[Nouveau] [PATCH v2 0/4] nouveau RPM fixes for Optimus

[Peter Wu]

Hi,

Here are two patches to fix an issue reported on kernel bugzilla (infinite loop
due to unchecked function) and a more important fix to fix hanging Optimus
machines when runtime PM is enabled (with pm/pci patches).

See the first version[1] for a background on the fixed problems. This is the
second revision of incorporating feedback from Emil Velikov (patch 1), Mika
Westerberg (patch 4). Patches 2 and 3 are unchanged.
The previous patchset had R-b from Hans de Goede, I think they are still valid.

Noteworthy is that the fourth patch now checks directly for _PR3. The commit
message is updated to emphasize that memory/disk corruption is fixed for some
machines.


This patchset can be merged before or after the pci/pm changes[2] (expected to
be merged for 4.8), see the original posting[1] for consequences. I have tested
it on top of v4.7-rc5. To make patch four work properly, Lukas' RPM refcounting
patches should be included. A similar (open/new) RPM refcounting issue in
snd-hda-intel should also be fixed. Otherwise the bridge will not really sleep.

There is another minor patch for nouveau_pr3_present, but it is not included
here because it depends on visibility of pci_bridge_d3_possible(). I'll send a
separate mail for this to linux-pci.

Kind regards,
Peter

 [1]: https://lists.freedesktop.org/archives/nouveau/2016-May/025116.html
 [2]: https://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/?h=pci/pm

Peter Wu (4):
  drm/nouveau/acpi: ensure matching ACPI handle and supported functions
  drm/nouveau/acpi: return supported DSM functions
  drm/nouveau/acpi: check for function 0x1B before using it
  drm/nouveau/acpi: fix lockup with PCIe runtime PM

 drivers/gpu/drm/nouveau/nouveau_acpi.c | 103 +++++++++++++++++++++------------
 1 file changed, 66 insertions(+), 37 deletions(-)

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2.9.0