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.

7 files changed, 391 insertions, 101 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;
diff --git a/arch/i386/kernel/cpu/cpufreq/longhaul.c b/arch/i386/kernel/cpu/cpufreq/longhaul.c
index 4f2c3aeef724..f5cc9f5c9bab 100644
--- a/arch/i386/kernel/cpu/cpufreq/longhaul.c
+++ b/arch/i386/kernel/cpu/cpufreq/longhaul.c
@@ -27,6 +27,7 @@
 #include <linux/moduleparam.h>
 #include <linux/init.h>
 #include <linux/cpufreq.h>
+#include <linux/pci.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 
@@ -52,18 +53,26 @@
 #define CPU_NEHEMIAH    5
 
 static int cpu_model;
-static unsigned int numscales=16, numvscales;
+static unsigned int numscales=16;
 static unsigned int fsb;
-static int minvid, maxvid;
+
+static struct mV_pos *vrm_mV_table;
+static unsigned char *mV_vrm_table;
+struct f_msr {
+        unsigned char vrm;
+};
+static struct f_msr f_msr_table[32];
+
+static unsigned int highest_speed, lowest_speed; /* kHz */
 static unsigned int minmult, maxmult;
 static int can_scale_voltage;
-static int vrmrev;
 static struct acpi_processor *pr = NULL;
 static struct acpi_processor_cx *cx = NULL;
+static int port22_en;
 
 /* Module parameters */
-static int dont_scale_voltage;
-
+static int scale_voltage;
+static int ignore_latency;
 
 #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "longhaul", msg)
 
@@ -71,7 +80,6 @@ static int dont_scale_voltage;
 /* Clock ratios multiplied by 10 */
 static int clock_ratio[32];
 static int eblcr_table[32];
-static int voltage_table[32];
 static unsigned int highest_speed, lowest_speed; /* kHz */
 static int longhaul_version;
 static struct cpufreq_frequency_table *longhaul_table;
@@ -124,10 +132,9 @@ static int longhaul_get_cpu_mult(void)
 
 /* For processor with BCR2 MSR */
 
-static void do_longhaul1(int cx_address, unsigned int clock_ratio_index)
+static void do_longhaul1(unsigned int clock_ratio_index)
 {
         union msr_bcr2 bcr2;
-        u32 t;
 
         rdmsrl(MSR_VIA_BCR2, bcr2.val);
         /* Enable software clock multiplier */
@@ -136,13 +143,11 @@ static void do_longhaul1(int cx_address, unsigned int clock_ratio_index)
 
         /* Sync to timer tick */
         safe_halt();
-        ACPI_FLUSH_CPU_CACHE();
         /* Change frequency on next halt or sleep */
         wrmsrl(MSR_VIA_BCR2, bcr2.val);
-        /* Invoke C3 */
-        inb(cx_address);
-        /* Dummy op - must do something useless after P_LVL3 read */
-        t = inl(acpi_fadt.xpm_tmr_blk.address);
+        /* Invoke transition */
+        ACPI_FLUSH_CPU_CACHE();
+        halt();
 
         /* Disable software clock multiplier */
         local_irq_disable();
@@ -164,11 +169,16 @@ static void do_powersaver(int cx_address, unsigned int clock_ratio_index)
         longhaul.bits.SoftBusRatio4 = (clock_ratio_index & 0x10) >> 4;
         longhaul.bits.EnableSoftBusRatio = 1;
 
+        if (can_scale_voltage) {
+                longhaul.bits.SoftVID = f_msr_table[clock_ratio_index].vrm;
+                longhaul.bits.EnableSoftVID = 1;
+        }
+
         /* Sync to timer tick */
         safe_halt();
-        ACPI_FLUSH_CPU_CACHE();
         /* Change frequency on next halt or sleep */
         wrmsrl(MSR_VIA_LONGHAUL, longhaul.val);
+        ACPI_FLUSH_CPU_CACHE();
         /* Invoke C3 */
         inb(cx_address);
         /* Dummy op - must do something useless after P_LVL3 read */
@@ -227,10 +237,13 @@ static void longhaul_setstate(unsigned int clock_ratio_index)
         outb(0xFF,0xA1);        /* Overkill */
         outb(0xFE,0x21);        /* TMR0 only */
 
