On Friday, 22 of February 2008, Jesse Barnes wrote:
quoted text
> On Thursday, February 21, 2008 5:13 pm Jesse Barnes wrote:
> > On Thursday, February 21, 2008 4:54 pm Rafael J. Wysocki wrote:
> > > On Friday, 22 of February 2008, Linus Torvalds wrote:
> > > > On Fri, 22 Feb 2008, Rafael J. Wysocki wrote:
> > > > > -	if (state.event == PM_EVENT_SUSPEND) {
> > > > > +	if (state.event == PM_EVENT_SUSPEND && !in_hibernation_power_off())
> > > > > {
> > > >
> > > > I don't understand why hibernation just doesn't use a
> > > > PM_EVENT_HIBERNATE, and be done with it?
> > > >
> > > > Why should it be called PM_EVENT_SUSPEND when it isn't?
> > > >
> > > > Adding some external global variables is absolutely the wrong way to
> > > > fix this.
> > > >
> > > > It's not even like there are very many drivers who actually care about
> > > > "state.event" anyway: a 'git grep' returns just 35 users in the whole
> > > > tree, so if this was done this ugly way just to avoid double-chcking
> > > > the other cases that compare against PM_EVENT_SUSPEND, then it really
> > > > wasn't worth it.
> > >
> > > Please relax, we're debugging the thing right now and the patch doesn't
> > > even seem to help on the other affected box.
> >
> > Actually, looks like I forgot to reboot between tests (just rmmod'd &
> > modprobed i915), your patch actually does work.
> >
> > However, making new PM event messages might be a good thing anyway,
> > assuming Linus takes it for 2.6.25, since it should make the migration to
> > ->hibernate callbacks easier.
> 
> Rafael, I'd actually prefer these changes to the i915 driver.  One is to avoid 
> the "green screen" problem and the other is to actually save state at 
> hibernate time in case we don't do a POST coming out of S4 (probably not 
> common but hey).

Below is a patch that introduces PM_EVENT_HIBERNATE as requested by Linus
and (hopefully) makes hibernation with i915 work correctly.

I must admit I don't feel very comfortable introduces PM_EVENT_HIBERNATE at
this point, since such changes tend to introduce unexpected issues all over the
place, but hopefully this time it won't break anything.

I have tested it on the nx6325.

Please review and tell me if it looks good.

Jesse and Jeff, please check if your boxes hibernate correctly with this patch
applied.

Thanks,
Rafael

---
 Documentation/power/devices.txt        |   13 ++++++++-----
 drivers/ata/ahci.c                     |    3 ++-
 drivers/ata/ata_piix.c                 |    3 ++-
 drivers/ata/libata-core.c              |    2 +-
 drivers/char/drm/i915_drv.c            |    4 +++-
 drivers/ide/ppc/pmac.c                 |    6 ++++--
 drivers/macintosh/mediabay.c           |    4 +++-
 drivers/pci/pci.c                      |    1 +
 drivers/scsi/aic7xxx/aic79xx_osm_pci.c |    2 +-
 drivers/scsi/aic7xxx/aic7xxx_osm_pci.c |    2 +-
 drivers/scsi/mesh.c                    |    1 +
 drivers/scsi/sd.c                      |    5 +++--
 drivers/usb/host/sl811-hcd.c           |    1 +
 drivers/usb/host/u132-hcd.c            |   10 +++++++---
 drivers/video/chipsfb.c                |    3 ++-
 drivers/video/nvidia/nvidia.c          |    3 ++-
 include/linux/pm.h                     |    5 +++++
 kernel/power/disk.c                    |    4 ++--
 net/rfkill/rfkill.c                    |    3 ++-
 19 files changed, 51 insertions(+), 24 deletions(-)

Index: linux-2.6/kernel/power/disk.c
===================================================================
--- linux-2.6.orig/kernel/power/disk.c
+++ linux-2.6/kernel/power/disk.c
@@ -391,7 +391,7 @@ int hibernation_platform_enter(void)
 		goto Close;
 
 	suspend_console();
-	error = device_suspend(PMSG_SUSPEND);
+	error = device_suspend(PMSG_HIBERNATE);
 	if (error)
 		goto Resume_console;
 
