[GFS2] Fix up merge of Linus' kernel into GFS2

[pandora-kernel.git] / arch / i386 / kernel / cpu / cpufreq / speedstep-centrino.c

diff --git a/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c b/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
index 8d76550..7a93253 100644 (file)
--- a/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
+++ b/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
@@ -17,13 +17,13 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/cpufreq.h>
-#include <linux/config.h>
 #include <linux/sched.h>       /* current */
 #include <linux/delay.h>
 #include <linux/compiler.h>
 
 #ifdef CONFIG_X86_SPEEDSTEP_CENTRINO_ACPI
 #include <linux/acpi.h>
+#include <linux/dmi.h>
 #include <acpi/processor.h>
 #endif
 
@@ -378,6 +378,35 @@ static int centrino_cpu_early_init_acpi(void)
        return 0;
 }
 
+
+/*
+ * 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 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"),
+               },
+       },
+       { }
+};
+
+
 /*
  * centrino_cpu_init_acpi - register with ACPI P-States library
  *
@@ -399,14 +428,24 @@ static int centrino_cpu_init_acpi(struct cpufreq_policy *policy)
                dprintk(PFX "obtaining ACPI data failed\n");
                return -EIO;
        }
+
        policy->shared_type = p->shared_type;
        /*
         * Will let policy->cpus know about dependency only when software 
         * 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 = p->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
 
        /* verify the acpi_data */
        if (p->state_count <= 1) {