Merge branch 'pm-cpufreq' (e1f1320f) · Commits · 戴 / test

drivers/cpufreq/Kconfig.arm

+1 −1

Original line number	Diff line number	Diff line
		@@ -94,7 +94,7 @@ config ARM_IMX6Q_CPUFREQ
		tristate "Freescale i.MX6 cpufreq support"
		depends on ARCH_MXC
		depends on REGULATOR_ANATOP
		select NVMEM_IMX_OCOTP
		depends on NVMEM_IMX_OCOTP \|\| COMPILE_TEST
		select PM_OPP
		help
		This adds cpufreq driver support for Freescale i.MX6 series SoCs.

drivers/cpufreq/armada-8k-cpufreq.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -204,6 +204,12 @@ static void __exit armada_8k_cpufreq_exit(void)
		}
		module_exit(armada_8k_cpufreq_exit);

		static const struct of_device_id __maybe_unused armada_8k_cpufreq_of_match[] = {
		{ .compatible = "marvell,ap806-cpu-clock" },
		{ },
		};
		MODULE_DEVICE_TABLE(of, armada_8k_cpufreq_of_match);

		MODULE_AUTHOR("Gregory Clement <gregory.clement@bootlin.com>");
		MODULE_DESCRIPTION("Armada 8K cpufreq driver");
		MODULE_LICENSE("GPL");

drivers/cpufreq/cppc_cpufreq.c

+82 −81

Original line number	Diff line number	Diff line
		@@ -26,7 +26,7 @@
		/* Minimum struct length needed for the DMI processor entry we want */
		#define DMI_ENTRY_PROCESSOR_MIN_LENGTH 48

		/* Offest in the DMI processor structure for the max frequency */
		/* Offset in the DMI processor structure for the max frequency */
		#define DMI_PROCESSOR_MAX_SPEED 0x14

		/*
		@@ -96,11 +96,11 @@ static u64 cppc_get_dmi_max_khz(void)
		* and extrapolate the rest
		* For perf/freq > Nominal, we use the ratio perf:freq at Nominal for conversion
		*/
		static unsigned int cppc_cpufreq_perf_to_khz(struct cppc_cpudata *cpu,
		static unsigned int cppc_cpufreq_perf_to_khz(struct cppc_cpudata *cpu_data,
		unsigned int perf)
		{
		struct cppc_perf_caps *caps = &cpu_data->perf_caps;
		static u64 max_khz;
		struct cppc_perf_caps *caps = &cpu->perf_caps;
		u64 mul, div;

		if (caps->lowest_freq && caps->nominal_freq) {
		@@ -120,11 +120,11 @@ static unsigned int cppc_cpufreq_perf_to_khz(struct cppc_cpudata *cpu,
		return (u64)perf * mul / div;
		}

		static unsigned int cppc_cpufreq_khz_to_perf(struct cppc_cpudata *cpu,
		static unsigned int cppc_cpufreq_khz_to_perf(struct cppc_cpudata *cpu_data,
		unsigned int freq)
		{
		struct cppc_perf_caps *caps = &cpu_data->perf_caps;
		static u64 max_khz;
		struct cppc_perf_caps *caps = &cpu->perf_caps;
		u64 mul, div;

		if (caps->lowest_freq && caps->nominal_freq) {
		@@ -149,29 +149,27 @@ static int cppc_cpufreq_set_target(struct cpufreq_policy *policy,
		unsigned int target_freq,
		unsigned int relation)
		{
		struct cppc_cpudata *cpu;
		struct cppc_cpudata *cpu_data = all_cpu_data[policy->cpu];
		struct cpufreq_freqs freqs;
		u32 desired_perf;
		int ret = 0;

		cpu = all_cpu_data[policy->cpu];

		desired_perf = cppc_cpufreq_khz_to_perf(cpu, target_freq);
		desired_perf = cppc_cpufreq_khz_to_perf(cpu_data, target_freq);
		/* Return if it is exactly the same perf */
		if (desired_perf == cpu->perf_ctrls.desired_perf)
		if (desired_perf == cpu_data->perf_ctrls.desired_perf)
		return ret;