-        /* Disable bus master arbitration */
-        if (pr->flags.bm_check) {
+        if (pr->flags.bm_control) {
+                /* Disable bus master arbitration */
                 acpi_set_register(ACPI_BITREG_ARB_DISABLE, 1,
                                   ACPI_MTX_DO_NOT_LOCK);
+        } else if (port22_en) {
+                /* Disable AGP and PCI arbiters */
+                outb(3, 0x22);
         }
 
         switch (longhaul_version) {
@@ -244,7 +257,7 @@ static void longhaul_setstate(unsigned int clock_ratio_index)
          */
         case TYPE_LONGHAUL_V1:
         case TYPE_LONGHAUL_V2:
-                do_longhaul1(cx->address, clock_ratio_index);
+                do_longhaul1(clock_ratio_index);
                 break;
 
         /*
@@ -259,14 +272,20 @@ static void longhaul_setstate(unsigned int clock_ratio_index)
          * to work in practice.
          */
         case TYPE_POWERSAVER:
+                /* Don't allow wakeup */
+                acpi_set_register(ACPI_BITREG_BUS_MASTER_RLD, 0,
+                                  ACPI_MTX_DO_NOT_LOCK);
                 do_powersaver(cx->address, clock_ratio_index);
                 break;
         }
 
-        /* Enable bus master arbitration */
-        if (pr->flags.bm_check) {
+        if (pr->flags.bm_control) {
+                /* Enable bus master arbitration */
                 acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0,
                                   ACPI_MTX_DO_NOT_LOCK);
+        } else if (port22_en) {
+                /* Enable arbiters */
+                outb(0, 0x22);
         }
 
         outb(pic2_mask,0xA1);   /* restore mask */
@@ -446,53 +465,57 @@ static int __init longhaul_get_ranges(void)
 static void __init longhaul_setup_voltagescaling(void)
 {
         union msr_longhaul longhaul;
+        struct mV_pos minvid, maxvid;
+        unsigned int j, speed, pos, kHz_step, numvscales;
 
-        rdmsrl (MSR_VIA_LONGHAUL, longhaul.val);
-
-        if (!(longhaul.bits.RevisionID & 1))
+        rdmsrl(MSR_VIA_LONGHAUL, longhaul.val);
+        if (!(longhaul.bits.RevisionID & 1)) {
+                printk(KERN_INFO PFX "Voltage scaling not supported by CPU.\n");
                 return;
+        }
+
+        if (!longhaul.bits.VRMRev) {
+                printk (KERN_INFO PFX "VRM 8.5\n");
+                vrm_mV_table = &vrm85_mV[0];
+                mV_vrm_table = &mV_vrm85[0];
+        } else {
+                printk (KERN_INFO PFX "Mobile VRM\n");
+                vrm_mV_table = &mobilevrm_mV[0];
+                mV_vrm_table = &mV_mobilevrm[0];
+        }
 
-        minvid = longhaul.bits.MinimumVID;
-        maxvid = longhaul.bits.MaximumVID;
-        vrmrev = longhaul.bits.VRMRev;
+        minvid = vrm_mV_table[longhaul.bits.MinimumVID];
+        maxvid = vrm_mV_table[longhaul.bits.MaximumVID];
+        numvscales = maxvid.pos - minvid.pos + 1;
+        kHz_step = (highest_speed - lowest_speed) / numvscales;
 
-        if (minvid == 0 || maxvid == 0) {
+        if (minvid.mV == 0 || maxvid.mV == 0 || minvid.mV > maxvid.mV) {
                 printk (KERN_INFO PFX "Bogus values Min:%d.%03d Max:%d.%03d. "
                                         "Voltage scaling disabled.\n",
-                                        minvid/1000, minvid%1000, maxvid/1000, maxvid%1000);
+                                        minvid.mV/1000, minvid.mV%1000, maxvid.mV/1000, maxvid.mV%1000);
                 return;
         }
 
-        if (minvid == maxvid) {
+        if (minvid.mV == maxvid.mV) {
                 printk (KERN_INFO PFX "Claims to support voltage scaling but min & max are "
                                 "both %d.%03d. Voltage scaling disabled\n",
-                                maxvid/1000, maxvid%1000);
+                                maxvid.mV/1000, maxvid.mV%1000);
                 return;
         }
 
