Date: Tue, 25 Oct 2005 21:15:47 +0000 (UTC) From: Nate Lawson <njl@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/dev/acpica acpi_cpu.c Message-ID: <200510252115.j9PLFl72055905@repoman.freebsd.org>
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njl 2005-10-25 21:15:47 UTC
FreeBSD src repository
Modified files:
sys/dev/acpica acpi_cpu.c
Log:
If we're trying to use C2/3 and reads from the register are returning
immediately, back off to the next higher Cx sleep state. Some machines
with a Via chipset report a valid C3 but a register read doesn't actually
halt the CPU. This would cause the machine to appear unresponsive as it
repeatedly called cpu_idle() which immediately returned. Causing interrupts
(i.e. by pressing the power button) would cause the system to make forward
progress, showing that it wasn't actually hung.
Also, enable interrupts a little earlier. We don't need them disabled
to calculate the delta time for the read.
Reported by: silby
MFC after: 2 weeks
Revision Changes Path
1.59 +24 -3 src/sys/dev/acpica/acpi_cpu.c
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