[V3] vga_switcheroo: set audio client id according to bound GPU id

[jimqu]

On 2018年07月17日 16:52, Takashi Iwai wrote:
> On Tue, 17 Jul 2018 10:38:58 +0200,
> Lukas Wunner wrote:
>> On Tue, Jul 17, 2018 at 04:20:50PM +0800, Jim Qu wrote:
>>> On modern laptop, there are more and more platforms
>>> have two GPUs, and each of them maybe have audio codec
>>> for HDMP/DP output. For some dGPU which is no output,
>>> audio codec usually is disabled.
>>>
>>> In currect HDA audio driver, it will set all codec as
>>> VGA_SWITCHEROO_DIS, the audio which is binded to UMA
>>> will be suspended if user use debugfs to contorl power
>>>
>>> In HDA driver side, it is difficult to know which GPU
>>> the audio has binded to. So set the bound gpu pci dev
>>> to vga_switcheroo.
>>>
>>> if the audio client is not the third registration, audio
>>> id will set in vga_switcheroo enable function. if the
>>> audio client is the last registration when vga_switcheroo
>>> _ready() get true, we should get audio client id from bound
>>> GPU directly.
>>>
>>> Signed-off-by: Jim Qu <Jim.Qu at amd.com>
>> Reviewed-by: Lukas Wunner <lukas at wunner.de>
>>
>> @Takashi, any preference which tree to merge this through?
>> sound or drm-misc, either way would seem fine to me.  I think
>> there's going to be one final drm-misc pull sent to Dave this
>> week, after that it's 4.20.
> Since it's basically an audio problem and I'd love to merge it for
> 4.19, I'd prefer taking through sound git tree, unless anyone has
> objection.

Thanks to Takashi and Lukas great help. Please kindly help merge the 
patch into suitable branch.

Thanks
JimQu

> thanks,
>
> Takashi