This is a note to let you know that I've just added the patch titled
spi/rockchip: Make sure spi clk is on in rockchip_spi_set_cs
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-rockchip-make-sure-spi-clk-is-on-in-rockchip_spi_set_cs.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b920cc3191d7612f26f36ee494e05b5ffd9044c0 Mon Sep 17 00:00:00 2001
From: Huibin Hong <huibin.hong@xxxxxxxxxxxxxx>
Date: Wed, 24 Feb 2016 18:00:04 +0800
Subject: spi/rockchip: Make sure spi clk is on in rockchip_spi_set_cs
From: Huibin Hong <huibin.hong@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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,
Patches currently in stable-queue which might be from huibin.hong@xxxxxxxxxxxxxx are
queue-4.4/spi-rockchip-make-sure-spi-clk-is-on-in-rockchip_spi_set_cs.patch
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