This is a note to let you know that I've just added the patch titled
spi: imx: use pio mode for i.mx6dl
to the 3.18-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-use-pio-mode-for-i.mx6dl.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From a02bb401f8ae264be782ee57d98bdd99f14c8022 Mon Sep 17 00:00:00 2001
From: Robin Gong <b38343@xxxxxxxxxxxxx>
Date: Tue, 3 Feb 2015 10:25:53 +0800
Subject: spi: imx: use pio mode for i.mx6dl
From: Robin Gong <b38343@xxxxxxxxxxxxx>
commit a02bb401f8ae264be782ee57d98bdd99f14c8022 upstream.
For TKT238285 hardware issue which may cause txfifo store data twice can only
be caught on i.mx6dl, we use pio mode instead of DMA mode on i.mx6dl.
Fixes: f62caccd12c17e4 (spi: spi-imx: add DMA support)
Signed-off-by: Robin Gong <b38343@xxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/spi/spi-imx.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -823,6 +823,10 @@ static int spi_imx_sdma_init(struct devi
struct dma_slave_config slave_config = {};
int ret;
+ /* use pio mode for i.mx6dl chip TKT238285 */
+ if (of_machine_is_compatible("fsl,imx6dl"))
+ return 0;
+
/* Prepare for TX DMA: */
master->dma_tx = dma_request_slave_channel(dev, "tx");
if (!master->dma_tx) {
Patches currently in stable-queue which might be from b38343@xxxxxxxxxxxxx are
queue-3.18/spi-imx-use-pio-mode-for-i.mx6dl.patch
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