-        if (vrmrev==0) {
-                dprintk ("VRM 8.5\n");
-                memcpy (voltage_table, vrm85scales, sizeof(voltage_table));
-                numvscales = (voltage_table[maxvid]-voltage_table[minvid])/25;
-        } else {
-                dprintk ("Mobile VRM\n");
-                memcpy (voltage_table, mobilevrmscales, sizeof(voltage_table));
-                numvscales = (voltage_table[maxvid]-voltage_table[minvid])/5;
+        printk(KERN_INFO PFX "Max VID=%d.%03d  Min VID=%d.%03d, %d possible voltage scales\n",
+                maxvid.mV/1000, maxvid.mV%1000,
+                minvid.mV/1000, minvid.mV%1000,
+                numvscales);
+        
+        j = 0;
+        while (longhaul_table[j].frequency != CPUFREQ_TABLE_END) {
+                speed = longhaul_table[j].frequency;
+                pos = (speed - lowest_speed) / kHz_step + minvid.pos;
+                f_msr_table[longhaul_table[j].index].vrm = mV_vrm_table[pos];
+                j++;
         }
 
-        /* Current voltage isn't readable at first, so we need to
-           set it to a known value. The spec says to use maxvid */
-        longhaul.bits.RevisionKey = longhaul.bits.RevisionID;   /* FIXME: This is bad. */
-        longhaul.bits.EnableSoftVID = 1;
-        longhaul.bits.SoftVID = maxvid;
-        wrmsrl (MSR_VIA_LONGHAUL, longhaul.val);
-
-        minvid = voltage_table[minvid];
-        maxvid = voltage_table[maxvid];
-
-        dprintk ("Min VID=%d.%03d Max VID=%d.%03d, %d possible voltage scales\n",
-                maxvid/1000, maxvid%1000, minvid/1000, minvid%1000, numvscales);
-
         can_scale_voltage = 1;
 }
 
@@ -540,21 +563,33 @@ static acpi_status longhaul_walk_callback(acpi_handle obj_handle,
         return 1;
 }
 
+/* VIA don't support PM2 reg, but have something similar */
+static int enable_arbiter_disable(void)
+{
+        struct pci_dev *dev;
+        u8 pci_cmd;
+
+        /* Find PLE133 host bridge */
+        dev = pci_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8601_0, NULL);
+        if (dev != NULL) {
+                /* Enable access to port 0x22 */
+                pci_read_config_byte(dev, 0x78, &pci_cmd);
+                if ( !(pci_cmd & 1<<7) ) {
+                        pci_cmd |= 1<<7;
+                        pci_write_config_byte(dev, 0x78, pci_cmd);
+                }
+                return 1;
+        }
+        return 0;
+}
+
 static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
 {
         struct cpuinfo_x86 *c = cpu_data;
         char *cpuname=NULL;
         int ret;
 
-        /* Check ACPI support for C3 state */
-        acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
-                         &longhaul_walk_callback, NULL, (void *)&pr);
-        if (pr == NULL) goto err_acpi;
-
-        cx = &pr->power.states[ACPI_STATE_C3];
-        if (cx->address == 0 || cx->latency > 1000) goto err_acpi;
-
-        /* Now check what we have on this motherboard */
+        /* Check what we have on this motherboard */
         switch (c->x86_model) {
         case 6:
                 cpu_model = CPU_SAMUEL;
@@ -636,12 +671,36 @@ static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
                 break;
         };
 
