Re: [PATCH] usb/mtu3: power down device ip at setup

Chunfeng Yun
2018-11-28T07:02:56Z

On Wed, 2018-11-28 at 14:26 +0800, Hsin-Yi Wang wrote:
> Hi Chunfeng,
> On mt8183, We found `ip sleep failed!!!` with powerd_dbus_suspend.
Did you enable usb device mode in BROM or LK stage? e.g. download image
by fastboot / flashtool

> Referenced from xhci, it also power down device ip at
> xhci_mtk_ssusb_config().
It may happen when user downloads images by usb device in LK/BROM stage,
but not disable it before enter kernel stage.

> Also if dr_mode is PERIPHERAL and OTG, they both power down device ip
> at ssusb_gadget_init().
Yes, it tries to save power;
>
> On Wed, Nov 28, 2018 at 2:22 PM Chunfeng Yun
> <chunfeng.yun@mediatek.com> wrote:
>
> Hi Hsin-Yi,
>
> On Wed, 2018-11-28 at 14:04 +0800, Hsin-Yi, Wang wrote:
> > Originally, when dr_mode is USB_DR_MODE_HOST, it didn't
> power down device ip,
> > so host ip sleep will fail at ssusb_host_disable.
> >
> > Power down device ip at ssusb_host_setup.
> >
> > Signed-off-by: Hsin-Yi, Wang <hsinyi@chromium.org>
> > ---
> > drivers/usb/mtu3/mtu3_host.c | 8 ++++++++
> > 1 file changed, 8 insertions(+)
> >
> > diff --git a/drivers/usb/mtu3/mtu3_host.c
> b/drivers/usb/mtu3/mtu3_host.c
> > index c871b94f3e6f..d17cf43305db 100644
> > --- a/drivers/usb/mtu3/mtu3_host.c
> > +++ b/drivers/usb/mtu3/mtu3_host.c
> > @@ -192,9 +192,17 @@ int ssusb_host_disable(struct ssusb_mtk
> *ssusb, bool suspend)
> > static void ssusb_host_setup(struct ssusb_mtk *ssusb)
> > {
> > struct otg_switch_mtk *otg_sx = &ssusb->otg_switch;
> > + void __iomem *ibase = ssusb->ippc_base;
> >
> > host_ports_num_get(ssusb);
> >
> > + /*
> > + * device ip is default power-on in fact
> The device ip is power-off by default, no need power down it
> here.
>
> On which platform did you encounter the issue?
>
> > + * power down device ip, otherwise ip-sleep will fail
> > + */
> > + if (ssusb->dr_mode == USB_DR_MODE_HOST)
> > + mtu3_setbits(ibase, U3D_SSUSB_IP_PW_CTRL2,
> SSUSB_IP_DEV_PDN);
> > +
Could you please put it in ssusb_ip_sw_reset(), after ip reset, in
mtu3_plat.c, if it fix the issue?

> > /*
> > * power on host and power on/enable all ports
> > * if support OTG, gadget driver will switch port0 to
> device mode
>
>