set to either DMA_ERROR or DMA_IN_PROGRESS
based on each period's status. This has the following issues:
1) If one period's status is BD_RROR, then channel status
will be set to DMA_ERROR, but it will be overwritten to DMA_IN_PROGRESS
if the following periods are OK.
2) DMA client may call sdma_control(DMA_TERMINATE_ALL) to stop the cyclic dma
operation, sdma channel status will be set to DMA_ERROR,
but if after this handler is called, then again the channel status will be overwritten
to DMA_IN_PROGRESS. Then the following dmaengine_prep_dma_cyclic() will always fail,
as channel status is DMA_IN_PROGRESS.
As in cyclic dma tx, channel status will be initially set to DMA_IN_PROGRESS,
driver only needs to change it to DMA_ERROR, when something wrong happens
(one period status is wrong, or stoped by client explicitly).
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/imx-sdma.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 19041cefabb1..128714622bf5 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -607,8 +607,6 @@ static void sdma_handle_channel_loop(struct sdma_channel *sdmac) if (bd->mode.status & BD_RROR) sdmac->status = DMA_ERROR; - else - sdmac->status = DMA_IN_PROGRESS; bd->mode.status |= BD_DONE; sdmac->buf_tail++; |