+        /* Find ACPI data for processor */
+        acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
+                            &longhaul_walk_callback, NULL, (void *)&pr);
+        if (pr == NULL)
+                goto err_acpi;
+
+        if (longhaul_version == TYPE_POWERSAVER) {
+                /* Check ACPI support for C3 state */
+                cx = &pr->power.states[ACPI_STATE_C3];
+                if (cx->address == 0 ||
+                   (cx->latency > 1000 && ignore_latency == 0) )
+                        goto err_acpi;
+
+        } else {
+                /* Check ACPI support for bus master arbiter disable */
+                if (!pr->flags.bm_control) {
+                        if (!enable_arbiter_disable()) {
+                                printk(KERN_ERR PFX "No ACPI support. No VT8601 host bridge. Aborting.\n");
+                                return -ENODEV;
+                        } else
+                                port22_en = 1;
+                }
+        }
+
         ret = longhaul_get_ranges();
         if (ret != 0)
                 return ret;
 
         if ((longhaul_version==TYPE_LONGHAUL_V2 || longhaul_version==TYPE_POWERSAVER) &&
-                 (dont_scale_voltage==0))
+                 (scale_voltage != 0))
                 longhaul_setup_voltagescaling();
 
         policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
@@ -729,8 +788,10 @@ static void __exit longhaul_exit(void)
         kfree(longhaul_table);
 }
 
-module_param (dont_scale_voltage, int, 0644);
-MODULE_PARM_DESC(dont_scale_voltage, "Don't scale voltage of processor");
+module_param (scale_voltage, int, 0644);
+MODULE_PARM_DESC(scale_voltage, "Scale voltage of processor");
+module_param(ignore_latency, int, 0644);
+MODULE_PARM_DESC(ignore_latency, "Skip ACPI C3 latency test");
 
 MODULE_AUTHOR ("Dave Jones <davej@codemonkey.org.uk>");
 MODULE_DESCRIPTION ("Longhaul driver for VIA Cyrix processors.");
@@ -738,4 +799,3 @@ MODULE_LICENSE ("GPL");
 
 late_initcall(longhaul_init);
 module_exit(longhaul_exit);
-
diff --git a/arch/i386/kernel/cpu/cpufreq/longhaul.h b/arch/i386/kernel/cpu/cpufreq/longhaul.h
index d3a95d77ee85..bc4682aad69b 100644
--- a/arch/i386/kernel/cpu/cpufreq/longhaul.h
+++ b/arch/i386/kernel/cpu/cpufreq/longhaul.h
@@ -450,17 +450,45 @@ static int __initdata nehemiah_c_eblcr[32] = {
  * Voltage scales. Div/Mod by 1000 to get actual voltage.
  * Which scale to use depends on the VRM type in use.
  */
-static int __initdata vrm85scales[32] = {
-        1250, 1200, 1150, 1100, 1050, 1800, 1750, 1700,
-        1650, 1600, 1550, 1500, 1450, 1400, 1350, 1300,
-        1275, 1225, 1175, 1125, 1075, 1825, 1775, 1725,
-        1675, 1625, 1575, 1525, 1475, 1425, 1375, 1325,
+
+struct mV_pos {
+        unsigned short mV;
+        unsigned short pos;
+};
+
+static struct mV_pos __initdata vrm85_mV[32] = {
+        {1250, 8},      {1200, 6},      {1150, 4},      {1100, 2},
+        {1050, 0},      {1800, 30},     {1750, 28},     {1700, 26},
+        {1650, 24},     {1600, 22},     {1550, 20},     {1500, 18},
+        {1450, 16},     {1400, 14},     {1350, 12},     {1300, 10},
+        {1275, 9},      {1225, 7},      {1175, 5},      {1125, 3},
+        {1075, 1},      {1825, 31},     {1775, 29},     {1725, 27},
+        {1675, 25},     {1625, 23},     {1575, 21},     {1525, 19},
+        {1475, 17},     {1425, 15},     {1375, 13},     {1325, 11}
+};
+
+static unsigned char __initdata mV_vrm85[32] = {
+        0x04,   0x14,   0x03,   0x13,   0x02,   0x12,   0x01,   0x11,
+        0x00,   0x10,   0x0f,   0x1f,   0x0e,   0x1e,   0x0d,   0x1d,
+        0x0c,   0x1c,   0x0b,   0x1b,   0x0a,   0x1a,   0x09,   0x19,
+        0x08,   0x18,   0x07,   0x17,   0x06,   0x16,   0x05,   0x15
+};
+
+static struct mV_pos __initdata mobilevrm_mV[32] = {
+        {1750, 31},     {1700, 30},     {1650, 29},     {1600, 28},
+        {1550, 27},     {1500, 26},     {1450, 25},     {1400, 24},
+        {1350, 23},     {1300, 22},     {1250, 21},     {1200, 20},
+        {1150, 19},     {1100, 18},     {1050, 17},     {1000, 16},
+        {975, 15},      {950, 14},      {925, 13},      {900, 12},
+        {875, 11},      {850, 10},      {825, 9},       {800, 8},
+        {775, 7},       {750, 6},       {725, 5},       {700, 4},
+        {675, 3},       {650, 2},       {625, 1},       {600, 0}
 };
 
