linux-kernel - Re: [PATCH 6/6] PM/FB/gxfb: add config option that allows disabling of VT switch during suspend

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Date:	Mon, 10 Mar 2008 16:37:44 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Andres Salomon <dilinger@...ued.net>, adaplas@...il.com,
	linux-kernel@...r.kernel.org,
	linux-fbdev-devel@...ts.sourceforge.net, info-linux@...de.amd.com,
	jordan.crouse@....com, samuel.thibault@...-lyon.org,
	Pavel Machek <pavel@....cz>
Subject: Re: [PATCH 6/6] PM/FB/gxfb: add config option that allows disabling
 of VT switch during suspend

On Mon, 10 Mar 2008 23:28:18 +0100 "Rafael J. Wysocki" <rjw@...k.pl> wrote:

> > > > If so, that means extra #ifdef's sprinkled throughout the code.  Note
> > > > that most framebuffer drivers won't be supporting this, and those that
> > > > do will almost certainly always want vt switching turned off..
> > > > 
> > > 
> > > I don't think you need any ifdefs or config options at all, do you?  Just
> > > add a new module parameter to this driver and some little interface into
> > > the PM core which allows the driver to set no_vt_switch?
> > > 
> > 
> > That's a possibility, but doesn't adding hooks into PM core for two
> > drivers (lxfb and gxfb) seems like overkill?  I also don't really see
> > anyone needing to switch back and forth between VT_SWITCH and
> > NO_VT_SWITCH other than to work around possible bugs in the register
> > save/restore code..
> 
> FWIW, I prefer the original .config option idea.

Please explain your reasoning?
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