linux-kernel - Re: [PATCH] cros_pchg: Sync port status on resume

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Date:   Mon, 8 May 2023 14:32:28 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Daisuke Nojiri <dnojiri@...omium.org>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cros_pchg: Sync port status on resume

Hi,

On Mon, Apr 17, 2023 at 03:16:10PM -0700, Daisuke Nojiri wrote:
> When a stylus is removed (or attached) during suspend, the device detach
> (or attach) events can be lost. This patch makes the peripheral device
> charge driver retrieve the latest status from the EC on resume.
> 
> BUG=b:276414488
> TEST=Redrix
> 
> Signed-off-by: Daisuke Nojiri <dnojiri@...omium.org>
> ---

Thanks, queued.

-- Sebastian

>  .../power/supply/cros_peripheral_charger.c    | 25 ++++++++++++++++---
>  1 file changed, 22 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/power/supply/cros_peripheral_charger.c b/drivers/power/supply/cros_peripheral_charger.c
> index 1379afd9698d..a204f2355be4 100644
> --- a/drivers/power/supply/cros_peripheral_charger.c
> +++ b/drivers/power/supply/cros_peripheral_charger.c
> @@ -227,8 +227,7 @@ static int cros_pchg_get_prop(struct power_supply *psy,
>  	return 0;
>  }
>  
> -static int cros_pchg_event(const struct charger_data *charger,
> -			   unsigned long host_event)
> +static int cros_pchg_event(const struct charger_data *charger)
>  {
>  	int i;
>  
> @@ -256,7 +255,7 @@ static int cros_ec_notify(struct notifier_block *nb,
>  	if (!(host_event & EC_MKBP_PCHG_DEVICE_EVENT))
>  		return NOTIFY_DONE;
>  
> -	return cros_pchg_event(charger, host_event);
> +	return cros_pchg_event(charger);
>  }
>  
>  static int cros_pchg_probe(struct platform_device *pdev)
> @@ -281,6 +280,8 @@ static int cros_pchg_probe(struct platform_device *pdev)
>  	charger->ec_dev = ec_dev;
>  	charger->ec_device = ec_device;
>  
> +	platform_set_drvdata(pdev, charger);
> +
>  	ret = cros_pchg_port_count(charger);
>  	if (ret <= 0) {
>  		/*
> @@ -349,9 +350,27 @@ static int cros_pchg_probe(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +#ifdef CONFIG_PM_SLEEP
> +static int __maybe_unused cros_pchg_resume(struct device *dev)
> +{
> +	struct charger_data *charger = dev_get_drvdata(dev);
> +
> +	/*
> +	 * Sync all ports on resume in case reports from EC are lost during
> +	 * the last suspend.
> +	 */
> +	cros_pchg_event(charger);
> +
> +	return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(cros_pchg_pm_ops, NULL, cros_pchg_resume);
> +
>  static struct platform_driver cros_pchg_driver = {
>  	.driver = {
>  		.name = DRV_NAME,
> +		.pm = &cros_pchg_pm_ops,
>  	},
>  	.probe = cros_pchg_probe
>  };
> -- 
> 2.39.2
> 

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