[PATCH v2 0/3] ARM: dts: keystone-k2g: Add I2C support for 66AK2G

[PATCH v2 0/3] ARM: dts: keystone-k2g: Add I2C support for 66AK2G

[Franklin S Cooper Jr]

Add I2C support to 66AK2G. Primary requirement is to add PM
Runtime support to the driver.

This has been tested on following platforms by performing simple i2c test
such as i2c detect and reading on board i2c devices:
K2G GP evm
OMAPL138
K2L GP EVM

and boot tested on:
K2E GP EVM
K2HK GP EVM

Version 2 changes:
Moved ordering of pm runtime calls

Franklin S Cooper Jr (3):
  i2c: davinci: Preserve return value of devm_clk_get
  i2c: davinci: Add PM Runtime Support
  dt-bindings: i2c: i2c-davinci: Update binding for 66AK2Gx pwr dm
    property

 .../devicetree/bindings/i2c/i2c-davinci.txt        | 12 ++++
 drivers/i2c/busses/i2c-davinci.c                   | 64 +++++++++++++++++++---
 2 files changed, 67 insertions(+), 9 deletions(-)

-- 
2.9.4.dirty

[PATCH v2 1/3] i2c: davinci: Preserve return value of devm_clk_get

[Franklin S Cooper Jr]

The i2c driver can run into driver dependency issues if its loaded
before a clock driver it depends on. Therefore, EPROBE_DEFER may be
returned by devm_clk_get and should be returned in probe to allow the
kernel to reprobe the driver at a later time. This patch allows the error
value returned by devm_clk_get to be passed through and not overwritten.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
 drivers/i2c/busses/i2c-davinci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
index 33ca9a3..b8c4353 100644
--- a/drivers/i2c/busses/i2c-davinci.c
+++ b/drivers/i2c/busses/i2c-davinci.c
@@ -801,7 +801,7 @@ static int davinci_i2c_probe(struct platform_device *pdev)
 
 	dev->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(dev->clk))
-		return -ENODEV;
+		return PTR_ERR(dev->clk);
 	clk_prepare_enable(dev->clk);
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-- 
2.9.4.dirty

[PATCH v2 2/3] i2c: davinci: Add PM Runtime Support

[Franklin S Cooper Jr]

66AK2G has I2C instances that are not apart of the ALWAYS_ON power domain
like other Keystone 2 SoCs and OMAPL138. Therefore, pm_runtime
is required to insure the power domain used by the specific I2C instance is
properly turned on along with its functional clock.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
---
Version 2 changes:
Move initial calls to pm runtime autosuspend before pm_runtime_enable

 drivers/i2c/busses/i2c-davinci.c | 62 ++++++++++++++++++++++++++++++++++------
 1 file changed, 54 insertions(+), 8 deletions(-)

diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
index b8c4353..6b1930d 100644
--- a/drivers/i2c/busses/i2c-davinci.c
+++ b/drivers/i2c/busses/i2c-davinci.c
@@ -36,6 +36,7 @@
 #include <linux/gpio.h>
 #include <linux/of_device.h>
 #include <linux/platform_data/i2c-davinci.h>
+#include <linux/pm_runtime.h>
 
 /* ----- global defines ----------------------------------------------- */
 
@@ -122,6 +123,9 @@
 /* set the SDA GPIO low */
 #define DAVINCI_I2C_DCLR_PDCLR1	BIT(1)
 
+/* timeout for pm runtime autosuspend */
+#define DAVINCI_I2C_PM_TIMEOUT	1000	/* ms */
+
 struct davinci_i2c_dev {
 	struct device           *dev;
 	void __iomem		*base;
@@ -541,10 +545,17 @@ i2c_davinci_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 
 	dev_dbg(dev->dev, "%s: msgs: %d\n", __func__, num);
 
