Re: [PATCH V2] USB: initialize or shutdown PHY when add or removehost controller

From: Chao Xie
Date: Tue Jun 18 2013 - 23:23:20 EST

On Wed, Jun 19, 2013 at 10:48 AM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> 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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