linux-kernel - Re: [PATCH 2/3] pch_udc: Detecting VBUS through GPIO with interrupt

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Date:	Thu, 9 Feb 2012 09:59:34 +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 2/3] pch_udc: Detecting VBUS through GPIO with interrupt

On Fri, Feb 03, 2012 at 04:14:18PM +0900, Tomoya MORINAGA wrote:
> Problem:
>  pch_udc continues operation even if VBUS becomes Low.
>  pch_udc performs D+ pulling up before VBUS becomes High.
>  USB device should be controlled according to VBUS state.
> 
> Root cause:
>  The current pch_udc is not always monitoring VBUS.
> 
> Solution:
>  The change of VBUS is detected using an interrupt of GPIO.
>  If VBUS became Low, pch_udc handles 'disconnect'.
>  After VBUS became High, a pull improves D+, and pch_udc
>  handles 'connect'.
> 
> Signed-off-by: Tomoya MORINAGA <tomoya.rohm@...il.com>

applied my fixed version
thanks

-- 
balbi

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