+	ret = pm_runtime_get_sync(dev->dev);
+	if (ret < 0) {
+		dev_err(dev->dev, "Failed to runtime_get device: %d\n", ret);
+		pm_runtime_put_noidle(dev->dev);
+		return ret;
+	}
+
 	ret = i2c_davinci_wait_bus_not_busy(dev);
 	if (ret < 0) {
 		dev_warn(dev->dev, "timeout waiting for bus ready\n");
-		return ret;
+		goto out;
 	}
 
 	for (i = 0; i < num; i++) {
@@ -552,14 +563,19 @@ i2c_davinci_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 		dev_dbg(dev->dev, "%s [%d/%d] ret: %d\n", __func__, i + 1, num,
 			ret);
 		if (ret < 0)
-			return ret;
+			goto out;
 	}
 
+	ret = num;
 #ifdef CONFIG_CPU_FREQ
 	complete(&dev->xfr_complete);
 #endif
 
-	return num;
+out:
+	pm_runtime_mark_last_busy(dev->dev);
+	pm_runtime_put_autosuspend(dev->dev);
+
+	return ret;
 }
 
 static u32 i2c_davinci_func(struct i2c_adapter *adap)
@@ -599,6 +615,9 @@ static irqreturn_t i2c_davinci_isr(int this_irq, void *dev_id)
 	int count = 0;
 	u16 w;
 
+	if (pm_runtime_suspended(dev->dev))
+		return IRQ_NONE;
+
 	while ((stat = davinci_i2c_read_reg(dev, DAVINCI_I2C_IVR_REG))) {
 		dev_dbg(dev->dev, "%s: stat=0x%x\n", __func__, stat);
 		if (count++ == 100) {
@@ -802,7 +821,6 @@ static int davinci_i2c_probe(struct platform_device *pdev)
 	dev->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(dev->clk))
 		return PTR_ERR(dev->clk);
-	clk_prepare_enable(dev->clk);
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	dev->base = devm_ioremap_resource(&pdev->dev, mem);
@@ -811,6 +829,18 @@ static int davinci_i2c_probe(struct platform_device *pdev)
 		goto err_unuse_clocks;
 	}
 
+	pm_runtime_set_autosuspend_delay(dev->dev,
+					 DAVINCI_I2C_PM_TIMEOUT);
+	pm_runtime_use_autosuspend(dev->dev);
+
+	pm_runtime_enable(dev->dev);
+
+	r = pm_runtime_get_sync(dev->dev);
+	if (r < 0) {
+		dev_err(dev->dev, "failed to runtime_get device: %d\n", r);
+		goto err_unuse_clocks;
+	}
+
 	i2c_davinci_init(dev);
 
 	r = devm_request_irq(&pdev->dev, dev->irq, i2c_davinci_isr, 0,
@@ -849,10 +879,16 @@ static int davinci_i2c_probe(struct platform_device *pdev)
 	if (r)
 		goto err_unuse_clocks;
 
+	pm_runtime_mark_last_busy(dev->dev);
+	pm_runtime_put_autosuspend(dev->dev);
+
 	return 0;
 
 err_unuse_clocks:
-	clk_disable_unprepare(dev->clk);
+	pm_runtime_dont_use_autosuspend(dev->dev);
+	pm_runtime_put_sync(dev->dev);
+	pm_runtime_disable(dev->dev);
+
 	dev->clk = NULL;
 	return r;
 }
@@ -860,16 +896,26 @@ static int davinci_i2c_probe(struct platform_device *pdev)
 static int davinci_i2c_remove(struct platform_device *pdev)
 {
 	struct davinci_i2c_dev *dev = platform_get_drvdata(pdev);
+	int ret;
 
 	i2c_davinci_cpufreq_deregister(dev);
 
 	i2c_del_adapter(&dev->adapter);
 
-	clk_disable_unprepare(dev->clk);
+	ret = pm_runtime_get_sync(&pdev->dev);
+	if (ret < 0) {
+		pm_runtime_put_noidle(&pdev->dev);
+		return ret;
+	}
+
 	dev->clk = NULL;
 
 	davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, 0);
 
+	pm_runtime_dont_use_autosuspend(dev->dev);
+	pm_runtime_put_sync(dev->dev);
+	pm_runtime_disable(dev->dev);
+
 	return 0;
 }
 
