linux-kernel - Re: [PATCH v3 3/3] usb: typec: tcpm: charge current handling for sink during hard reset

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Date:   Mon, 5 Nov 2018 16:15:24 -0800
From:   Badhri Jagan Sridharan <badhri@...gle.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        cw00.choi@...sung.com, a.hajda@...sung.com, jun.li@....com,
        Guenter Roeck <linux@...ck-us.net>, jackp@...eaurora.org,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        USB <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v3 3/3] usb: typec: tcpm: charge current handling for sink
 during hard reset

Hi Heikki, Rob,

Thanks for reviewing !
Should I update the patchset with the Reviewed-by tag and bumpup the
patchset version ?
Or is that not necessary?

Thanks,
Badhri.

On Fri, Nov 2, 2018 at 6:28 AM Heikki Krogerus
<heikki.krogerus@...ux.intel.com> wrote:
>
> On Mon, Oct 01, 2018 at 12:45:01PM -0700, Badhri Jagan Sridharan wrote:
> > During the initial connect to a non-pd port, sink would hard reset
> > twice before deeming that the port partner is non-pd. TCPM sets the
> > the charge path to false during the hard reset. This causes unnecessary
> > connects/disconnects of charge path and makes port take longer to
> > charge from the non-pd ports. Avoid this by not setting the charge path
> > to false unless the partner has already identified to be pd capable.
> >
> > When partner is a pd port, set the charge path to false in
> > SNK_HARD_RESET_SINK_OFF. Set the current limits to default value based
> > of CC pull up and resume the charge path when port enters
> > SNK_HARD_RESET_SINK_ON.
> >
> > Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>
>
> Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
>
> > --------
> > Changes in V3:
> > Rebase on top of usb-next
> >
> > Changes in V2:
> > Based on feedback of jackp@...eaurora.org
> > - vsafe_5v_hard_reset flag from tcpc_config is removed
> > - Patch only differentiates between pd port partner and non-pd port
> > partner
> >
> > V1 version of the patch is here:
> > https://lkml.org/lkml/2018/9/14/11
> > ---
> >  drivers/usb/typec/tcpm/tcpm.c | 9 ++++++++-
> >  1 file changed, 8 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> > index c3ac0e46106b..c25a69922ee6 100644
> > --- a/drivers/usb/typec/tcpm/tcpm.c
> > +++ b/drivers/usb/typec/tcpm/tcpm.c
> > @@ -3273,7 +3273,8 @@ static void run_state_machine(struct tcpm_port *port)
> >       case SNK_HARD_RESET_SINK_OFF:
> >               memset(&port->pps_data, 0, sizeof(port->pps_data));
> >               tcpm_set_vconn(port, false);
> > -             tcpm_set_charge(port, false);
> > +             if (port->pd_capable)
> > +                     tcpm_set_charge(port, false);
> >               tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
> >                              TYPEC_DEVICE);
> >               /*
> > @@ -3305,6 +3306,12 @@ static void run_state_machine(struct tcpm_port *port)
> >                * Similar, dual-mode ports in source mode should transition
> >                * to PE_SNK_Transition_to_default.
> >                */
> > +             if (port->pd_capable) {
> > +                     tcpm_set_current_limit(port,
> > +                                            tcpm_get_current_limit(port),
> > +                                            5000);
> > +                     tcpm_set_charge(port, true);
> > +             }
> >               tcpm_set_attached_state(port, true);
> >               tcpm_set_state(port, SNK_STARTUP, 0);
> >               break;
> > --
> > 2.19.0.605.g01d371f741-goog
>
> thanks,
>
> --
> heikki