Messages in this thread | | | From | Peter Chen <> | Subject | Re: [PATCH] usb: cdns3: gadget: Don't manage pullups | Date | Tue, 29 Oct 2019 03:12:34 +0000 |
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On 19-10-25 12:59:17, Roger Quadros wrote: > Peter, > > On 25/10/2019 06:13, Peter Chen wrote: > > On 19-10-23 09:17:45, Pawel Laszczak wrote: > > > Hi, > > > > > > Reviewed-by: Pawel Laszczak <pawell@cadence.com> > > > > Hi Roger & Pawel, > > > > Assume gadget function has already enabled, if you switch host mode > > to device mode, with your changes, where the device mode will be enabled > > again? > > When it switches from device mode to host the UDC is removed. When we switch > back from host to device mode the UDC is added, so, > > usb_add_gadget_udc_release()-> check_pending_gadget_drivers()-> > udc_bind_to_driver()->usb_udc_connect_control()->usb_gadget_connect()-> > gadget->ops->pullup()
Thanks. I have another question how you decide when to store UDC name to /sys/kernel/config/usb_gadget/g1/UDC? Do you have a user daemon program to monitor VBUS or external connector? At host mode, the store operation will fail due to there is NO UDC.
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Thanks, Peter Chen
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