@@ -880,7 +926,6 @@ static int davinci_i2c_suspend(struct device *dev)
 
 	/* put I2C into reset */
 	davinci_i2c_reset_ctrl(i2c_dev, 0);
-	clk_disable_unprepare(i2c_dev->clk);
 
 	return 0;
 }
@@ -889,7 +934,6 @@ static int davinci_i2c_resume(struct device *dev)
 {
 	struct davinci_i2c_dev *i2c_dev = dev_get_drvdata(dev);
 
-	clk_prepare_enable(i2c_dev->clk);
 	/* take I2C out of reset */
 	davinci_i2c_reset_ctrl(i2c_dev, 1);
 
@@ -899,6 +943,8 @@ static int davinci_i2c_resume(struct device *dev)
 static const struct dev_pm_ops davinci_i2c_pm = {
 	.suspend        = davinci_i2c_suspend,
 	.resume         = davinci_i2c_resume,
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				      pm_runtime_force_resume)
 };
 
 #define davinci_i2c_pm_ops (&davinci_i2c_pm)
-- 
2.9.4.dirty

[PATCH v2 3/3] dt-bindings: i2c: i2c-davinci: Update binding for 66AK2Gx pwr dm property

[Franklin S Cooper Jr]

Add pm-domains property which is required for 66AK2Gx. Also document 66AK2G
unique clocks property usage.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
---
 Documentation/devicetree/bindings/i2c/i2c-davinci.txt | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/i2c-davinci.txt b/Documentation/devicetree/bindings/i2c/i2c-davinci.txt
index 5b123e0..64e6e65 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-davinci.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-davinci.txt
@@ -6,6 +6,18 @@ davinci/keystone i2c interface contains.
 Required properties:
 - compatible: "ti,davinci-i2c" or "ti,keystone-i2c";
 - reg : Offset and length of the register set for the device
+- clocks: I2C functional clock phandle.
+	  For 66AK2G this property should be set per binding,
+	  Documentation/devicetree/bindings/clock/ti,sci-clk.txt
+
+SoC-specific Required Properties:
+
+The following are mandatory properties for Keystone 2 66AK2G SoCs only:
+
+- power-domains:	Should contain a phandle to a PM domain provider node
+			and an args specifier containing the I2C device id
+			value. This property is as per the binding,
+			Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt
 
 Recommended properties :
 - interrupts : standard interrupt property.
-- 
2.9.4.dirty

Re: [PATCH v2 2/3] i2c: davinci: Add PM Runtime Support

[Wolfram Sang]

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On Wed, Aug 16, 2017 at 05:17:14PM -0500, Franklin S Cooper Jr wrote:
> 66AK2G has I2C instances that are not apart of the ALWAYS_ON power domain
> like other Keystone 2 SoCs and OMAPL138. Therefore, pm_runtime
> is required to insure the power domain used by the specific I2C instance is
> properly turned on along with its functional clock.
> 
> Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>

I'd need a review from the driver maintainers here. Which are Sekhar
Nori and Kevin Hilman(?) according to MAINTAINERS. Is that still
correct?

