[PATCH 0/3] Fix clock handling in rockchip spi suspend/resume/remove

[PATCH 0/3] Fix clock handling in rockchip spi suspend/resume/remove

[Jeffy Chen]

I saw unpaired spi clock disable warnings when suspend/unbind spi device.
Fix them follow spi-s3c64xx.c.



Jeffy Chen (3):
  spi: rockchip: Slightly rework return value handling
  spi: rockchip: Fix clock handling in remove
  spi: rockchip: Fix clock handling in suspend/resume

 drivers/spi/spi-rockchip.c | 51 +++++++++++++++++++++-------------------------
 1 file changed, 23 insertions(+), 28 deletions(-)

-- 
2.1.4

[PATCH 1/3] spi: rockchip: Slightly rework return value handling

[Jeffy Chen]

Slightly rework return value handling, no functional changes.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>

---

 drivers/spi/spi-rockchip.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 0b4a52b..5497650 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -666,7 +666,7 @@ static bool rockchip_spi_can_dma(struct spi_master *master,
 
 static int rockchip_spi_probe(struct platform_device *pdev)
 {
-	int ret = 0;
+	int ret;
 	struct rockchip_spi *rs;
 	struct spi_master *master;
 	struct resource *mem;
@@ -703,13 +703,13 @@ static int rockchip_spi_probe(struct platform_device *pdev)
 	}
 
 	ret = clk_prepare_enable(rs->apb_pclk);
-	if (ret) {
+	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to enable apb_pclk\n");
 		goto err_put_master;
 	}
 
 	ret = clk_prepare_enable(rs->spiclk);
-	if (ret) {
+	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to enable spi_clk\n");
 		goto err_disable_apbclk;
 	}
@@ -786,7 +786,7 @@ static int rockchip_spi_probe(struct platform_device *pdev)
 	}
 
 	ret = devm_spi_register_master(&pdev->dev, master);
-	if (ret) {
+	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to register master\n");
 		goto err_free_dma_rx;
 	}
@@ -834,12 +834,12 @@ static int rockchip_spi_remove(struct platform_device *pdev)
 #ifdef CONFIG_PM_SLEEP
 static int rockchip_spi_suspend(struct device *dev)
 {
-	int ret = 0;
+	int ret;
 	struct spi_master *master = dev_get_drvdata(dev);
 	struct rockchip_spi *rs = spi_master_get_devdata(master);
 
 	ret = spi_master_suspend(rs->master);
-	if (ret)
+	if (ret < 0)
 		return ret;
 
 	if (!pm_runtime_suspended(dev)) {
@@ -849,12 +849,12 @@ static int rockchip_spi_suspend(struct device *dev)
 
 	pinctrl_pm_select_sleep_state(dev);
 
-	return ret;
+	return 0;
 }
 
 static int rockchip_spi_resume(struct device *dev)
 {
-	int ret = 0;
+	int ret;
 	struct spi_master *master = dev_get_drvdata(dev);
 	struct rockchip_spi *rs = spi_master_get_devdata(master);
 
@@ -878,7 +878,7 @@ static int rockchip_spi_resume(struct device *dev)
 		clk_disable_unprepare(rs->apb_pclk);
 	}
 
-	return ret;
+	return 0;
 }
 #endif /* CONFIG_PM_SLEEP */
 
@@ -901,14 +901,14 @@ static int rockchip_spi_runtime_resume(struct device *dev)
 	struct rockchip_spi *rs = spi_master_get_devdata(master);
 
 	ret = clk_prepare_enable(rs->apb_pclk);
-	if (ret)
+	if (ret < 0)
 		return ret;
 
 	ret = clk_prepare_enable(rs->spiclk);
-	if (ret)
+	if (ret < 0)
 		clk_disable_unprepare(rs->apb_pclk);
 
-	return ret;
+	return 0;
 }
 #endif /* CONFIG_PM */
 
-- 
2.1.4

[PATCH 2/3] spi: rockchip: Fix clock handling in remove

[Jeffy Chen]

We are assuming clocks enabled when calling rockchip_spi_remove, which
is not always true. Those clocks might already been disabled by the
runtime PM at that time.

