On Thu, Mar 18, 2021 at 8:26 AM Adam Thomson Adam.Thomson.Opensource@diasemi.com wrote:
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@google.com Reviewed-by: Guenter Roeck linux@roeck-us.net Reviewed-by: Heikki Krogerus heikki.krogerus@linux.intel.com
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.
I was trying to keep the power_supply_changed call close to the variables which are used to infer the power supply property values. Since port->pps_data.max_curr is already updated here and that's used to infer the CURRENT_MAX a client could still read this before the request goes through right ?
@@ -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?
I thought I deleted that. Looks like I didn't. Will send in a patch to remove that. Will wait for what we decide for the PPS case so that I can send in both in the same patch.
Thanks, Badhri
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