linux-kernel - Re: Questions about Runtime Power Management

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Date:	Mon, 17 Jun 2013 00:15:30 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	"Morales, Alejandra" <alejandra.morales@....de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Questions about Runtime Power Management

On Sunday 16 June 2013 23:07:36 Ming Lei wrote:
> On Mon, Jun 10, 2013 at 12:28 AM, Morales, Alejandra
> <alejandra.morales@....de> wrote:
> 
> > - Is runtime power management supported by net devices?
> 
> Currently, 'struct net_device' doesn't support runtime power management,
> and I submitted one patch to add the support for solving accessing
> suspended device by 'ethtool', but it was rejected.
> 
>               http://marc.info/?t=135054860600003&r=1&w=2

And the discussion is still useful and true.

> But the physical device of the net device can support runtime PM, for example,
> some PCIe network devices support runtime PM on link change, and usbnet
> devices support auto suspend.

There is a design behind runtime PM. Runtime PM is involved if a device looses
capabilities in a power saving state. Or if it is a dependency among runtime PM
of devices. Therefore it is not used for things like Energy Efficient Ethernet.

	Regards
		Oliver

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