-static int __initdata mobilevrmscales[32] = {
-        2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650,
-        1600, 1550, 1500, 1450, 1500, 1350, 1300, -1,
-        1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100,
-        1075, 1050, 1025, 1000, 975, 950, 925, -1,
+static unsigned char __initdata mV_mobilevrm[32] = {
+        0x1f,   0x1e,   0x1d,   0x1c,   0x1b,   0x1a,   0x19,   0x18,
+        0x17,   0x16,   0x15,   0x14,   0x13,   0x12,   0x11,   0x10,
+        0x0f,   0x0e,   0x0d,   0x0c,   0x0b,   0x0a,   0x09,   0x08,
+        0x07,   0x06,   0x05,   0x04,   0x03,   0x02,   0x01,   0x00
 };
 
diff --git a/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c b/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
index b77f1358bd79..7a9325349e94 100644
--- a/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
+++ b/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
@@ -23,6 +23,7 @@
 
 #ifdef CONFIG_X86_SPEEDSTEP_CENTRINO_ACPI
 #include <linux/acpi.h>
+#include <linux/dmi.h>
 #include <acpi/processor.h>
 #endif
 
@@ -377,6 +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
  *
@@ -398,14 +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) {
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index b3df613ae4ec..d35a9f06ab7b 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -32,7 +32,7 @@
 #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, "cpufreq-core", msg)
 
 /**
- * The "cpufreq driver" - the arch- or hardware-dependend low
+ * The "cpufreq driver" - the arch- or hardware-dependent low
  * level driver of CPUFreq support, and its spinlock. This lock
  * also protects the cpufreq_cpu_data array.
  */
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 52cf1f021825..bf8aa45d4f01 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -55,6 +55,10 @@ struct cpu_dbs_info_s {
         struct cpufreq_policy *cur_policy;
         struct work_struct work;
         unsigned int enable;
+        struct cpufreq_frequency_table *freq_table;
+        unsigned int freq_lo;
+        unsigned int freq_lo_jiffies;
+        unsigned int freq_hi_jiffies;
 };
 static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info);
 
@@ -72,15 +76,15 @@ static DEFINE_MUTEX(dbs_mutex);
 
 static struct workqueue_struct  *kondemand_wq;
 
-struct dbs_tuners {
+static struct dbs_tuners {
         unsigned int sampling_rate;
         unsigned int up_threshold;
         unsigned int ignore_nice;
-};
-
-static struct dbs_tuners dbs_tuners_ins = {
+        unsigned int powersave_bias;
+} dbs_tuners_ins = {
         .up_threshold = DEF_FREQUENCY_UP_THRESHOLD,
         .ignore_nice = 0,
+        .powersave_bias = 0,
 };
 
 static inline cputime64_t get_cpu_idle_time(unsigned int cpu)
@@ -96,6 +100,70 @@ static inline cputime64_t get_cpu_idle_time(unsigned int cpu)
         return retval;
 }
 
