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FROMLIST: usb: typec: tcpm: support sink port for debounce

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When both CC1 and CC2 pins are simultaneously pulled up, it often leads
to the double Rp to Vbus cable being stuck in the SNK_ATTACH_WAIT state.
And the state machine fails to transition to the SNK_ATTACHED state.

Therefore, it is recommended to focus on transitioning the sink port to
the SNK_DEBOUNCED state instead. By doing so, the desired outcome can be
achieved more effectively.

[  134.525750] VBUS on
[  134.713240] CC1: 0 -> 3, CC2: 0 -> 3 [state TOGGLING, polarity 0, connected]
[  134.713249] state change TOGGLING -> SNK_ATTACH_WAIT [rev3 NONE_AMS]

Change-Id: Ib21f4f0322a193678a5f22007a515b3b19772b40
Signed-off-by: Michael Wu <michael@allwinnertech.com>
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
Link: https://lore.kernel.org/linux-usb/20240312011300.75081-1-michael@allwinnertech.com/
This commit is contained in:
Michael Wu
2024-03-12 09:13:00 +08:00
committed by Frank Wang
parent 30a61f7bf2
commit 886ba05af3
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/typec/tcpm/tcpm.c
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@@ -4256,6 +4256,8 @@ static void run_state_machine(struct tcpm_port *port)
else if (tcpm_port_is_disconnected(port))
tcpm_set_state(port, SNK_UNATTACHED,
PD_T_PD_DEBOUNCE);
else if (tcpm_port_is_sink(port))
tcpm_set_state(port, SNK_DEBOUNCED, 0);
break;
case SNK_DEBOUNCED:
if (tcpm_port_is_disconnected(port))