On Tue, Sep 11, 2018 at 5:39 PM Nicolas Adell <nicolas.adell@xxxxxxxx> wrote:
>
> On Thursday 30 Aug 2018 à 16:44:01 (+0800), Peter Chen wrote:
> > On Wed, Aug 29, 2018 at 8:22 PM Nicolas Adell <nicolas.adell@xxxxxxxx>
> > wrote:
> >
> > > On Wednesday 29 Aug 2018 ą 17:37:19 (+0800), Peter Chen wrote:
> > > > On Mon, Aug 27, 2018 at 10:01 PM Nicolas Adell <nicolas.adell@xxxxxxxx>
> > > > wrote:
> > > >
> > > > > When initializing the USB subsystem before starting the kernel,
> > > > > OTG overcurrent detection is disabled. In case the OTG polarity of
> > > > > overcurrent is low active, the overcurrent detection is never enabled
> > > > > again and events cannot be reported as expected. Because imx usb
> > > > > overcurrent polarity is low active by default, only detection needs
> > > > > to be enable in usbmisc init function.
> > > > >
> > > > > Signed-off-by: Nicolas Adell <nicolas.adell@xxxxxxxx>
> > > > > ---
> > > > > drivers/usb/chipidea/usbmisc_imx.c | 2 ++
> > > > > 1 file changed, 2 insertions(+)
> > > > >
> > > > > diff --git a/drivers/usb/chipidea/usbmisc_imx.c
> > > > > b/drivers/usb/chipidea/usbmisc_imx.c
> > > > > index 34ad5bf..424ecb1 100644
> > > > > --- a/drivers/usb/chipidea/usbmisc_imx.c
> > > > > +++ b/drivers/usb/chipidea/usbmisc_imx.c
> > > > > @@ -343,6 +343,8 @@ static int usbmisc_imx6q_init(struct
> > > imx_usbmisc_data
> > > > > *data)
> > > > > } else if (data->oc_polarity == 1) {
> > > > > /* High active */
> > > > > reg &= ~(MX6_BM_OVER_CUR_DIS |
> > > MX6_BM_OVER_CUR_POLARITY);
> > > > > + } else {
> > > > > + reg &= ~(MX6_BM_OVER_CUR_DIS);
> > > > > }
> > > > > writel(reg, usbmisc->base + data->index * 4);
> > > > >
> > > > >
> > > > The Over-Current detection is enabled by default for imx6, is it not true
> > > > for your system?
> > > >
> > > > Peter
> > >
> > > Indeed, overcurrent detection is enabled by default.
> > > But the issue appeared when I have had to enable USB subsystem in u-boot,
> > > using
> > > 'usb start' command, in order to boot over an USB ethernet dongle.
> > > In this specific case, the detection was disabled and never enabled again.
> > >
> > >
> > Get it ,will apply it.
> >
> > Thanks.
> Hi Peter,
>
> Because patch has not been integrated yet,
> did you succeed in reproducing the issue ?
>
> Thanks.
> >
> >
> > > Nicolas
> > >
It is already at my next tree, will send to Greg for next rc1 in future.
https://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/usb.git/commit/?h=ci-for-usb-next&id=1657ebedd025fcf93c9e7ac6c8adda400774f955
Peter