> ---
> Version 2 changes:
> Move initial calls to pm runtime autosuspend before pm_runtime_enable
> 
>  drivers/i2c/busses/i2c-davinci.c | 62 ++++++++++++++++++++++++++++++++++------
>  1 file changed, 54 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
> index b8c4353..6b1930d 100644
> --- a/drivers/i2c/busses/i2c-davinci.c
> +++ b/drivers/i2c/busses/i2c-davinci.c
> @@ -36,6 +36,7 @@
>  #include <linux/gpio.h>
>  #include <linux/of_device.h>
>  #include <linux/platform_data/i2c-davinci.h>
> +#include <linux/pm_runtime.h>
>  
>  /* ----- global defines ----------------------------------------------- */
>  
> @@ -122,6 +123,9 @@
>  /* set the SDA GPIO low */
>  #define DAVINCI_I2C_DCLR_PDCLR1	BIT(1)
>  
> +/* timeout for pm runtime autosuspend */
> +#define DAVINCI_I2C_PM_TIMEOUT	1000	/* ms */
> +
>  struct davinci_i2c_dev {
>  	struct device           *dev;
>  	void __iomem		*base;
> @@ -541,10 +545,17 @@ i2c_davinci_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
>  
>  	dev_dbg(dev->dev, "%s: msgs: %d\n", __func__, num);
>  
> +	ret = pm_runtime_get_sync(dev->dev);
> +	if (ret < 0) {
> +		dev_err(dev->dev, "Failed to runtime_get device: %d\n", ret);
> +		pm_runtime_put_noidle(dev->dev);
> +		return ret;
> +	}
> +
>  	ret = i2c_davinci_wait_bus_not_busy(dev);
>  	if (ret < 0) {
>  		dev_warn(dev->dev, "timeout waiting for bus ready\n");
> -		return ret;
> +		goto out;
>  	}
>  
>  	for (i = 0; i < num; i++) {
> @@ -552,14 +563,19 @@ i2c_davinci_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
>  		dev_dbg(dev->dev, "%s [%d/%d] ret: %d\n", __func__, i + 1, num,
>  			ret);
>  		if (ret < 0)
> -			return ret;
> +			goto out;
>  	}
>  
> +	ret = num;
>  #ifdef CONFIG_CPU_FREQ
>  	complete(&dev->xfr_complete);
>  #endif
>  
> -	return num;
> +out:
> +	pm_runtime_mark_last_busy(dev->dev);
> +	pm_runtime_put_autosuspend(dev->dev);
> +
> +	return ret;
>  }
>  
>  static u32 i2c_davinci_func(struct i2c_adapter *adap)
> @@ -599,6 +615,9 @@ static irqreturn_t i2c_davinci_isr(int this_irq, void *dev_id)
>  	int count = 0;
>  	u16 w;
>  
> +	if (pm_runtime_suspended(dev->dev))
> +		return IRQ_NONE;
> +
>  	while ((stat = davinci_i2c_read_reg(dev, DAVINCI_I2C_IVR_REG))) {
>  		dev_dbg(dev->dev, "%s: stat=0x%x\n", __func__, stat);
>  		if (count++ == 100) {
> @@ -802,7 +821,6 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>  	dev->clk = devm_clk_get(&pdev->dev, NULL);
>  	if (IS_ERR(dev->clk))
>  		return PTR_ERR(dev->clk);
> -	clk_prepare_enable(dev->clk);
>  
>  	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	dev->base = devm_ioremap_resource(&pdev->dev, mem);
> @@ -811,6 +829,18 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>  		goto err_unuse_clocks;
>  	}
>  
> +	pm_runtime_set_autosuspend_delay(dev->dev,
> +					 DAVINCI_I2C_PM_TIMEOUT);
> +	pm_runtime_use_autosuspend(dev->dev);
> +
> +	pm_runtime_enable(dev->dev);
> +
> +	r = pm_runtime_get_sync(dev->dev);
> +	if (r < 0) {
> +		dev_err(dev->dev, "failed to runtime_get device: %d\n", r);
> +		goto err_unuse_clocks;
> +	}
> +
>  	i2c_davinci_init(dev);
>  
>  	r = devm_request_irq(&pdev->dev, dev->irq, i2c_davinci_isr, 0,
> @@ -849,10 +879,16 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>  	if (r)
>  		goto err_unuse_clocks;
>  
> +	pm_runtime_mark_last_busy(dev->dev);
> +	pm_runtime_put_autosuspend(dev->dev);
> +
>  	return 0;
>  
>  err_unuse_clocks:
> -	clk_disable_unprepare(dev->clk);
> +	pm_runtime_dont_use_autosuspend(dev->dev);
> +	pm_runtime_put_sync(dev->dev);
> +	pm_runtime_disable(dev->dev);
> +
>  	dev->clk = NULL;
>  	return r;
>  }
> @@ -860,16 +896,26 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>  static int davinci_i2c_remove(struct platform_device *pdev)
>  {
>  	struct davinci_i2c_dev *dev = platform_get_drvdata(pdev);
> +	int ret;
>  
>  	i2c_davinci_cpufreq_deregister(dev);
>  
>  	i2c_del_adapter(&dev->adapter);
>  
> -	clk_disable_unprepare(dev->clk);
> +	ret = pm_runtime_get_sync(&pdev->dev);
> +	if (ret < 0) {
> +		pm_runtime_put_noidle(&pdev->dev);
> +		return ret;
> +	}
> +
>  	dev->clk = NULL;
>  
>  	davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, 0);
>  
> +	pm_runtime_dont_use_autosuspend(dev->dev);
> +	pm_runtime_put_sync(dev->dev);
> +	pm_runtime_disable(dev->dev);
> +
>  	return 0;
>  }
>  
> @@ -880,7 +926,6 @@ static int davinci_i2c_suspend(struct device *dev)
>  
>  	/* put I2C into reset */
>  	davinci_i2c_reset_ctrl(i2c_dev, 0);
> -	clk_disable_unprepare(i2c_dev->clk);
>  
>  	return 0;
>  }
> @@ -889,7 +934,6 @@ static int davinci_i2c_resume(struct device *dev)
>  {
>  	struct davinci_i2c_dev *i2c_dev = dev_get_drvdata(dev);
>  
> -	clk_prepare_enable(i2c_dev->clk);
>  	/* take I2C out of reset */
>  	davinci_i2c_reset_ctrl(i2c_dev, 1);
>  
> @@ -899,6 +943,8 @@ static int davinci_i2c_resume(struct device *dev)
>  static const struct dev_pm_ops davinci_i2c_pm = {
>  	.suspend        = davinci_i2c_suspend,
>  	.resume         = davinci_i2c_resume,
> +	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> +				      pm_runtime_force_resume)
>  };
>  
>  #define davinci_i2c_pm_ops (&davinci_i2c_pm)
> -- 
> 2.9.4.dirty
> 

