This is a note to let you know that I've just added the patch titled
spi: imx: Fix small DMA transfers
to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-imx-fix-small-dma-transfers.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f6ee9b582d2db652497b73c1f117591dfb6d3a90 Mon Sep 17 00:00:00 2001
From: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Date: Fri, 24 Jul 2015 15:01:08 +0200
Subject: spi: imx: Fix small DMA transfers
From: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
commit f6ee9b582d2db652497b73c1f117591dfb6d3a90 upstream.
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@xxxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/spi/spi-imx.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -201,8 +201,9 @@ static bool spi_imx_can_dma(struct spi_m
{
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;
}
Patches currently in stable-queue which might be from s.hauer@xxxxxxxxxxxxxx are
queue-4.1/spi-imx-fix-small-dma-transfers.patch
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