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spi/rockchip: Make sure spi clk is on in rockchip_spi_set_cs

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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: 64e36824b3 ("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>
This commit is contained in:
Huibin Hong 2016-02-24 18:00:04 +08:00 committed by Mark Brown
parent 9b7a562215
commit b920cc3191
1 changed files with 6 additions and 1 deletions
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7
drivers/spi/spi-rockchip.c
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@ -263,7 +263,10 @@ 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;
@ -288,6 +291,8 @@ 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,