From ffe59b29308791c9600ab86de2ca070d742c107d Mon Sep 17 00:00:00 2001 From: Jiada Wang Date: Wed, 14 May 2014 18:22:13 -0700 Subject: [PATCH] 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 Signed-off-by: Vinod Koul --- drivers/dma/imx-sdma.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 19041ce..1287146 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++; -- 2.7.4