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usb: typec: tcpm: not sink vbus if operational current is 0mA

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PD3.0 Spec 6.4.1.3.1 said:
For a Sink requiring no power from the Source, the Voltage (B19-10)
shall be set to 5V and the Operational Current Shall be set to 0mA.

Therefore, we can keep sink path closed if the operational current of
the first fixed PDO is 0mA.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230801070110.1653394-1-xu.yang_2@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xu Yang 2023-08-01 15:01:10 +08:00 • committed by Greg Kroah-Hartman
parent 2569088dba
commit 803b1c8a0c
1 changed files with 5 additions and 2 deletions
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7
drivers/usb/typec/tcpm/tcpm.c
View file

@ -4231,7 +4231,9 @@ static void run_state_machine(struct tcpm_port *port)
if (port->slow_charger_loop && (current_lim > PD_P_SNK_STDBY_MW / 5))
current_lim = PD_P_SNK_STDBY_MW / 5;
tcpm_set_current_limit(port, current_lim, 5000);
tcpm_set_charge(port, true);
/* Not sink vbus if operational current is 0mA */
tcpm_set_charge(port, !!pdo_max_current(port->snk_pdo[0]));
if (!port->pd_supported)
tcpm_set_state(port, SNK_READY, 0);
else
@ -4512,7 +4514,8 @@ static void run_state_machine(struct tcpm_port *port)
tcpm_set_current_limit(port,
tcpm_get_current_limit(port),
5000);
tcpm_set_charge(port, true);
/* Not sink vbus if operational current is 0mA */
tcpm_set_charge(port, !!pdo_max_current(port->snk_pdo[0]));
}
if (port->ams == HARD_RESET)
tcpm_ams_finish(port);