[-- Attachment #2: signature.asc --]
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Re: [PATCH v2 2/3] i2c: davinci: Add PM Runtime Support

[Sekhar Nori]

On Thursday 17 August 2017 03:47 AM, Franklin S Cooper Jr wrote:

> @@ -802,7 +821,6 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>  	dev->clk = devm_clk_get(&pdev->dev, NULL);
>  	if (IS_ERR(dev->clk))
>  		return PTR_ERR(dev->clk);
> -	clk_prepare_enable(dev->clk);
>  
>  	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	dev->base = devm_ioremap_resource(&pdev->dev, mem);
> @@ -811,6 +829,18 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>  		goto err_unuse_clocks;

This goto is wrong now. There is no need to unwind the pm_runtime setup
on a devm_ioremap_resource() failure. You can just return error here.

>  	}
>  
> +	pm_runtime_set_autosuspend_delay(dev->dev,
> +					 DAVINCI_I2C_PM_TIMEOUT);
> +	pm_runtime_use_autosuspend(dev->dev);
> +
> +	pm_runtime_enable(dev->dev);
> +
> +	r = pm_runtime_get_sync(dev->dev);
> +	if (r < 0) {
> +		dev_err(dev->dev, "failed to runtime_get device: %d\n", r);
> +		goto err_unuse_clocks;
> +	}
> +
>  	i2c_davinci_init(dev);
>  
>  	r = devm_request_irq(&pdev->dev, dev->irq, i2c_davinci_isr, 0,
> @@ -849,10 +879,16 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>  	if (r)
>  		goto err_unuse_clocks;
>  
> +	pm_runtime_mark_last_busy(dev->dev);
> +	pm_runtime_put_autosuspend(dev->dev);
> +
>  	return 0;
>  
>  err_unuse_clocks:
> -	clk_disable_unprepare(dev->clk);
> +	pm_runtime_dont_use_autosuspend(dev->dev);
> +	pm_runtime_put_sync(dev->dev);
> +	pm_runtime_disable(dev->dev);
> +
>  	dev->clk = NULL;

This null setting of clk seems quite bogus and can be cleaned-up.

