diff options
| author | Huibin Hong <huibin.hong@rock-chips.com> | 2016-02-24 18:00:04 +0800 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-07-10 23:07:12 -0400 |
| commit | 377e05c42b3078841377779f6f7f0f37b0ef31a2 (patch) | |
| tree | 8648f2722801e367a5fab3ce7b4a881f472d9cc1 /drivers | |
| parent | 25c871c07f37b8cbaebc97403233185479af095d (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>
Diffstat (limited to 'drivers')
| -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 68e7efeb9a27..1d308cba29b1 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -265,7 +265,10 @@ 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; @@ -290,6 +293,8 @@ 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, |