Greetings,
I have a custom design with a Fairchild FUSB302 Type-C chip driver
that I'm testing with Linux 4.17 and a BTI AC-60TC 60W charger. For
this design we are using Type-C as a power/charger input only - no
USB2/3 is connected. The board consumes approximately 12W typical
which doesn't leave enough to charge the battery in a timely fashion
unless switching up to a higher voltage via USB-PD.
I'm finding that when there is no fusb302 driver enabled the charger
puts out 5V@3A as expected but when I enable the fusb302 driver the
charger cuts out momentarily when the fusb302 driver comes up on its
way to switching up to 20V which causes the board to reboot.
Here's my dts config for a 20V@3A 60W capable sink:
fusb302@0x24 {
compatible = "fcs,fusb302";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_usbpd>;
reg = <0x24>;
interrupt-parent = <&gpio4>;
interrupts = <10 IRQ_TYPE_EDGE_FALLING>;
fcs,max-sink-microvolt = <20000000>;
fcs,max-sink-microamp = <3000000>;
fcs,max-sink-microwatt = <60000000>;
};
Here's what I see from the kernel while booting without a battery:
[ 6.122858] typec_fusb302 1-0024: 1-0024 supply vbus not found,
using dummy regulator
^^^^^ supply cuts out momentarily at this point causing board reboot
Here's what I see from /sys/kernel/debug/tcpm when I add a battery on
the system with enough charge to keep it powered during the VUSB cut:
[ 6.134543] Setting voltage/current limit 0 mV 0 mA
[ 6.134960] polarity 0
[ 6.135304] Requesting mux mode 0, usb-role 0, orientation 0
[ 6.136271] state change INVALID_STATE -> SNK_UNATTACHED
[ 6.136334] CC1: 0 -> 0, CC2: 0 -> 0 [state SNK_UNATTACHED,
polarity 0, disconnected]
[ 6.136358] 1-0024: registered
[ 6.144183] Setting voltage/current limit 0 mV 0 mA
[ 6.144452] polarity 0
[ 6.144586] Requesting mux mode 0, usb-role 0, orientation 0
[ 6.145592] cc:=0
[ 6.164039] pending state change PORT_RESET -> PORT_RESET_WAIT_OFF @ 100 ms
[ 6.176918] VBUS off
^^^^^ this appears to be where the charger first cuts out
[ 6.273374] state change PORT_RESET -> PORT_RESET_WAIT_OFF [delayed 100 ms]
[ 6.273394] state change PORT_RESET_WAIT_OFF -> SNK_UNATTACHED
[ 6.273403] Start DRP toggling
[ 6.297315] CC1: 0 -> 0, CC2: 0 -> 5 [state DRP_TOGGLING, polarity
0, connected]
[ 6.297327] state change DRP_TOGGLING -> SNK_ATTACH_WAIT
[ 6.297529] pending state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED @ 200 ms
[ 6.409960] VBUS on
[ 6.513218] state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED [delayed 200 ms]
[ 6.513236] state change SNK_DEBOUNCED -> SNK_ATTACHED
[ 6.513244] polarity 1
[ 6.513251] Requesting mux mode 1, usb-role 2, orientation 2
[ 6.515121] state change SNK_ATTACHED -> SNK_STARTUP
[ 6.515418] state change SNK_STARTUP -> SNK_DISCOVERY
[ 6.515428] Setting voltage/current limit 5000 mV 3000 mA
[ 6.515462] vbus=0 charge:=1
[ 6.515536] state change SNK_DISCOVERY -> SNK_WAIT_CAPABILITIES
[ 6.530767] pending state change SNK_WAIT_CAPABILITIES ->
HARD_RESET_SEND @ 240 ms
[ 6.567379] PD RX, header: 0x6161 [1]
[ 6.567407] PDO 0: type 0, 5000 mV, 3000 mA [E]
[ 6.567417] PDO 1: type 0, 9000 mV, 3000 mA []
[ 6.567427] PDO 2: type 0, 12000 mV, 3000 mA []
[ 6.567436] PDO 3: type 0, 15000 mV, 3000 mA []
[ 6.567444] PDO 4: type 0, 18000 mV, 3000 mA []
[ 6.567452] PDO 5: type 0, 20000 mV, 3000 mA []
[ 6.567459] state change SNK_WAIT_CAPABILITIES -> SNK_NEGOTIATE_CAPABILITIES
[ 6.567643] cc=0 cc1=0 cc2=5 vbus=0 vconn=sink polarity=1
[ 6.567657] Requesting PDO 5: 20000 mV, 3000 mA
[ 6.567665] PD TX, header: 0x1042
[ 6.580208] PD TX complete, status: 0
[ 6.580539] pending state change SNK_NEGOTIATE_CAPABILITIES ->
HARD_RESET_SEND @ 60 ms
[ 6.653644] state change SNK_NEGOTIATE_CAPABILITIES ->
HARD_RESET_SEND [delayed 60 ms]
[ 6.653659] PD TX, type: 0x5
[ 6.684725] PD TX complete, status: 0
[ 6.684783] state change HARD_RESET_SEND -> HARD_RESET_START
[ 6.723530] state change HARD_RESET_START -> SNK_HARD_RESET_SINK_OFF
[ 6.723618] vconn:=0
[ 6.726797] vbus=0 charge:=0
[ 6.727140] Requesting mux mode 1, usb-role 2, orientation 2
[ 6.729300] pending state change SNK_HARD_RESET_SINK_OFF ->
SNK_HARD_RESET_SINK_ON @ 650 ms
[ 6.729333] PD RX, header: 0x363 [1]
[ 6.729358] VBUS off
^^^^^ charger cuts out again later on... probably here?
