[alsa-devel] [RFC PATCH] ASoC: Intel: use common helpers to detect CPUs

[Andy Shevchenko]

On Mon, Jun 17, 2019 at 05:31:53PM +0200, Pierre-Louis Bossart wrote:
> On 6/17/19 4:47 PM, Mark Brown wrote:
> > On Tue, May 28, 2019 at 03:02:55PM -0500, Pierre-Louis Bossart wrote:
> > 
> > > 2. is there a better way to do this for all Intel chips or do we keep
> > > this in sound/? Andy?

It's better to discuss with x86 maintainers.

> > ARM has platform detection stuff in the architecture code, something
> > similar seems sensible for x86?
> 
> Well yes, we already have x86_match_cpu() but that won't work with
> COMPILE_TEST (asm/ headers don't exist) and this leads to duplication of
> code. All we really need here is a yeah/nay answer from a help that hides
> those details away.

I don't see much advantage here. Without specific driver data it will be
degraded to something like:

	if (bootcpu.model == INTEL_CPU_...)
		...

with slight exception to heterogeneous SoCs.

In order to be compile tested we might introduce a header under
include/platform_data/x86 with these inliners like:

static inline bool is_x86_model_XX(void)
{
	return bootcpu.model == XX; // it might be done in more generic way?
}

-- 
With Best Regards,
Andy Shevchenko