From: Sascha Hauer <s.hauer@pengutronix.de>
To: Mark Brown <broonie@kernel.org>
Cc: linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel@pengutronix.de
Subject: [PATCH] spi: imx: Fix small DMA transfers
Date: Fri, 24 Jul 2015 15:01:08 +0200 [thread overview]
Message-ID: <1437742868-23430-1-git-send-email-s.hauer@pengutronix.de> (raw)
DMA transfers must be greater than the watermark level size. spi_imx->rx_wml
and spi_imx->tx_wml contain the watermark level in 32bit words whereas struct
spi_transfer contains the transfer len in bytes. Fix the check if DMA is
possible for a transfer accordingly. This fixes transfers with sizes between
33 and 128 bytes for which previously was claimed that DMA is possible.
Fixes: f62caccd12c17e4 (spi: spi-imx: add DMA support)
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Cc: stable@vger.kernel.org
---
drivers/spi/spi-imx.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index f08e812..412b9c8 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -201,8 +201,9 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi,
{
struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
- if (spi_imx->dma_is_inited && (transfer->len > spi_imx->rx_wml)
- && (transfer->len > spi_imx->tx_wml))
+ if (spi_imx->dma_is_inited
+ && transfer->len > spi_imx->rx_wml * sizeof(u32)
+ && transfer->len > spi_imx->tx_wml * sizeof(u32))
return true;
return false;
}
--
2.1.4
reply other threads:[~2015-07-24 13:01 UTC|newest]
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