From: Fabio Estevam <fabio.estevam@xxxxxxx> 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 <fabio.estevam@xxxxxxx> Acked-by: Peter Chen <peter.chen@xxxxxxx> --- 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 00bfea0..be46ab3 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 -- 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
