[PATCH RFC v2 0/3] PCI/ASPM: add sysfs attribute for controlling ASPM

[Heiner Kallweit <hkallweit1@gmail.com>]

Background of this extension is a problem with the r8169 network driver.
Several combinations of board chipsets and network chip versions have
problems if ASPM is enabled, therefore we have to disable ASPM per
default. However especially on notebooks ASPM can provide significant
power-saving, therefore we want to give users the option to enable
ASPM. With the new sysfs attribute users can control which ASPM
link-states are disabled.

This is a RFC version, therefore documentation of attribute is
still missing. The attribute handling was inspired by the protocol
attribute handling in drivers/media/rc/rc-main.c.
Attribute syntax in a few words:
none: allow all supported ASPM states
all: disable all ASPM states
+<state>: add state to list of disabled ASPM states
-<state>: re-enable ASPM state if supported

v2:
- bind attribute to the endpoint

Heiner Kallweit (3):
  PCI/ASPM: add L1 sub-state support to pci_disable_link_state
  PCI/ASPM: allow to re-enable Clock PM
  PCI/ASPM: add sysfs attribute for controlling ASPM

 drivers/pci/pci.h        |   8 +-
 drivers/pci/pcie/aspm.c  | 204 ++++++++++++++++++++++++++++++++++++---
 include/linux/pci-aspm.h |   8 +-
 3 files changed, 199 insertions(+), 21 deletions(-)

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2.21.0