acpi_cpu: _PDC vs _OSC

[Andriy Gapon]

on 04/02/2010 23:57 John Baldwin said the following:
> On Thursday 04 February 2010 2:42:47 pm Andriy Gapon wrote:
>> -	 * TODO: evaluate failure of _OSC.
>> +	 * On some systems evaluation of _OSC/_PDC dynamically
>> +	 * loads the _PSS and other methods.
>>  	 */
> 
> I would only say _OSC here.  I don't think we've seen any systems that load 
> something when _PDC is invoked, only when _OSC is invoked.

Actually, I think that the way it's written should be OK.
I've seen a few DSDTs where both are present and both do the same thing.
E.g.:

    Scope (\_PR.CPU0)
    {
        Name (HI0, Zero)
        Name (HC0, Zero)
        Method (_PDC, 1, NotSerialized)
        {
            Store (CPDC (Arg0), Local0)
            GCAP (Local0)
            Return (Local0)
        }

        Method (_OSC, 4, NotSerialized)
        {
            Store (COSC (Arg0, Arg1, Arg2, Arg3), Local0)
            GCAP (Local0)
            Return (Local0)
        }
...

Looks like CPDC is "Convert _PDC" and COSC is "Convert _OSC" and GCAP is "G...
capabilities", whatever "G..." could mean.

-- 
Andriy Gapon