linux-kernel - Re: Commit 500f7147cf5bafd139056d521536b10c2bc2e154 breaks _resume

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Date:	Mon, 07 Feb 2011 11:06:45 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Marc Koschewski <marc@...nowledge.org>
Cc:	Jeff Chua <jeff.chua.linux@...il.com>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Commit 500f7147cf5bafd139056d521536b10c2bc2e154 breaks _resume_

At Mon, 7 Feb 2011 11:02:10 +0100,
Marc Koschewski wrote:
> 
> Takashi,
> 
> is this potentially breaking S3 resume with nouveau cards, too?

There is no reset callback except for i915, so there shouldn't be any
change for nouveau regarding these commits.


Takashi

> Regards,
> Marc
> 
> * Takashi Iwai <tiwai@...e.de> [2011-02-07 09:25:42 +0100]:
> 
> > At Mon, 7 Feb 2011 13:02:46 +0800,
> > Jeff Chua wrote:
> > > 
> > > On Mon, Feb 7, 2011 at 12:48 PM, Jeff Chua <jeff.chua.linux@...il.com> wrote:
> > > > On Sun, Feb 6, 2011 at 11:27 PM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
> > > >> One last step: move contents of intel_crtc_reset() back to
> > > >> intel_crtc_init() one by one.
> > > >>
> > > >> The active flag is my suspicion. I was thinking that we brought up the
> > > >> outputs in a similar manner upon resume as upon initial boot. On
> > > >> reflection, this is the not case.
> > > >>
> > > >> However, the first action we take inside modesetting is to disable the
> > > >> outputs about to be reconfigured. So setting active should be the right
> > > >> course of action so that cleanup any residual state from resume.
> > > >>
> > > >> So I am intrigued as to which line is the cause, and just where the
> > > >> machine becomes unresponsive...
> > > >
> > > > It's this line causing the problem.
> > > >
> > > > intel_crtc->active = true; /* force the pipe off on setup_init_config */
> > > >
> > > >
> > > > When it's called before entering intel_crtc_reset(&intel_crtc->base),
> > > > it works, but if called within the function, it doesn't work. Strange.
> > > > Not sure whether is passing the correct value to to_intel_crtc(crtc)?
> > > 
> > > I've added printk() below and the function returns a different value
> > > of intel_crtc.
> > > 
> > > 
> > > static void intel_crtc_reset(struct drm_crtc *crtc)
> > > {
> > >         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> > >         printk("intel_crtc %p\n", intel_crtc); ===> intel_crtc ffff8802349d1000
> > > 
> > > }
> > > 
> > > printk("intel_crtc %p\n", intel_crtc); ===> intel_crtc ffff8802349d0000
> > > intel_crtc_reset(&intel_crtc->base);
> > 
> > That's weird.  Since base is the first member, both intel_crtc and crtc
> > must be identical.
> > 
> > 
> > Takashi
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> > Please read the FAQ at  http://www.tux.org/lkml/
> > 
> > 
> 
> -- 
> Marc Koschewski
> 
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