> -----Original Message----- > From: Fabio Estevam [mailto:[email protected]] > Sent: Wednesday, December 30, 2015 7:34 PM > To: [email protected] > Cc: Peter Chen <[email protected]>; [email protected]; linux- > [email protected]; Fabio Estevam <[email protected]> > Subject: [PATCH] usb: phy: mxs: Suggest passing "usbcore.autosuspend=-1" for > mx23/mx28 > > From: Fabio Estevam <[email protected]> > > On a mx28 board with a USB hub the following error is observed: > > hub 1-1:1.0: USB hub found > hub 1-1:1.0: 2 ports detected > usb 1-1: USB disconnect, device number 2 usb usb1-port1: cannot reset (err = - > 32) usb usb1-port1: cannot reset (err = -32) usb usb1-port1: cannot reset > (err = > -32) usb usb1-port1: cannot reset (err = -32) usb usb1-port1: cannot reset > (err = > -32) usb usb1-port1: Cannot enable. Maybe the USB cable is bad? > > ,which is caused by a problem described by the > MXS_PHY_ABNORMAL_IN_SUSPEND flag. > > As we currently do not have a proper implementation for this issue, one > possible workaround is to pass "usbcore.autosuspend=-1" in the kernel > command line, so add this suggestion into the > MXS_PHY_ABNORMAL_IN_SUSPEND flag description. > > Signed-off-by: Fabio Estevam <[email protected]> > --- > drivers/usb/phy/phy-mxs-usb.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c > index c2936dc..453a5ab 100644 > --- a/drivers/usb/phy/phy-mxs-usb.c > +++ b/drivers/usb/phy/phy-mxs-usb.c > @@ -98,6 +98,10 @@ > * The PHY will be in messy if there is a wakeup after putting > * bus to suspend (set portsc.suspendM) but before setting PHY to low > * power mode (set portsc.phcd). > + * > + * To work around this problem on mx23/mx28 user should pass > + * "usbcore.autosuspend=-1" in the kernel command line for now, as > + * we do not have a proper fix for this flag in the kernel yet. > */ > #define MXS_PHY_ABNORMAL_IN_SUSPEND BIT(1) > > -- > 1.9.1
Acked-by: Peter Chen <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
