On 17 March 2021 18:13, Badhri Jagan Sridharan wrote:
> tcpm-source-psy- does not invoke power_supply_changed API when
> one of the published power supply properties is changed.
> power_supply_changed needs to be called to notify
> userspace clients(uevents) and kernel clients.
>
> Fixes: f2a8aa053c176("typec: tcpm: Represent source supply through
> power_supply")
> Signed-off-by: Badhri Jagan Sridharan <badhri@xxxxxxxxxx>
> Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> ---
> Changes since V1:
> - Fixed commit message as per Guenter's suggestion
> - Added Reviewed-by tags
> - cc'ed stable
> ---
> 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 11d0c40bc47d..e8936ea17f80 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -945,6 +945,7 @@ static int tcpm_set_current_limit(struct tcpm_port *port,
> u32 max_ma, u32 mv)
>
> port->supply_voltage = mv;
> port->current_limit = max_ma;
> + power_supply_changed(port->psy);
>
> if (port->tcpc->set_current_limit)
> ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
> @@ -2931,6 +2932,7 @@ static int tcpm_pd_select_pdo(struct tcpm_port *port,
> int *sink_pdo,
>
> port->pps_data.supported = false;
> port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
> + power_supply_changed(port->psy);
>
> /*
> * Select the source PDO providing the most power which has a
> @@ -2955,6 +2957,7 @@ static int tcpm_pd_select_pdo(struct tcpm_port *port,
> int *sink_pdo,
> port->pps_data.supported = true;
> port->usb_type =
> POWER_SUPPLY_USB_TYPE_PD_PPS;
> + power_supply_changed(port->psy);
> }
> continue;
> default:
> @@ -3112,6 +3115,7 @@ static unsigned int tcpm_pd_select_pps_apdo(struct
> tcpm_port *port)
> port->pps_data.out_volt));
> port->pps_data.op_curr = min(port->pps_data.max_curr,
> port->pps_data.op_curr);
> + power_supply_changed(port->psy);
> }
>
> return src_pdo;
Regarding selecting PDOs or PPS APDOs, surely we should only notify of a change
when we reach SNK_READY which means a new contract has been established? Until
that point it's possible any requested change could be rejected so why inform
clients before we know the settings have taken effect? I could be missing
something here as it's been a little while since I delved into this, but this
doesn't seem to make sense to me.
> @@ -3347,6 +3351,7 @@ static int tcpm_set_charge(struct tcpm_port *port, bool
> charge)
> return ret;
> }
> port->vbus_charge = charge;
> + power_supply_changed(port->psy);
> return 0;
> }
>
> @@ -3530,6 +3535,7 @@ static void tcpm_reset_port(struct tcpm_port *port)
> port->try_src_count = 0;
> port->try_snk_count = 0;
> port->usb_type = POWER_SUPPLY_USB_TYPE_C;
> + power_supply_changed(port->psy);
This is already taken care of at the end of this function, isn't it?
> port->nr_sink_caps = 0;
> port->sink_cap_done = false;
> if (port->tcpc->enable_frs)
> @@ -5957,7 +5963,7 @@ static int tcpm_psy_set_prop(struct power_supply
> *psy,
> ret = -EINVAL;
> break;
> }
> -
> + power_supply_changed(port->psy);
> return ret;
> }
>
> @@ -6110,6 +6116,7 @@ struct tcpm_port *tcpm_register_port(struct device
> *dev, struct tcpc_dev *tcpc)
> err = devm_tcpm_psy_register(port);
> if (err)
> goto out_role_sw_put;
> + power_supply_changed(port->psy);
>
> port->typec_port = typec_register_port(port->dev, &port->typec_caps);
> if (IS_ERR(port->typec_port)) {
> --
> 2.31.0.rc2.261.g7f71774620-goog
