[PATCH 4.5 139/200] spi/rockchip: Make sure spi clk is on in rockchip_spi_set_cs

Greg Kroah-Hartman
2016-05-03T00:46:57Z

From: Huibin Hong <huibin.hong@rock-chips.com>

commit b920cc3191d7612f26f36ee494e05b5ffd9044c0 upstream.

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/spi/spi-rockchip.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -265,7 +265,10 @@ static inline u32 rx_max(struct rockchip
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 s
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,