		cpu->perf_ctrls.desired_perf = desired_perf;
		cpu_data->perf_ctrls.desired_perf = desired_perf;
		freqs.old = policy->cur;
		freqs.new = target_freq;

		cpufreq_freq_transition_begin(policy, &freqs);
		ret = cppc_set_perf(cpu->cpu, &cpu->perf_ctrls);
		ret = cppc_set_perf(cpu_data->cpu, &cpu_data->perf_ctrls);
		cpufreq_freq_transition_end(policy, &freqs, ret != 0);

		if (ret)
		pr_debug("Failed to set target on CPU:%d. ret:%d\n",
		cpu->cpu, ret);
		cpu_data->cpu, ret);

		return ret;
		}
		@@ -184,28 +182,29 @@ static int cppc_verify_policy(struct cpufreq_policy_data *policy)

		static void cppc_cpufreq_stop_cpu(struct cpufreq_policy *policy)
		{
		int cpu_num = policy->cpu;
		struct cppc_cpudata *cpu = all_cpu_data[cpu_num];
		struct cppc_cpudata *cpu_data = all_cpu_data[policy->cpu];
		struct cppc_perf_caps *caps = &cpu_data->perf_caps;
		unsigned int cpu = policy->cpu;
		int ret;

		cpu->perf_ctrls.desired_perf = cpu->perf_caps.lowest_perf;
		cpu_data->perf_ctrls.desired_perf = caps->lowest_perf;

		ret = cppc_set_perf(cpu_num, &cpu->perf_ctrls);
		ret = cppc_set_perf(cpu, &cpu_data->perf_ctrls);
		if (ret)
		pr_debug("Err setting perf value:%d on CPU:%d. ret:%d\n",
		cpu->perf_caps.lowest_perf, cpu_num, ret);
		caps->lowest_perf, cpu, ret);
		}

		/*
		* The PCC subspace describes the rate at which platform can accept commands
		* on the shared PCC channel (including READs which do not count towards freq
		* trasition requests), so ideally we need to use the PCC values as a fallback
		* transition requests), so ideally we need to use the PCC values as a fallback
		* if we don't have a platform specific transition_delay_us
		*/
		#ifdef CONFIG_ARM64
		#include <asm/cputype.h>

		static unsigned int cppc_cpufreq_get_transition_delay_us(int cpu)
		static unsigned int cppc_cpufreq_get_transition_delay_us(unsigned int cpu)
		{
		unsigned long implementor = read_cpuid_implementor();
		unsigned long part_num = read_cpuid_part_number();
		@@ -233,7 +232,7 @@ static unsigned int cppc_cpufreq_get_transition_delay_us(int cpu)

		#else

		static unsigned int cppc_cpufreq_get_transition_delay_us(int cpu)
		static unsigned int cppc_cpufreq_get_transition_delay_us(unsigned int cpu)
		{
		return cppc_get_transition_latency(cpu) / NSEC_PER_USEC;
		}
		@@ -241,54 +240,57 @@ static unsigned int cppc_cpufreq_get_transition_delay_us(int cpu)

		static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy)
		{
		struct cppc_cpudata *cpu;
		unsigned int cpu_num = policy->cpu;
		struct cppc_cpudata *cpu_data = all_cpu_data[policy->cpu];
		struct cppc_perf_caps *caps = &cpu_data->perf_caps;
		unsigned int cpu = policy->cpu;
		int ret = 0;

		cpu = all_cpu_data[policy->cpu];

		cpu->cpu = cpu_num;
		ret = cppc_get_perf_caps(policy->cpu, &cpu->perf_caps);
		cpu_data->cpu = cpu;
		ret = cppc_get_perf_caps(cpu, caps);

		if (ret) {
		pr_debug("Err reading CPU%d perf capabilities. ret:%d\n",
		cpu_num, ret);
		cpu, ret);
		return ret;
		}

