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Subject[RFC] [PATCH] Execute PCI quirks on resume from suspend-to-RAM
Hi,

machines with the asus_hides_smbus "feature" have the problem
that the smbus is disabled again after suspend-to-RAM. This
causes all sorts of problems, the worst being a total fan
failure on my Samsung P35 notebook after STR and STD.

References: Novell bugzilla #173420.

This (totally ugly) patch fixes it.
Comments/criticism welcome.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
--
http://www.hailfinger.org/

--- linux-2.6.16.14/drivers/acpi/sleep/main.c 2006-05-09 19:02:39.000000000 +0200
+++ linux-2.6.16.14/drivers/acpi/sleep/main.c 2006-05-10 01:47:07.000000000 +0200
@@ -10,6 +10,7 @@
*
*/

+#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/dmi.h>
@@ -24,6 +25,7 @@
static struct pm_ops acpi_pm_ops;

extern void do_suspend_lowlevel(void);
+extern struct pci_dev *asus_lpc_pcidev;

static u32 acpi_suspend_states[] = {
[PM_SUSPEND_ON] = ACPI_STATE_S0,
@@ -116,6 +118,9 @@
if (pm_state > PM_SUSPEND_STANDBY)
acpi_restore_state_mem();

+ if (asus_lpc_pcidev)
+ pci_fixup_device(pci_fixup_header, asus_lpc_pcidev);
+
return ACPI_SUCCESS(status) ? 0 : -EFAULT;
}

--- linux-2.6.16.14/drivers/pci/quirks.c 2006-05-05 02:03:45.000000000 +0200
+++ linux-2.6.16.14/drivers/pci/quirks.c 2006-05-10 01:51:06.000000000 +0200
@@ -873,9 +873,10 @@
* becomes necessary to do this tweak in two steps -- I've chosen the Host
* bridge as trigger.
*/
-static int __initdata asus_hides_smbus = 0;
+static int asus_hides_smbus = 0;
+struct pci_dev *asus_lpc_pcidev = NULL;

-static void __init asus_hides_smbus_hostbridge(struct pci_dev *dev)
+static void asus_hides_smbus_hostbridge(struct pci_dev *dev)
{
if (unlikely(dev->subsystem_vendor == PCI_VENDOR_ID_ASUSTEK)) {
if (dev->device == PCI_DEVICE_ID_INTEL_82845_HB)
@@ -968,7 +969,7 @@
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82855GM_HB, asus_hides_smbus_hostbridge );
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82915GM_HB, asus_hides_smbus_hostbridge );

-static void __init asus_hides_smbus_lpc(struct pci_dev *dev)
+static void asus_hides_smbus_lpc(struct pci_dev *dev)
{
u16 val;

@@ -981,8 +982,11 @@
pci_read_config_word(dev, 0xF2, &val);
if (val & 0x8)
printk(KERN_INFO "PCI: i801 SMBus device continues to play 'hide and seek'! 0x%x\n", val);
- else
+ else {
printk(KERN_INFO "PCI: Enabled i801 SMBus device\n");
+ if (!asus_lpc_pcidev)
+ asus_lpc_pcidev = dev;
+ }
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0, asus_hides_smbus_lpc );
@@ -991,7 +995,7 @@
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12, asus_hides_smbus_lpc );
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0, asus_hides_smbus_lpc );

-static void __init asus_hides_smbus_lpc_ich6(struct pci_dev *dev)
+static void asus_hides_smbus_lpc_ich6(struct pci_dev *dev)
{
u32 val, rcba;
void __iomem *base;
@@ -1374,4 +1378,5 @@
EXPORT_SYMBOL(pcie_mch_quirk);
#ifdef CONFIG_HOTPLUG
EXPORT_SYMBOL(pci_fixup_device);
+EXPORT_SYMBOL(asus_lpc_pcidev);
#endif

-
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