[Nouveau] [PATCH v3 0/4] nouveau RPM fixes for Optimus (final)

[Peter Wu]

Ping, would it be possible to get some acks and merge it for 4.8?
Current -next is broken (on modern laptops as expected) and these series
fix the issues according to an IRC report.

The audio issue mentioned below should not give issues, modern laptops
do not seem to expose the audio device by default
(https://bugs.freedesktop.org/show_bug.cgi?id=75985). On Windows the
audio device only appears after inserting the HDMI/miniDP cable (my
laptop has no other connectors), enabling the card for rendering
purposes has no effect on the availability of the audio device.

Kind regards,
Peter

On Fri, Jul 15, 2016 at 03:12:14PM +0200, Peter Wu wrote:
> 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).
> 
> These are the final patches targeting v4.8. Changes compared to v2[1]:
> collected R-b from Hans and Mika and fixed a minor comment style issue.
> 
> I recommend it to be merged before the pci/pm patches[2], otherwise there is a
> window where newer Nvidia Optimus laptops might fail to runtime resume and/or
> lock up.  Once the pci/pm branch is merged I will propose another patch to
> improve reliability[3].
> 
> Known issue with patch 4: when a Nvidia HDMI audio function is present, the
> bridge will not suspend and hence the Nvidia card will still be powered. Fixing
> this properly will require more work[4], until then you can kill the audio
> device and make runtime PM work properly:
> 
>     echo 1 > /sys/bus/pci/devices/0000:01:00.1/remove
> 
> Kind regards,
> Peter
> 
>  [1]: https://lists.freedesktop.org/archives/nouveau/2016-July/025519.html
>  [2]: https://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git/?h=pci/pm
>  [3]: http://www.spinics.net/lists/linux-pci/msg52601.html
>  [4]: https://lists.freedesktop.org/archives/dri-devel/2016-July/112759.html
> 
> 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 | 105 +++++++++++++++++++++------------
>  1 file changed, 68 insertions(+), 37 deletions(-)
> 
> -- 
> 2.9.0