From: Huibin Hong <huibin.hong@xxxxxxxxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit b920cc3191d7612f26f36ee494e05b5ffd9044c0 ]
Rockchip_spi_set_cs could be called by spi_setup, but
spi_setup may be called by device driver after runtime suspend.
Then the spi clock is closed, rockchip_spi_set_cs may access the
spi registers, which causes cpu block in some socs.
Fixes: 64e36824b32 ("spi/rockchip: add driver for Rockchip RK3xxx")
Signed-off-by: Huibin Hong <huibin.hong@xxxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
drivers/spi/spi-rockchip.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 87bc16f..4703aeb 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -264,7 +264,10 @@ static inline u32 rx_max(struct rockchip_spi *rs)
static void rockchip_spi_set_cs(struct spi_device *spi, bool enable)
{
u32 ser;
- struct rockchip_spi *rs = spi_master_get_devdata(spi->master);
+ struct spi_master *master = spi->master;
+ struct rockchip_spi *rs = spi_master_get_devdata(master);
+
+ pm_runtime_get_sync(rs->dev);
ser = readl_relaxed(rs->regs + ROCKCHIP_SPI_SER) & SER_MASK;
@@ -289,6 +292,8 @@ static void rockchip_spi_set_cs(struct spi_device *spi, bool enable)
ser &= ~(1 << spi->chip_select);
writel_relaxed(ser, rs->regs + ROCKCHIP_SPI_SER);
+
+ pm_runtime_put_sync(rs->dev);
}
static int rockchip_spi_prepare_message(struct spi_master *master,
--
2.5.0
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