[PATCH AUTOSEL 5.13 050/219] spi: imx: fix ERR009165

From: Sasha Levin
Date: Thu Sep 09 2021 - 08:12:17 EST


From: Robin Gong <yibin.gong@xxxxxxx>

[ Upstream commit 980f884866eed4dda2a18de888c5a67dde67d640 ]

Change to XCH mode even in dma mode, please refer to the below
errata:
https://www.nxp.com/docs/en/errata/IMX6DQCE.pdf

Signed-off-by: Robin Gong <yibin.gong@xxxxxxx>
Reviewed-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Acked-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Shawn Guo <shawnguo@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/spi/spi-imx.c | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 2872993550bd..ac86b3d1052d 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -622,8 +622,8 @@ static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
ctrl |= mx51_ecspi_clkdiv(spi_imx, spi_imx->spi_bus_clk, &clk);
spi_imx->spi_bus_clk = clk;

- if (spi_imx->usedma)
- ctrl |= MX51_ECSPI_CTRL_SMC;
+ /* ERR009165: work in XHC mode as PIO */
+ ctrl &= ~MX51_ECSPI_CTRL_SMC;

writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);

@@ -637,7 +637,7 @@ static void mx51_setup_wml(struct spi_imx_data *spi_imx)
* and enable DMA request.
*/
writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml - 1) |
- MX51_ECSPI_DMA_TX_WML(spi_imx->wml) |
+ MX51_ECSPI_DMA_TX_WML(0) |
MX51_ECSPI_DMA_RXT_WML(spi_imx->wml) |
MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN |
MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA);
@@ -1253,10 +1253,6 @@ static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
{
int ret;

- /* use pio mode for i.mx6dl chip TKT238285 */
- if (of_machine_is_compatible("fsl,imx6dl"))
- return 0;
-
spi_imx->wml = spi_imx->devtype_data->fifo_size / 2;

/* Prepare for TX DMA: */
--
2.30.2