[Skiboot] [PATCH 1/2] SLW: Remove stop1_lite and stop0 stop states

Stewart Smith stewart at linux.vnet.ibm.com
Mon May 7 01:37:07 AEST 2018

Michael Ellerman <mpe at ellerman.id.au> writes:
> Stewart Smith <stewart at linux.vnet.ibm.com> writes:
> ...
>> Slightly stupid question: should we be disabling these here or should
>> Linux be better and deciding what states to use?
>> I'm inclined to say this is a Linux problem as it should make the
>> decision of what hardware feature to used based on the ones OPAL says
>> *can* be used.
> Yeah I agree.
> Firmware shouldn't be implementing the policy around what states to use,
> it should tell the operating system (which might be Linux) what states
> are available and what their features are.

Yeah... I think I should work out somewhere to put this in the
documentation, a kind of design philosophy we can point back to.

> The exception to that would be that we have unfixable crash bugs in
> existing kernels, in that case firmware might have to filter out states
> that are known to cause those.

s/in/with/ and *cough* stop11 for example.

Stewart Smith
OPAL Architect, IBM.

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