Merge branch 'pm-cpufreq'

* pm-cpufreq:
  cpufreq: move policy kobj to update_policy_cpu()
  cpufreq: propagate error returned by kobject_move()
  cpufreq: don't restore policy->cpus on failure to move kobj
  powernow-k6: support 350MHz CPU
  cpufreq: ondemand: Eliminate the deadband effect
  cpufreq: Introduce new relation for freq selection
  cpufreq: imx6: remove pu regulator dependency for SOCs with no PU regulator
  cpufreq: intel_pstate: Remove core_pct rounding
  cpufreq: intel_pstate: Simplify P state adjustment logic.
  cpufreq: intel_pstate: Keep values in aperf/mperf in full precision
  cpufreq: intel_pstate: Disable interrupts during MSRs reading
  cpufreq: intel_pstate: Align multiple lines to open parenthesis
  cpufreq: intel_pstate: Remove unnecessary intermediate variable sample_time
  cpufreq: intel_pstate: Cleanup parentheses
  cpufreq: intel_pstate: Fit code in a single line where possible
  cpufreq: intel_pstate: Add missing blank lines after declarations
  cpufreq: intel_pstate: Remove unnecessary type casting in div_s64() call
  cpufreq: intel_pstate: Make intel_pstate_kobject and debugfs_parent locals

drivers/cpufreq/cpufreq.c

@@ -1076,10 +1076,20 @@ static void cpufreq_policy_free(struct cpufreq_policy *policy)
 	kfree(policy);
 }
 
-static void update_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu)
+static int update_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu,
+			     struct device *cpu_dev)
 {
+	int ret;
+
 	if (WARN_ON(cpu == policy->cpu))
-		return;
+		return 0;
+
+	/* Move kobject to the new policy->cpu */
+	ret = kobject_move(&policy->kobj, &cpu_dev->kobj);
+	if (ret) {
+		pr_err("%s: Failed to move kobj: %d\n", __func__, ret);
+		return ret;
+	}
 
 	down_write(&policy->rwsem);
 
@@ -1090,6 +1100,8 @@ static void update_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu)
 
 	blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
 			CPUFREQ_UPDATE_POLICY_CPU, policy);
+
+	return 0;
 }
 
 static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
@@ -1153,12 +1165,10 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
 	 * the creation of a brand new one. So we need to perform this update
 	 * by invoking update_policy_cpu().
 	 */
-	if (recover_policy && cpu != policy->cpu) {
-		update_policy_cpu(policy, cpu);
-		WARN_ON(kobject_move(&policy->kobj, &dev->kobj));
-	} else {
+	if (recover_policy && cpu != policy->cpu)
+		WARN_ON(update_policy_cpu(policy, cpu, dev));
+	else
 		policy->cpu = cpu;
-	}
 
 	cpumask_copy(policy->cpus, cpumask_of(cpu));
 
@@ -1309,38 +1319,11 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
 	return __cpufreq_add_dev(dev, sif);
 }
 
-static int cpufreq_nominate_new_policy_cpu(struct cpufreq_policy *policy,
-					   unsigned int old_cpu)
-{
-	struct device *cpu_dev;
-	int ret;
-
-	/* first sibling now owns the new sysfs dir */
-	cpu_dev = get_cpu_device(cpumask_any_but(policy->cpus, old_cpu));
-
-	sysfs_remove_link(&cpu_dev->kobj, "cpufreq");
-	ret = kobject_move(&policy->kobj, &cpu_dev->kobj);
-	if (ret) {
-		pr_err("%s: Failed to move kobj: %d\n", __func__, ret);
-
-		down_write(&policy->rwsem);
-		cpumask_set_cpu(old_cpu, policy->cpus);
-		up_write(&policy->rwsem);
-
-		ret = sysfs_create_link(&cpu_dev->kobj, &policy->kobj,
-					"cpufreq");
-
-		return -EINVAL;
-	}
-
-	return cpu_dev->id;
-}
-
 static int __cpufreq_remove_dev_prepare(struct device *dev,
 					struct subsys_interface *sif)
 {
 	unsigned int cpu = dev->id, cpus;
-	int new_cpu, ret;
+	int ret;
 	unsigned long flags;
 	struct cpufreq_policy *policy;
 
