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

[Takashi Iwai]

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,

Takashi