[alsa-devel] [PATCH 1/3] ASoC: Intel: Skylake: fix missing machine device creation

[Vinod Koul]

On Mon, Nov 02, 2015 at 12:07:27PM +0000, Mark Brown wrote:
> On Mon, Nov 02, 2015 at 03:41:08PM +0530, Vinod Koul wrote:
> > On Sun, Nov 01, 2015 at 11:54:38AM +0900, Mark Brown wrote:
> 
> > > > The UEFI BIOS does not create a machine entry for Linux devices
> > > > so add a table style machine registration to fix this missing
> > > > entry
> 
> > > How does this relate to the existing sst_acpi code?  This might be
> > > clearer with a user...
> 
> > It is similar but sst_machines structure is entirely different. In Skylake
> > case we only need machine entry name and rest of the information is coming
> 
> So what exactly is the "machine entry name" supposed to be here and why
> don't we use any board specific information?

For this case the machine entry name is "skl_alc286s_i2s", which is the RT
ALC 286 codec combination on Skylake.
The SKL machine driver needs this as platform device and we create it here

> +static struct sst_machines sst_skl_devdata[] = {
> +	{ "INT343A", "skl_alc286s_i2s" },
> +};

This says for SKL, with codec ID "INT343A" create "skl_alc286s_i2s" machine
platform device
For different codec combination we can use codec ACPI names to match

> I'm not sure I entirely believe that this is going to work well in
> practice TBH.

This is same way used for other Intel platfroms, but agreed this is not
elegant and I am looking at removing this with the help of topology, but not
there yet so need this one for a while :)

> > I am not sure I follow the comment on user, the SKL driver here is user in
> > this
> 
> There are no machines defined for this.

sound/soc/intel/boards/skl_rt286.c

-- 
~Vinod