linux-kernel - Re: [PATCH v6 3/3] power: supply: cros-ec-usbpd-charger: Fix host events

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Date:   Thu, 16 Jan 2020 11:45:56 -0800
From:   Benson Leung <bleung@...gle.com>
To:     Prashant Malani <pmalani@...omium.org>
Cc:     enric.balletbo@...labora.com, groeck@...omium.org,
        bleung@...omium.org, lee.jones@...aro.org, sre@...nel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Jon Flatley <jflat@...omium.org>
Subject: Re: [PATCH v6 3/3] power: supply: cros-ec-usbpd-charger: Fix host
 events

On Tue, Jan 14, 2020 at 03:22:22PM -0800, Prashant Malani wrote:
> From: Jon Flatley <jflat@...omium.org>
> 
> There's a bug on ACPI platforms where host events from the ECPD ACPI
> device never make their way to the cros-ec-usbpd-charger driver. This
> makes it so the only time the charger driver updates its state is when
> user space accesses its sysfs attributes.
> 
> Now that these events have been unified into a single notifier chain on
> both ACPI and non-ACPI platforms, update the charger driver to use this
> new notifier.
> 
> Signed-off-by: Jon Flatley <jflat@...omium.org>
> Signed-off-by: Prashant Malani <pmalani@...omium.org>

Only a minor nit. Otherwise,
Reviewed-by: Benson Leung <bleung@...omium.org>


> ---
> 
> Changes in v6(pmalani@...omium.org):
> - Patch first introduced into the series in v6.
> 
>  drivers/power/supply/Kconfig              |  2 +-
>  drivers/power/supply/cros_usbpd-charger.c | 50 ++++++++---------------
>  2 files changed, 19 insertions(+), 33 deletions(-)
> 
> diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
> index 27164a1d3c7c4..ba74ddd793c3d 100644
> --- a/drivers/power/supply/Kconfig
> +++ b/drivers/power/supply/Kconfig
> @@ -659,7 +659,7 @@ config CHARGER_RT9455
>  
>  config CHARGER_CROS_USBPD
>  	tristate "ChromeOS EC based USBPD charger"
> -	depends on CROS_EC
> +	depends on CROS_USBPD_NOTIFY
>  	default n
>  	help
>  	  Say Y here to enable ChromeOS EC based USBPD charger
> diff --git a/drivers/power/supply/cros_usbpd-charger.c b/drivers/power/supply/cros_usbpd-charger.c
> index 6cc7c3910e098..7f7e051262170 100644
> --- a/drivers/power/supply/cros_usbpd-charger.c
> +++ b/drivers/power/supply/cros_usbpd-charger.c
> @@ -8,6 +8,7 @@
>  #include <linux/mfd/cros_ec.h>
>  #include <linux/module.h>
>  #include <linux/platform_data/cros_ec_commands.h>
> +#include <linux/platform_data/cros_usbpd_notify.h>

Really minor nit. Alphabetize this #include. This insertion should
be one line below.

>  #include <linux/platform_data/cros_ec_proto.h>
>  #include <linux/platform_device.h>
>  #include <linux/power_supply.h>
> @@ -524,32 +525,21 @@ static int cros_usbpd_charger_property_is_writeable(struct power_supply *psy,
>  }
>  
>  static int cros_usbpd_charger_ec_event(struct notifier_block *nb,
> -				       unsigned long queued_during_suspend,
> +				       unsigned long host_event,
>  				       void *_notify)
>  {
> -	struct cros_ec_device *ec_device;
> -	struct charger_data *charger;
> -	u32 host_event;
> +	struct charger_data *charger = container_of(nb, struct charger_data,
> +						    notifier);
>  
> -	charger = container_of(nb, struct charger_data, notifier);
> -	ec_device = charger->ec_device;
> -
> -	host_event = cros_ec_get_host_event(ec_device);
> -	if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU)) {
> -		cros_usbpd_charger_power_changed(charger->ports[0]->psy);
> -		return NOTIFY_OK;
> -	} else {
> -		return NOTIFY_DONE;
> -	}
> +	cros_usbpd_charger_power_changed(charger->ports[0]->psy);
> +	return NOTIFY_OK;
>  }
>  
>  static void cros_usbpd_charger_unregister_notifier(void *data)
>  {
>  	struct charger_data *charger = data;
> -	struct cros_ec_device *ec_device = charger->ec_device;
>  
> -	blocking_notifier_chain_unregister(&ec_device->event_notifier,
> -					   &charger->notifier);
> +	cros_usbpd_unregister_notify(&charger->notifier);
>  }
>  
>  static int cros_usbpd_charger_probe(struct platform_device *pd)
> @@ -683,21 +673,17 @@ static int cros_usbpd_charger_probe(struct platform_device *pd)
>  		goto fail;
>  	}
>  
> -	if (ec_device->mkbp_event_supported) {
> -		/* Get PD events from the EC */
> -		charger->notifier.notifier_call = cros_usbpd_charger_ec_event;
> -		ret = blocking_notifier_chain_register(
> -						&ec_device->event_notifier,
> -						&charger->notifier);
> -		if (ret < 0) {
> -			dev_warn(dev, "failed to register notifier\n");
> -		} else {
> -			ret = devm_add_action_or_reset(dev,
> -					cros_usbpd_charger_unregister_notifier,
> -					charger);
> -			if (ret < 0)
> -				goto fail;
> -		}
> +	/* Get PD events from the EC */
> +	charger->notifier.notifier_call = cros_usbpd_charger_ec_event;
> +	ret = cros_usbpd_register_notify(&charger->notifier);
> +	if (ret < 0) {
> +		dev_warn(dev, "failed to register notifier\n");
> +	} else {
> +		ret = devm_add_action_or_reset(dev,
> +				cros_usbpd_charger_unregister_notifier,
> +				charger);
> +		if (ret < 0)
> +			goto fail;
>  	}
>  
>  	return 0;
> -- 
> 2.25.0.341.g760bfbb309-goog
> 

-- 
Benson Leung
Staff Software Engineer
Chrome OS Kernel
Google Inc.
bleung@...gle.com
Chromium OS Project
bleung@...omium.org

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