MIPS 20Kc and WAIT instruction

[Aurelien Jarno <aurelien@aurel32.net>]

Hi all,

The latest kernels from kernel.org or linux-mips.org do not enter low
power mode when the CPU is idle on a MIPS 20Kc CPU.

Looking at the code in arch/mips/kernel/cpu-probe.c, the "case"
corresponding to the 20Kc CPU is commented out:

        case CPU_5KC:
/*      case CPU_20KC:*/
        case CPU_24K:

According to the datasheet this CPU supports the WAIT instruction, so I
don't really understand why it is disabled in the kernel. Does anybody
know why?

Thanks,
Aurelien

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