@@ -404,7 +404,7 @@ int hibernation_platform_enter(void)
 		goto Finish;
 
 	local_irq_disable();
-	error = device_power_down(PMSG_SUSPEND);
+	error = device_power_down(PMSG_HIBERNATE);
 	if (!error) {
 		hibernation_ops->enter();
 		/* We should never get here */
Index: linux-2.6/include/linux/pm.h
===================================================================
--- linux-2.6.orig/include/linux/pm.h
+++ linux-2.6/include/linux/pm.h
@@ -143,6 +143,9 @@ typedef struct pm_message {
  * 		the upcoming system state (such as PCI_D3hot), and enable
  * 		wakeup events as appropriate.
  *
+ * HIBERNATE	Enter a low power device state appropriate for the hibernation
+ * 		state (eg. ACPI S4) and enable wakeup events as appropriate.
+ *
  * FREEZE	Quiesce operations so that a consistent image can be saved;
  * 		but do NOT otherwise enter a low power device state, and do
  * 		NOT emit system wakeup events.
@@ -167,10 +170,12 @@ typedef struct pm_message {
 #define PM_EVENT_FREEZE 1
 #define PM_EVENT_SUSPEND 2
 #define PM_EVENT_PRETHAW 3
+#define PM_EVENT_HIBERNATE 4
 
 #define PMSG_FREEZE	((struct pm_message){ .event = PM_EVENT_FREEZE, })
 #define PMSG_PRETHAW	((struct pm_message){ .event = PM_EVENT_PRETHAW, })
 #define PMSG_SUSPEND	((struct pm_message){ .event = PM_EVENT_SUSPEND, })
+#define PMSG_HIBERNATE	((struct pm_message){ .event = PM_EVENT_HIBERNATE, })
 #define PMSG_ON		((struct pm_message){ .event = PM_EVENT_ON, })
 
 struct dev_pm_info {
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
@@ -222,6 +222,7 @@ static void i915_restore_vga(struct drm_
 			   dev_priv->saveGR[0x18]);
 
 	/* Attribute controller registers */
+	inb(st01);
 	for (i = 0; i < 20; i++)
 		i915_write_ar(st01, i, dev_priv->saveAR[i], 0);
 	inb(st01); /* switch back to index mode */
@@ -369,7 +370,8 @@ static int i915_suspend(struct drm_devic
 	if (state.event == PM_EVENT_SUSPEND) {
 		/* Shut down the device */
 		pci_disable_device(dev->pdev);
-		pci_set_power_state(dev->pdev, PCI_D3hot);
+		pci_set_power_state(dev->pdev,
+					pci_choose_state(dev->pdev, state));
 	}
 
 	return 0;
Index: linux-2.6/drivers/ata/ahci.c
===================================================================
--- linux-2.6.orig/drivers/ata/ahci.c
+++ linux-2.6/drivers/ata/ahci.c
@@ -1932,7 +1932,8 @@ static int ahci_pci_device_suspend(struc
 	void __iomem *mmio = host->iomap[AHCI_PCI_BAR];
 	u32 ctl;
 
-	if (mesg.event == PM_EVENT_SUSPEND) {
+	if (mesg.event == PM_EVENT_SUSPEND
+	    || mesg.event == PM_EVENT_HIBERNATE) {
 		/* AHCI spec rev1.1 section 8.3.3:
 		 * Software must disable interrupts prior to requesting a
 		 * transition of the HBA to D3 state.
Index: linux-2.6/drivers/ata/ata_piix.c
===================================================================
--- linux-2.6.orig/drivers/ata/ata_piix.c
+++ linux-2.6/drivers/ata/ata_piix.c
@@ -1339,7 +1339,8 @@ static int piix_pci_device_suspend(struc
 	 * cycles and power trying to do something to the sleeping
 	 * beauty.
 	 */
-	if (piix_broken_suspend() && mesg.event == PM_EVENT_SUSPEND) {
+	if (piix_broken_suspend() && (mesg.event == PM_EVENT_SUSPEND
+	    || mesg.event == PM_EVENT_HIBERNATE)) {
 		pci_save_state(pdev);
 
