Messages in this thread Patch in this message | | | From | Jon Lin <> | Subject | [PATCH v1 3/3] spi: rockchip: Fix error in SPI slave pio read | Date | Wed, 22 Jul 2020 14:52:57 +0800 |
| |
The RXFLR is possible larger than rx_left in Rockchip SPI, fix it.
Signed-off-by: Jon Lin <jon.lin@rock-chips.com> --- drivers/spi/spi-rockchip.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index a451dacab5cf..1f5e613b67d9 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 -- 2.17.1
| |