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

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Message-Id: <200802201209.03807.jesse.barnes@intel.com>
Date:	Wed, 20 Feb 2008 12:09:03 -0800
From:	Jesse Barnes <jesse.barnes@...el.com>
To:	"Jeff Chua" <jeff.chua.linux@...il.com>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"Dave Airlie" <airlied@...ux.ie>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-acpi@...r.kernel.org,
	"suspend-devel List" <suspend-devel@...ts.sourceforge.net>,
	"Greg KH" <gregkh@...e.de>
Subject: Re: 2.6.25-rc2 System no longer powers off after suspend-to-disk. Screen becomes green.

On Wednesday, February 20, 2008 11:18 am Jesse Barnes wrote:
> On Wednesday, February 20, 2008 11:10 am Jeff Chua wrote:
> > On Feb 21, 2008 2:53 AM, Jesse Barnes <jesse.barnes@...el.com> wrote:
> > > > So, next I'll try "shutdown" to see if it work. I was using
> > > > "platform".
> > >
> > > Ok, that would be good to try.
> >
> > "shutdown" does power down properly. But still green on resume.
>
> Ok, so Linus' theory about something later in the resume path trying to
> touch video is looking good.
>
> Rafael, is there anyway to prevent the device shutdown in the hibernate
> path?

Given the way the PM core works, do we need to set a flag like this?  I really 
hope there's a better way of doing this...

Thanks,
Jesse

diff --git a/drivers/char/drm/i915_drv.c b/drivers/char/drm/i915_drv.c
index 4048f39..a2d6242 100644
--- a/drivers/char/drm/i915_drv.c
+++ b/drivers/char/drm/i915_drv.c
@@ -238,6 +238,13 @@ static void i915_restore_vga(struct drm_device *dev)
 
 }
 
+/*
+ * If we're doing a suspend to disk, we don't want to power off the device.
+ * Unfortunately, the PM core doesn't tell us if we're headed for a regular
+ * S3 state or that it's about to shut down the machine, so we use this flag.
+ */
+static int i915_hibernate;
+
 static int i915_suspend(struct drm_device *dev, pm_message_t state)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -252,6 +259,9 @@ static int i915_suspend(struct drm_device *dev, 
pm_message_t state)
 	if (state.event == PM_EVENT_PRETHAW)
 		return 0;
 
+	if (state.event == PM_EVENT_FREEZE)
+		i915_hibernate = 1;
+
 	pci_save_state(dev->pdev);
 	pci_read_config_byte(dev->pdev, LBB, &dev_priv->saveLBB);
 
@@ -366,7 +376,7 @@ static int i915_suspend(struct drm_device *dev, 
pm_message_t state)
 
 	i915_save_vga(dev);
 
-	if (state.event == PM_EVENT_SUSPEND) {
+	if (!i915_hibernate) {
 		/* Shut down the device */
 		pci_disable_device(dev->pdev);
 		pci_set_power_state(dev->pdev, PCI_D3hot);
@@ -385,6 +395,8 @@ static int i915_resume(struct drm_device *dev)
 	if (pci_enable_device(dev->pdev))
 		return -1;
 
+	i915_hibernate = 0;
+
 	pci_write_config_byte(dev->pdev, LBB, dev_priv->saveLBB);
 
 	/* Pipe & plane A info */
--
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