linux-kernel - Re: [RFC] full suspend/resume support for i915 DRM driver

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Message-ID: <20071024133514.GB4898@ucw.cz>
Date:	Wed, 24 Oct 2007 13:35:14 +0000
From:	Pavel Machek <pavel@....cz>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	dri-devel@...ts.sf.net, linux-kernel@...r.kernel.org
Subject: Re: [RFC] full suspend/resume support for i915 DRM driver

Hi!

> We seem to see a lot of bug reports along the lines of, "my machine
> resumes but I can't see X" or, "I can see X but only with a bright
> flashlight", etc.  These sorts of problems are due to the fact that
> the X server isn't designed to do full state save/restore, and none
> of the available kernel drivers do it on its behalf.
> 
> Since intelfb and the rest of the Intel drivers are fairly incompatible,
> this patch makes the DRM bind to the PCI device so it can register real
> suspend/resume handlers.  Those handlers take care of saving and
> restoring enough state for X to come back reliably on at least one of my
> problematic test machines, but text mode still has trouble (still
> debugging VGA state save/restore, including trying to save/restore
> actual VRAM contents for possible hibernate support).
> 
> How does this approach look?  Is a new DRM driver flag a good thing for
> similar situations with other drivers?  Thoughts?

Looks okay to me... from very quick look.

> +	if (!i915_pipe_enabled(dev, pipe))
> +		return;
> +
> +	if (pipe == PIPE_A)
> +		array = dev_priv->savePaletteA;


coding style, we probably want save_palette_A.

> +	unsigned long reg = pipe == PIPE_A ? PALETTE_A : PALETTE_B;

Uff. Mixing = and == and ? in one expression is evil.

I think I seen some #if 0 code.... just remove that.
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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