From mboxrd@z Thu Jan 1 00:00:00 1970 From: marex@denx.de (Marek Vasut) Date: Tue, 9 Jul 2013 12:38:44 +0200 Subject: Chipidea usb otg support for IMX/MXS (device functionality) In-Reply-To: References: <51A5A808.2070803@digi.com> <201307082256.38642.marex@denx.de> Message-ID: <201307091238.45019.marex@denx.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi Peter, [...] > > It needs to check your hardware, it is probably there is a high capacitance > at vbus pin. Besides, the vbus should be lower than 0.8v if it is > disconnected from pc. I just wonder why I can no longer use device mode only after I plug in the adaptor for host device. Before that, I can plug in the device mode cable from PC all I want and this works. Then I plug in the host adaptor, that works as well , but if I plug in the device cable, this works no longer. I rather suspect it might be something going on in the driver that's not right. I will check the hardware too, thanks. Best regards, Marek Vasut