linux-kernel - Re: [Linux-fbdev-devel] Fwd: [Suspend-devel] resume not working on acer ferrari 4005 with radeonfb enabled

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Date:	Thu, 16 Nov 2006 23:17:26 +0100
From:	Christian Hoffmann <chrmhoffmann@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-fbdev-devel@...ts.sourceforge.net,
	Christian Hoffmann <Christian.Hoffmann@...lstreetsystems.com>,
	Andrew Morton <akpm@...l.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Solomon Peachy <pizza@...ftnet.org>,
	Pavel Machek <pavel@....cz>
Subject: Re: [Linux-fbdev-devel] Fwd: [Suspend-devel] resume not working on acer ferrari 4005 with radeonfb enabled


> >
> > Well, if you acquire the console sem you need to release it too :-)
>
> Or the console semaphore is acquired too many times.
>
> Christian, could you please add release_console_sem() before 'return 0'
> and see if that makes the code work again?  If not, could you add a
> printk() in kernel/printk.c/acquire_console_sem() to see how many times it
> is called?

Ok, I did that and the machine resumes OK. Now I have the impression that 
accessing the rinfo struct here:

if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND) {
                /* Wakeup chip. Check from config space if we were powered off
                 * (todo: additionally, check CLK_PIN_CNTL too)
                 */
                if ((rinfo->pm_mode & radeon_pm_off) &&
                        radeon_restore_pci_cfg(rinfo)) {
                        if (rinfo->reinit_func != NULL) {
                                rinfo->reinit_func(rinfo);
                                }
                        else {
                                goto bail;
                        }
                }
                /* If we support D2, try to resume... we should check what was 
our
                 * state though... (were we really in D2 state ?). Right now, 
this code
                 * is only enable on Macs so it's fine.
                 */
                else if (rinfo->pm_mode & radeon_pm_d2){
                        radeon_set_suspend(rinfo, 0);
                }
                rinfo->asleep = 0; ////makes it crash
        } else {
                radeon_engine_idle();
        }

makes the resume fail. The machine locks up. I started xorg without drm/dri 
and then it goes a little further and locks up in the next steps:        

/* Restore display & engine */
radeon_write_mode (rinfo, &rinfo->state, 1);

But it starts to get too complicated for me :(

Chris

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