Re: [PATCH] spi: omap2-mcspi: Fix DMA and FIFO event trigger size mismatch

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On 1/15/19 12:58 AM, Vignesh R wrote:
Commit b682cffa3ac6 ("spi: omap2-mcspi: Set FIFO DMA trigger level to word length")
broke SPI transfers where bits_per_word != 8. This is because of
mimsatch between McSPI FIFO level event trigger size (SPI word length) and
DMA request size(word length * maxburst). This leads to data
corruption, lockup and errors like:

	spi1.0: EOW timed out

Fix this by setting DMA maxburst size to 1 so that
McSPI FIFO level event trigger size matches DMA request size.

Fixes: b682cffa3ac6 ("spi: omap2-mcspi: Set FIFO DMA trigger level to word length")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: David Lechner <david@xxxxxxxxxxxxxx>
Tested-by: David Lechner <david@xxxxxxxxxxxxxx>
Signed-off-by: Vignesh R <vigneshr@xxxxxx>
---
  drivers/spi/spi-omap2-mcspi.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index 2fd8881fcd65..8be304379628 100644
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -623,8 +623,8 @@ omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
  	cfg.dst_addr = cs->phys + OMAP2_MCSPI_TX0;
  	cfg.src_addr_width = width;
  	cfg.dst_addr_width = width;
-	cfg.src_maxburst = es;
-	cfg.dst_maxburst = es;
+	cfg.src_maxburst = 1;
+	cfg.dst_maxburst = 1;
rx = xfer->rx_buf;
  	tx = xfer->tx_buf;


Works for me.



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