>  	return r;
>  }

Thanks,
Sekhar

Re: [PATCH v2 2/3] i2c: davinci: Add PM Runtime Support

[Sekhar Nori]

Hi Wolfram,

On Thursday 17 August 2017 09:54 PM, Wolfram Sang wrote:
> On Wed, Aug 16, 2017 at 05:17:14PM -0500, Franklin S Cooper Jr wrote:
>> 66AK2G has I2C instances that are not apart of the ALWAYS_ON power domain
>> like other Keystone 2 SoCs and OMAPL138. Therefore, pm_runtime
>> is required to insure the power domain used by the specific I2C instance is
>> properly turned on along with its functional clock.
>>
>> Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
> 
> I'd need a review from the driver maintainers here. Which are Sekhar
> Nori and Kevin Hilman(?) according to MAINTAINERS. Is that still
> correct?

I just finished the review (sent the comments). Thanks for the reminder!

Also, tested the patches using i2cdetect and suspend/resume on OMAP-L138
LCDK board.

Regards,
Sekhar

Re: [PATCH v2 1/3] i2c: davinci: Preserve return value of devm_clk_get

[Sekhar Nori]

On Thursday 17 August 2017 03:47 AM, Franklin S Cooper Jr wrote:
> The i2c driver can run into driver dependency issues if its loaded
> before a clock driver it depends on. Therefore, EPROBE_DEFER may be
> returned by devm_clk_get and should be returned in probe to allow the
> kernel to reprobe the driver at a later time. This patch allows the error
> value returned by devm_clk_get to be passed through and not overwritten.
> 
> Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
> Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>

Acked-by: Sekhar Nori <nsekhar@ti.com>

Thanks,
Sekhar

Re: [PATCH v2 3/3] dt-bindings: i2c: i2c-davinci: Update binding for 66AK2Gx pwr dm property

[Sekhar Nori]

On Thursday 17 August 2017 03:47 AM, Franklin S Cooper Jr wrote:
> Add pm-domains property which is required for 66AK2Gx. Also document 66AK2G
> unique clocks property usage.
> 
> Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
> Acked-by: Rob Herring <robh@kernel.org>

Acked-by: Sekhar Nori <nsekhar@ti.com>

Thanks,
Sekhar

Re: [PATCH v2 2/3] i2c: davinci: Add PM Runtime Support

[Franklin S Cooper Jr]

On 08/21/2017 04:05 AM, Sekhar Nori wrote:
> On Thursday 17 August 2017 03:47 AM, Franklin S Cooper Jr wrote:
> 
>> @@ -802,7 +821,6 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>>  	dev->clk = devm_clk_get(&pdev->dev, NULL);
>>  	if (IS_ERR(dev->clk))
>>  		return PTR_ERR(dev->clk);
>> -	clk_prepare_enable(dev->clk);
>>  
>>  	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>  	dev->base = devm_ioremap_resource(&pdev->dev, mem);
>> @@ -811,6 +829,18 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>>  		goto err_unuse_clocks;
> 
> This goto is wrong now. There is no need to unwind the pm_runtime setup
> on a devm_ioremap_resource() failure. You can just return error here.

Ok
> 
>>  	}
>>  
>> +	pm_runtime_set_autosuspend_delay(dev->dev,
>> +					 DAVINCI_I2C_PM_TIMEOUT);
>> +	pm_runtime_use_autosuspend(dev->dev);
>> +
>> +	pm_runtime_enable(dev->dev);
>> +
>> +	r = pm_runtime_get_sync(dev->dev);
>> +	if (r < 0) {
>> +		dev_err(dev->dev, "failed to runtime_get device: %d\n", r);
>> +		goto err_unuse_clocks;
>> +	}
>> +
>>  	i2c_davinci_init(dev);
>>  
>>  	r = devm_request_irq(&pdev->dev, dev->irq, i2c_davinci_isr, 0,
>> @@ -849,10 +879,16 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>>  	if (r)
>>  		goto err_unuse_clocks;
>>  
>> +	pm_runtime_mark_last_busy(dev->dev);
>> +	pm_runtime_put_autosuspend(dev->dev);
>> +
>>  	return 0;
>>  
>>  err_unuse_clocks:
>> -	clk_disable_unprepare(dev->clk);
>> +	pm_runtime_dont_use_autosuspend(dev->dev);
>> +	pm_runtime_put_sync(dev->dev);
>> +	pm_runtime_disable(dev->dev);
>> +
>>  	dev->clk = NULL;
> 
> This null setting of clk seems quite bogus and can be cleaned-up.

