linux-kernel - Re: [PATCH V2] USB: initialize or shutdown PHY when add or remove host controller

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Message-ID: <CADApbeikx1yrjVKOREHq45qZDmxF872FY2tN7WBkhPYY=Uxkcw@mail.gmail.com>
Date:	Wed, 19 Jun 2013 11:23:00 +0800
From:	Chao Xie <xiechao.mail@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Chao Xie <chao.xie@...vell.com>,
	Alan Stern <stern@...land.harvard.edu>,
	"balbi@...com" <balbi@...com>, Roger Quadros <rogerq@...com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH V2] USB: initialize or shutdown PHY when add or remove
 host controller

On Wed, Jun 19, 2013 at 10:48 AM, Greg KH <gregkh@...uxfoundation.org> wrote:
> On Tue, Jun 18, 2013 at 10:31:20PM -0400, Chao Xie wrote:
>> Some controller need software to initialize PHY before add
>> host controller, and shut down PHY after remove host controller.
>> Add the generic code for these controllers so they do not need
>> do it in its own host controller driver.
>
> Why?  What breaks if we add this patch, and what gets fixed?  I'm
> guessing you can then remove code?
>
> What out-of-tree code now works properly?  Or gets broken?
>
> we need more info here please...
>
The patch does not fix any bug.
Some echi-xxx driver will need initialize the phy before it do
usb_add_hcd, and shut down phy after
do usb_remove_hcd, and i did a patch for ehci-mv.c to do above thing.
Alan and Felipe comments on my patch, and they think it is a peice of
generic code, and it can be
moved to hcd to handle it, so other ehci-xxx will not do the same thing again.
So i add the patch to add the generic code in hcd to handle phy
initialization and shut down.

> thanks,
>
> greg k-h
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