Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
[MIPS] 20K: Handle WAIT related bugs according to errata information
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>
+11
-1
arch/mips/kernel/cpu-probe.c
+11
-1
arch/mips/kernel/cpu-probe.c
···
137
137
case CPU_4KEC:
138
138
case CPU_4KSC:
139
139
case CPU_5KC:
140
-
/* case CPU_20KC:*/
141
140
case CPU_24K:
142
141
case CPU_25KF:
143
142
case CPU_34K:
···
154
155
case CPU_AU1200:
155
156
if (allow_au1k_wait)
156
157
cpu_wait = au1k_wait;
158
+
break;
159
+
case CPU_20KC:
160
+
/*
161
+
* WAIT on Rev1.0 has E1, E2, E3 and E16.
162
+
* WAIT on Rev2.0 and Rev3.0 has E16.
163
+
* Rev3.1 WAIT is nop, why bother
164
+
*/
165
+
if ((c->processor_id & 0xff) <= 0x64)
166
+
break;
167
+
168
+
cpu_wait = r4k_wait;
157
169
break;
158
170
case CPU_RM9000:
159
171
if ((c->processor_id & 0x00ff) >= 0x40)