Re: [RFC PATCH v4 8/8] acpi_idle: Disallow play_dead with FFH cstate on AMD platforms

[Patryk Wlazlyn]

> So I don't like this. Less exceptions is better.
>
> This *SHOULD* never trigger on AMD anyway, because they recommend IO
> port C[23]. But if their partner BIOS engineer does a wobbly and they
> end up in MWAIT anyway, it *should* all work regardless.
Agreed.
I thought relaying on BIOS to not put FFH states there was a concern.
I believe Gautham confirmed that AMD would be fine executing that,
it's just that they prefer ioidle (or hlt?).