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authorPaul Mackerras <paulus@samba.org>2006-03-28 09:28:14 +1100
committerPaul Mackerras <paulus@samba.org>2006-03-28 09:28:14 +1100
commitff2e6d7e27cf1f757ab0d97e1a9e46de47152a0e (patch)
tree3fc5952629df5cd6a5c3e49e44b3f43a2e0414bb
parent9618edab82fda8dbce5ea3abcdac9ded07abb2d4 (diff)
powerpc: Fix goof in 6xx and POWER4 idle power-save functions
This fixes a mistake I made when editing these functions - when I took out the interrupt disabling code (because interrupts are now disabled by the caller) I left the register that is used for the MSR value to be used during doze/nap uninitialized. This fixes it. Also updated some of the comments in idle_power4.S and removed some code that was copied over from idle_6xx.S but is no longer relevant (we don't ever clear the CPU_FTR_CAN_NAP bit at runtime for POWER4). Signed-off-by: Paul Mackerras <paulus@samba.org>
-rw-r--r--arch/powerpc/kernel/idle_6xx.S3
-rw-r--r--arch/powerpc/kernel/idle_power4.S23
2 files changed, 5 insertions, 21 deletions
diff --git a/arch/powerpc/kernel/idle_6xx.S b/arch/powerpc/kernel/idle_6xx.S
index 1647ea361ef..12a4efbaa08 100644
--- a/arch/powerpc/kernel/idle_6xx.S
+++ b/arch/powerpc/kernel/idle_6xx.S
@@ -144,7 +144,8 @@ BEGIN_FTR_SECTION
DSSALL
sync
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
- ori r7,r7,MSR_EE /* Could be ommited (already set) */
+ mfmsr r7
+ ori r7,r7,MSR_EE
oris r7,r7,MSR_POW@h
sync
isync
diff --git a/arch/powerpc/kernel/idle_power4.S b/arch/powerpc/kernel/idle_power4.S
index 692cf2ebe0f..6dad1c02496 100644
--- a/arch/powerpc/kernel/idle_power4.S
+++ b/arch/powerpc/kernel/idle_power4.S
@@ -1,11 +1,5 @@
/*
- * This file contains the power_save function for 6xx & 7xxx CPUs
- * rewritten in assembler
- *
- * Warning ! This code assumes that if your machine has a 750fx
- * it will have PLL 1 set to low speed mode (used during NAP/DOZE).
- * if this is not the case some additional changes will have to
- * be done to check a runtime var (a bit like powersave-nap)
+ * This file contains the power_save function for 970-family CPUs.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -26,23 +20,10 @@
.text
-/*
- * Here is the power_save_6xx function. This could eventually be
- * split into several functions & changing the function pointer
- * depending on the various features.
- */
_GLOBAL(power4_idle)
BEGIN_FTR_SECTION
blr
END_FTR_SECTION_IFCLR(CPU_FTR_CAN_NAP)
- /* We must dynamically check for the NAP feature as it
- * can be cleared by CPU init after the fixups are done
- */
- LOAD_REG_ADDRBASE(r3,cur_cpu_spec)
- ld r4,ADDROFF(cur_cpu_spec)(r3)
- ld r4,CPU_SPEC_FEATURES(r4)
- andi. r0,r4,CPU_FTR_CAN_NAP
- beqlr
/* Now check if user or arch enabled NAP mode */
LOAD_REG_ADDRBASE(r3,powersave_nap)
lwz r4,ADDROFF(powersave_nap)(r3)
@@ -54,6 +35,8 @@ BEGIN_FTR_SECTION
DSSALL
sync
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
+ mfmsr r7
+ ori r7,r7,MSR_EE
oris r7,r7,MSR_POW@h
sync
isync