[PATCH 1/2] spi/s3c64xx: Do not ignore return value of spi_master_resume/suspend

[PATCH 1/2] spi/s3c64xx: Do not ignore return value of spi_master_resume/suspend

[Krzysztof Kozlowski]

During PM resume and suspend do not ignore the return value of
spi_master_suspend() or spi_master_resume(). Instead pass it further.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 drivers/spi/spi-s3c64xx.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 512b889..59f4fd9 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -1480,7 +1480,9 @@ static int s3c64xx_spi_suspend(struct device *dev)
 	struct spi_master *master = dev_get_drvdata(dev);
 	struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
 
-	spi_master_suspend(master);
+	int ret = spi_master_suspend(master);
+	if (ret)
+		return ret;
 
 	/* Disable the clock */
 	clk_disable_unprepare(sdd->src_clk);
@@ -1506,9 +1508,7 @@ static int s3c64xx_spi_resume(struct device *dev)
 
 	s3c64xx_spi_hwinit(sdd, sdd->port_id);
 
-	spi_master_resume(master);
-
-	return 0;
+	return spi_master_resume(master);
 }
 #endif /* CONFIG_PM_SLEEP */
 
-- 
1.7.9.5

[PATCH 2/2] spi/s3c64xx: Fix doubled clock disable on suspend

[Krzysztof Kozlowski]

Fix doubled clock disable and unprepare during PM suspend which triggered
the warnings:

WARNING: at drivers/clk/clk.c:800 clk_disable+0x18/0x24()
Modules linked in:
CPU: 0 PID: 1745 Comm: sh Not tainted 3.10.14-01211-ge2549bb-dirty #62
[<c0015980>] (unwind_backtrace+0x0/0x138) from [<c0012a44>] (show_stack+0x10/0x14)
[<c0012a44>] (show_stack+0x10/0x14) from [<c0022818>] (warn_slowpath_common+0x4c/0x68)
[<c0022818>] (warn_slowpath_common+0x4c/0x68) from [<c0022850>] (warn_slowpath_null+0x1c/0x24)
[<c0022850>] (warn_slowpath_null+0x1c/0x24) from [<c036e274>] (clk_disable+0x18/0x24)
[<c036e274>] (clk_disable+0x18/0x24) from [<c02d5f78>] (s3c64xx_spi_suspend+0x28/0x54)
[<c02d5f78>] (s3c64xx_spi_suspend+0x28/0x54) from [<c02b3a54>] (platform_pm_suspend+0x2c/0x5c)
[<c02b3a54>] (platform_pm_suspend+0x2c/0x5c) from [<c02b8a30>] (dpm_run_callback+0x44/0x7c)
[<c02b8a30>] (dpm_run_callback+0x44/0x7c) from [<c02b8b70>] (__device_suspend+0x108/0x300)
[<c02b8b70>] (__device_suspend+0x108/0x300) from [<c02ba4e0>] (dpm_suspend+0x54/0x208)
[<c02ba4e0>] (dpm_suspend+0x54/0x208) from [<c0066bcc>] (suspend_devices_and_enter+0x98/0x458)
[<c0066bcc>] (suspend_devices_and_enter+0x98/0x458) from [<c0067150>] (pm_suspend+0x1c4/0x25c)
[<c0067150>] (pm_suspend+0x1c4/0x25c) from [<c0066044>] (state_store+0x6c/0xbc)
[<c0066044>] (state_store+0x6c/0xbc) from [<c0203290>] (kobj_attr_store+0x14/0x20)
[<c0203290>] (kobj_attr_store+0x14/0x20) from [<c0157530>] (sysfs_write_file+0xfc/0x164)
[<c0157530>] (sysfs_write_file+0xfc/0x164) from [<c00fd6b0>] (vfs_write+0xbc/0x1bc)
[<c00fd6b0>] (vfs_write+0xbc/0x1bc) from [<c00fdaf0>] (SyS_write+0x40/0x68)
[<c00fdaf0>] (SyS_write+0x40/0x68) from [<c000ea80>] (ret_fast_syscall+0x0/0x3c)

The clocks may be already disabled before suspending. Check PM runtime
suspend status and disable clocks only if device is not suspended.
During resume do not enable the clocks if device is runtime suspended.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 drivers/spi/spi-s3c64xx.c |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 59f4fd9..8953178 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -1484,9 +1484,10 @@ static int s3c64xx_spi_suspend(struct device *dev)
 	if (ret)
 		return ret;
 
-	/* Disable the clock */
-	clk_disable_unprepare(sdd->src_clk);
-	clk_disable_unprepare(sdd->clk);
+	if (!pm_runtime_suspended(dev)) {
+		clk_disable_unprepare(sdd->clk);
+		clk_disable_unprepare(sdd->src_clk);
+	}
 
 	sdd->cur_speed = 0; /* Output Clock is stopped */
 
@@ -1502,9 +1503,10 @@ static int s3c64xx_spi_resume(struct device *dev)
 	if (sci->cfg_gpio)
 		sci->cfg_gpio();
 
-	/* Enable the clock */
-	clk_prepare_enable(sdd->src_clk);
-	clk_prepare_enable(sdd->clk);
+	if (!pm_runtime_suspended(dev)) {
+		clk_prepare_enable(sdd->src_clk);
+		clk_prepare_enable(sdd->clk);
+	}
 
 	s3c64xx_spi_hwinit(sdd, sdd->port_id);
 
-- 
1.7.9.5

Re: [PATCH 2/2] spi/s3c64xx: Fix doubled clock disable on suspend

[Sylwester Nawrocki]

On 21/10/13 15:42, Krzysztof Kozlowski wrote:
> Fix doubled clock disable and unprepare during PM suspend which triggered
> the warnings:

> The clocks may be already disabled before suspending. Check PM runtime
> suspend status and disable clocks only if device is not suspended.
> During resume do not enable the clocks if device is runtime suspended.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>

Re: [PATCH 1/2] spi/s3c64xx: Do not ignore return value of spi_master_resume/suspend

[Sylwester Nawrocki]

On 21/10/13 15:42, Krzysztof Kozlowski wrote:
> During PM resume and suspend do not ignore the return value of
> spi_master_suspend() or spi_master_resume(). Instead pass it further.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>

Re: [PATCH 1/2] spi/s3c64xx: Do not ignore return value of spi_master_resume/suspend

[Mark Brown]

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On Mon, Oct 21, 2013 at 03:42:49PM +0200, Krzysztof Kozlowski wrote:
> During PM resume and suspend do not ignore the return value of
> spi_master_suspend() or spi_master_resume(). Instead pass it further.

Applied both, thanks.

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