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[MIPS] 20K: Handle WAIT related bugs according to errata information

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We used to avoid the WAIT entirely on the 20K but really only need to do
this on early revs of the 20K.  Without this a 20K was a bit of a
power hog.  Well, in the lower power power hog category ;-)

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2007-06-12 13:04:09 +01:00
parent b0c10b9f4c
commit c8eae71dc8
1 changed files with 11 additions and 1 deletions
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12
arch/mips/kernel/cpu-probe.c
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@ -137,7 +137,6 @@ static inline void check_wait(void)
case CPU_4KEC:
case CPU_4KSC:
case CPU_5KC:
/* case CPU_20KC:*/
case CPU_24K:
case CPU_25KF:
case CPU_34K:
@ -156,6 +155,17 @@ static inline void check_wait(void)
if (allow_au1k_wait)
cpu_wait = au1k_wait;
break;
case CPU_20KC:
/*
* WAIT on Rev1.0 has E1, E2, E3 and E16.
* WAIT on Rev2.0 and Rev3.0 has E16.
* Rev3.1 WAIT is nop, why bother
*/
if ((c->processor_id & 0xff) <= 0x64)
break;
cpu_wait = r4k_wait;
break;
case CPU_RM9000:
if ((c->processor_id & 0x00ff) >= 0x40)
cpu_wait = r4k_wait;