| Message ID | 20190115065832.23705-1-vigneshr@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | spi: omap2-mcspi: Fix DMA and FIFO event trigger size mismatch | expand |
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@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> > --- > 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.
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;
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> --- drivers/spi/spi-omap2-mcspi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)