| Message ID | 20200723004356.6390-3-jon.lin@rock-chips.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v3,1/3] spi: rockchip: Config spi rx dma burst size depend on xfer length | expand |
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index a451dacab5cf..75a8a9428ff8 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -291,7 +291,7 @@ static void rockchip_spi_pio_writer(struct rockchip_spi *rs) static void rockchip_spi_pio_reader(struct rockchip_spi *rs) { u32 words = readl_relaxed(rs->regs + ROCKCHIP_SPI_RXFLR); - u32 rx_left = rs->rx_left - words; + u32 rx_left = (rs->rx_left > words) ? rs->rx_left - words : 0; /* the hardware doesn't allow us to change fifo threshold * level while spi is enabled, so instead make sure to leave
The RXFLR is possible larger than rx_left in Rockchip SPI, fix it. Fixes: 01b59ce5dac8 ("spi: rockchip: use irq rather than polling") Signed-off-by: Jon Lin <jon.lin@rock-chips.com> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Emil Renner Berthing <kernel@esmil.dk> Tested-by: Emil Renner Berthing <kernel@esmil.dk> --- drivers/spi/spi-rockchip.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)