ACK/Cmnt: [SRU] [B/D/Unstable/OEM-B/OEM-OSP1-B] [PATCH 0/1] Unhide Nvidia HDA audio controller

[Stefan Bader]

On 12.07.19 08:34, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1836308
> 
> [Impact]
> Nvidia HDA audio controller comes with Nvidia graphics cannot be found
> by PCI subsystem.
> 
> [Fix]
> Write bit 25 at graphics' config space offset 0x488 to enable the HDA
> controller.
> 
> [Test]
> Nvidia HDA controller is not listed under lspci.
> After applying the fix lspci can find Nvidia HDA controller.
> 
> [Regression Potential]
> Low. This fix doesn't bring any functional change other then exposing
> HDA controller at hardware level.

Not sure I fully concur. The change causes a write to pci config space based on
vendor being NVidia and the device id being higher that some number. This
assumes that the ids were always used sanely and none of the things out there
acting odd if that bit is poked. It probably is rare but I am prepared to expect
the unexpected. :)

-Stefan
> 
> Lukas Wunner (1):
>   PCI: Enable NVIDIA HDA controllers
> 
>  drivers/pci/quirks.c    | 30 ++++++++++++++++++++++++++++++
>  include/linux/pci_ids.h |  1 +
>  2 files changed, 31 insertions(+)
> 
Acked-by: Stefan Bader <stefan.bader at canonical.com>

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