On Thu, Apr 30, 2015 at 04:46:01PM +0800, Peter Chen wrote: > On Tue, Apr 28, 2015 at 11:56:27AM -0500, Felipe Balbi wrote: > > On Thu, Mar 19, 2015 at 11:11:25AM +0800, Li Jun wrote: > > > From: Li Jun <b47624@xxxxxxxxxxxxx> > > > > > > Update HNP test procedure as HNP polling is supported. > > > > > > Signed-off-by: Li Jun <jun.li@xxxxxxxxxxxxx> > > > --- > > > Documentation/usb/chipidea.txt | 11 ++++++----- > > > 1 file changed, 6 insertions(+), 5 deletions(-) > > > > > > diff --git a/Documentation/usb/chipidea.txt b/Documentation/usb/chipidea.txt > > > index 3f848c1..ff965b2 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: > > > + 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 > > > > why is this still chipidea specific ? Why isn't this part on udc-core so > > that all OTG UDCs can support this too ? > > > > Currently, hnp polling is enabled during the otg fsm handling, but there > is no otg framework (like udc core, Roger Quadros is doing that), so > no common sys entry for otg fsm variables to control otg fsm. then we wait for whatever Roger's doing, otherwise this will be another ABI to support forever. -- balbi
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