diff options
| author | Huibin Hong <huibin.hong@rock-chips.com> | 2016-02-24 18:00:04 +0800 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-07-12 08:47:51 -0400 |
| commit | a18f931caecd86f0003afe1076238970dbdd0235 (patch) | |
| tree | 8f71b6f23d96990bfb1ef90c99c08f0b1aabe43b | |
| parent | 9a71843e3ab0f1ffb766c4074f761ba57e3c12c8 (diff) | |
spi/rockchip: Make sure spi clk is on in rockchip_spi_set_cs
[ 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@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
| -rw-r--r-- | drivers/spi/spi-rockchip.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index 87bc16f491f0..4703aeb7c25d 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, |