@@ -1380,14 +1363,23 @@ static int __cpufreq_remove_dev_prepare(struct device *dev,
 	if (cpu != policy->cpu) {
 		sysfs_remove_link(&dev->kobj, "cpufreq");
 	} else if (cpus > 1) {
-		new_cpu = cpufreq_nominate_new_policy_cpu(policy, cpu);
-		if (new_cpu >= 0) {
-			update_policy_cpu(policy, new_cpu);
+		/* Nominate new CPU */
+		int new_cpu = cpumask_any_but(policy->cpus, cpu);
+		struct device *cpu_dev = get_cpu_device(new_cpu);
 
-			if (!cpufreq_suspended)
-				pr_debug("%s: policy Kobject moved to cpu: %d from: %d\n",
-					 __func__, new_cpu, cpu);
+		sysfs_remove_link(&cpu_dev->kobj, "cpufreq");
+		ret = update_policy_cpu(policy, new_cpu, cpu_dev);
+		if (ret) {
+			if (sysfs_create_link(&cpu_dev->kobj, &policy->kobj,
+					      "cpufreq"))
+				pr_err("%s: Failed to restore kobj link to cpu:%d\n",
+				       __func__, cpu_dev->id);
+			return ret;
 		}
+
+		if (!cpufreq_suspended)
+			pr_debug("%s: policy Kobject moved to cpu: %d from: %d\n",
+				 __func__, new_cpu, cpu);
 	} else if (cpufreq_driver->stop_cpu && cpufreq_driver->setpolicy) {
 		cpufreq_driver->stop_cpu(policy);
 	}

drivers/cpufreq/cpufreq_ondemand.c

@@ -170,21 +170,24 @@ static void od_check_cpu(int cpu, unsigned int load)
 		dbs_freq_increase(policy, policy->max);
 	} else {
 		/* Calculate the next frequency proportional to load */
-		unsigned int freq_next;
-		freq_next = load * policy->cpuinfo.max_freq / 100;
+		unsigned int freq_next, min_f, max_f;
+
+		min_f = policy->cpuinfo.min_freq;
+		max_f = policy->cpuinfo.max_freq;
+		freq_next = min_f + load * (max_f - min_f) / 100;
 
 		/* No longer fully busy, reset rate_mult */
 		dbs_info->rate_mult = 1;
 
 		if (!od_tuners->powersave_bias) {
 			__cpufreq_driver_target(policy, freq_next,
-					CPUFREQ_RELATION_L);
+					CPUFREQ_RELATION_C);
 			return;
 		}
 
 		freq_next = od_ops.powersave_bias_target(policy, freq_next,
 					CPUFREQ_RELATION_L);
-		__cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_L);
+		__cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_C);
 	}
 }
 

drivers/cpufreq/freq_table.c

@@ -117,7 +117,7 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 		.frequency = 0,
 	};
 	struct cpufreq_frequency_table *pos;
-	unsigned int freq, i = 0;
+	unsigned int freq, diff, i = 0;
 
 	pr_debug("request for target %u kHz (relation: %u) for cpu %u\n",
 					target_freq, relation, policy->cpu);
@@ -127,6 +127,7 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 		suboptimal.frequency = ~0;
 		break;
 	case CPUFREQ_RELATION_L:
+	case CPUFREQ_RELATION_C:
 		optimal.frequency = ~0;
 		break;
 	}
@@ -168,6 +169,15 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy,
 				}
 			}
 			break;
+		case CPUFREQ_RELATION_C:
+			diff = abs(freq - target_freq);
+			if (diff < optimal.frequency ||
+			    (diff == optimal.frequency &&
+			     freq > table[optimal.driver_data].frequency)) {
+				optimal.frequency = diff;
+				optimal.driver_data = i;
+			}
+			break;
 		}
 	}
 	if (optimal.driver_data > i) {

drivers/cpufreq/imx6q-cpufreq.c

@@ -66,10 +66,12 @@ static int imx6q_set_target(struct cpufreq_policy *policy, unsigned int index)
 
