[PATCH AUTOSEL 5.15 19/41] spi: rockchip: Unmask IRQ at the final to avoid preemption

Sasha Levin
2022-06-28T02:23:42Z

From: Jon Lin <jon.lin@rock-chips.com>

[ Upstream commit 419bc8f681a0dc63588cee693b6d45e7caa6006c ]

Avoid pio_write process is preempted, resulting in abnormal state.

Signed-off-by: Jon Lin <jon.lin@rock-chips.com>
Signed-off-by: Jon <jon.lin@rock-chips.com>
Link: https://lore.kernel.org/r/20220617124251.5051-1-jon.lin@rock-chips.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/spi/spi-rockchip.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index b721b62118e1..7880a4f25284 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -380,15 +380,18 @@ static int rockchip_spi_prepare_irq(struct rockchip_spi *rs,
rs->tx_left = rs->tx ? xfer->len / rs->n_bytes : 0;
rs->rx_left = xfer->len / rs->n_bytes;

- if (rs->cs_inactive)
- writel_relaxed(INT_RF_FULL | INT_CS_INACTIVE, rs->regs + ROCKCHIP_SPI_IMR);
- else
- writel_relaxed(INT_RF_FULL, rs->regs + ROCKCHIP_SPI_IMR);
+ writel_relaxed(0xffffffff, rs->regs + ROCKCHIP_SPI_ICR);
+
spi_enable_chip(rs, true);

if (rs->tx_left)
rockchip_spi_pio_writer(rs);

+ if (rs->cs_inactive)
+ writel_relaxed(INT_RF_FULL | INT_CS_INACTIVE, rs->regs + ROCKCHIP_SPI_IMR);
+ else
+ writel_relaxed(INT_RF_FULL, rs->regs + ROCKCHIP_SPI_IMR);
+
/* 1 means the transfer is in progress */
return 1;
}
--
2.35.1