Call pm_runtime_get_sync before trying to disable clocks to avoid that.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
---

 drivers/spi/spi-rockchip.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 5497650..a75fd9b 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -816,11 +816,15 @@ static int rockchip_spi_remove(struct platform_device *pdev)
 	struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
 	struct rockchip_spi *rs = spi_master_get_devdata(master);
 
-	pm_runtime_disable(&pdev->dev);
+	pm_runtime_get_sync(&pdev->dev);
 
 	clk_disable_unprepare(rs->spiclk);
 	clk_disable_unprepare(rs->apb_pclk);
 
+	pm_runtime_put_noidle(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+	pm_runtime_set_suspended(&pdev->dev);
+
 	if (rs->dma_tx.ch)
 		dma_release_channel(rs->dma_tx.ch);
 	if (rs->dma_rx.ch)
-- 
2.1.4

[PATCH 3/3] spi: rockchip: Fix clock handling in suspend/resume

[Jeffy Chen]

The runtime suspend callback might be called by pm domain framework at
suspend_noirq stage. It would try to disable the clocks which already
been disabled by rockchip_spi_suspend.

Call pm_runtime_force_suspend/pm_runtime_force_resume when
suspend/resume to avoid that.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
---

 drivers/spi/spi-rockchip.c | 21 ++++++---------------
 1 file changed, 6 insertions(+), 15 deletions(-)

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index a75fd9b..34f6440 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -846,10 +846,9 @@ static int rockchip_spi_suspend(struct device *dev)
 	if (ret < 0)
 		return ret;
 
-	if (!pm_runtime_suspended(dev)) {
-		clk_disable_unprepare(rs->spiclk);
-		clk_disable_unprepare(rs->apb_pclk);
-	}
+	ret = pm_runtime_force_suspend(dev);
+	if (ret < 0)
+		return ret;
 
 	pinctrl_pm_select_sleep_state(dev);
 
@@ -864,17 +863,9 @@ static int rockchip_spi_resume(struct device *dev)
 
 	pinctrl_pm_select_default_state(dev);
 
-	if (!pm_runtime_suspended(dev)) {
-		ret = clk_prepare_enable(rs->apb_pclk);
-		if (ret < 0)
-			return ret;
-
-		ret = clk_prepare_enable(rs->spiclk);
-		if (ret < 0) {
-			clk_disable_unprepare(rs->apb_pclk);
-			return ret;
-		}
-	}
+	ret = pm_runtime_force_resume(dev);
+	if (ret < 0)
+		return ret;
 
 	ret = spi_master_resume(rs->master);
 	if (ret < 0) {
-- 
2.1.4

Applied "spi: rockchip: Fix clock handling in suspend/resume" to the spi tree

[Mark Brown]

The patch

   spi: rockchip: Fix clock handling in suspend/resume

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From d38c4ae194bb8a3d8cf7d95378c5b2799cdd0a3b Mon Sep 17 00:00:00 2001
From: Jeffy Chen <jeffy.chen@rock-chips.com>
Date: Mon, 7 Aug 2017 20:40:20 +0800
Subject: [PATCH] spi: rockchip: Fix clock handling in suspend/resume

The runtime suspend callback might be called by pm domain framework at
suspend_noirq stage. It would try to disable the clocks which already
been disabled by rockchip_spi_suspend.

Call pm_runtime_force_suspend/pm_runtime_force_resume when
suspend/resume to avoid that.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/spi/spi-rockchip.c | 21 ++++++---------------
 1 file changed, 6 insertions(+), 15 deletions(-)

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index a75fd9bb76de..34f6440a5255 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -846,10 +846,9 @@ static int rockchip_spi_suspend(struct device *dev)
 	if (ret < 0)
 		return ret;
 
-	if (!pm_runtime_suspended(dev)) {
-		clk_disable_unprepare(rs->spiclk);
-		clk_disable_unprepare(rs->apb_pclk);
-	}
+	ret = pm_runtime_force_suspend(dev);
+	if (ret < 0)
+		return ret;
 
 	pinctrl_pm_select_sleep_state(dev);
 
@@ -864,17 +863,9 @@ static int rockchip_spi_resume(struct device *dev)
 
 	pinctrl_pm_select_default_state(dev);
 
-	if (!pm_runtime_suspended(dev)) {
-		ret = clk_prepare_enable(rs->apb_pclk);
-		if (ret < 0)
-			return ret;
-
-		ret = clk_prepare_enable(rs->spiclk);
-		if (ret < 0) {
-			clk_disable_unprepare(rs->apb_pclk);
-			return ret;
-		}
-	}
+	ret = pm_runtime_force_resume(dev);
+	if (ret < 0)
+		return ret;
 
 	ret = spi_master_resume(rs->master);
 	if (ret < 0) {
-- 
2.13.3

Applied "spi: rockchip: Fix clock handling in remove" to the spi tree

[Mark Brown]

The patch

   spi: rockchip: Fix clock handling in remove

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 6a06e895b262621a81b3b08126b4bc5e1b8eef05 Mon Sep 17 00:00:00 2001
From: Jeffy Chen <jeffy.chen@rock-chips.com>
Date: Mon, 7 Aug 2017 20:40:19 +0800
Subject: [PATCH] spi: rockchip: Fix clock handling in remove

We are assuming clocks enabled when calling rockchip_spi_remove, which
is not always true. Those clocks might already been disabled by the
runtime PM at that time.

