linux-kernel - Re: 2.6.38 regression caused by commit 415e12b

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Date:	Wed, 2 Mar 2011 01:17:04 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Cc:	linux-usb@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ozan Caglayan <ozan@...dus.org.tr>
Subject: Re: 2.6.38 regression caused by commit 415e12b

On Wednesday, March 02, 2011, Sarah Sharp wrote:
> On Wed, Mar 02, 2011 at 12:30:16AM +0100, Rafael J. Wysocki wrote:
> > On Tuesday, March 01, 2011, Sarah Sharp wrote:
> > > On Tue, Mar 01, 2011 at 09:55:33PM +0100, Rafael J. Wysocki wrote:
> > > > Please check if the appended patch (on top of the Linus' current) helps.
> > > 
> > > Sorry, it doesn't help.  Same message as before.
> > 
> > Can you send dmesg with the patch applied, please?
> 
> Attached.

Something's fishy.  Evidently, _OSC is not executed on your system
although it should be with the patch.

Please try the patch below instead and send dmesg (either way).

Thanks,
Rafael

---
 drivers/acpi/pci_root.c |   11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

Index: linux-2.6/drivers/acpi/pci_root.c
===================================================================
--- linux-2.6.orig/drivers/acpi/pci_root.c
+++ linux-2.6/drivers/acpi/pci_root.c
@@ -48,10 +48,7 @@ static int acpi_pci_root_add(struct acpi
 static int acpi_pci_root_remove(struct acpi_device *device, int type);
 static int acpi_pci_root_start(struct acpi_device *device);
 
-#define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT \
-				| OSC_ACTIVE_STATE_PWR_SUPPORT \
-				| OSC_CLOCK_PWR_CAPABILITY_SUPPORT \
-				| OSC_MSI_SUPPORT)
+#define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT | OSC_MSI_SUPPORT)
 
 static const struct acpi_device_id root_device_ids[] = {
 	{"PNP0A03", 0},
@@ -572,8 +569,10 @@ static int __devinit acpi_pci_root_add(s
 	if (flags != base_flags)
 		acpi_pci_osc_support(root, flags);
 
-	if (!pcie_ports_disabled
-	    && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) {
+	if (!pcie_ports_disabled) {
+		dev_info(root->bus->bridge,
+			"ACPI _OSC support set (0x%02x)\n", flags);
+
 		flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL
 			| OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
 			| OSC_PCI_EXPRESS_PME_CONTROL;
--
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