linux-kernel - [PATCH v2] mtd: onenand: omap2: Pass correct flags for prep_dma

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Date:   Tue, 7 Jan 2020 10:45:44 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <kyungmin.park@...sung.com>, <miquel.raynal@...tlin.com>,
        <aaro.koskinen@....fi>, <vigneshr@...com>, <hns@...delico.com>
CC:     <tony@...mide.com>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: [PATCH v2] mtd: onenand: omap2: Pass correct flags for prep_dma_memcpy

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

Fixes: 3ed6a4d1de2c5 (" mtd: onenand: omap2: Convert to use dmaengine for memcp")
Reported-by: Aaro Koskinen <aaro.koskinen@....fi>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
Tested-by: H. Nikolaus Schaller <hns@...delico.com>
Tested-by: Aaro Koskinen <aaro.koskinen@....fi>
---
Hi,

Changes since v1:
- Typo fixed in the commit message
- Added the Tested-by from Aaro and Nikolaus

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@darkstar.musicnaut.iki.fi/

Regards,
Peter

 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,
+				       DMA_CTRL_ACK | DMA_PREP_INTERRUPT);
 	if (!tx) {
 		dev_err(&c->pdev->dev, "Failed to prepare DMA memcpy\n");
 		return -EIO;
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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