linux-kernel - Re: [PATCH v16 0/4] Introduce usb charger framework to deal with the usb gadget power negotation

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Message-ID: <CAMz4kuKFj=pVoKSA7=2ojGh_MMF4x1DD_d_QmVSPh-k7BbXA0w@mail.gmail.com>
Date:   Wed, 5 Oct 2016 15:57:59 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     NeilBrown <neilb@...e.com>, NeilBrown <nfbrown@...ell.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Sebastian Reichel <sre@...nel.org>,
        Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
        David Woodhouse <dwmw2@...radead.org>, robh@...nel.org,
        Jun Li <jun.li@....com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Ruslan Bilovol <ruslan.bilovol@...il.com>,
        Peter Chen <peter.chen@...escale.com>,
        Alan Stern <stern@...land.harvard.edu>, r.baldyga@...sung.com,
        grygorii.strashko@...com,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Lee Jones <lee.jones@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
        patches@...nsource.wolfsonmicro.com,
        Linux PM list <linux-pm@...r.kernel.org>,
        USB <linux-usb@...r.kernel.org>,
        device-mainlining@...ts.linuxfoundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        "Bird, Timothy" <Tim.Bird@...sony.com>
Subject: Re: [PATCH v16 0/4] Introduce usb charger framework to deal with the
 usb gadget power negotation

Hi Felipe,

On 5 October 2016 at 15:47, Felipe Balbi <balbi@...nel.org> wrote:
>
> Hi Baolin,
>
> Baolin Wang <baolin.wang@...aro.org> writes:
>>>> But you do!
>>>> The mA number from the USB configuration is passed to usb_gadget_vbus_draw.
>>>> Your patch passes that to usb_charger_set_cur_limit_by_type()
>>>> which calls __usb_charger_set_cur_limit_by_type() which will set the
>>>> cur_limit for whichever type uchger->type currently is.
>>>>
>>>> So when it is not relevant, your code *does* set some current limit.
>>>
>>> Suppose the charger type is DCP(it is not relevant to the mA number
>>> from the USB configuration ), it will not do the USB enumeration, then
>>> no USB configuration from host to set current.
>>
>> From the talking, there are some issues (thanks for Neil's comments)
>> need to be fixed as below:
>> 1. Need to add the method getting charger type from extcon subsystem.
>> 2. Need to remove the method getting charger type from power supply.
>> 3. There are still some different views about reporting the maximum
>> current or minimum current to power driver.
>>
>> Now the current v16 patchset can work well on my Spreadtrum platform
>> and Jun's NXP platform, if you like to apply this patchset then I can
>> send out new patches to fix above issues. If you don't like that, I
>> can send out new version patchset to fix above issues. Could you  give
>> me some suggestions what should I do next step? Thanks.
>
> Merge window just opened, nothing will happen for about 2 weeks. How
> about you send a new version after merge window closes and we go from
> there? Fixing 1 and 2 is needed. 3 we need to consider more

Sure. I will send out the new version with fixing these issues. Thanks.

> carefully. Perhaps report both minimum and maximum somehow?
>
> Neil, comments?
>
> --
> balbi



-- 
Baolin.wang
Best Regards