linux-kernel - Re: [PATCH v2] usb: dwc2: add bus suspend/resume for dwc2

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Date:	Thu, 6 Nov 2014 11:40:11 -0600
From:	Felipe Balbi <balbi@...com>
To:	Romain Perier <romain.perier@...il.com>
CC:	Kever Yang <kever.yang@...k-chips.com>,
	Paul Zimmerman <paulz@...opsys.com>,
	Felipe Balbi <balbi@...com>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	Heiko Stuebner <heiko@...ech.de>, <dianders@...omium.org>,
	<sonnyrao@...omium.org>, <addy.ke@...k-chips.com>,
	Eddie Cai <cf@...k-chips.com>, <xjq@...k-chips.com>,
	<hj@...k-chips.com>, <dkl@...k-chips.com>,
	<huangtao@...k-chips.com>, <linux-rockchip@...ts.infradead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] usb: dwc2: add bus suspend/resume for dwc2

On Thu, Nov 06, 2014 at 06:21:42PM +0100, Romain Perier wrote:
> Hi Kever,
> 
> 
> 2014-11-06 2:30 GMT+01:00 Kever Yang <kever.yang@...k-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.

-- 
balbi

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