 	/* scaling up?  scale voltage before frequency */
 	if (new_freq > old_freq) {
-		ret = regulator_set_voltage_tol(pu_reg, imx6_soc_volt[index], 0);
-		if (ret) {
-			dev_err(cpu_dev, "failed to scale vddpu up: %d\n", ret);
-			return ret;
+		if (!IS_ERR(pu_reg)) {
+			ret = regulator_set_voltage_tol(pu_reg, imx6_soc_volt[index], 0);
+			if (ret) {
+				dev_err(cpu_dev, "failed to scale vddpu up: %d\n", ret);
+				return ret;
+			}
 		}
 		ret = regulator_set_voltage_tol(soc_reg, imx6_soc_volt[index], 0);
 		if (ret) {
@@ -121,10 +123,12 @@ static int imx6q_set_target(struct cpufreq_policy *policy, unsigned int index)
 			dev_warn(cpu_dev, "failed to scale vddsoc down: %d\n", ret);
 			ret = 0;
 		}
-		ret = regulator_set_voltage_tol(pu_reg, imx6_soc_volt[index], 0);
-		if (ret) {
-			dev_warn(cpu_dev, "failed to scale vddpu down: %d\n", ret);
-			ret = 0;
+		if (!IS_ERR(pu_reg)) {
+			ret = regulator_set_voltage_tol(pu_reg, imx6_soc_volt[index], 0);
+			if (ret) {
+				dev_warn(cpu_dev, "failed to scale vddpu down: %d\n", ret);
+				ret = 0;
+			}
 		}
 	}
 
@@ -182,9 +186,9 @@ static int imx6q_cpufreq_probe(struct platform_device *pdev)
 	}
 
 	arm_reg = regulator_get(cpu_dev, "arm");
-	pu_reg = regulator_get(cpu_dev, "pu");
+	pu_reg = regulator_get_optional(cpu_dev, "pu");
 	soc_reg = regulator_get(cpu_dev, "soc");
-	if (IS_ERR(arm_reg) || IS_ERR(pu_reg) || IS_ERR(soc_reg)) {
+	if (IS_ERR(arm_reg) || IS_ERR(soc_reg)) {
 		dev_err(cpu_dev, "failed to get regulators\n");
 		ret = -ENOENT;
 		goto put_reg;
@@ -268,9 +272,11 @@ soc_opp_out:
 	ret = regulator_set_voltage_time(soc_reg, imx6_soc_volt[0], imx6_soc_volt[num - 1]);
 	if (ret > 0)
 		transition_latency += ret * 1000;
-	ret = regulator_set_voltage_time(pu_reg, imx6_soc_volt[0], imx6_soc_volt[num - 1]);
-	if (ret > 0)
-		transition_latency += ret * 1000;
+	if (!IS_ERR(pu_reg)) {
+		ret = regulator_set_voltage_time(pu_reg, imx6_soc_volt[0], imx6_soc_volt[num - 1]);
+		if (ret > 0)
+			transition_latency += ret * 1000;
+	}
 
 	/*
 	 * OPP is maintained in order of increasing frequency, and
@@ -327,7 +333,8 @@ static int imx6q_cpufreq_remove(struct platform_device *pdev)
 	cpufreq_unregister_driver(&imx6q_cpufreq_driver);
 	dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
 	regulator_put(arm_reg);
-	regulator_put(pu_reg);
+	if (!IS_ERR(pu_reg))
+		regulator_put(pu_reg);
 	regulator_put(soc_reg);
 	clk_put(arm_clk);
 	clk_put(pll1_sys_clk);

drivers/cpufreq/intel_pstate.c

@@ -37,7 +37,6 @@
 #define BYT_TURBO_RATIOS	0x66c
 #define BYT_TURBO_VIDS		0x66d
 
-
 #define FRAC_BITS 8
 #define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
 #define fp_toint(X) ((X) >> FRAC_BITS)
@@ -50,7 +49,7 @@ static inline int32_t mul_fp(int32_t x, int32_t y)
 
