Re: [PATCH 04/15] twl4030_charger: use runtime_pm to keep usb phy active while charging.

[Lee Jones]

On Tue, 24 Feb 2015, NeilBrown wrote:

> The twl4030 usb phy needs to be active while we are using
> the USB VBUS as a current source for charging.
> In particular, the usb3v1 regulator must be enabled and the
> PHY_PWR_PHYPWD bit must be set to keep the phy powered.
> 
> commit ab37813f4093a5f59cb8e083cde277289dc72ed3
>     twl4030_charger: Allow charger to control the regulator that feeds it
> 
> Gave the charger control over the regulator, but didn't resolve
> the PHY_PWR_PHYPWD issue.
> 
> Now that both of these are controlled by runtime_pm in
> phy-twl4030-usb, we can simply take a runtime_pm reference to the USB
> phy whenever the charger wants to use it as a current source.
> 
> So this patch reverts the above commit, and adds the necessary
> runtime_pm calls.
> 
> Signed-off-by: NeilBrown <neilb@xxxxxxx>
> ---
>  drivers/mfd/twl-core.c          |    9 ++++-----

Acked-by: Lee Jones <lee.jones@xxxxxxxxxx>

>  drivers/power/twl4030_charger.c |   18 +++++-------------
>  2 files changed, 9 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
> index 489674a2497e..831696ee2472 100644
> --- a/drivers/mfd/twl-core.c
> +++ b/drivers/mfd/twl-core.c
> @@ -788,9 +788,8 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
>  		static struct regulator_consumer_supply usb1v8 = {
>  			.supply =	"usb1v8",
>  		};
> -		static struct regulator_consumer_supply usb3v1[] = {
> -			{ .supply =	"usb3v1" },
> -			{ .supply =	"bci3v1" },
> +		static struct regulator_consumer_supply usb3v1 = {
> +			.supply =	"usb3v1",
>  		};
>  
>  	/* First add the regulators so that they can be used by transceiver */
> @@ -818,7 +817,7 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
>  				return PTR_ERR(child);
>  
>  			child = add_regulator_linked(TWL4030_REG_VUSB3V1,
> -						      &usb_fixed, usb3v1, 2,
> +						      &usb_fixed, &usb3v1, 1,
>  						      features);
>  			if (IS_ERR(child))
>  				return PTR_ERR(child);
> @@ -838,7 +837,7 @@ add_children(struct twl4030_platform_data *pdata, unsigned irq_base,
>  		if (IS_ENABLED(CONFIG_REGULATOR_TWL4030) && child) {
>  			usb1v5.dev_name = dev_name(child);
>  			usb1v8.dev_name = dev_name(child);
> -			usb3v1[0].dev_name = dev_name(child);
> +			usb3v1.dev_name = dev_name(child);
>  		}
>  	}
>  
> diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
> index 51321f0c5548..11f352a5ef55 100644
> --- a/drivers/power/twl4030_charger.c
> +++ b/drivers/power/twl4030_charger.c
> @@ -22,7 +22,6 @@
>  #include <linux/power_supply.h>
>  #include <linux/notifier.h>
>  #include <linux/usb/otg.h>
> -#include <linux/regulator/machine.h>
>  
>  #define TWL4030_BCIMSTATEC	0x02
>  #define TWL4030_BCIICHG		0x08
> @@ -94,7 +93,6 @@ struct twl4030_bci {
>  	struct work_struct	work;
>  	int			irq_chg;
>  	int			irq_bci;
> -	struct regulator	*usb_reg;
>  	int			usb_enabled;
>  
>  	unsigned long		event;
> @@ -208,7 +206,7 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
>  {
>  	int ret;
>  
> -	if (enable) {
> +	if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
>  		/* Check for USB charger connected */
>  		if (!twl4030_bci_have_vbus(bci))
>  			return -ENODEV;
> @@ -222,14 +220,9 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
>  			return -EACCES;
>  		}
>  
> -		/* Need to keep regulator on */
> +		/* Need to keep phy powered */
>  		if (!bci->usb_enabled) {
> -			ret = regulator_enable(bci->usb_reg);
> -			if (ret) {
> -				dev_err(bci->dev,
> -					"Failed to enable regulator\n");
> -				return ret;
> -			}
> +			pm_runtime_get_sync(bci->transceiver->dev);
>  			bci->usb_enabled = 1;
>  		}
>  
> @@ -244,7 +237,8 @@ static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
>  	} else {
>  		ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
>  		if (bci->usb_enabled) {
> -			regulator_disable(bci->usb_reg);
> +			pm_runtime_mark_last_busy(bci->transceiver->dev);
> +			pm_runtime_put_autosuspend(bci->transceiver->dev);
>  			bci->usb_enabled = 0;
>  		}
>  	}
> @@ -602,8 +596,6 @@ static int __init twl4030_bci_probe(struct platform_device *pdev)
>  	bci->usb.num_properties = ARRAY_SIZE(twl4030_charger_props);
>  	bci->usb.get_property = twl4030_bci_get_property;
>  
> -	bci->usb_reg = regulator_get(bci->dev, "bci3v1");
> -
>  	ret = devm_power_supply_register(&pdev->dev, &bci->usb);
>  	if (ret) {
>  		dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
> 
> 

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org â Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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