linux-kernel - Re: DPTF_POWER and DPTF_PCH

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Message-ID: <d6cdf27b-04ef-7bc8-03ef-2115ca08bffe@intel.com>
Date:   Thu, 15 Oct 2020 13:31:55 +0200
From:   "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
To:     Borislav Petkov <bp@...en8.de>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:     lkml <linux-kernel@...r.kernel.org>, rafael@...nel.org,
        Linux ACPI <linux-acpi@...r.kernel.org>
Subject: Re: DPTF_POWER and DPTF_PCH_FIVR

On 10/15/2020 11:58 AM, Borislav Petkov wrote:
> On Thu, Oct 15, 2020 at 11:53:11AM +0200, Borislav Petkov wrote:
>> Dudes,
>>
>> what are those new symbols in Kconfig and why do they wanna get enabled
>> on my box when doing oldconfig? Depends on X86? Really, that widespread?

Well, they depend on ACPI too and it doesn't look like there is anything 
more fine grained that could be used here.

Also I'm not sure if adding ACPI_DPTF (bool, disabled by default and 
depending on x86) would help a lot.


>> The help text doesn't say why do I need this...
> And that thing in sysfs:
>
> "/sys/bus/platform/drivers/DPTF Platform Power"
>
> has spaces in the name. What's going on?!
>
Obviously an oversight on my part, sorry.

I think that changing it to "dptf_power" (and analogously for the FIVR 
participant driver) should work.  Srinivas?