[ 6.729365] state change SNK_HARD_RESET_SINK_OFF -> SNK_HARD_RESET_WAIT_VBUS
[ 6.729429] pending state change SNK_HARD_RESET_WAIT_VBUS ->
SNK_UNATTACHED @ 1275 ms
[ 8.083161] state change SNK_HARD_RESET_WAIT_VBUS -> SNK_UNATTACHED
[delayed 1275 ms]
[ 8.104897] Setting voltage/current limit 0 mV 0 mA
[ 8.104947] polarity 0
[ 8.104956] Requesting mux mode 0, usb-role 0, orientation 0
[ 8.106435] Start DRP toggling
[ 8.123195] state change SNK_UNATTACHED -> DRP_TOGGLING
[ 8.143793] CC1: 0 -> 0, CC2: 5 -> 5 [state DRP_TOGGLING, polarity
0, connected]
[ 8.143807] state change DRP_TOGGLING -> SNK_ATTACH_WAIT
[ 8.143862] pending state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED @ 200 ms
[ 8.353141] state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED [delayed 200 ms]
[ 8.353159] pending state change SNK_DEBOUNCED -> PORT_RESET @ 480 ms
[ 8.843153] state change SNK_DEBOUNCED -> PORT_RESET [delayed 480 ms]
[ 8.851177] Setting voltage/current limit 0 mV 0 mA
[ 8.851227] polarity 0
[ 8.851235] Requesting mux mode 0, usb-role 0, orientation 0
[ 8.855374] cc:=0
[ 8.862428] pending state change PORT_RESET -> PORT_RESET_WAIT_OFF @ 100 ms
[ 8.963228] state change PORT_RESET -> PORT_RESET_WAIT_OFF [delayed 100 ms]
[ 8.963263] state change PORT_RESET_WAIT_OFF -> SNK_UNATTACHED
[ 8.963279] Start DRP toggling
[ 8.971887] state change SNK_UNATTACHED -> DRP_TOGGLING
[ 8.995761] CC1: 0 -> 0, CC2: 5 -> 5 [state DRP_TOGGLING, polarity
0, connected]
[ 8.995786] state change DRP_TOGGLING -> SNK_ATTACH_WAIT
[ 8.995915] pending state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED @ 200 ms
[ 9.203272] state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED [delayed 200 ms]
[ 9.203305] pending state change SNK_DEBOUNCED -> PORT_RESET @ 480 ms
[ 9.559888] VBUS on
[ 9.559906] state change SNK_DEBOUNCED -> SNK_ATTACHED
[ 9.560039] polarity 1
[ 9.560055] Requesting mux mode 1, usb-role 2, orientation 2
[ 9.561580] state change SNK_ATTACHED -> SNK_STARTUP
[ 9.561596] state change SNK_STARTUP -> SNK_DISCOVERY
[ 9.561611] Setting voltage/current limit 5000 mV 3000 mA
[ 9.561696] vbus=0 charge:=1
[ 9.562129] state change SNK_DISCOVERY -> SNK_WAIT_CAPABILITIES
[ 9.573575] pending state change SNK_WAIT_CAPABILITIES ->
HARD_RESET_SEND @ 240 ms
[ 9.608966] PD RX, header: 0x6161 [1]
[ 9.609017] PDO 0: type 0, 5000 mV, 3000 mA [E]
[ 9.609037] PDO 1: type 0, 9000 mV, 3000 mA []
[ 9.609055] PDO 2: type 0, 12000 mV, 3000 mA []
[ 9.609073] PDO 3: type 0, 15000 mV, 3000 mA []
[ 9.609091] PDO 4: type 0, 18000 mV, 3000 mA []
[ 9.609108] PDO 5: type 0, 20000 mV, 3000 mA []
[ 9.609122] state change SNK_WAIT_CAPABILITIES -> SNK_NEGOTIATE_CAPABILITIES
[ 9.609194] cc=0 cc1=0 cc2=5 vbus=0 vconn=sink polarity=1
[ 9.609216] Requesting PDO 5: 20000 mV, 3000 mA
[ 9.609232] PD TX, header: 0x1042
[ 9.620508] PD TX complete, status: 0
[ 9.620602] pending state change SNK_NEGOTIATE_CAPABILITIES ->
HARD_RESET_SEND @ 60 ms
[ 9.623755] PD RX, header: 0x363 [1]
[ 9.623778] state change SNK_NEGOTIATE_CAPABILITIES -> SNK_TRANSITION_SINK
[ 9.623843] pending state change SNK_TRANSITION_SINK ->
HARD_RESET_SEND @ 500 ms
[ 9.677452] PD RX, header: 0x566 [1]
[ 9.677476] Setting voltage/current limit 20000 mV 3000 mA
[ 9.678596] state change SNK_TRANSITION_SINK -> SNK_READY
Any idea what's causing the VUSB to momentarily cut out during the
transition from 5V to 20V here? I have not yet tested with other
chargers and I'm still digging through documents like the USB-PD spec
[1] to understand the seemingly complex spec and state machine.
Regards,
Tim
[1] http://composter.com.ua/documents/Power-Delivery-Specification.pdf
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