Module Name: src
Committed By: jruoho
Date: Tue Nov 15 07:43:37 UTC 2011
Modified Files:
src/sys/dev/acpi: acpi_cpu_pstate.c
Log Message:
Add comment.
To generate a diff of this commit:
cvs rdiff -u -r1.52 -r1.53 src/sys/dev/acpi/acpi_cpu_pstate.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/dev/acpi/acpi_cpu_pstate.c
diff -u src/sys/dev/acpi/acpi_cpu_pstate.c:1.52 src/sys/dev/acpi/acpi_cpu_pstate.c:1.53
--- src/sys/dev/acpi/acpi_cpu_pstate.c:1.52 Tue Oct 18 05:08:24 2011
+++ src/sys/dev/acpi/acpi_cpu_pstate.c Tue Nov 15 07:43:37 2011
@@ -1,4 +1,4 @@
-/* $NetBSD: acpi_cpu_pstate.c,v 1.52 2011/10/18 05:08:24 jruoho Exp $ */
+/* $NetBSD: acpi_cpu_pstate.c,v 1.53 2011/11/15 07:43:37 jruoho Exp $ */
/*-
* Copyright (c) 2010, 2011 Jukka Ruohonen <jruoho...@iki.fi>
@@ -27,7 +27,7 @@
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: acpi_cpu_pstate.c,v 1.52 2011/10/18 05:08:24 jruoho Exp $");
+__KERNEL_RCSID(0, "$NetBSD: acpi_cpu_pstate.c,v 1.53 2011/11/15 07:43:37 jruoho Exp $");
#include <sys/param.h>
#include <sys/cpufreq.h>
@@ -337,6 +337,15 @@ acpicpu_pstate_pss_add(struct acpicpu_ps
if (ps->ps_freq == 0 || ps->ps_freq > 9999)
return AE_BAD_DECIMAL_CONSTANT;
+ /*
+ * Sanity check also the latency levels. Some systems may
+ * report a value zero, but we keep one microsecond as the
+ * lower bound; see for instance AMD family 12h,
+ *
+ * Advanced Micro Devices: BIOS and Kernel Developer's
+ * Guide (BKDG) for AMD Family 12h Processors. Section
+ * 2.5.3.1.9.2, Revision 3.02, October, 2011.
+ */
if (ps->ps_latency == 0 || ps->ps_latency > 1000)
ps->ps_latency = 1;
