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[2/4] i2c: davinci: Add PM Runtime Support

Message ID 20170802221753.13786-3-fcooper@ti.com
State Superseded
Headers show

Commit Message

Franklin S Cooper Jr Aug. 2, 2017, 10:17 p.m. UTC 
This patch adds PM runtime support to the I2C Davinci driver.

Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
---
 drivers/i2c/busses/i2c-davinci.c | 61 ++++++++++++++++++++++++++++++++++------
 1 file changed, 53 insertions(+), 8 deletions(-)

Comments

Grygorii Strashko Aug. 11, 2017, 10:11 p.m. UTC | #1 
On 08/02/2017 05:17 PM, Franklin S Cooper Jr wrote:
> This patch adds PM runtime support to the I2C Davinci driver.
> 
> Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
> Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
> ---
>   drivers/i2c/busses/i2c-davinci.c | 61 ++++++++++++++++++++++++++++++++++------
>   1 file changed, 53 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
> index 5749aac..62ff869 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 +829,17 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>   		goto err_unuse_clocks;
>   	}
>   
> +	pm_runtime_enable(dev->dev);
> +	pm_runtime_set_autosuspend_delay(dev->dev,
> +					 DAVINCI_I2C_PM_TIMEOUT);
> +	pm_runtime_use_autosuspend(dev->dev);

Pls, move autosuspend configuration before pm_runtime_enable()

> +
> +	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;
> +	}
> +

Otherwise looks good to me.
diff mbox

Patch

diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c
index 5749aac..62ff869 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 +829,17 @@  static int davinci_i2c_probe(struct platform_device *pdev)
 		goto err_unuse_clocks;
 	}
 
+	pm_runtime_enable(dev->dev);
+	pm_runtime_set_autosuspend_delay(dev->dev,
+					 DAVINCI_I2C_PM_TIMEOUT);
+	pm_runtime_use_autosuspend(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 +878,16 @@  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 +895,26 @@  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;
 }
 
@@ -881,7 +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;
 }
@@ -891,7 +935,6 @@  static int davinci_i2c_resume(struct device *dev)
 	struct platform_device *pdev = to_platform_device(dev);
 	struct davinci_i2c_dev *i2c_dev = platform_get_drvdata(pdev);
 
-	clk_prepare_enable(i2c_dev->clk);
 	/* take I2C out of reset */
 	davinci_i2c_reset_ctrl(i2c_dev, 1);
 
@@ -901,6 +944,8 @@  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)