usb: typec: tcpm: Wait in SNK_DEBOUNCED until disconnect
Stub from the spec: "4.5.2.2.4.2 Exiting from AttachWait.SNK State A Sink shall transition to Unattached.SNK when the state of both the CC1 and CC2 pins is SNK.Open for at least tPDDebounce. A DRP shall transition to Unattached.SRC when the state of both the CC1 and CC2 pins is SNK.Open for at least tPDDebounce." This change makes TCPM to wait in SNK_DEBOUNCED state until CC1 and CC2 pins is SNK.Open for at least tPDDebounce. Previously, TCPM resets the port if vbus is not present in PD_T_PS_SOURCE_ON. This causes TCPM to loop continuously when connected to a faulty power source that does not present vbus. Waiting in SNK_DEBOUNCED also ensures that TCPM is adherant to "4.5.2.2.4.2 Exiting from AttachWait.SNK State" requirements. [ 6169.280751] CC1: 0 -> 0, CC2: 0 -> 5 [state TOGGLING, polarity 0, connected] [ 6169.280759] state change TOGGLING -> SNK_ATTACH_WAIT [rev2 NONE_AMS] [ 6169.280771] pending state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED @ 170 ms [rev2 NONE_AMS] [ 6169.282427] CC1: 0 -> 0, CC2: 5 -> 5 [state SNK_ATTACH_WAIT, polarity 0, connected] [ 6169.450825] state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED [delayed 170 ms] [ 6169.450834] pending state change SNK_DEBOUNCED -> PORT_RESET @ 480 ms [rev2 NONE_AMS] [ 6169.930892] state change SNK_DEBOUNCED -> PORT_RESET [delayed 480 ms] [ 6169.931296] disable vbus discharge ret:0 [ 6169.931301] Setting usb_comm capable false [ 6169.932783] Setting voltage/current limit 0 mV 0 mA [ 6169.932802] polarity 0 [ 6169.933706] Requesting mux state 0, usb-role 0, orientation 0 [ 6169.936689] cc:=0 [ 6169.936812] pending state change PORT_RESET -> PORT_RESET_WAIT_OFF @ 100 ms [rev2 NONE_AMS] [ 6169.937157] CC1: 0 -> 0, CC2: 5 -> 0 [state PORT_RESET, polarity 0, disconnected] [ 6170.036880] state change PORT_RESET -> PORT_RESET_WAIT_OFF [delayed 100 ms] [ 6170.036890] state change PORT_RESET_WAIT_OFF -> SNK_UNATTACHED [rev2 NONE_AMS] [ 6170.036896] Start toggling [ 6170.041412] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, disconnected] [ 6170.042973] CC1: 0 -> 0, CC2: 0 -> 5 [state TOGGLING, polarity 0, connected] [ 6170.042976] state change TOGGLING -> SNK_ATTACH_WAIT [rev2 NONE_AMS] [ 6170.042981] pending state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED @ 170 ms [rev2 NONE_AMS] [ 6170.213014] state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED [delayed 170 ms] [ 6170.213019] pending state change SNK_DEBOUNCED -> PORT_RESET @ 480 ms [rev2 NONE_AMS] [ 6170.693068] state change SNK_DEBOUNCED -> PORT_RESET [delayed 480 ms] [ 6170.693304] disable vbus discharge ret:0 [ 6170.693308] Setting usb_comm capable false [ 6170.695193] Setting voltage/current limit 0 mV 0 mA [ 6170.695210] polarity 0 [ 6170.695990] Requesting mux state 0, usb-role 0, orientation 0 [ 6170.701896] cc:=0 [ 6170.702181] pending state change PORT_RESET -> PORT_RESET_WAIT_OFF @ 100 ms [rev2 NONE_AMS] [ 6170.703343] CC1: 0 -> 0, CC2: 5 -> 0 [state PORT_RESET, polarity 0, disconnected] Fixes: f0690a25 ("staging: typec: USB Type-C Port Manager (tcpm)") Cc: stable@vger.kernel.org Acked-by:Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by:
Badhri Jagan Sridharan <badhri@google.com> Link: https://lore.kernel.org/r/20211130001825.3142830-1-badhri@google.com Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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