linux-kernel - Re: [PATCH v2] usb: dwc2: reset dwc2 core before dwc2_get

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Date:	Fri, 9 Oct 2015 21:19:39 +0000
From:	John Youn <John.Youn@...opsys.com>
To:	Doug Anderson <dianders@...omium.org>,
	John Youn <John.Youn@...opsys.com>
CC:	Yunzhi Li <lyz@...k-chips.com>,
	"jwerner@...omium.org" <jwerner@...omium.org>,
	"huangtao@...k-chips.com" <huangtao@...k-chips.com>,
	"cf@...k-chips.com" <cf@...k-chips.com>,
	"hl@...k-chips.com" <hl@...k-chips.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] usb: dwc2: reset dwc2 core before dwc2_get_hwparams()

On 10/7/2015 5:50 PM, Doug Anderson wrote:
> John,
> 
> On Mon, Oct 5, 2015 at 3:02 PM, John Youn <John.Youn@...opsys.com> wrote:
>> On 10/1/2015 1:50 PM, Doug Anderson wrote:
>>> John,
>>>
>>> On Tue, Aug 18, 2015 at 5:19 PM, John Youn <John.Youn@...opsys.com> wrote:
>>>> Hi Yunzhi,
>>>>
>>>> My concern is with the delays due to calling the dwc2_core_reset
>>>> during probe. You could factor out the assertion of the core
>>>> soft reset from the dwc2_core_reset and just use that before
>>>> calling dwc2_get_hwparams().
>>>>
>>>> You had previously addressed the lengthy probe time issue here:
>>>> http://marc.info/?l=linux-usb&m=142357721304377
>>>>
>>>> This reducing delays patch looks reasonable to me and I think it
>>>> should get merged also. I'll do some testing with it later this
>>>> week.
>>>
>>> Note: you can also avoid the extra reset during probe with something
>>> like <https://chromium-review.googlesource.com/#/c/303152/>.  I'm
>>> happy to post that up if you want, though it depends on lyz's patch.
>>>
>>> ...in Chrome OS we've also just landed lyz's patch to reduce delays.
>>> If there's any fallout I'll report on the list.
>>>
>>> -Doug
>>>
>>
>>
>> Yes, I appreciate if you could submit that. I'd like to merge lyz's
>> reduce delays, lyz's bug fix for hwparams, and your fix for double
>> reset.
> 
> OK, I've posted things up.  Let me know what you think.  Note that I
> took v2 of lyz's patch (not v3) since I liked it better.
> 
> 
>> The gadget side will also need something similar which I can do if
>> needed. Do you guys run gadget mode?
> 
> I don't personally run in gadget mode.  I think it's possible to get
> rk3288 to do it on one of the two ports, but I don't have it setup.
> 

No problem. I can make the gadget changes.

Thanks for submitting this.

Regards,
John

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