+ jackp@xxxxxxxxxxxxxx On Fri, Sep 28, 2018 at 4:47 PM Badhri Jagan Sridharan <badhri@xxxxxxxxxx> 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@xxxxxxxxxx> > > -------- > Changes in V2: > Based on feedback of jackp@xxxxxxxxxxxxxx > - 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.c | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-) > > diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c > index c3ac0e46106b4..c25a69922ee6a 100644 > --- a/drivers/usb/typec/tcpm.c > +++ b/drivers/usb/typec/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 >
