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| author | Paul Mackerras <paulus@samba.org> | 2006-03-28 00:28:14 +0200 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-03-28 00:28:14 +0200 |
| commit | ff2e6d7e27cf1f757ab0d97e1a9e46de47152a0e (patch) | |
| tree | 3fc5952629df5cd6a5c3e49e44b3f43a2e0414bb /arch/powerpc/kernel/idle_power4.S | |
| parent | powerpc: Fix event-scan code for 32-bit CHRP (diff) | |
| download | linux-ff2e6d7e27cf1f757ab0d97e1a9e46de47152a0e.tar.xz linux-ff2e6d7e27cf1f757ab0d97e1a9e46de47152a0e.zip | |
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>
Diffstat (limited to 'arch/powerpc/kernel/idle_power4.S')
| -rw-r--r-- | arch/powerpc/kernel/idle_power4.S | 23 |
1 files changed, 3 insertions, 20 deletions
diff --git a/arch/powerpc/kernel/idle_power4.S b/arch/powerpc/kernel/idle_power4.S index 692cf2ebe0f4..6dad1c02496e 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 |