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authorHuibin Hong <huibin.hong@rock-chips.com>2016-02-24 13:00:04 +0300
committerMark Brown <broonie@kernel.org>2016-03-05 07:40:04 +0300
commitb920cc3191d7612f26f36ee494e05b5ffd9044c0 (patch)
treeca0b5c2888d272f365fca7733d1df8aad7e75c11 /drivers/spi/spi-rockchip.c
parent9b7a56221590cad777e56ec40afe7a6a68f9ac01 (diff)
downloadlinux-b920cc3191d7612f26f36ee494e05b5ffd9044c0.tar.xz
spi/rockchip: Make sure spi clk is on in rockchip_spi_set_cs
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>
Diffstat (limited to 'drivers/spi/spi-rockchip.c')
-rw-r--r--drivers/spi/spi-rockchip.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 07c082aa5cff..6cdb4d81d66c 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -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,