[PATCH 3.18 08/39] spi: imx: use pio mode for i.mx6dl

From: Greg Kroah-Hartman
Date: Mon Feb 09 2015 - 03:47:07 EST

3.18-stable review patch. If anyone has any objections, please let me know.


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) {

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