On Mon, Jun 29, 2020 at 2:04 PM Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx> wrote: > > A SuperSpeed device shall include the USB 2.0 extension descriptor > and shall support LPM when operating in USB 2.0 HS mode(see usb3.2 > spec9.6.2.1). But we always don't support it, so disable it by > default, otherwise device will enter LPM suspend mode when > connected to Win10 system. Linux also supports USB2 LPM. Besides, USB-IF CH9 test will check LPM support if the device is USB 2.1, how could you deal with it? Peter > > Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx> > --- > drivers/usb/mtu3/mtu3_core.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/usb/mtu3/mtu3_core.c b/drivers/usb/mtu3/mtu3_core.c > index 9dd0216..50d6a40 100644 > --- a/drivers/usb/mtu3/mtu3_core.c > +++ b/drivers/usb/mtu3/mtu3_core.c > @@ -604,6 +604,8 @@ static void mtu3_regs_init(struct mtu3 *mtu) > mtu3_clrbits(mbase, U3D_MISC_CTRL, VBUS_FRC_EN | VBUS_ON); > /* enable automatical HWRW from L1 */ > mtu3_setbits(mbase, U3D_POWER_MANAGEMENT, LPM_HRWE); > + /* always reject LPM request */ > + mtu3_setbits(mbase, U3D_POWER_MANAGEMENT, LPM_MODE(1)); > > /* use new QMU format when HW version >= 0x1003 */ > if (mtu->gen2cp) > -- > 1.9.1 > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