Do you mean that I should just remove this line?
> 
>>  	return r;
>>  }
> 
> Thanks,
> Sekhar
> 

Re: [PATCH v2 2/3] i2c: davinci: Add PM Runtime Support

[Sekhar Nori]

On Tuesday 22 August 2017 06:47 AM, Franklin S Cooper Jr wrote:
> 
> 
> On 08/21/2017 04:05 AM, Sekhar Nori wrote:
>> On Thursday 17 August 2017 03:47 AM, Franklin S Cooper Jr wrote:
>>
>>> @@ -802,7 +821,6 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>>>  	dev->clk = devm_clk_get(&pdev->dev, NULL);
>>>  	if (IS_ERR(dev->clk))
>>>  		return PTR_ERR(dev->clk);
>>> -	clk_prepare_enable(dev->clk);
>>>  
>>>  	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>>  	dev->base = devm_ioremap_resource(&pdev->dev, mem);
>>> @@ -811,6 +829,18 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>>>  		goto err_unuse_clocks;
>>
>> This goto is wrong now. There is no need to unwind the pm_runtime setup
>> on a devm_ioremap_resource() failure. You can just return error here.
> 
> Ok
>>
>>>  	}
>>>  
>>> +	pm_runtime_set_autosuspend_delay(dev->dev,
>>> +					 DAVINCI_I2C_PM_TIMEOUT);
>>> +	pm_runtime_use_autosuspend(dev->dev);
>>> +
>>> +	pm_runtime_enable(dev->dev);
>>> +
>>> +	r = pm_runtime_get_sync(dev->dev);
>>> +	if (r < 0) {
>>> +		dev_err(dev->dev, "failed to runtime_get device: %d\n", r);
>>> +		goto err_unuse_clocks;
>>> +	}
>>> +
>>>  	i2c_davinci_init(dev);
>>>  
>>>  	r = devm_request_irq(&pdev->dev, dev->irq, i2c_davinci_isr, 0,
>>> @@ -849,10 +879,16 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>>>  	if (r)
>>>  		goto err_unuse_clocks;
>>>  
>>> +	pm_runtime_mark_last_busy(dev->dev);
>>> +	pm_runtime_put_autosuspend(dev->dev);
>>> +
>>>  	return 0;
>>>  
>>>  err_unuse_clocks:
>>> -	clk_disable_unprepare(dev->clk);
>>> +	pm_runtime_dont_use_autosuspend(dev->dev);
>>> +	pm_runtime_put_sync(dev->dev);
>>> +	pm_runtime_disable(dev->dev);
>>> +
>>>  	dev->clk = NULL;
>>
>> This null setting of clk seems quite bogus and can be cleaned-up.
> 
> Do you mean that I should just remove this line?

Yes, and I noticed a similar line in at least one more place that can be
removed as well.

Thanks,
Sekhar

Re: [PATCH v2 1/3] i2c: davinci: Preserve return value of devm_clk_get

[Wolfram Sang]

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On Wed, Aug 16, 2017 at 05:17:13PM -0500, Franklin S Cooper Jr wrote:
> The i2c driver can run into driver dependency issues if its loaded
> before a clock driver it depends on. Therefore, EPROBE_DEFER may be
> returned by devm_clk_get and should be returned in probe to allow the
> kernel to reprobe the driver at a later time. This patch allows the error
> value returned by devm_clk_get to be passed through and not overwritten.
> 
> Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
> Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>

Applied to for-next, thanks!

Waiting for V3 of the other patches.


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