Documentation: usb: chipidea: Update test procedure for HNP polling (dfbae330) · Commits · 戴 / test

Documentation/usb/chipidea.txt

+5 −4

Original line number	Original line	Diff line number	Diff line
	@@ -26,16 +26,17 @@ cat /sys/kernel/debug/ci_hdrc.0/registers
	On B-device:		On B-device:
	echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req		echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req

	if HNP polling is not supported, also need:
	On A-device:
	echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req

	B-device should take host role and enumrate A-device.		B-device should take host role and enumrate A-device.

	4) A-device switch back to host.		4) A-device switch back to host.
	On B-device:		On B-device:
	echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req		echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req

			or, by introducing HNP polling, B-Host can know when A-peripheral wish
			to be host role, so this role switch also can be trigged in A-peripheral
			side by answering the polling from B-Host, this can be done on A-device:
			echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req

	A-device should switch back to host and enumrate B-device.		A-device should switch back to host and enumrate B-device.

	5) Remove B-device(unplug micro B plug) and insert again in 10 seconds,		5) Remove B-device(unplug micro B plug) and insert again in 10 seconds,