 		/* mark its power state as "unknown", since we don't
Index: linux-2.6/drivers/ata/libata-core.c
===================================================================
--- linux-2.6.orig/drivers/ata/libata-core.c
+++ linux-2.6/drivers/ata/libata-core.c
@@ -7368,7 +7368,7 @@ void ata_pci_device_do_suspend(struct pc
 	pci_save_state(pdev);
 	pci_disable_device(pdev);
 
-	if (mesg.event == PM_EVENT_SUSPEND)
+	if (mesg.event == PM_EVENT_SUSPEND || mesg.event == PM_EVENT_HIBERNATE)
 		pci_set_power_state(pdev, PCI_D3hot);
 }
 
Index: linux-2.6/drivers/ide/ppc/pmac.c
===================================================================
--- linux-2.6.orig/drivers/ide/ppc/pmac.c
+++ linux-2.6/drivers/ide/ppc/pmac.c
@@ -1254,7 +1254,8 @@ pmac_ide_macio_suspend(struct macio_dev 
 	int		rc = 0;
 
 	if (mesg.event != mdev->ofdev.dev.power.power_state.event
-			&& mesg.event == PM_EVENT_SUSPEND) {
+			&& (mesg.event == PM_EVENT_SUSPEND
+			|| mesg.event == PM_EVENT_HIBERNATE)) {
 		rc = pmac_ide_do_suspend(hwif);
 		if (rc == 0)
 			mdev->ofdev.dev.power.power_state = mesg;
@@ -1364,7 +1365,8 @@ pmac_ide_pci_suspend(struct pci_dev *pde
 	int		rc = 0;
 	
 	if (mesg.event != pdev->dev.power.power_state.event
-			&& mesg.event == PM_EVENT_SUSPEND) {
+			&& (mesg.event == PM_EVENT_SUSPEND
+			|| mesg.event == PM_EVENT_HIBERNATE)) {
 		rc = pmac_ide_do_suspend(hwif);
 		if (rc == 0)
 			pdev->dev.power.power_state = mesg;
Index: linux-2.6/drivers/macintosh/mediabay.c
===================================================================
--- linux-2.6.orig/drivers/macintosh/mediabay.c
+++ linux-2.6/drivers/macintosh/mediabay.c
@@ -698,7 +698,9 @@ static int media_bay_suspend(struct maci
 {
 	struct media_bay_info	*bay = macio_get_drvdata(mdev);
 
-	if (state.event != mdev->ofdev.dev.power.power_state.event && state.event == PM_EVENT_SUSPEND) {
+	if (state.event != mdev->ofdev.dev.power.power_state.event
+	    && (state.event == PM_EVENT_SUSPEND
+	    || state.event == PM_EVENT_HIBERNATE)) {
 		down(&bay->lock);
 		bay->sleeping = 1;
 		set_mb_power(bay, 0);
Index: linux-2.6/drivers/pci/pci.c
===================================================================
--- linux-2.6.orig/drivers/pci/pci.c
+++ linux-2.6/drivers/pci/pci.c
@@ -554,6 +554,7 @@ pci_power_t pci_choose_state(struct pci_
 	case PM_EVENT_PRETHAW:
 		/* REVISIT both freeze and pre-thaw "should" use D0 */
 	case PM_EVENT_SUSPEND:
+	case PM_EVENT_HIBERNATE:
 		return PCI_D3hot;
 	default:
 		printk("Unrecognized suspend event %d\n", state.event);
Index: linux-2.6/drivers/scsi/aic7xxx/aic79xx_osm_pci.c
===================================================================
--- linux-2.6.orig/drivers/scsi/aic7xxx/aic79xx_osm_pci.c
+++ linux-2.6/drivers/scsi/aic7xxx/aic79xx_osm_pci.c
@@ -89,7 +89,7 @@ ahd_linux_pci_dev_suspend(struct pci_dev
 	pci_save_state(pdev);
 	pci_disable_device(pdev);
 
