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| author | Li Jun <jun.li@nxp.com> | 2016-02-19 10:04:47 +0800 |
|---|---|---|
| committer | Felipe Balbi <balbi@kernel.org> | 2016-03-04 15:14:37 +0200 |
| commit | dfbae3309568f296e5dccfe1ec10db0f6804b756 (patch) | |
| tree | 313cc86f04723b547d3bb456e2f194041b55f6e0 /Documentation/usb | |
| parent | 75d2f754e2d8937890336803ae27e3503f192705 (diff) | |
| download | lwn-dfbae3309568f296e5dccfe1ec10db0f6804b756.tar.gz lwn-dfbae3309568f296e5dccfe1ec10db0f6804b756.zip | |
Documentation: usb: chipidea: Update test procedure for HNP polling
Update HNP test procedure as HNP polling is supported.
Acked-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Li Jun <jun.li@nxp.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Diffstat (limited to 'Documentation/usb')
| -rw-r--r-- | Documentation/usb/chipidea.txt | 9 |
1 files 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, |