linux-kernel - Re: NAK new drivers without proper power management?

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Date:	Sun, 11 Feb 2007 01:27:34 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Tilman Schmidt <tilman@...p.cc>
Cc:	nigel@...el.suspend2.net, Pavel Machek <pavel@....cz>,
	Arjan van de Ven <arjan@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: NAK new drivers without proper power management?

On Sunday, 11 February 2007 00:45, Tilman Schmidt wrote:
> Am 10.02.2007 23:37 schrieb Nigel Cunningham:
> > If your device requires power management, and you know it requires power
> > management, why not just implement power management? Doing -ENOSYS
> > instead is like saying -ESPAMMEBECAUSEIMLAZY.
> 
> Like it or not, power management is far from trivial, and people
> writing device drivers have limited resources. Calling them lazy
> does not help that in the least. If you try to put pressure on them
> by refusing to merge their work as long as it doesn't provide this
> or that functionality, you *may* end up with a few drivers having
> that functionality which otherwise wouldn't, but you *will* also
> end up with a number of drivers never making it into the kernel
> because their authors just have to give up.
> 
> Also, in your argument you neglected a few cases:
> - What if my device does not require power management?
> - What if I don't know whether my device requires power management?
> - What if I know my device would require power management, but don't
>   know how to implement it?

Plus:
- What if I'm planning to implement the power managemet, but not just right
now?
 
> > Let me put it another way: People keep talking about Linux being ready
> > for the desktop. To me at least (but I dare say for lots of other people
> > too), being ready for the desktop means that things just work, without
> > having to recompile kernels or bug driver authors or wait twelve
> > months. 
> 
> Exactly.
> 
> > And it means that doing a bare minimum isn't enough. We keep claiming
> > that Open Source is better than Proprietary software. If we accept
> > half-pie jobs of implementing support for anything - driver power
> > management support or hibernation support or whatever - as 'good
> > enough', we're undercutting that argument. Linux's power management
> > support should - as far as we're able - be at least as good as that
> > other operating system's and preferably way, way better.
> > 
> > -ENOSYS is just not acceptable.
> 
> Your argument falls down the moment you consider the alternative:
> not merging the driver means that the device won't work at all.
> (Given that out-of-tree drivers are actively discouraged, to put
> it mildly.) That's arguably farther from "desktop readiness" than
> a device not supporting power management.

Agreed.

Greetings,
Rafael
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