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FROMGIT: 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.

Bug: 295046582
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>
(cherry picked from commit 803b1c8a0cea58cccde16eba31d285956f4c920c
    https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-next)
Change-Id: Iaa361690d54e64b604667f5d9d7f01482a07725b
Signed-off-by: Jindong Yue <jindong.yue@nxp.com>
This commit is contained in:
Xu Yang 2023-08-01 15:01:10 +08:00 committed by Treehugger Robot
parent 3ebafb7b46
commit 34fde9ec08
1 changed files with 5 additions and 2 deletions
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7
drivers/usb/typec/tcpm/tcpm.c
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@ -4312,7 +4312,9 @@ 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
@ -4601,7 +4603,8 @@ 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);