From dfbae3309568f296e5dccfe1ec10db0f6804b756 Mon Sep 17 00:00:00 2001 From: Li Jun Date: Fri, 19 Feb 2016 10:04:47 +0800 Subject: [PATCH] Documentation: usb: chipidea: Update test procedure for HNP polling Update HNP test procedure as HNP polling is supported. Acked-by: Peter Chen Signed-off-by: Li Jun Signed-off-by: Felipe Balbi --- Documentation/usb/chipidea.txt | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/Documentation/usb/chipidea.txt b/Documentation/usb/chipidea.txt index 05f735a1b5a5..678741b0f213 100644 --- a/Documentation/usb/chipidea.txt +++ b/Documentation/usb/chipidea.txt @@ -26,16 +26,17 @@ cat /sys/kernel/debug/ci_hdrc.0/registers On B-device: 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. 4) A-device switch back to host. On B-device: 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. 5) Remove B-device(unplug micro B plug) and insert again in 10 seconds, -- 2.20.1