Hi Prashant,
> -----Original Message----- > From: Prashant Malani <pmal...@chromium.org> > Sent: Wednesday, August 5, 2020 12:37 PM > To: Shaikh, Azhar <azhar.sha...@intel.com> > Cc: ble...@chromium.org; enric.balle...@collabora.com; > gro...@chromium.org; linux-kernel@vger.kernel.org; > heikki.kroge...@linux.intel.com; Patel, Utkarsh H > <utkarsh.h.pa...@intel.com>; Bowman, Casey G > <casey.g.bow...@intel.com>; Mani, Rajmohan > <rajmohan.m...@intel.com> > Subject: Re: [PATCH v2 2/2] platform/chrome: cros_ec_typec: Avoid setting > usb role during disconnect > > Hi Azhar, > > > On Wed, Aug 5, 2020 at 12:22 PM Shaikh, Azhar <azhar.sha...@intel.com> > wrote: > > > > Hi Prashant, > > > > > Is this documented anywhere? Kindly provide the links to that if so. > > > I wasn't aware of any ordering requirements (but I may be missing > something). > > > > The configuration of the connector should always happen in the order > > defined in the USB Type-C specification. Check ch. 2.3 (USB Type-C Spec > R2.0). So that will basically give you: > > > > 1. orientation > > 2. role(s) > > 3. the rest. > > Thanks for the link. Are you referring to Section 2.3 (Configuration > Process) ? I couldn't find anything there which implied any required ordering > (I'm reading Release 2.0, Aug 2019, so I don't know if something has been > added since). > Could you kindly point me to the appropriate subsection? That is the section I was referring to. > > Additionally, I think any ordering requirements there are already handled by > the TCPM in the Chrome OS EC. > > > > > Also I see in USB Type-C Port Manager driver the above mentioned > > sequence being followed > > https://elixir.bootlin.com/linux/latest/source/drivers/usb/typec/tcpm/ > > tcpm.c#L664 > > In addition to the above, note that this is a TCPM implementation (on > Chrome OS the TCPM implementation is in the EC), so what is done there > doesn't necessarily apply to cros-ec-typec. > > Best regards, > > -Prashant > > > > > > > > > > -Prashant > > > > Regards, > > Azhar
