linux-kernel - Re: [PATCH 2/4] usb: host: xhci-plat: Add support to get PHYs

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Date:	Tue, 24 Jun 2014 11:40:07 +0530
From:	Vivek Gautam <gautam.vivek@...sung.com>
To:	Julius Werner <jwerner@...omium.org>
Cc:	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	kishon <kishon@...com>, Mathias Nyman <mathias.nyman@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Kukjin Kim <kgene.kim@...sung.com>
Subject: Re: [PATCH 2/4] usb: host: xhci-plat: Add support to get PHYs

Hi,


On Tue, Jun 10, 2014 at 1:52 AM, Julius Werner <jwerner@...omium.org> wrote:
>> diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
>> index 9ffecd5..453d89e 100644
>> --- a/drivers/usb/host/xhci.h
>> +++ b/drivers/usb/host/xhci.h
>> @@ -1582,6 +1582,9 @@ struct xhci_hcd {
>>         u32                     port_status_u0;
>>  /* Compliance Mode Timer Triggered every 2 seconds */
>>  #define COMP_MODE_RCVRY_MSECS 2000
>> +       /* phys for the controller */
>> +       struct phy              *phy2_gen;
>> +       struct phy              *phy3_gen;
>>  };
>
> I don't think adding new variables here and restricting most of this
> logic to xhci-plat.c (in the next patch) is the best way to do it.
> There's no conceptual reason why other host controllers (e.g. xhci-pci
> or even EHCI) could not have a similar need to tune their PHY after
> reset. PHYs are universal to all host controllers.
>
> There is already a 'phy' member in struct usb_hcd which I think is
> mostly unused right now. I think it would be much less
> confusing/redundant to reuse that member for this purpose (you could
> still set it up from xhci_plat_probe(), and then call it from
> hcd_bus_resume() or something like that). Since XHCI host controllers
> already conveniently have two struct usb_hcd (one for 2.0 and one for
> 3.0), you can cleanly store references to your two PHYs in there.

Ok, i will look into the suggested approach, and raise flag in case i
have doubts.



-- 
Best Regards
Vivek Gautam
Samsung R&D Institute, Bangalore
India
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