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authorAndreas Herrmann <andreas.herrmann3@amd.com>2012-01-06 15:56:31 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-02-13 11:06:13 -0800
commit2d8a3a209b35f8301c86e7962f636a372a0d7cad (patch)
treedaba1cd29f54ae146fa4aa38d63c740259e0f18f /drivers/cpufreq
parentebc5010892742064d7436a1c1ff91b3189c4b8c7 (diff)
powernow-k8: Avoid Pstate MSR accesses on systems supporting CPB
commit 201bf0f129e1715a33568d1563d9a75b840ab4d3 upstream. Due to CPB we can't directly map SW Pstates to Pstate MSRs. Get rid of the paranoia check. (assuming that the ACPI Pstate information is correct.) Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com> Signed-off-by: Dave Jones <davej@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/powernow-k8.c19
1 files changed, 10 insertions, 9 deletions
diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
index bce576d7478e..e0329f9fa40e 100644
--- a/drivers/cpufreq/powernow-k8.c
+++ b/drivers/cpufreq/powernow-k8.c
@@ -926,23 +926,24 @@ static int fill_powernow_table_pstate(struct powernow_k8_data *data,
invalidate_entry(powernow_table, i);
continue;
}
- rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
- if (!(hi & HW_PSTATE_VALID_MASK)) {
- pr_debug("invalid pstate %d, ignoring\n", index);
- invalidate_entry(powernow_table, i);
- continue;
- }
-
- powernow_table[i].index = index;
-
/* Frequency may be rounded for these */
if ((boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model < 10)
|| boot_cpu_data.x86 == 0x11) {
+
+ rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
+ if (!(hi & HW_PSTATE_VALID_MASK)) {
+ pr_debug("invalid pstate %d, ignoring\n", index);
+ invalidate_entry(powernow_table, i);
+ continue;
+ }
+
powernow_table[i].frequency =
freq_from_fid_did(lo & 0x3f, (lo >> 6) & 7);
} else
powernow_table[i].frequency =
data->acpi_data.states[i].core_frequency * 1000;
+
+ powernow_table[i].index = index;
}
return 0;
}