linux-kernel - Re: Commit 500f7147cf5bafd139056d521536b10c2bc2e154 breaks _resume

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Message-ID: <20110207100210.GB12725@marc.osknowledge.org>
Date:	Mon, 7 Feb 2011 11:02:10 +0100
From:	Marc Koschewski <marc@...nowledge.org>
To:	Takashi Iwai <tiwai@...e.de>
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_

Takashi,

is this potentially breaking S3 resume with nouveau cards, too?

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
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> 

-- 
Marc Koschewski
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