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SubjectRE: [PATCH v2] usb: dwc2: add bus suspend/resume for dwc2
Date
> From: Felipe Balbi [mailto:balbi@ti.com]
> Sent: Thursday, November 06, 2014 9:40 AM
>
> On Thu, Nov 06, 2014 at 06:21:42PM +0100, Romain Perier wrote:
> >
> > 2014-11-06 2:30 GMT+01:00 Kever Yang <kever.yang@rock-chips.com>:
> > >
> > > +static int _dwc2_hcd_suspend(struct usb_hcd *hcd)
> > > +{
> > > + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
> > > + u32 hprt0;
> > > +
> > > + if (!((hsotg->op_state == OTG_STATE_B_HOST) ||
> > > + (hsotg->op_state == OTG_STATE_A_HOST)))
> > > + return 0;
> > > +
> > > + if (hsotg->lx_state != DWC2_L0)
> > > + return 0;
> > > +
> > > + hprt0 = dwc2_read_hprt0(hsotg);
> > > + if (hprt0 & HPRT0_CONNSTS)
> > > + dwc2_port_suspend(hsotg, 1);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int _dwc2_hcd_resume(struct usb_hcd *hcd)
> > > +{
> > > + struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
> > > + u32 hprt0;
> > > +
> > > + if (!((hsotg->op_state == OTG_STATE_B_HOST) ||
> > > + (hsotg->op_state == OTG_STATE_A_HOST)))
> > > + return 0;
> > > +
> > > + if (hsotg->lx_state != DWC2_L2)
> > > + return 0;
> > > +
> > > + hprt0 = dwc2_read_hprt0(hsotg);
> > > + if ((hprt0 & HPRT0_CONNSTS) && (hprt0 & HPRT0_SUSP))
> > > + dwc2_port_resume(hsotg);
> > > +
> > > + return 0;
> > > +}
> >
> > Could you also define these functions under #ifdef CONFIG_PM ?
>
> please don't. I'm actually considering ripping all ifdefs from all these
> drivers and also stop using SIMPLE_DEV_PM_OPS or any of its friends.
>
> There's really nobody today would would build a kernel with CONFIG_PM.

I'm sure Felipe meant *without* CONFIG_PM.

Kever, in that case you should remove the #ifdef CONFIG_PM around the
.bus_suspend and .bus_resume assignments also, otherwise there will be
compiler warnings when built without CONFIG_PM. After that, you can
add my acked-by.

--
Paul



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