+/*
+ * Find right freq to be set now with powersave_bias on.
+ * Returns the freq_hi to be used right now and will set freq_hi_jiffies,
+ * freq_lo, and freq_lo_jiffies in percpu area for averaging freqs.
+ */
+static unsigned int powersave_bias_target(struct cpufreq_policy *policy,
+                                          unsigned int freq_next,
+                                          unsigned int relation)
+{
+        unsigned int freq_req, freq_reduc, freq_avg;
+        unsigned int freq_hi, freq_lo;
+        unsigned int index = 0;
+        unsigned int jiffies_total, jiffies_hi, jiffies_lo;
+        struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, policy->cpu);
+
+        if (!dbs_info->freq_table) {
+                dbs_info->freq_lo = 0;
+                dbs_info->freq_lo_jiffies = 0;
+                return freq_next;
+        }
+
+        cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next,
+                        relation, &index);
+        freq_req = dbs_info->freq_table[index].frequency;
+        freq_reduc = freq_req * dbs_tuners_ins.powersave_bias / 1000;
+        freq_avg = freq_req - freq_reduc;
+
+        /* Find freq bounds for freq_avg in freq_table */
+        index = 0;
+        cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg,
+                        CPUFREQ_RELATION_H, &index);
+        freq_lo = dbs_info->freq_table[index].frequency;
+        index = 0;
+        cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg,
+                        CPUFREQ_RELATION_L, &index);
+        freq_hi = dbs_info->freq_table[index].frequency;
+
+        /* Find out how long we have to be in hi and lo freqs */
+        if (freq_hi == freq_lo) {
+                dbs_info->freq_lo = 0;
+                dbs_info->freq_lo_jiffies = 0;
+                return freq_lo;
+        }
+        jiffies_total = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
+        jiffies_hi = (freq_avg - freq_lo) * jiffies_total;
+        jiffies_hi += ((freq_hi - freq_lo) / 2);
+        jiffies_hi /= (freq_hi - freq_lo);
+        jiffies_lo = jiffies_total - jiffies_hi;
+        dbs_info->freq_lo = freq_lo;
+        dbs_info->freq_lo_jiffies = jiffies_lo;
+        dbs_info->freq_hi_jiffies = jiffies_hi;
+        return freq_hi;
+}
+
+static void ondemand_powersave_bias_init(void)
+{
+        int i;
+        for_each_online_cpu(i) {
+                struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, i);
+                dbs_info->freq_table = cpufreq_frequency_get_table(i);
+                dbs_info->freq_lo = 0;
+        }
+}
+
 /************************** sysfs interface ************************/
 static ssize_t show_sampling_rate_max(struct cpufreq_policy *policy, char *buf)
 {
@@ -124,6 +192,7 @@ static ssize_t show_##file_name						\
 show_one(sampling_rate, sampling_rate);
 show_one(up_threshold, up_threshold);
 show_one(ignore_nice_load, ignore_nice);
+show_one(powersave_bias, powersave_bias);
 
 static ssize_t store_sampling_rate(struct cpufreq_policy *unused,
                 const char *buf, size_t count)
@@ -198,6 +267,27 @@ static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy,
         return count;
 }
 
+static ssize_t store_powersave_bias(struct cpufreq_policy *unused,
+                const char *buf, size_t count)
+{
+        unsigned int input;
+        int ret;
+        ret = sscanf(buf, "%u", &input);
+
+        if (ret != 1)
+                return -EINVAL;
+
+        if (input > 1000)
+                input = 1000;
+
+        mutex_lock(&dbs_mutex);
+        dbs_tuners_ins.powersave_bias = input;
+        ondemand_powersave_bias_init();
+        mutex_unlock(&dbs_mutex);
+
+        return count;
+}
+
 #define define_one_rw(_name) \
 static struct freq_attr _name = \
 __ATTR(_name, 0644, show_##_name, store_##_name)
@@ -205,6 +295,7 @@ __ATTR(_name, 0644, show_##_name, store_##_name)
 define_one_rw(sampling_rate);
 define_one_rw(up_threshold);
 define_one_rw(ignore_nice_load);
+define_one_rw(powersave_bias);
 
 static struct attribute * dbs_attributes[] = {
         &sampling_rate_max.attr,
@@ -212,6 +303,7 @@ static struct attribute * dbs_attributes[] = {
         &sampling_rate.attr,
         &up_threshold.attr,
         &ignore_nice_load.attr,
+        &powersave_bias.attr,
         NULL
 };
 
@@ -234,6 +326,7 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
         if (!this_dbs_info->enable)
                 return;
 
