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| author | Badhri Jagan Sridharan <badhri@google.com> | 2017-08-28 10:23:19 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-29 08:21:10 +0200 |
| commit | f3b73364a1f2ac1a54f58c2387e6593b3d49c965 (patch) | |
| tree | beb4ff79a44955306e4e678286bcf2272b810c0b /drivers/staging | |
| parent | 13cb492cd0ceda6e3f5dd7647ca6964309dd6cf8 (diff) | |
| download | linux-f3b73364a1f2ac1a54f58c2387e6593b3d49c965.tar.gz linux-f3b73364a1f2ac1a54f58c2387e6593b3d49c965.tar.bz2 linux-f3b73364a1f2ac1a54f58c2387e6593b3d49c965.zip | |
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 <yueyao@google.com>
Signed-off-by: Badhri Jagan Sridharan <Badhri@google.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/typec/tcpm.c | 6 |
1 files 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); |