Also, it seems reasonable to add some diagnostic printk()s to pci_pm_init().
Thanks,
Rafael
---
From: Rafael J. Wysocki <rjw@xxxxxxx>
PCI PM: Add diagnostic statements to PCI device PM initialization
Add two diagnostic printk()s to pci_pm_init() allowing us to check
in the kernel log which PCI devices support generation of PME# and
from what states as well as which PCI devices can generate wake-up
events with the help of the platform.
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
---
drivers/pci/pci.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
Index: linux-next/drivers/pci/pci.c
===================================================================
--- linux-next.orig/drivers/pci/pci.c
+++ linux-next/drivers/pci/pci.c
@@ -1128,14 +1128,24 @@ void pci_pm_init(struct pci_dev *dev)
/* Check device's ability to generate PME# */
pci_read_config_word(dev, pm + PCI_PM_PMC, &pmc);
if (pmc & PCI_PM_CAP_PME_MASK) {
+ printk(KERN_INFO "PCI: Device %s can generate PME# from"
+ "%s%s%s%s%s\n", pci_name(dev),
+ (pmc & PCI_PM_CAP_PME_D0) ? " D0" : "",
+ (pmc & PCI_PM_CAP_PME_D1) ? " D1" : "",
+ (pmc & PCI_PM_CAP_PME_D2) ? " D2" : "",
+ (pmc & PCI_PM_CAP_PME_D3) ? " D3hot" : "",
+ (pmc & PCI_PM_CAP_PME_D3cold) ? " D3cold" : "");
can_wakeup = true;
/* Disable the PME# generation capability */
pci_pme_active(dev, pm, false);
}
}
- if (platform_pci_can_wakeup(dev))
+ if (platform_pci_can_wakeup(dev)) {
+ printk(KERN_INFO "PCI: Device %s can generate system wake-up "
+ "events through the platform\n", pci_name(dev));
can_wakeup = true;
+ }
device_init_wakeup(&dev->dev, can_wakeup);
}
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