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authorBorislav Petkov <borislav.petkov@amd.com>2010-07-08 17:55:30 +0200
committerDave Jones <davej@redhat.com>2010-08-03 13:47:03 -0400
commitc2f4a2c6e08c7635316dfd25ef706e9104384c56 (patch)
tree5898daaec6234995e176378dcf8791b082814e41 /arch
parent6ebdf777ba034d2b54c99f28a4b18dabf286d8e5 (diff)
downloadop-kernel-dev-c2f4a2c6e08c7635316dfd25ef706e9104384c56.zip
op-kernel-dev-c2f4a2c6e08c7635316dfd25ef706e9104384c56.tar.gz
[CPUFREQ] powernow-k8: Limit Pstate transition latency check
The Pstate transition latency check was added for broken F10h BIOSen which wrongly contain a value of 0 for transition and bus master latency. Fam11h and later, however, (will) have similar transition latency so extend that behavior for them too. Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/cpu/cpufreq/powernow-k8.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
index 7ec2123..3e90cce 100644
--- a/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/x86/kernel/cpu/cpufreq/powernow-k8.c
@@ -1023,13 +1023,12 @@ static int get_transition_latency(struct powernow_k8_data *data)
}
if (max_latency == 0) {
/*
- * Fam 11h always returns 0 as transition latency.
- * This is intended and means "very fast". While cpufreq core
- * and governors currently can handle that gracefully, better
- * set it to 1 to avoid problems in the future.
- * For all others it's a BIOS bug.
+ * Fam 11h and later may return 0 as transition latency. This
+ * is intended and means "very fast". While cpufreq core and
+ * governors currently can handle that gracefully, better set it
+ * to 1 to avoid problems in the future.
*/
- if (boot_cpu_data.x86 != 0x11)
+ if (boot_cpu_data.x86 < 0x11)
printk(KERN_ERR FW_WARN PFX "Invalid zero transition "
"latency\n");
max_latency = 1;
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