On Mon, 2020-06-29 at 15:37 +0800, Peter Chen wrote: > 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? Indeed need support it for SS device, I'll check it again, thanks a lot > > 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
