Re: ACPI PCC probe failed.

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On Wednesday, February 04, 2015 06:38:39 PM Ashwin Chaugule wrote:
> On 4 February 2015 at 18:04, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote:
> > On Wednesday, February 04, 2015 05:06:26 PM Ashwin Chaugule wrote:
> >> > I have one more concern about this driver.  Namely, what benefit is there to
> >> > people like Cristian from it at all?
> >>
> >> Its of use only if they have a PCC client (MPST, CPPC, RAS) driver.
> >> Looks like PCC was explicitly enabled in this kernel.
> >>
> >> config PCC
> >> bool "Platform Communication Channel Driver"
> >> depends on ACPI
> >
> > Can we make it depend on the clients instead and be set automatically
> > when at least one of the clients is enabled?
> >
> > Otherwise distros will have a problem with deciding whether or not they
> > should enable this driver and most of them will end up enabling it.
> 
> I see your point, but I'm not aware of any upstreamed client as of
> yet. There might be folks using this driver internally though with
> other clients. In such a case, is there a way to keep PCC disabled
> until a client (e.g. CPPC) is upstreamed?

Make it depend on EXPERT or something like that until the first client is
added and then make it depend on that client. :-)

> Alternately, is it that bad to keep it the way it is, given that the
> driver wont do anything unless PCCT is detected in firmware and a PCC
> client explicitly uses its API?

Well, is it really useful this way?


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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