From f3b73364a1f2ac1a54f58c2387e6593b3d49c965 Mon Sep 17 00:00:00 2001 From: Badhri Jagan Sridharan Date: Mon, 28 Aug 2017 10:23:19 -0700 Subject: [PATCH] staging: typec: tcpm: add cc change handling in src states In the case that the lower layer driver reports a cc change directly from SINK state to SOURCE state, TCPM doesn't handle these cc change in SRC_SEND_CAPABILITIES, SRC_READY states. And with SRC_ATTACHED state, the change is not handled as the port is still considered connected. [49606.131672] state change DRP_TOGGLING -> SRC_ATTACH_WAIT [49606.131701] pending state change SRC_ATTACH_WAIT -> SRC_ATTACHED @ 200 ms [49606.329952] state change SRC_ATTACH_WAIT -> SRC_ATTACHED [delayed 200 ms] [49606.329978] polarity 0 [49606.329989] Requesting mux mode 1, config 0, polarity 0 [49606.349416] vbus:=1 charge=0 [49606.372274] pending state change SRC_ATTACHED -> SRC_UNATTACHED @ 480 ms [49606.372431] VBUS on [49606.372488] state change SRC_ATTACHED -> SRC_STARTUP ... (the lower layer driver reports a direct change from source to sink) [49606.536927] pending state change SRC_SEND_CAPABILITIES -> SRC_SEND_CAPABILITIES @ 150 ms [49606.547244] CC1: 2 -> 5, CC2: 0 -> 0 [state SRC_SEND_CAPABILITIES, polarity 0, connected] This can happen when the lower layer driver and/or the hardware handles a portion of the Type-C state machine work, and quietly goes through the unattached state. Originally-from: Yueyao Zhu Signed-off-by: Badhri Jagan Sridharan Reviewed-by: Guenter Roeck Signed-off-by: Greg Kroah-Hartman --- drivers/staging/typec/tcpm.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c index 9507f834d5da..fa2e59b5ab69 100644 --- a/drivers/staging/typec/tcpm.c +++ b/drivers/staging/typec/tcpm.c @@ -2879,10 +2879,12 @@ static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1, tcpm_set_state(port, SRC_ATTACH_WAIT, 0); break; case SRC_ATTACHED: - if (tcpm_port_is_disconnected(port)) + case SRC_SEND_CAPABILITIES: + case SRC_READY: + if (tcpm_port_is_disconnected(port) || + !tcpm_port_is_source(port)) tcpm_set_state(port, SRC_UNATTACHED, 0); break; - case SNK_UNATTACHED: if (tcpm_port_is_sink(port)) tcpm_set_state(port, SNK_ATTACH_WAIT, 0); -- 2.20.1