+        this_dbs_info->freq_lo = 0;
         policy = this_dbs_info->cur_policy;
         cur_jiffies = jiffies64_to_cputime64(get_jiffies_64());
         total_ticks = (unsigned int) cputime64_sub(cur_jiffies,
@@ -274,11 +367,18 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
         /* Check for frequency increase */
         if (load > dbs_tuners_ins.up_threshold) {
                 /* if we are already at full speed then break out early */
-                if (policy->cur == policy->max)
-                        return;
-
-                __cpufreq_driver_target(policy, policy->max,
-                        CPUFREQ_RELATION_H);
+                if (!dbs_tuners_ins.powersave_bias) {
+                        if (policy->cur == policy->max)
+                                return;
+
+                        __cpufreq_driver_target(policy, policy->max,
+                                CPUFREQ_RELATION_H);
+                } else {
+                        int freq = powersave_bias_target(policy, policy->max,
+                                        CPUFREQ_RELATION_H);
+                        __cpufreq_driver_target(policy, freq,
+                                CPUFREQ_RELATION_L);
+                }
                 return;
         }
 
@@ -293,37 +393,64 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
          * policy. To be safe, we focus 10 points under the threshold.
          */
         if (load < (dbs_tuners_ins.up_threshold - 10)) {
-                unsigned int freq_next;
-                freq_next = (policy->cur * load) /
+                unsigned int freq_next = (policy->cur * load) /
                         (dbs_tuners_ins.up_threshold - 10);
-
-                __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_L);
+                if (!dbs_tuners_ins.powersave_bias) {
+                        __cpufreq_driver_target(policy, freq_next,
+                                        CPUFREQ_RELATION_L);
+                } else {
+                        int freq = powersave_bias_target(policy, freq_next,
+                                        CPUFREQ_RELATION_L);
+                        __cpufreq_driver_target(policy, freq,
+                                CPUFREQ_RELATION_L);
+                }
         }
 }
 
+/* Sampling types */
+enum {DBS_NORMAL_SAMPLE, DBS_SUB_SAMPLE};
+
 static void do_dbs_timer(void *data)
 {
         unsigned int cpu = smp_processor_id();
         struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, cpu);
+        /* We want all CPUs to do sampling nearly on same jiffy */
+        int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
+        delay -= jiffies % delay;
 
         if (!dbs_info->enable)
                 return;
-
-        lock_cpu_hotplug();
-        dbs_check_cpu(dbs_info);
-        unlock_cpu_hotplug();
-        queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work,
-                        usecs_to_jiffies(dbs_tuners_ins.sampling_rate));
+        /* Common NORMAL_SAMPLE setup */
+        INIT_WORK(&dbs_info->work, do_dbs_timer, (void *)DBS_NORMAL_SAMPLE);
+        if (!dbs_tuners_ins.powersave_bias ||
+            (unsigned long) data == DBS_NORMAL_SAMPLE) {
+                lock_cpu_hotplug();
+                dbs_check_cpu(dbs_info);
+                unlock_cpu_hotplug();
+                if (dbs_info->freq_lo) {
+                        /* Setup timer for SUB_SAMPLE */
+                        INIT_WORK(&dbs_info->work, do_dbs_timer,
+                                        (void *)DBS_SUB_SAMPLE);
+                        delay = dbs_info->freq_hi_jiffies;
+                }
+        } else {
+                __cpufreq_driver_target(dbs_info->cur_policy,
+                                        dbs_info->freq_lo,
+                                        CPUFREQ_RELATION_H);
+        }
+        queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, delay);
 }
 
 static inline void dbs_timer_init(unsigned int cpu)
 {
         struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, cpu);
+        /* We want all CPUs to do sampling nearly on same jiffy */
+        int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
+        delay -= jiffies % delay;
 
-        INIT_WORK(&dbs_info->work, do_dbs_timer, 0);
-        queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work,
-                        usecs_to_jiffies(dbs_tuners_ins.sampling_rate));
-        return;
+        ondemand_powersave_bias_init();
+        INIT_WORK(&dbs_info->work, do_dbs_timer, NULL);
+        queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, delay);
 }
 
 static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info)
diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index 25eee5394201..c2ecc599dc5f 100644
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -350,12 +350,10 @@ __init cpufreq_stats_init(void)
         }
 
         register_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
-        lock_cpu_hotplug();
         for_each_online_cpu(cpu) {
                 cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier, CPU_ONLINE,
                         (void *)(long)cpu);
         }
-        unlock_cpu_hotplug();
         return 0;
 }
 static void