linux-kernel - Re: [PATCH v1] usb: typec: tcpm: Check for sink pdp op current only for pd

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Date:   Sat, 14 Oct 2023 20:59:48 -0700
From:   Badhri Jagan Sridharan <badhri@...gle.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     gregkh@...uxfoundation.org, heikki.krogerus@...ux.intel.com,
        kyletso@...gle.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, rdbabiera@...gle.com,
        amitsd@...gle.com, stable@...r.kernel.org
Subject: Re: [PATCH v1] usb: typec: tcpm: Check for sink pdp op current only
 for pd

On Sat, Oct 14, 2023 at 4:59 AM Guenter Roeck <linux@...ck-us.net> wrote:
>
> On Sat, Oct 14, 2023 at 03:17:09AM +0000, Badhri Jagan Sridharan wrote:
> > TCPM checks for sink caps operational current even when PD is disabled.
> > This incorrectly sets tcpm_set_charge() when PD is disabled.
> > Check for sink caps only when PD is disabled.
>                                       ^^^^^^^^
>
> enabled ?

Ah yes ! Fixed in V2. Reworded the commit title as well.

Thanks,
Badhri

>
>
> >
> > [   97.572342] Start toggling
> > [   97.578949] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, disconnected]
> > [   99.571648] CC1: 0 -> 0, CC2: 0 -> 4 [state TOGGLING, polarity 0, connected]
> > [   99.571658] state change TOGGLING -> SNK_ATTACH_WAIT [rev3 NONE_AMS]
> > [   99.571673] pending state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED @ 170 ms [rev3 NONE_AMS]
> > [   99.741778] state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED [delayed 170 ms]
> > [   99.789283] CC1: 0 -> 0, CC2: 4 -> 5 [state SNK_DEBOUNCED, polarity 0, connected]
> > [   99.789306] state change SNK_DEBOUNCED -> SNK_DEBOUNCED [rev3 NONE_AMS]
> > [   99.903584] VBUS on
> > [   99.903591] state change SNK_DEBOUNCED -> SNK_ATTACHED [rev3 NONE_AMS]
> > [   99.903600] polarity 1
> > [   99.910155] enable vbus discharge ret:0
> > [   99.910160] Requesting mux state 1, usb-role 2, orientation 2
> > [   99.946791] state change SNK_ATTACHED -> SNK_STARTUP [rev3 NONE_AMS]
> > [   99.946798] state change SNK_STARTUP -> SNK_DISCOVERY [rev3 NONE_AMS]
> > [   99.946800] Setting voltage/current limit 5000 mV 500 mA
> > [   99.946803] vbus=0 charge:=1
> > [  100.027139] state change SNK_DISCOVERY -> SNK_READY [rev3 NONE_AMS]
> > [  100.027145] Setting voltage/current limit 5000 mV 3000 mA
> > [  100.466830] VBUS on
> >
> > Cc: stable@...r.kernel.org
> > Fixes: 34fde9ec08a3 ("FROMGIT: usb: typec: tcpm: not sink vbus if operational current is 0mA")
> > Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>
> > ---
> >  drivers/usb/typec/tcpm/tcpm.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> > index 6e843c511b85..994493481c24 100644
> > --- a/drivers/usb/typec/tcpm/tcpm.c
> > +++ b/drivers/usb/typec/tcpm/tcpm.c
> > @@ -4268,7 +4268,8 @@ static void run_state_machine(struct tcpm_port *port)
> >                               current_lim = PD_P_SNK_STDBY_MW / 5;
> >                       tcpm_set_current_limit(port, current_lim, 5000);
> >                       /* Not sink vbus if operational current is 0mA */
> > -                     tcpm_set_charge(port, !!pdo_max_current(port->snk_pdo[0]));
> > +                     tcpm_set_charge(port, port->pd_supported ?
> > +                                     !!pdo_max_current(port->snk_pdo[0]) : true);
> >
> >                       if (!port->pd_supported)
> >                               tcpm_set_state(port, SNK_READY, 0);
> >
> > base-commit: 1034cc423f1b4a7a9a56d310ca980fcd2753e11d
> > --
> > 2.42.0.655.g421f12c284-goog
> >