linux-kernel - Re: [PATCH v3 10/22] usb: chipidea: Consolidate extcon notifiers

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Date:   Fri, 2 Sep 2016 11:17:04 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Stephen Boyd <stephen.boyd@...aro.org>
Cc:     linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Andy Gross <andy.gross@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Arnd Bergmann <arnd@...db.de>, Felipe Balbi <balbi@...nel.org>,
        Peter Chen <peter.chen@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Ivan T. Ivanov" <iivanov.xz@...il.com>
Subject: Re: [PATCH v3 10/22] usb: chipidea: Consolidate extcon notifiers

On Wed, Aug 31, 2016 at 05:40:24PM -0700, Stephen Boyd wrote:
> The two extcon notifiers are almost the same except for the
> variable name for the cable structure and the id notifier inverts
> the cable->state logic. Make it the same and replace two
> functions with one to save some lines. This also makes it so that
> the id cable state is true when the id pin is pulled low.
> 
> Cc: Peter Chen <peter.chen@....com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: "Ivan T. Ivanov" <iivanov.xz@...il.com>
> Signed-off-by: Stephen Boyd <stephen.boyd@...aro.org>
> ---
>  drivers/usb/chipidea/core.c | 41 ++++++++++-------------------------------
>  drivers/usb/chipidea/otg.c  |  4 ++--
>  2 files changed, 12 insertions(+), 33 deletions(-)
> 
> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> index f144e1bbcc82..f3b8d7488648 100644
> --- a/drivers/usb/chipidea/core.c
> +++ b/drivers/usb/chipidea/core.c
> @@ -577,35 +577,14 @@ static irqreturn_t ci_irq(int irq, void *data)
>  	return ret;
>  }
>  
> -static int ci_vbus_notifier(struct notifier_block *nb, unsigned long event,
> -			    void *ptr)
> +static int ci_cable_notifier(struct notifier_block *nb, unsigned long event,
> +			     void *ptr)
>  {
> -	struct ci_hdrc_cable *vbus = container_of(nb, struct ci_hdrc_cable, nb);
> -	struct ci_hdrc *ci = vbus->ci;
> +	struct ci_hdrc_cable *cbl = container_of(nb, struct ci_hdrc_cable, nb);
> +	struct ci_hdrc *ci = cbl->ci;
>  
> -	if (event)
> -		vbus->state = true;
> -	else
> -		vbus->state = false;
> -
> -	vbus->changed = true;
> -
> -	ci_irq(ci->irq, ci);
> -	return NOTIFY_DONE;
> -}
> -
> -static int ci_id_notifier(struct notifier_block *nb, unsigned long event,
> -			  void *ptr)
> -{
> -	struct ci_hdrc_cable *id = container_of(nb, struct ci_hdrc_cable, nb);
> -	struct ci_hdrc *ci = id->ci;
> -
> -	if (event)
> -		id->state = false;
> -	else
> -		id->state = true;
> -
> -	id->changed = true;
> +	cbl->state = event;
> +	cbl->changed = true;
>  
>  	ci_irq(ci->irq, ci);
>  	return NOTIFY_DONE;
> @@ -714,7 +693,7 @@ static int ci_get_platdata(struct device *dev,
>  	}
>  
>  	cable = &platdata->vbus_extcon;
> -	cable->nb.notifier_call = ci_vbus_notifier;
> +	cable->nb.notifier_call = ci_cable_notifier;
>  	cable->edev = ext_vbus;
>  
>  	if (!IS_ERR(ext_vbus)) {
> @@ -726,15 +705,15 @@ static int ci_get_platdata(struct device *dev,
>  	}
>  
>  	cable = &platdata->id_extcon;
> -	cable->nb.notifier_call = ci_id_notifier;
> +	cable->nb.notifier_call = ci_cable_notifier;
>  	cable->edev = ext_id;
>  
>  	if (!IS_ERR(ext_id)) {
>  		ret = extcon_get_cable_state_(cable->edev, EXTCON_USB_HOST);
>  		if (ret)
> -			cable->state = false;
> -		else
>  			cable->state = true;
> +		else
> +			cable->state = false;
>  	}
>  	return 0;
>  }
> diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c
> index 0cf149edddd8..fb58d6b312c2 100644
> --- a/drivers/usb/chipidea/otg.c
> +++ b/drivers/usb/chipidea/otg.c
> @@ -63,9 +63,9 @@ u32 hw_read_otgsc(struct ci_hdrc *ci, u32 mask)
>  			val &= ~OTGSC_IDIS;
>  
>  		if (cable->state)
> -			val |= OTGSC_ID;
> +			val &= ~OTGSC_ID; /* A device */
>  		else
> -			val &= ~OTGSC_ID;
> +			val |= OTGSC_ID; /* B device */
>  
>  		if (cable->enabled)
>  			val |= OTGSC_IDIE;

/**
 * struct ci_hdrc_cable - structure for external connector cable state tracking
 * @state: current state of the line

You may change the name of variable "state" to "connected", per I
understand, it has changed to the meaning of connected status for your patch.

-- 

Best Regards,
Peter Chen