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authorJaehoon Chung <jh80.chung@samsung.com>2016-11-21 04:51:48 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2016-11-21 13:08:28 +0300
commit647f80a1f233bb66fc58fb25664d029e0f12f3ae (patch)
tree01cf3ff978557f6eab79ce9c3524989cf04b54ca /drivers/mmc
parentb0921d5c9ed6ffa8a4d6afc5ee5f136b87445f14 (diff)
downloadlinux-647f80a1f233bb66fc58fb25664d029e0f12f3ae.tar.xz
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: 3fc7eaef44db ("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>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/dw_mmc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 50a674be6655..df478ae72e23 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -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",