RE: [PATCH v8 0/4] Introduce usb charger framework to deal with the usb gadget power negotation

[Jun Li]

> -----Original Message-----
> From: linux-usb-owner@xxxxxxxxxxxxxxx [mailto:linux-usb-
> owner@xxxxxxxxxxxxxxx] On Behalf Of Baolin Wang
> Sent: Monday, March 28, 2016 2:52 PM
> To: Peter Chen <hzpeterchen@xxxxxxxxx>
> Cc: Felipe Balbi <balbi@xxxxxxxxxx>; Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>;
> Sebastian Reichel <sre@xxxxxxxxxx>; Dmitry Eremin-Solenikov
> <dbaryshkov@xxxxxxxxx>; David Woodhouse <dwmw2@xxxxxxxxxxxxx>; Peter Chen
> <peter.chen@xxxxxxxxxxxxx>; Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>;
> r.baldyga@xxxxxxxxxxx; Yoshihiro Shimoda
> <yoshihiro.shimoda.uh@xxxxxxxxxxx>; Lee Jones <lee.jones@xxxxxxxxxx>; Mark
> Brown <broonie@xxxxxxxxxx>; Charles Keepax
> <ckeepax@xxxxxxxxxxxxxxxxxxxxxxxxxxx>; patches@xxxxxxxxxxxxxxxxxxxxxxxxxxx;
> Linux PM list <linux-pm@xxxxxxxxxxxxxxx>; USB <linux-usb@xxxxxxxxxxxxxxx>;
> device-mainlining@xxxxxxxxxxxxxxxxxxxxxxxxx; LKML <linux-
> kernel@xxxxxxxxxxxxxxx>
> Subject: Re: [PATCH v8 0/4] Introduce usb charger framework to deal with
> the usb gadget power negotation
> 
> On 25 March 2016 at 15:09, Peter Chen <hzpeterchen@xxxxxxxxx> wrote:
> > On Thu, Mar 24, 2016 at 08:35:53PM +0800, Baolin Wang wrote:
> >> Currently the Linux kernel does not provide any standard integration
> >> of this feature that integrates the USB subsystem with the system
> >> power regulation provided by PMICs meaning that either vendors must
> >> add this in their kernels or USB gadget devices based on Linux (such
> >> as mobile phones) may not behave as they should. Thus provide a
> standard framework for doing this in kernel.
> >>
> >> Now introduce one user with wm831x_power to support and test the usb
> >> charger, which is pending testing. Moreover there may be other
> >> potential users will use it in future.
> >>
> >
> > I am afraid I still not find the user (udc driver) for this framework,
> > I would like to see how udc driver block the enumeration until the
> > charger detection has finished, or am I missing something?
> 
> It is not for udc driver but for power users who want to negotiate with
> USB subsystem.
> 

Seems you don't want to guarantee charger type detection is done before
gadget connection(pullup DP), right?
I see you call usb_charger_detect_type() in each gadget usb state changes.

Li Jun  
> >
> > --
> > Best Regards,
> > Peter Chen
> 
> 
> 
> --
> Baolin.wang
> Best Regards
> --
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