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

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Date:	Wed, 10 Sep 2014 09:07:28 +0530
From:	Vivek Gautam <gautam.vivek@...sung.com>
To:	Felipe Balbi <balbi@...com>, Julius Werner <jwerner@...gle.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

adding Julius here,


On Tue, Sep 9, 2014 at 8:12 PM, Felipe Balbi <balbi@...com> wrote:
> On Tue, Sep 09, 2014 at 07:19:50AM +0530, Vivek Gautam wrote:
>> 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
>
> right :-)

alright, i will prepare a patch for the suggested change.

But AFAI remember we had discussion for this patch in earlier version,
and Julius suggested to use a generic approach for such
change wherein other users in future may be able to use the
facility.
Julius any thoughts about the change suggested by Felipe.

[snip]


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