linux-kernel - [PATCH v1] spi: imx: use pio mode for i.mx6dl

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Message-ID: <1422930353-4339-1-git-send-email-b38343@freescale.com>
Date:	Tue, 3 Feb 2015 10:25:53 +0800
From:	Robin Gong <b38343@...escale.com>
To:	<broonie@...nel.org>, <l.stach@...gutronix.de>,
	<shawn.guo@...aro.org>
CC:	<Frank.Li@...escale.com>, <Fabio.Estevam@...escale.com>,
	<hs@...x.de>, <linux-spi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v1] spi: imx: use pio mode for i.mx6dl

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.

Signed-off-by: Robin Gong <b38343@...escale.com>
---
 drivers/spi/spi-imx.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 961b97d..fe1b769 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -823,6 +823,10 @@ static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
 	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) {
-- 
1.9.1

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