 static inline int32_t div_fp(int32_t x, int32_t y)
 {
-	return div_s64((int64_t)x << FRAC_BITS, (int64_t)y);
+	return div_s64((int64_t)x << FRAC_BITS, y);
 }
 
 struct sample {
@@ -148,7 +147,7 @@ static struct perf_limits limits = {
 };
 
 static inline void pid_reset(struct _pid *pid, int setpoint, int busy,
-			int deadband, int integral) {
+			     int deadband, int integral) {
 	pid->setpoint = setpoint;
 	pid->deadband  = deadband;
 	pid->integral  = int_tofp(integral);
@@ -167,7 +166,6 @@ static inline void pid_i_gain_set(struct _pid *pid, int percent)
 
 static inline void pid_d_gain_set(struct _pid *pid, int percent)
 {
-
 	pid->d_gain = div_fp(int_tofp(percent), int_tofp(100));
 }
 
@@ -207,16 +205,13 @@ static inline void intel_pstate_busy_pid_reset(struct cpudata *cpu)
 	pid_d_gain_set(&cpu->pid, pid_params.d_gain_pct);
 	pid_i_gain_set(&cpu->pid, pid_params.i_gain_pct);
 
-	pid_reset(&cpu->pid,
-		pid_params.setpoint,
-		100,
-		pid_params.deadband,
-		0);
+	pid_reset(&cpu->pid, pid_params.setpoint, 100, pid_params.deadband, 0);
 }
 
 static inline void intel_pstate_reset_all_pid(void)
 {
 	unsigned int cpu;
+
 	for_each_online_cpu(cpu) {
 		if (all_cpu_data[cpu])
 			intel_pstate_busy_pid_reset(all_cpu_data[cpu]);
@@ -230,13 +225,13 @@ static int pid_param_set(void *data, u64 val)
 	intel_pstate_reset_all_pid();
 	return 0;
 }
+
 static int pid_param_get(void *data, u64 *val)
 {
 	*val = *(u32 *)data;
 	return 0;
 }
-DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param, pid_param_get,
-			pid_param_set, "%llu\n");
+DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param, pid_param_get, pid_param_set, "%llu\n");
 
 struct pid_param {
 	char *name;
@@ -253,9 +248,9 @@ static struct pid_param pid_files[] = {
 	{NULL, NULL}
 };
 
-static struct dentry *debugfs_parent;
-static void intel_pstate_debug_expose_params(void)
+static void __init intel_pstate_debug_expose_params(void)
 {
+	struct dentry *debugfs_parent;
 	int i = 0;
 
 	debugfs_parent = debugfs_create_dir("pstate_snb", NULL);
@@ -263,8 +258,8 @@ static void intel_pstate_debug_expose_params(void)
 		return;
 	while (pid_files[i].name) {
 		debugfs_create_file(pid_files[i].name, 0660,
-				debugfs_parent, pid_files[i].value,
-				&fops_pid_param);
+				    debugfs_parent, pid_files[i].value,
+				    &fops_pid_param);
 		i++;
 	}
 }
@@ -280,10 +275,11 @@ static void intel_pstate_debug_expose_params(void)
 	}
 
 static ssize_t store_no_turbo(struct kobject *a, struct attribute *b,
-				const char *buf, size_t count)
+			      const char *buf, size_t count)
 {
 	unsigned int input;
 	int ret;
+
 	ret = sscanf(buf, "%u", &input);
 	if (ret != 1)
 		return -EINVAL;
@@ -296,10 +292,11 @@ static ssize_t store_no_turbo(struct kobject *a, struct attribute *b,
 }
 
 static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b,
-				const char *buf, size_t count)
+				  const char *buf, size_t count)
 {
 	unsigned int input;
 	int ret;
+
 	ret = sscanf(buf, "%u", &input);
 	if (ret != 1)
 		return -EINVAL;
@@ -307,14 +304,16 @@ static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b,
 	limits.max_sysfs_pct = clamp_t(int, input, 0 , 100);
 	limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct);
 	limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
+
 	return count;
 }
 
 static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b,
-				const char *buf, size_t count)
+				  const char *buf, size_t count)
 {
 	unsigned int input;
 	int ret;
+
 	ret = sscanf(buf, "%u", &input);
 	if (ret != 1)
 		return -EINVAL;
@@ -342,17 +341,16 @@ static struct attribute *intel_pstate_attributes[] = {
 static struct attribute_group intel_pstate_attr_group = {
 	.attrs = intel_pstate_attributes,
 };
-static struct kobject *intel_pstate_kobject;
 