-	if (mesg.event == PM_EVENT_SUSPEND)
+	if (mesg.event == PM_EVENT_SUSPEND || mesg.event == PM_EVENT_HIBERNATE)
 		pci_set_power_state(pdev, PCI_D3hot);
 
 	return rc;
Index: linux-2.6/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c
===================================================================
--- linux-2.6.orig/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c
+++ linux-2.6/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c
@@ -134,7 +134,7 @@ ahc_linux_pci_dev_suspend(struct pci_dev
 	pci_save_state(pdev);
 	pci_disable_device(pdev);
 
-	if (mesg.event == PM_EVENT_SUSPEND)
+	if (mesg.event == PM_EVENT_SUSPEND || mesg.event == PM_EVENT_HIBERNATE)
 		pci_set_power_state(pdev, PCI_D3hot);
 
 	return rc;
Index: linux-2.6/drivers/scsi/mesh.c
===================================================================
--- linux-2.6.orig/drivers/scsi/mesh.c
+++ linux-2.6/drivers/scsi/mesh.c
@@ -1759,6 +1759,7 @@ static int mesh_suspend(struct macio_dev
 
 	switch (mesg.event) {
 	case PM_EVENT_SUSPEND:
+	case PM_EVENT_HIBERNATE:
 	case PM_EVENT_FREEZE:
 		break;
 	default:
Index: linux-2.6/drivers/scsi/sd.c
===================================================================
--- linux-2.6.orig/drivers/scsi/sd.c
+++ linux-2.6/drivers/scsi/sd.c
@@ -1835,8 +1835,9 @@ static int sd_suspend(struct device *dev
 			goto done;
 	}
 
-	if (mesg.event == PM_EVENT_SUSPEND &&
-	    sdkp->device->manage_start_stop) {
+	if ((mesg.event == PM_EVENT_SUSPEND
+	     || mesg.event == PM_EVENT_HIBERNATE)
+	    && sdkp->device->manage_start_stop) {
 		sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
 		ret = sd_start_stop_device(sdkp, 0);
 	}
Index: linux-2.6/drivers/usb/host/sl811-hcd.c
===================================================================
--- linux-2.6.orig/drivers/usb/host/sl811-hcd.c
+++ linux-2.6/drivers/usb/host/sl811-hcd.c
@@ -1766,6 +1766,7 @@ sl811h_suspend(struct platform_device *d
 		retval = sl811h_bus_suspend(hcd);
 		break;
 	case PM_EVENT_SUSPEND:
+	case PM_EVENT_HIBERNATE:
 	case PM_EVENT_PRETHAW:		/* explicitly discard hw state */
 		port_power(sl811, 0);
 		break;
Index: linux-2.6/drivers/usb/host/u132-hcd.c
===================================================================
--- linux-2.6.orig/drivers/usb/host/u132-hcd.c
+++ linux-2.6/drivers/usb/host/u132-hcd.c
@@ -3214,14 +3214,18 @@ static int u132_suspend(struct platform_
                 return -ESHUTDOWN;
         } else {
                 int retval = 0;
-                if (state.event == PM_EVENT_FREEZE) {
+
+		switch (state.event) {
+		case PM_EVENT_FREEZE:
                         retval = u132_bus_suspend(hcd);
-                } else if (state.event == PM_EVENT_SUSPEND) {
+			break;
+		case PM_EVENT_SUSPEND:
+		case PM_EVENT_HIBERNATE:
                         int ports = MAX_U132_PORTS;
                         while (ports-- > 0) {
                                 port_power(u132, ports, 0);
                         }
-                }
+			break;
                 if (retval == 0)
                         pdev->dev.power.power_state = state;
                 return retval;
Index: linux-2.6/drivers/video/chipsfb.c
===================================================================
--- linux-2.6.orig/drivers/video/chipsfb.c
+++ linux-2.6/drivers/video/chipsfb.c
@@ -459,7 +459,8 @@ static int chipsfb_pci_suspend(struct pc
 
