diff options
| author | Vignesh R <vigneshr@ti.com> | 2019-01-15 09:58:32 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-01-15 16:17:04 +0300 |
| commit | baf8b9f8d260c55a86405f70a384c29cda888476 (patch) | |
| tree | c24ed26f0305ea7aa105c028ea1313d7ffa65c92 | |
| parent | aa54c1c9d90e6db75190813907190fadcce1bf45 (diff) | |
| download | linux-baf8b9f8d260c55a86405f70a384c29cda888476.tar.xz | |
spi: omap2-mcspi: Fix DMA and FIFO event trigger size mismatch
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@vger.kernel.org
Reported-by: David Lechner <david@lechnology.com>
Tested-by: David Lechner <david@lechnology.com>
Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | drivers/spi/spi-omap2-mcspi.c | 4 |
1 files 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; |