[PATCH] mtd: onenand: omap2: Pass correct flags for prep_dma_memcpy

From: Peter Ujfalusi
Date: Sat Jan 04 2020 - 02:34:10 EST

The commit converting the driver to DMAengine was missing the flags for
the memcpy prepare call.
It went unnoticed since the omap-dma drive was ignoring them.

Fixes: 3ed6a4d1de2c5 (" mtd: onenand: omap2: Convert to use dmaengine for memcp")
Reported-by: Aaro Koskinen <aaro.koskinen@xxxxxx>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>

Aaro reported [1] a failure on omap2-onenand pointing to
4689d35c765c696bdf0535486a990038b242a26b. It looks like the root cause is the
conversion of omap2-onenand to DMAengine which missed the flags.

Basically the client is waiting for a callback without asking for it. This
certainly causes timeout.

I have not tested the patch, but it should fix the issue.

[1] https://lore.kernel.org/lkml/20200103081726.GD15023@xxxxxxxxxxxxxxxxxxxxxxxxx/

drivers/mtd/nand/onenand/omap2.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/onenand/omap2.c b/drivers/mtd/nand/onenand/omap2.c
index edf94ee54ec7..71a632b815aa 100644
--- a/drivers/mtd/nand/onenand/omap2.c
+++ b/drivers/mtd/nand/onenand/omap2.c
@@ -328,7 +328,8 @@ static inline int omap2_onenand_dma_transfer(struct omap2_onenand *c,
struct dma_async_tx_descriptor *tx;
dma_cookie_t cookie;

- tx = dmaengine_prep_dma_memcpy(c->dma_chan, dst, src, count, 0);
+ tx = dmaengine_prep_dma_memcpy(c->dma_chan, dst, src, count,
if (!tx) {
dev_err(&c->pdev->dev, "Failed to prepare DMA memcpy\n");
return -EIO;

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