diff options
| author | Bjorn Helgaas <bhelgaas@google.com> | 2013-05-21 10:56:51 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2013-05-21 10:56:51 -0600 |
| commit | 2add0ec14c259471d45d6afd051ca02eef0a4a92 (patch) | |
| tree | f863949b30c8a3e0b3096b1284096a6e675069b7 /Makefile | |
| parent | de7f2b1bdf02f6b44410dceb7295284c2a75a304 (diff) | |
PCI/ASPM: Warn when driver asks to disable ASPM, but we can't do it
Some devices have hardware problems related to using ASPM. Drivers for
these devices use pci_disable_link_state() to prevent their device from
entering L0s or L1. But on platforms where the OS doesn't have permission
to manage ASPM, pci_disable_link_state() doesn't actually disable ASPM.
Windows has a similar mechanism ("PciASPMOptOut"), and when the OS doesn't
have control of ASPM, it doesn't actually disable ASPM either.
This patch just adds a warning in dmesg about the fact that
pci_disable_link_state() is doing nothing.
Reported-by: Emmanuel Grumbach <egrumbach@gmail.com>
Reference: https://lkml.kernel.org/r/CANUX_P3F5YhbZX3WGU-j1AGpbXb_T9Bis2ErhvKkFMtDvzatVQ@mail.gmail.com
Reference: https://bugzilla.kernel.org/show_bug.cgi?id=57331
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'Makefile')
0 files changed, 0 insertions, 0 deletions