diff options
author | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-22 17:50:22 -0700 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-22 17:50:22 -0700 |
commit | 2ee8099f2c2bc74a7c2fac7f83e12a5d651681d3 (patch) | |
tree | 433ebb87a3d5d02e7df3700c846ac9af632c55f3 /arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c | |
parent | c03efdb202a4882f426ce49766859af4058c9b8a (diff) | |
parent | 24669f7d00d387799fc6a39452ab22d7f078f043 (diff) |
Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq
* master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq:
[CPUFREQ] sw_any_bug_dmi_table can be used on resume, so it isn't initdata
[CPUFREQ] Fix some more CPU hotplug locking.
[CPUFREQ] Workaround for BIOS bug in software coordination of frequency
[CPUFREQ] Longhaul - Add voltage scaling to driver
[CPUFREQ] Fix sparse warning in ondemand
[CPUFREQ] make drivers/cpufreq/cpufreq_ondemand.c:powersave_bias_target() static
[CPUFREQ] Longhaul - Add ignore_latency option
[CPUFREQ] Longhaul - Disable arbiter
[CPUFREQ][2/2] ondemand: updated add powersave_bias tunable
[CPUFREQ][1/2] ondemand: updated tune for hardware coordination
[CPUFREQ] Fix typo.
Diffstat (limited to 'arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c')
-rw-r--r-- | arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c index e6ea00edcb54..ea19d091fd41 100644 --- a/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c +++ b/arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c @@ -32,6 +32,7 @@ #include <linux/seq_file.h> #include <linux/compiler.h> #include <linux/sched.h> /* current */ +#include <linux/dmi.h> #include <asm/io.h> #include <asm/delay.h> #include <asm/uaccess.h> @@ -387,6 +388,33 @@ static int acpi_cpufreq_early_init_acpi(void) return acpi_processor_preregister_performance(acpi_perf_data); } +/* + * Some BIOSes do SW_ANY coordination internally, either set it up in hw + * or do it in BIOS firmware and won't inform about it to OS. If not + * detected, this has a side effect of making CPU run at a different speed + * than OS intended it to run at. Detect it and handle it cleanly. + */ +static int bios_with_sw_any_bug; + +static int __init sw_any_bug_found(struct dmi_system_id *d) +{ + bios_with_sw_any_bug = 1; + return 0; +} + +static struct dmi_system_id __initdata sw_any_bug_dmi_table[] = { + { + .callback = sw_any_bug_found, + .ident = "Supermicro Server X6DLP", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"), + DMI_MATCH(DMI_BIOS_VERSION, "080010"), + DMI_MATCH(DMI_PRODUCT_NAME, "X6DLP"), + }, + }, + { } +}; + static int acpi_cpufreq_cpu_init ( struct cpufreq_policy *policy) @@ -422,8 +450,17 @@ acpi_cpufreq_cpu_init ( * coordination is required. */ if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL || - policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) + policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) { policy->cpus = perf->shared_cpu_map; + } + +#ifdef CONFIG_SMP + dmi_check_system(sw_any_bug_dmi_table); + if (bios_with_sw_any_bug && cpus_weight(policy->cpus) == 1) { + policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; + policy->cpus = cpu_core_map[cpu]; + } +#endif if (cpu_has(c, X86_FEATURE_CONSTANT_TSC)) { acpi_cpufreq_driver.flags |= CPUFREQ_CONST_LOOPS; |