linux-kernel - Re: [PATCH v6 4/4] phy: exynos5-usbdrd: Calibrate LOS levels for exynos5420/5800

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Date:	Tue, 9 Sep 2014 07:19:50 +0530
From:	Vivek Gautam <gautam.vivek@...sung.com>
To:	Felipe Balbi <balbi@...com>
Cc:	Linux USB Mailing List <linux-usb@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...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>,
	Greg KH <gregkh@...uxfoundation.org>, kishon <kishon@...com>,
	Alan Stern <stern@...land.harvard.edu>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Jingoo Han <jg1.han@...sung.com>
Subject: Re: [PATCH v6 4/4] phy: exynos5-usbdrd: Calibrate LOS levels for exynos5420/5800

Hi,


On Mon, Sep 8, 2014 at 7:14 PM, Felipe Balbi <balbi@...com> wrote:
> Hi,
>
> On Mon, Sep 08, 2014 at 09:53:09AM +0530, Vivek Gautam wrote:
>> On Fri, Sep 5, 2014 at 11:26 PM, Felipe Balbi <balbi@...com> wrote:
>> > On Thu, Sep 04, 2014 at 12:01:19PM +0530, Vivek Gautam wrote:
>> >> > Don't we have phy_power_on()
>> >> > for that ? It looks like you could just as well do this from
>> >> > phy_power_on() ?
>> >>
>> >> No, unfortunately keeping these calibration settings in phy_power_on()
>> >> doesn't help, since we need to do this after XHCI reset has happened.
>> >
>> > teach xHCI about PHYs ?
>>
>> sorry i couldn't understand you here.
>> Aren't we trying to do the same with Heikki's patch about dwc3 :
>> [PATCH 6/6] usb: dwc3: host: convey the PHYs to xhci
>>
>> and the 2nd patch in this series :
>> [PATCH v6 2/4] usb: host: xhci-plat: Get PHYs for xhci's hcds
>>
>> Is there something else that is expected ?
>
> right, use that to call phy_init() at the right time, then you need to
> add a new ->calibrate() method which, likely, will only be used by you
> ;-)

so you mean, the xhci should itself call phy_init() at a time suitable,
so that ->calibrate() is not required at all ?

i think you meant there - "then you __do not__ need to
> add a new ->calibrate() method which, likely,
will only be used by you", is it ?




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