linux-kernel - Re: [PATCH 1/3 v2] pch_udc: Detecting VBUS through GPIO

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Date:	Fri, 3 Feb 2012 09:32:48 +0200
From:	Felipe Balbi <balbi@...com>
To:	Tomoya MORINAGA <tomoya.rohm@...il.com>
Cc:	Felipe Balbi <balbi@...com>, Greg Kroah-Hartman <gregkh@...e.de>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	qi.wang@...el.com, yong.y.wang@...el.com, joel.clark@...el.com,
	kok.howg.ewe@...el.com
Subject: Re: [PATCH 1/3 v2] pch_udc: Detecting VBUS through GPIO

Hi,

On Fri, Feb 03, 2012 at 04:35:26PM +0900, Tomoya MORINAGA wrote:
> Problem:
>  In USB Suspend, pch_udc handles 'disconnect'.
> 
> Root cause:
>  The current pch_udc is not monitoring VBUS.
>  When USB cable is disconnected, USB Device Controller generates
>  an interrupt of USB Suspend.
>  pch_udc cannot distinguish it is USB Suspend or disconnect.
>  Therefore, pch_udc handles 'disconnect' after an interrupt of
>  USB Suspend happend.
> 
> Solution:
>  VBUS is detected through GPIO.
>  After an interrupt produced USB Suspend, if VBUS is Low,
>  pch_udc handles 'disconnect'.
>  If VBUS is High, pch_udc handles 'suspend'.
> 
> Signed-off-by: Tomoya MORINAGA <tomoya.rohm@...il.com>

Next time, please reply to the v1 of the patch. git send-email has this
--in-reply-to option which helps with that ;-)

-- 
balbi

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