linux-kernel - RE: [PATCH v2 2/2] platform/chrome: cros_ec_typec: Avoid setting usb role during disconnect

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Date:   Thu, 30 Jul 2020 23:06:12 +0000
From:   "Shaikh, Azhar" <azhar.shaikh@...el.com>
To:     Prashant Malani <pmalani@...omium.org>
CC:     "bleung@...omium.org" <bleung@...omium.org>,
        "enric.balletbo@...labora.com" <enric.balletbo@...labora.com>,
        "groeck@...omium.org" <groeck@...omium.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "heikki.krogerus@...ux.intel.com" <heikki.krogerus@...ux.intel.com>,
        "Patel, Utkarsh H" <utkarsh.h.patel@...el.com>,
        "Bowman, Casey G" <casey.g.bowman@...el.com>,
        "Mani, Rajmohan" <rajmohan.mani@...el.com>
Subject: RE: [PATCH v2 2/2] platform/chrome: cros_ec_typec: Avoid setting usb
 role during disconnect

Hi Prashant,


> -----Original Message-----
> From: Prashant Malani <pmalani@...omium.org>
> Sent: Thursday, July 30, 2020 4:03 PM
> To: Shaikh, Azhar <azhar.shaikh@...el.com>
> Cc: bleung@...omium.org; enric.balletbo@...labora.com;
> groeck@...omium.org; linux-kernel@...r.kernel.org;
> heikki.krogerus@...ux.intel.com; Patel, Utkarsh H
> <utkarsh.h.patel@...el.com>; Bowman, Casey G
> <casey.g.bowman@...el.com>; Mani, Rajmohan
> <rajmohan.mani@...el.com>
> Subject: Re: [PATCH v2 2/2] platform/chrome: cros_ec_typec: Avoid setting
> usb role during disconnect
> 
> Hi Azhar,
> 
> On Thu, Jul 30, 2020 at 03:56:09PM -0700, Azhar Shaikh wrote:
> > On disconnect port partner is removed and usb role is set to NONE.
> > But then in cros_typec_port_update() the role is set again.
> > Avoid this by moving usb_role_switch_set_role() to
> > cros_typec_configure_mux().
> >
> > Signed-off-by: Azhar Shaikh <azhar.shaikh@...el.com>
> > Suggested-by: Prashant Malani <pmalani@...omium.org>
> > ---
> >  drivers/platform/chrome/cros_ec_typec.c | 10 +++++++---
> >  1 file changed, 7 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/platform/chrome/cros_ec_typec.c
> > b/drivers/platform/chrome/cros_ec_typec.c
> > index eb4713b7ae14..df97431b2275 100644
> > --- a/drivers/platform/chrome/cros_ec_typec.c
> > +++ b/drivers/platform/chrome/cros_ec_typec.c
> > @@ -515,6 +515,12 @@ static int cros_typec_configure_mux(struct
> cros_typec_data *typec, int port_num,
> >  	if (ret)
> >  		return ret;
> >
> > +	ret = usb_role_switch_set_role(typec->ports[port_num]->role_sw,
> > +				       pd_ctrl->role &
> PD_CTRL_RESP_ROLE_DATA
> > +				       ? USB_ROLE_HOST : USB_ROLE_DEVICE);
> > +	if (ret)
> > +		return ret;
> 
> Since this was the last switch being configured, please maintain the same
> order and add this at the end of the function, after the if-else if block.
> 

Please correct if my understanding is not correct here:
Set the orientation , set the role, then configure the mux. Shouldn't this be the order?


> Best regards,
> 
> -Prashant