Running pcie_capability_clear_word with
PCI_EXP_LNKCTL_ASPM_L0S|PCI_EXP_LNKCTL_ASPM_L1 indeed makes the link
ASPM state switch to disabled, however as I see there is more than one
call of pci_disable_link_state. If it does not work with ath5k then link
control is supposedly broken for r8169, intel e1000 and some other
drivers.
However, this bit from e1000 is interesting:
#ifdef CONFIG_PCIEASPM
static void __e1000e_disable_aspm(struct pci_dev *pdev, u16 state)
{
pci_disable_link_state_locked(pdev, state);
}
#else
static void __e1000e_disable_aspm(struct pci_dev *pdev, u16 state)
{
...
do magic with pcie_capability_clear_word
...
}
#endif
CONFIG_PCIEASPM=y in 3.8.0-12-generic
I will test r8169 PCI-X device shortly to see whether it is also
affected.
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https://bugs.launchpad.net/bugs/1137513
Title:
Wireless 168c:001c with ath5k on Acer Aspire One AOA150 download
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