On Thu, Jul 03, 2014 at 01:19:21AM +0000, Peter Chen wrote: > > > > > Is it possible to get the chipidea to generate an event on udc unplugging? > > > > Yes, it has already implemented at ci_usc_vbus_session. > > > I see the code path in ci_udc_vbus_session of udc.c to trigger such an > > event, but unfortunately it was never possible to run into that code. > > > > The function ci_otg_work in otg.c is prepared to do that in case the irq > > got triggered by OTGSC_BSVIS bit change. > > > > This is true for plugging, but never happened to be called on unplugging. > > Is there anything missing to get this working? Or is this completely > > impossible by the core? I was already fiddling around with the other irq > > cases OTGSC_*IE, but never got anything useful. > > Once the vbus lower than B_SESSION_VALID, it will trigger (set OTGSC_BSVIS too) > BSV interrupt. By theory! ;) > Check your vbus after unplugging please. Today I measured the voltage level on vbus and it still had ~2.6V while being not connected to anything. > > I am working on the imx25 otg capable SoC. I validated this with two different imx25 boards and realized, that we have this external vbus divider errata for that SoC. Errata: ENGcm09152 Its likely that the issue is related to this problem as the vbus was not connected to anything different, than the SoC in that case. Regards, Michael -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
