Date: Thu, 19 Feb 2009 14:39:52 +0000 (UTC) From: Andriy Gapon <avg@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/dev/acpica acpi_cpu.c Message-ID: <200902191439.n1JEduKb067779@repoman.freebsd.org>
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avg 2009-02-19 14:39:52 UTC
FreeBSD src repository
Modified files:
sys/dev/acpica acpi_cpu.c
Log:
SVN rev 188814 on 2009-02-19 14:39:52Z by avg
acpi_cpu: fixup for PIIX4E PCI config related to C2
This is triggered only if BIOS configures ACPI_BITREG_BUS_MASTER_RLD
aka BRLD_EN_BM to 1.
Rationale:
1. we do not support C3 on PIIX4E
2. bus master activity need not break out of C2 state
3. because of CPU_QUIRK_NO_BM_CTRL quirk we may reset bus master
status which would result in immediate break out from C2
So if you have seen
cpu0: too many short sleeps, backing off to C1
with this chipset before you may want to try cx_lowest of C2 again.
Reviewed by: rpaulo (mentor), njl
Approved by: rpaulo (mentor)
Revision Changes Path
1.73 +11 -1 src/sys/dev/acpica/acpi_cpu.c
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