-static void intel_pstate_sysfs_expose_params(void)
+static void __init intel_pstate_sysfs_expose_params(void)
 {
+	struct kobject *intel_pstate_kobject;
 	int rc;
 
 	intel_pstate_kobject = kobject_create_and_add("intel_pstate",
 						&cpu_subsys.dev_root->kobj);
 	BUG_ON(!intel_pstate_kobject);
-	rc = sysfs_create_group(intel_pstate_kobject,
-				&intel_pstate_attr_group);
+	rc = sysfs_create_group(intel_pstate_kobject, &intel_pstate_attr_group);
 	BUG_ON(rc);
 }
 
@@ -360,6 +358,7 @@ static void intel_pstate_sysfs_expose_params(void)
 static int byt_get_min_pstate(void)
 {
 	u64 value;
+
 	rdmsrl(BYT_RATIOS, value);
 	return (value >> 8) & 0x7F;
 }
@@ -367,6 +366,7 @@ static int byt_get_min_pstate(void)
 static int byt_get_max_pstate(void)
 {
 	u64 value;
+
 	rdmsrl(BYT_RATIOS, value);
 	return (value >> 16) & 0x7F;
 }
@@ -374,6 +374,7 @@ static int byt_get_max_pstate(void)
 static int byt_get_turbo_pstate(void)
 {
 	u64 value;
+
 	rdmsrl(BYT_TURBO_RATIOS, value);
 	return value & 0x7F;
 }
@@ -407,7 +408,6 @@ static void byt_get_vid(struct cpudata *cpudata)
 {
 	u64 value;
 
-
 	rdmsrl(BYT_VIDS, value);
 	cpudata->vid.min = int_tofp((value >> 8) & 0x7f);
 	cpudata->vid.max = int_tofp((value >> 16) & 0x7f);
@@ -420,10 +420,10 @@ static void byt_get_vid(struct cpudata *cpudata)
 	cpudata->vid.turbo = value & 0x7f;
 }
 
-
 static int core_get_min_pstate(void)
 {
 	u64 value;
+
 	rdmsrl(MSR_PLATFORM_INFO, value);
 	return (value >> 40) & 0xFF;
 }
@@ -431,6 +431,7 @@ static int core_get_min_pstate(void)
 static int core_get_max_pstate(void)
 {
 	u64 value;
+
 	rdmsrl(MSR_PLATFORM_INFO, value);
 	return (value >> 8) & 0xFF;
 }
@@ -439,9 +440,10 @@ static int core_get_turbo_pstate(void)
 {
 	u64 value;
 	int nont, ret;
+
 	rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value);
 	nont = core_get_max_pstate();
-	ret = ((value) & 255);
+	ret = (value) & 255;
 	if (ret <= nont)
 		ret = nont;
 	return ret;
@@ -493,12 +495,12 @@ static struct cpu_defaults byt_params = {
 	},
 };
 
-
 static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
 {
 	int max_perf = cpu->pstate.turbo_pstate;
 	int max_perf_adj;
 	int min_perf;
+
 	if (limits.no_turbo)
 		max_perf = cpu->pstate.max_pstate;
 
@@ -507,8 +509,7 @@ static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
 			cpu->pstate.min_pstate, cpu->pstate.turbo_pstate);
 
 	min_perf = fp_toint(mul_fp(int_tofp(max_perf), limits.min_perf));
-	*min = clamp_t(int, min_perf,
-			cpu->pstate.min_pstate, max_perf);
+	*min = clamp_t(int, min_perf, cpu->pstate.min_pstate, max_perf);
 }
 
 static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
@@ -529,21 +530,6 @@ static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
 	pstate_funcs.set(cpu, pstate);
 }
 
