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mmc: dw_mmc: fix the error handling for dma operation 

When dma->start is failed,then it has to fall back to PIO mode
for current transfer.

But Host controller was already set to bits relevant to DMA operation.
If needs to use the PIO mode, Host controller has to stop the DMA
operation. (It's more stable than now.)

When it occurred error, it's not running any request.

Fixes: 3fc7eaef44 ("mmc: dw_mmc: Add external dma interface support")
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Cc: <stable@vger.kernel.org> # v4.3+
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Jaehoon Chung 2016-11-21 10:51:48 +09:00 committed by Ulf Hansson
parent b0921d5c9e
commit 647f80a1f2
1 changed files with 1 additions and 0 deletions
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drivers/mmc/host/dw_mmc.c
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@ -1058,6 +1058,7 @@ static int dw_mci_submit_data_dma(struct dw_mci *host, struct mmc_data *data)
spin_unlock_irqrestore(&host->irq_lock, irqflags);
if (host->dma_ops->start(host, sg_len)) {
host->dma_ops->stop(host);
/* We can't do DMA, try PIO for this one */
dev_dbg(host->dev,
"%s: fall back to PIO mode for current transfer\n",