svn commit: r215101 - head/sys/powerpc/powerpc
Nathan Whitehorn
nwhitehorn at FreeBSD.org
Wed Nov 10 20:28:10 UTC 2010
Author: nwhitehorn
Date: Wed Nov 10 20:28:10 2010
New Revision: 215101
URL: http://svn.freebsd.org/changeset/base/215101
Log:
Entering deep nap mode on the 970MP requires that both MSR[NAP] and
MSR[DEEPNAP] be set, not just MSR[DEEPNAP]. Fixing this reduces the idle
temperature of my CPUs from 57 to 38 degrees and makes one-shot timer
mode work properly.
Hint from: mav
MFC after: 4 days
Modified:
head/sys/powerpc/powerpc/cpu.c
Modified: head/sys/powerpc/powerpc/cpu.c
==============================================================================
--- head/sys/powerpc/powerpc/cpu.c Wed Nov 10 20:09:05 2010 (r215100)
+++ head/sys/powerpc/powerpc/cpu.c Wed Nov 10 20:28:10 2010 (r215101)
@@ -455,8 +455,8 @@ cpu_970_setup(int cpuid, uint16_t vers)
/* Configure power-saving mode */
switch (vers) {
case IBM970MP:
- hid0_hi |= (HID0_DEEPNAP | HID0_DPM);
- hid0_hi &= ~(HID0_DOZE | HID0_NAP);
+ hid0_hi |= (HID0_DEEPNAP | HID0_NAP | HID0_DPM);
+ hid0_hi &= ~HID0_DOZE;
break;
default:
hid0_hi |= (HID0_NAP | HID0_DPM);
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