-static inline void intel_pstate_pstate_increase(struct cpudata *cpu, int steps)
-{
-	int target;
-	target = cpu->pstate.current_pstate + steps;
-
-	intel_pstate_set_pstate(cpu, target);
-}
-
-static inline void intel_pstate_pstate_decrease(struct cpudata *cpu, int steps)
-{
-	int target;
-	target = cpu->pstate.current_pstate - steps;
-	intel_pstate_set_pstate(cpu, target);
-}
-
 static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
 {
 	cpu->pstate.min_pstate = pstate_funcs.get_min();
@@ -559,13 +545,9 @@ static inline void intel_pstate_calc_busy(struct cpudata *cpu)
 {
 	struct sample *sample = &cpu->sample;
 	int64_t core_pct;
-	int32_t rem;
 
 	core_pct = int_tofp(sample->aperf) * int_tofp(100);
-	core_pct = div_u64_rem(core_pct, int_tofp(sample->mperf), &rem);
-
-	if ((rem << 1) >= int_tofp(sample->mperf))
-		core_pct += 1;
+	core_pct = div64_u64(core_pct, int_tofp(sample->mperf));
 
 	sample->freq = fp_toint(
 		mul_fp(int_tofp(cpu->pstate.max_pstate * 1000), core_pct));
@@ -576,12 +558,12 @@ static inline void intel_pstate_calc_busy(struct cpudata *cpu)
 static inline void intel_pstate_sample(struct cpudata *cpu)
 {
 	u64 aperf, mperf;
+	unsigned long flags;
 
+	local_irq_save(flags);
 	rdmsrl(MSR_IA32_APERF, aperf);
 	rdmsrl(MSR_IA32_MPERF, mperf);
-
-	aperf = aperf >> FRAC_BITS;
-	mperf = mperf >> FRAC_BITS;
+	local_irq_restore(flags);
 
 	cpu->last_sample_time = cpu->sample.time;
 	cpu->sample.time = ktime_get();
@@ -598,10 +580,9 @@ static inline void intel_pstate_sample(struct cpudata *cpu)
 
 static inline void intel_pstate_set_sample_time(struct cpudata *cpu)
 {
-	int sample_time, delay;
+	int delay;
 
-	sample_time = pid_params.sample_rate_ms;
-	delay = msecs_to_jiffies(sample_time);
+	delay = msecs_to_jiffies(pid_params.sample_rate_ms);
 	mod_timer_pinned(&cpu->timer, jiffies + delay);
 }
 
@@ -616,12 +597,12 @@ static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu)
 	current_pstate = int_tofp(cpu->pstate.current_pstate);
 	core_busy = mul_fp(core_busy, div_fp(max_pstate, current_pstate));
 
-	sample_time = (pid_params.sample_rate_ms  * USEC_PER_MSEC);
+	sample_time = pid_params.sample_rate_ms  * USEC_PER_MSEC;
 	duration_us = (u32) ktime_us_delta(cpu->sample.time,
-					cpu->last_sample_time);
+					   cpu->last_sample_time);
 	if (duration_us > sample_time * 3) {
 		sample_ratio = div_fp(int_tofp(sample_time),
-				int_tofp(duration_us));
+				      int_tofp(duration_us));
 		core_busy = mul_fp(core_busy, sample_ratio);
 	}
 
@@ -632,20 +613,15 @@ static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu)
 {
 	int32_t busy_scaled;
 	struct _pid *pid;
-	signed int ctl = 0;
-	int steps;
+	signed int ctl;
 
 	pid = &cpu->pid;
 	busy_scaled = intel_pstate_get_scaled_busy(cpu);
 
 	ctl = pid_calc(pid, busy_scaled);
 
