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author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-07-15 20:49:21 (GMT) |
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committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-07-15 20:49:21 (GMT) |
commit | d5b2e30bdc695a1735b3c970e1f9738e9ca3dbf0 (patch) | |
tree | 79e832eb50d3b416bdada4903b2a2e2fefcc2800 /drivers/pci/pci-driver.c | |
parent | 7c7fac30581b2fe2e0783d9b6f53ca333cc2296c (diff) | |
parent | 84a1caf1453c3d44050bd22db958af4a7f99315c (diff) | |
download | linux-fsl-qoriq-d5b2e30bdc695a1735b3c970e1f9738e9ca3dbf0.tar.xz |
Merge tag 'v3.5-rc7' into regulator-drivers
Linux 3.5-rc7
Diffstat (limited to 'drivers/pci/pci-driver.c')
-rw-r--r-- | drivers/pci/pci-driver.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index bf0cee6..099f46c 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -748,6 +748,18 @@ static int pci_pm_suspend_noirq(struct device *dev) pci_pm_set_unknown_state(pci_dev); + /* + * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's + * PCI COMMAND register isn't 0, the BIOS assumes that the controller + * hasn't been quiesced and tries to turn it off. If the controller + * is already in D3, this can hang or cause memory corruption. + * + * Since the value of the COMMAND register doesn't matter once the + * device has been suspended, we can safely set it to 0 here. + */ + if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) + pci_write_config_word(pci_dev, PCI_COMMAND, 0); + return 0; } |