linux-kernel - Re: [Suspend-devel] 2.6.25-rc2 System no longer powers off after suspend-to-disk. Screen becomes green.

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Date:	Thu, 21 Feb 2008 23:11:43 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jesse Barnes <jesse.barnes@...el.com>
Cc:	"Jeff Chua" <jeff.chua.linux@...il.com>,
	Dave Airlie <airlied@...ux.ie>, Greg KH <gregkh@...e.de>,
	lkml <linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [Suspend-devel] 2.6.25-rc2 System no longer powers off after suspend-to-disk. Screen becomes green.

On Thursday, 21 of February 2008, Jesse Barnes wrote:
> On Thursday, February 21, 2008 8:27 am Rafael J. Wysocki wrote:
> > On Thursday, 21 of February 2008, Jeff Chua wrote:
> > > On Thu, Feb 21, 2008 at 8:39 AM, Jesse Barnes <jesse.barnes@...el.com> 
> wrote:
> > > > On Wednesday, February 20, 2008 4:35 pm Jeff Chua wrote:
> > > >  > On Thu, Feb 21, 2008 at 5:37 AM, Jesse Barnes
> > > >  > <jesse.barnes@...el.com>
> > > >
> > > >  wrote:
> > > >  > >  Ok, can you give this patch a try with the 'platform' method?  It
> > > >  > > should at least tell us what ACPI would like the device to do at
> > > >  > > suspend time, but it probably won't fix the hang.
> > >
> > > It says "calling pci_set_power_state with 3". Then after all then it
> > > still hangs, and then resume with Mr Green.
> > >
> > > PM: Syncing filesystems ... done.
> > > Freezing user space processes ... (elapsed 0.00 seconds) done.
> > > Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
> > > PM: Shrinking memory...  ^H-^Hdone (0 pages freed)
> > > PM: Freed 0 kbytes in 0.20 seconds (0.00 MB/s)
> > > ACPI: Preparing to enter system sleep state S4
> > > Suspending console(s)
> > > sd 0:0:0:0: [sda] Synchronizing SCSI cache
> > > drm_sysfs_suspend
> > > ACPI: PCI interrupt for device 0000:00:02.0 disabled
> > > calling pci_set_power_state with 3
> >
> > So it returns the right value.
> >
> > Jeff, Jesse, please check one thing for me.

Below is a patch that should work around the issue.  Please try it and let me
know if it helps.

Thanks,
Rafael

---
 drivers/char/drm/i915_drv.c |    3 +++
 include/linux/suspend.h     |    2 ++
 kernel/power/disk.c         |    9 ++++++++-
 3 files changed, 13 insertions(+), 1 deletion(-)

Index: linux-2.6/include/linux/suspend.h
===================================================================
--- linux-2.6.orig/include/linux/suspend.h
+++ linux-2.6/include/linux/suspend.h
@@ -209,6 +209,7 @@ extern unsigned long get_safe_page(gfp_t
 
 extern void hibernation_set_ops(struct platform_hibernation_ops *ops);
 extern int hibernate(void);
+extern bool in_hibernation_power_off(void);
 #else /* CONFIG_HIBERNATION */
 static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
 static inline void swsusp_set_page_free(struct page *p) {}
@@ -216,6 +217,7 @@ static inline void swsusp_unset_page_fre
 
 static inline void hibernation_set_ops(struct platform_hibernation_ops *ops) {}
 static inline int hibernate(void) { return -ENOSYS; }
+static inline bool in_hibernation_power_off(void) { return false; }
 #endif /* CONFIG_HIBERNATION */
 
 #ifdef CONFIG_PM_SLEEP
Index: linux-2.6/kernel/power/disk.c
===================================================================
--- linux-2.6.orig/kernel/power/disk.c
+++ linux-2.6/kernel/power/disk.c
@@ -24,7 +24,7 @@
 
 #include "power.h"
 
-
+static bool entering_sleep_state;
 static int noresume = 0;
 static char resume_file[256] = CONFIG_PM_STD_PARTITION;
 dev_t swsusp_resume_device;
@@ -381,6 +381,7 @@ int hibernation_platform_enter(void)
 	if (!hibernation_ops)
 		return -ENOSYS;
 
+	entering_sleep_state = true;
 	/*
 	 * We have cancelled the power transition by running
 	 * hibernation_ops->finish() before saving the image, so we should let
@@ -412,6 +413,7 @@ int hibernation_platform_enter(void)
 	}
 	local_irq_enable();
 
+	entering_sleep_state = false;
 	/*
 	 * We don't need to reenable the nonboot CPUs or resume consoles, since
 	 * the system is going to be halted anyway.
@@ -427,6 +429,11 @@ int hibernation_platform_enter(void)
 	return error;
 }
 
+bool in_hibernation_power_off(void)
+{
+	return entering_sleep_state;
+}
+
 /**
  *	power_down - Shut the machine down for hibernation.
  *
Index: linux-2.6/drivers/char/drm/i915_drv.c
===================================================================
--- linux-2.6.orig/drivers/char/drm/i915_drv.c
+++ linux-2.6/drivers/char/drm/i915_drv.c
@@ -247,6 +247,9 @@ static int i915_suspend(struct drm_devic
 		return -ENODEV;
 	}
 
+	if (in_hibernation_power_off())
+		return 0;
+
 	pci_save_state(dev->pdev);
 	pci_read_config_byte(dev->pdev, LBB, &dev_priv->saveLBB);
 
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