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

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Date:	Tue, 29 Mar 2016 08:45:43 +0000
From:	Jun Li <jun.li@....com>
To:	Baolin Wang <baolin.wang@...aro.org>,
	Peter Chen <hzpeterchen@...il.com>
CC:	Felipe Balbi <balbi@...nel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Peter Chen <peter.chen@...escale.com>,
	Alan Stern <stern@...land.harvard.edu>,
	"r.baldyga@...sung.com" <r.baldyga@...sung.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" 
	<patches@...nsource.wolfsonmicro.com>,
	Linux PM list <linux-pm@...r.kernel.org>,
	USB <linux-usb@...r.kernel.org>,
	"device-mainlining@...ts.linuxfoundation.org" 
	<device-mainlining@...ts.linuxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v8 0/4] Introduce usb charger framework to deal with the
 usb gadget power negotation



> -----Original Message-----
> From: linux-usb-owner@...r.kernel.org [mailto:linux-usb-
> owner@...r.kernel.org] On Behalf Of Baolin Wang
> Sent: Monday, March 28, 2016 2:52 PM
> To: Peter Chen <hzpeterchen@...il.com>
> Cc: Felipe Balbi <balbi@...nel.org>; Greg KH <gregkh@...uxfoundation.org>;
> Sebastian Reichel <sre@...nel.org>; Dmitry Eremin-Solenikov
> <dbaryshkov@...il.com>; David Woodhouse <dwmw2@...radead.org>; Peter Chen
> <peter.chen@...escale.com>; Alan Stern <stern@...land.harvard.edu>;
> r.baldyga@...sung.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>
> 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@...il.com> 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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