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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 11 Sep 2014 21:10:21 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Vivek Gautam <gautam.vivek@...sung.com>,
	Felipe Balbi <balbi@...com>
CC:	Julius Werner <jwerner@...gle.com>,
	Julius Werner <jwerner@...omium.org>,
	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>,
	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 Wednesday 10 September 2014 01:26 PM, Vivek Gautam wrote:
> On Wed, Sep 10, 2014 at 10:53 AM, Vivek Gautam <gautam.vivek@...sung.com> wrote:
>> On Wed, Sep 10, 2014 at 10:23 AM, Felipe Balbi <balbi@...com> wrote:
>>> On Wed, Sep 10, 2014 at 09:09:57AM +0530, Vivek Gautam wrote:
>>>> On Wed, Sep 10, 2014 at 9:07 AM, Vivek Gautam <gautam.vivek@...sung.com> wrote:
>>>>> adding Julius here,
>>>>
>>>> i think i had missed adding Julius for this entire series :-(
>>>> I should be more careful with the CC list in future.
>>>> Added his chromium id, since that seems to be more active.
>>>>
>>>>>
>>>>>
>>>>> 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 ?
> 
> but wait, dwc3 does a phy_init() already, then how xhci will be able to
> do that again. We can't do phy_init() multiple times right ?

right. I think we should split and do phy ops separately for dwc3 host and gadget?

Thanks
Kishon
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/