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authorVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>2005-08-29 13:54:55 -0700
committerDave Jones <davej@redhat.com>2005-08-31 22:21:29 -0700
commitf914be79ab2144efe291d9fc383661e0e23dca44 (patch)
treeb31042a3fe103a894a26611e16459f10b7b2cbaa /arch/i386
parent8085e1f1f0645fc6ddefcb54fdcba95808df5049 (diff)
[CPUFREQ] speedstep-centrino: skip extract_clock logic for acpi based centrino
speedstep_centrino.c:extract_clock() assumes the bus speed of 100MHz, which is not true with latest laptops. Due to this assumption and due to the encoded frequency check during initialization, speedstep-centrino driver fails even on systems that has proper ACPI information to do the P-state transition. The change below moves the centrino-speedstep detection to be used only when table based P-state transition is done. For ACPI based P-state transition, we skip the centrino_cpu identification, and as a result we don't use the bus speed assumption in extract_clock. This change makes speedstep-centrino work on Pentium-M based systems, which have more than 100MHz bus speed. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Dave Jones <davej@redhat.com>
Diffstat (limited to 'arch/i386')
-rw-r--r--arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c b/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
index 327a55d4d1c..95e15b7fce1 100644
--- a/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
+++ b/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
@@ -498,13 +498,6 @@ static int centrino_cpu_init(struct cpufreq_policy *policy)
if (cpu->x86_vendor != X86_VENDOR_INTEL || !cpu_has(cpu, X86_FEATURE_EST))
return -ENODEV;
- for (i = 0; i < N_IDS; i++)
- if (centrino_verify_cpu_id(cpu, &cpu_ids[i]))
- break;
-
- if (i != N_IDS)
- centrino_cpu[policy->cpu] = &cpu_ids[i];
-
if (is_const_loops_cpu(policy->cpu)) {
centrino_driver.flags |= CPUFREQ_CONST_LOOPS;
}
@@ -513,6 +506,13 @@ static int centrino_cpu_init(struct cpufreq_policy *policy)
if (policy->cpu != 0)
return -ENODEV;
+ for (i = 0; i < N_IDS; i++)
+ if (centrino_verify_cpu_id(cpu, &cpu_ids[i]))
+ break;
+
+ if (i != N_IDS)
+ centrino_cpu[policy->cpu] = &cpu_ids[i];
+
if (!centrino_cpu[policy->cpu]) {
dprintk(KERN_INFO PFX "found unsupported CPU with "
"Enhanced SpeedStep: send /proc/cpuinfo to "