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Message-Id: <1351612730-19029-1-git-send-email-javier.martin@vista-silicon.com> Date: Tue, 30 Oct 2012 16:58:50 +0100 From: Javier Martin <javier.martin@...ta-silicon.com> To: linux-kernel@...r.kernel.org Cc: djbw@...com, vinod.koul@...el.com, Javier Martin <javier.martin@...ta-silicon.com> Subject: [PATCH] dmaengine: imx-dma: Disable use of hw_chain to fix sg_dma transfers. HW chaining is currently broken in imx-dma. It can be easily reproduced doing intensive accesses to a external MMC card and checking how the file system is corrupted. Preventing the driver to use HW chaining solves these issues. Signed-off-by: Javier Martin <javier.martin@...ta-silicon.com> --- drivers/dma/imx-dma.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c index 5084975..03f3b64 100644 --- a/drivers/dma/imx-dma.c +++ b/drivers/dma/imx-dma.c @@ -643,9 +643,8 @@ static int imxdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, break; } - imxdmac->hw_chaining = 1; - if (!imxdma_hw_chain(imxdmac)) - return -EINVAL; + imxdmac->hw_chaining = 0; + imxdmac->ccr_from_device = (mode | IMX_DMA_TYPE_FIFO) | ((IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) << 2) | CCR_REN; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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