linux-kernel - Re: [PATCH v3] Gigabit Ethernet driver of Topcliff PCH

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Date:	Mon, 13 Sep 2010 00:19:26 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Masayuki Ohtake <masa-korg@....okisemi.com>,
	"David S. Miller" <davem@...emloft.net>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	John Linn <john.linn@...inx.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Kristoffer Glembo <kristoffer@...sler.com>,
	Maxime Bizon <mbizon@...ebox.fr>,
	Greg Rose <gregory.v.rose@...el.com>,
	ML netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, MeeGo <meego-dev@...go.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	"Wang, Qi" <qi.wang@...el.com>,
	"Wang, Yong Y" <yong.y.wang@...el.com>,
	Andrew <andrew.chih.howe.khor@...el.com>,
	Intel OTC <joel.clark@...el.com>,
	"Foster, Margie" <margie.foster@...el.com>,
	Arjan <arjan@...ux.intel.com>,
	Toshiharu Okada <okada533@....okisemi.com>,
	Takahiro Shimizu <shimizu394@....okisemi.com>,
	Tomoya Morinaga <morinaga526@....okisemi.com>
Subject: Re: [PATCH v3] Gigabit Ethernet driver of Topcliff PCH

On Friday, September 10, 2010, Rafael J. Wysocki wrote:
> On Friday, September 10, 2010, Jiri Slaby wrote:
> > Ccing Rafael (please find pch_gbe_resume here)

Thanks.

...
> > 
> > > +#ifdef CONFIG_PM
> > > +static int pch_gbe_resume(struct pci_dev *pdev)
> > > +{
> > > +	struct net_device *netdev = pci_get_drvdata(pdev);
> > > +	struct pch_gbe_adapter *adapter = netdev_priv(netdev);
> > > +	struct pch_gbe_hw *hw = &adapter->hw;
> > > +	u32 err;
> > > +
> > > +	pci_enable_wake(pdev, PCI_D0, 0);
> > > +	pci_set_power_state(pdev, PCI_D0);
> > > +	pci_restore_state(pdev);
> > > +	err = pci_enable_device(pdev);
> > > +	if (err) {
> > > +		pr_err("Cannot enable PCI device from suspend\n");
> > > +		return err;
> > > +	}
> > > +	pci_set_master(pdev);
> > 
> > Not sure which of those you need. Rafael may tell you more. You should
> > not set power state and restore state, but I might be wrong.

You're basically right.  In fact you're supposed to use struct dev_pm_ops
for defining PM callbacks and then you don't need do any PCI-specific
operations directly in the driver.

All of this is described in detail in Documentation/power/pci.txt and you
can have a look into r8169.c for a reference implementation.

Thanks,
Rafael
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