linux-kernel - [PATCH] spi/rockchip: Make sure spi clk is on in rockchip_spi_set

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Message-Id: <1456308004-29102-1-git-send-email-huibin.hong@rock-chips.com>
Date:	Wed, 24 Feb 2016 18:00:04 +0800
From:	Huibin Hong <huibin.hong@...k-chips.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	linux-spi@...r.kernel.org, linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Huibin Hong <huibin.hong@...k-chips.com>,
	Addy Ke <addy.ke@...kchip.com>,
	"shawn.lin" <shawn.lin@...nel-upstream.org>
Subject: [PATCH] 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")
Cc: Addy Ke <addy.ke@...kchip.com>
Cc: shawn.lin <shawn.lin@...nel-upstream.org>
Signed-off-by: Huibin Hong <huibin.hong@...k-chips.com>
---

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

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 79a8bc4..035767c 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,
--
1.9.1