 	if (state.event == pdev->dev.power.power_state.event)
 		return 0;
-	if (state.event != PM_EVENT_SUSPEND)
+	if (state.event != PM_EVENT_SUSPEND
+	    && state.event != PM_EVENT_HIBERNATE)
 		goto done;
 
 	acquire_console_sem();
Index: linux-2.6/drivers/video/nvidia/nvidia.c
===================================================================
--- linux-2.6.orig/drivers/video/nvidia/nvidia.c
+++ linux-2.6/drivers/video/nvidia/nvidia.c
@@ -1066,7 +1066,8 @@ static int nvidiafb_suspend(struct pci_d
 	acquire_console_sem();
 	par->pm_state = mesg.event;
 
-	if (mesg.event == PM_EVENT_SUSPEND) {
+	if (mesg.event == PM_EVENT_SUSPEND
+	    || mesg.event == PM_EVENT_HIBERNATE) {
 		fb_set_suspend(info, 1);
 		nvidiafb_blank(FB_BLANK_POWERDOWN, info);
 		nvidia_write_regs(par, &par->SavedReg);
Index: linux-2.6/net/rfkill/rfkill.c
===================================================================
--- linux-2.6.orig/net/rfkill/rfkill.c
+++ linux-2.6/net/rfkill/rfkill.c
@@ -232,7 +232,8 @@ static int rfkill_suspend(struct device 
 	struct rfkill *rfkill = to_rfkill(dev);
 
 	if (dev->power.power_state.event != state.event) {
-		if (state.event == PM_EVENT_SUSPEND) {
+		if (state.event == PM_EVENT_SUSPEND
+		    || state.event == PM_EVENT_HIBERNATE) {
 			mutex_lock(&rfkill->mutex);
 
 			if (rfkill->state == RFKILL_STATE_ON)
Index: linux-2.6/Documentation/power/devices.txt
===================================================================
--- linux-2.6.orig/Documentation/power/devices.txt
+++ linux-2.6/Documentation/power/devices.txt
@@ -310,9 +310,12 @@ used with suspend-to-disk:
     PM_EVENT_SUSPEND -- quiesce the driver and put hardware into a low-power
 	state.  When used with system sleep states like "suspend-to-RAM" or
 	"standby", the upcoming resume() call will often be able to rely on
-	state kept in hardware, or issue system wakeup events.  When used
-	instead with suspend-to-disk, few devices support this capability;
-	most are completely powered off.
+	state kept in hardware, or issue system wakeup events.
+
+    PM_EVENT_HIBERNATE -- Put hardware into a low-power state and enable wakeup
+	events as appropriate.  It is only used with hibernation
+	(suspend-to-disk) and few devices are able to wake up the system from
+	this state; most are completely powered off.
 
     PM_EVENT_FREEZE -- quiesce the driver, but don't necessarily change into
 	any low power mode.  A system snapshot is about to be taken, often
@@ -329,8 +332,8 @@ used with suspend-to-disk:
 	wakeup events nor DMA are allowed.
 
 To enter "standby" (ACPI S1) or "Suspend to RAM" (STR, ACPI S3) states, or
-the similarly named APM states, only PM_EVENT_SUSPEND is used; for "Suspend
-to Disk" (STD, hibernate, ACPI S4), all of those event codes are used.
+the similarly named APM states, only PM_EVENT_SUSPEND is used; the other event
+codes are used for hibernation ("Suspend to Disk", STD, ACPI S4).
 
 There's also PM_EVENT_ON, a value which never appears as a suspend event
 but is sometimes used to record the "not suspended" device state.
--
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