-	steps = abs(ctl);
-
-	if (ctl < 0)
-		intel_pstate_pstate_increase(cpu, steps);
-	else
-		intel_pstate_pstate_decrease(cpu, steps);
+	/* Negative values of ctl increase the pstate and vice versa */
+	intel_pstate_set_pstate(cpu, cpu->pstate.current_pstate - ctl);
 }
 
 static void intel_pstate_timer_func(unsigned long __data)
@@ -705,8 +681,7 @@ static int intel_pstate_init_cpu(unsigned int cpunum)
 
 	init_timer_deferrable(&cpu->timer);
 	cpu->timer.function = intel_pstate_timer_func;
-	cpu->timer.data =
-		(unsigned long)cpu;
+	cpu->timer.data = (unsigned long)cpu;
 	cpu->timer.expires = jiffies + HZ/100;
 	intel_pstate_busy_pid_reset(cpu);
 	intel_pstate_sample(cpu);
@@ -751,7 +726,7 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy)
 	limits.min_perf_pct = clamp_t(int, limits.min_perf_pct, 0 , 100);
 	limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
 
-	limits.max_policy_pct = policy->max * 100 / policy->cpuinfo.max_freq;
+	limits.max_policy_pct = (policy->max * 100) / policy->cpuinfo.max_freq;
 	limits.max_policy_pct = clamp_t(int, limits.max_policy_pct, 0 , 100);
 	limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct);
 	limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
@@ -763,8 +738,8 @@ static int intel_pstate_verify_policy(struct cpufreq_policy *policy)
 {
 	cpufreq_verify_within_cpu_limits(policy);
 
-	if ((policy->policy != CPUFREQ_POLICY_POWERSAVE) &&
-		(policy->policy != CPUFREQ_POLICY_PERFORMANCE))
+	if (policy->policy != CPUFREQ_POLICY_POWERSAVE &&
+	    policy->policy != CPUFREQ_POLICY_PERFORMANCE)
 		return -EINVAL;
 
 	return 0;
@@ -797,7 +772,7 @@ static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
 
 	rdmsrl(MSR_IA32_MISC_ENABLE, misc_en);
 	if (misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE ||
-		cpu->pstate.max_pstate == cpu->pstate.turbo_pstate) {
+	    cpu->pstate.max_pstate == cpu->pstate.turbo_pstate) {
 		limits.turbo_disabled = 1;
 		limits.no_turbo = 1;
 	}
@@ -839,8 +814,8 @@ static int intel_pstate_msrs_not_valid(void)
 	rdmsrl(MSR_IA32_MPERF, mperf);
 
 	if (!pstate_funcs.get_max() ||
-		!pstate_funcs.get_min() ||
-		!pstate_funcs.get_turbo())
+	    !pstate_funcs.get_min() ||
+	    !pstate_funcs.get_turbo())
 		return -ENODEV;
 
 	rdmsrl(MSR_IA32_APERF, tmp);
@@ -922,14 +897,14 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void)
 	struct acpi_table_header hdr;
 	struct hw_vendor_info *v_info;
 
-	if (acpi_disabled
-	    || ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr)))
+	if (acpi_disabled ||
+	    ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr)))
 		return false;
 
 	for (v_info = vendor_info; v_info->valid; v_info++) {
-		if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE)
-		    && !strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE)
-		    && intel_pstate_no_acpi_pss())
+		if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) &&
+		    !strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&
+		    intel_pstate_no_acpi_pss())
 			return true;
 	}
 

drivers/cpufreq/powernow-k6.c

@@ -55,6 +55,7 @@ static const struct {
 	unsigned freq;
 	unsigned mult;
 } usual_frequency_table[] = {
+	{ 350000, 35 },	// 100   * 3.5
 	{ 400000, 40 },	// 100   * 4
 	{ 450000, 45 }, // 100   * 4.5
 	{ 475000, 50 }, //  95   * 5

include/linux/cpufreq.h

@@ -176,6 +176,7 @@ static inline void disable_cpufreq(void) { }
 
 #define CPUFREQ_RELATION_L 0  /* lowest frequency at or above target */
 #define CPUFREQ_RELATION_H 1  /* highest frequency below or at target */
+#define CPUFREQ_RELATION_C 2  /* closest frequency to target */
 
 struct freq_attr {
 	struct attribute attr;