The patch titled atmel_spi: reload RCR before TCR has been removed from the -mm tree. Its filename was atmel_spi-reload-rcr-before-tcr.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ Subject: atmel_spi: reload RCR before TCR From: Rini van Zetten <rini@xxxxxxxx> We have a wifi module connected to the spi bus and got sometimes FIFO overrun errors on the spi bus. After some investigation i found that the driver loads the TCR (transmit count) register before the RCR (receive count). When the transfer list is not empty the atmel_spi_next_message is called while tx and rx are enabled. As soon as the TCR is loaded, hardware starts transfer and causes a rx fifo overrun because the RCR is not loaded yet. Load the RCR before the TCR. After this patch the fifo overrun disapears at out setup. Signed-off-by: Haavard Skinnemoen <hskinnemoen@xxxxxxxxx> Signed-off-by: Rini van Zetten <rini@xxxxxxxx> Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/spi/atmel_spi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN drivers/spi/atmel_spi.c~atmel_spi-reload-rcr-before-tcr drivers/spi/atmel_spi.c --- a/drivers/spi/atmel_spi.c~atmel_spi-reload-rcr-before-tcr +++ a/drivers/spi/atmel_spi.c @@ -195,8 +195,8 @@ static void atmel_spi_next_xfer(struct s xfer, xfer->len, xfer->tx_buf, xfer->tx_dma, xfer->rx_buf, xfer->rx_dma, spi_readl(as, IMR)); - spi_writel(as, TCR, len); spi_writel(as, RCR, len); + spi_writel(as, TCR, len); spi_writel(as, PTCR, SPI_BIT(TXTEN) | SPI_BIT(RXTEN)); } _ Patches currently in -mm which might be from rini@xxxxxxxx are - To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html