linux-kernel - Re: Commit 500f7147cf5bafd139056d521536b10c2bc2e154 breaks _resume

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Message-ID: <s5hsjw0uswl.wl%tiwai@suse.de>
Date:	Mon, 07 Feb 2011 09:54:02 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Jeff Chua <jeff.chua.linux@...il.com>
Cc:	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 16:45:16 +0800,
Jeff Chua wrote:
> 
> On Mon, Feb 7, 2011 at 4:36 PM, Jeff Chua <jeff.chua.linux@...il.com> wrote:
> > On Mon, Feb 7, 2011 at 4:25 PM, Takashi Iwai <tiwai@...e.de> wrote:
> >> 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.
> >
> > In case I'm messing something up, here's my intel_display.c
> 
> Why not just pass intel_crtc as in
> 
> - static void intel_crtc_reset(struct drm_crtc *crtc)
> + static void intel_crtc_reset(struct intel_crtc *intel_crtc)

Because it's called from drm_crtc.c that has no idea about the
driver-local type :)


Takashi
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