Call pm_runtime_get_sync before trying to disable clocks to avoid that.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/spi/spi-rockchip.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 5497650992c7..a75fd9bb76de 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -816,11 +816,15 @@ static int rockchip_spi_remove(struct platform_device *pdev)
 	struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
 	struct rockchip_spi *rs = spi_master_get_devdata(master);
 
-	pm_runtime_disable(&pdev->dev);
+	pm_runtime_get_sync(&pdev->dev);
 
 	clk_disable_unprepare(rs->spiclk);
 	clk_disable_unprepare(rs->apb_pclk);
 
+	pm_runtime_put_noidle(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+	pm_runtime_set_suspended(&pdev->dev);
+
 	if (rs->dma_tx.ch)
 		dma_release_channel(rs->dma_tx.ch);
 	if (rs->dma_rx.ch)
-- 
2.13.3

Applied "spi: rockchip: Slightly rework return value handling" to the spi tree

[Mark Brown]

The patch

   spi: rockchip: Slightly rework return value handling

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 43de979ddc099c57858b243619c66e2f663a2f97 Mon Sep 17 00:00:00 2001
From: Jeffy Chen <jeffy.chen@rock-chips.com>
Date: Mon, 7 Aug 2017 20:40:18 +0800
Subject: [PATCH] spi: rockchip: Slightly rework return value handling

Slightly rework return value handling, no functional changes.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/spi/spi-rockchip.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 0b4a52b3e1dc..5497650992c7 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -666,7 +666,7 @@ static bool rockchip_spi_can_dma(struct spi_master *master,
 
 static int rockchip_spi_probe(struct platform_device *pdev)
 {
-	int ret = 0;
+	int ret;
 	struct rockchip_spi *rs;
 	struct spi_master *master;
 	struct resource *mem;
@@ -703,13 +703,13 @@ static int rockchip_spi_probe(struct platform_device *pdev)
 	}
 
 	ret = clk_prepare_enable(rs->apb_pclk);
-	if (ret) {
+	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to enable apb_pclk\n");
 		goto err_put_master;
 	}
 
 	ret = clk_prepare_enable(rs->spiclk);
-	if (ret) {
+	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to enable spi_clk\n");
 		goto err_disable_apbclk;
 	}
@@ -786,7 +786,7 @@ static int rockchip_spi_probe(struct platform_device *pdev)
 	}
 
 	ret = devm_spi_register_master(&pdev->dev, master);
-	if (ret) {
+	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to register master\n");
 		goto err_free_dma_rx;
 	}
@@ -834,12 +834,12 @@ static int rockchip_spi_remove(struct platform_device *pdev)
 #ifdef CONFIG_PM_SLEEP
 static int rockchip_spi_suspend(struct device *dev)
 {
-	int ret = 0;
+	int ret;
 	struct spi_master *master = dev_get_drvdata(dev);
 	struct rockchip_spi *rs = spi_master_get_devdata(master);
 
 	ret = spi_master_suspend(rs->master);
-	if (ret)
+	if (ret < 0)
 		return ret;
 
 	if (!pm_runtime_suspended(dev)) {
@@ -849,12 +849,12 @@ static int rockchip_spi_suspend(struct device *dev)
 
 	pinctrl_pm_select_sleep_state(dev);
 
-	return ret;
+	return 0;
 }
 
 static int rockchip_spi_resume(struct device *dev)
 {
-	int ret = 0;
+	int ret;
 	struct spi_master *master = dev_get_drvdata(dev);
 	struct rockchip_spi *rs = spi_master_get_devdata(master);
 
@@ -878,7 +878,7 @@ static int rockchip_spi_resume(struct device *dev)
 		clk_disable_unprepare(rs->apb_pclk);
 	}
 
-	return ret;
+	return 0;
 }
 #endif /* CONFIG_PM_SLEEP */
 
@@ -901,14 +901,14 @@ static int rockchip_spi_runtime_resume(struct device *dev)
 	struct rockchip_spi *rs = spi_master_get_devdata(master);
 
 	ret = clk_prepare_enable(rs->apb_pclk);
-	if (ret)
+	if (ret < 0)
 		return ret;
 
 	ret = clk_prepare_enable(rs->spiclk);
-	if (ret)
+	if (ret < 0)
 		clk_disable_unprepare(rs->apb_pclk);
 
-	return ret;
+	return 0;
 }
 #endif /* CONFIG_PM */
 
-- 
2.13.3