		/* Convert the lowest and nominal freq from MHz to KHz */
		cpu->perf_caps.lowest_freq *= 1000;
		cpu->perf_caps.nominal_freq *= 1000;
		caps->lowest_freq *= 1000;
		caps->nominal_freq *= 1000;

		/*
		* Set min to lowest nonlinear perf to avoid any efficiency penalty (see
		* Section 8.4.7.1.1.5 of ACPI 6.1 spec)
		*/
		policy->min = cppc_cpufreq_perf_to_khz(cpu, cpu->perf_caps.lowest_nonlinear_perf);
		policy->max = cppc_cpufreq_perf_to_khz(cpu, cpu->perf_caps.nominal_perf);
		policy->min = cppc_cpufreq_perf_to_khz(cpu_data,
		caps->lowest_nonlinear_perf);
		policy->max = cppc_cpufreq_perf_to_khz(cpu_data,
		caps->nominal_perf);

		/*
		* Set cpuinfo.min_freq to Lowest to make the full range of performance
		* available if userspace wants to use any perf between lowest & lowest
		* nonlinear perf
		*/
		policy->cpuinfo.min_freq = cppc_cpufreq_perf_to_khz(cpu, cpu->perf_caps.lowest_perf);
		policy->cpuinfo.max_freq = cppc_cpufreq_perf_to_khz(cpu, cpu->perf_caps.nominal_perf);
		policy->cpuinfo.min_freq = cppc_cpufreq_perf_to_khz(cpu_data,
		caps->lowest_perf);
		policy->cpuinfo.max_freq = cppc_cpufreq_perf_to_khz(cpu_data,
		caps->nominal_perf);

		policy->transition_delay_us = cppc_cpufreq_get_transition_delay_us(cpu_num);
		policy->shared_type = cpu->shared_type;
		policy->transition_delay_us = cppc_cpufreq_get_transition_delay_us(cpu);
		policy->shared_type = cpu_data->shared_type;

		if (policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
		int i;

		cpumask_copy(policy->cpus, cpu->shared_cpu_map);
		cpumask_copy(policy->cpus, cpu_data->shared_cpu_map);

		for_each_cpu(i, policy->cpus) {
		if (unlikely(i == policy->cpu))
		if (unlikely(i == cpu))
		continue;

		memcpy(&all_cpu_data[i]->perf_caps, &cpu->perf_caps,
		sizeof(cpu->perf_caps));
		memcpy(&all_cpu_data[i]->perf_caps, caps,
		sizeof(cpu_data->perf_caps));
		}
		} else if (policy->shared_type == CPUFREQ_SHARED_TYPE_ALL) {
		/* Support only SW_ANY for now. */
		@@ -296,24 +298,23 @@ static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy)
		return -EFAULT;
		}

		cpu->cur_policy = policy;
		cpu_data->cur_policy = policy;

		/*
		* If 'highest_perf' is greater than 'nominal_perf', we assume CPU Boost
		* is supported.
		*/
		if (cpu->perf_caps.highest_perf > cpu->perf_caps.nominal_perf)
		if (caps->highest_perf > caps->nominal_perf)
		boost_supported = true;

		/* Set policy->cur to max now. The governors will adjust later. */
		policy->cur = cppc_cpufreq_perf_to_khz(cpu,
		cpu->perf_caps.highest_perf);
		cpu->perf_ctrls.desired_perf = cpu->perf_caps.highest_perf;
		policy->cur = cppc_cpufreq_perf_to_khz(cpu_data, caps->highest_perf);
		cpu_data->perf_ctrls.desired_perf = caps->highest_perf;

		ret = cppc_set_perf(cpu_num, &cpu->perf_ctrls);
		ret = cppc_set_perf(cpu, &cpu_data->perf_ctrls);
		if (ret)
		pr_debug("Err setting perf value:%d on CPU:%d. ret:%d\n",
		cpu->perf_caps.highest_perf, cpu_num, ret);
		caps->highest_perf, cpu, ret);

		return ret;
		}
		@@ -326,7 +327,7 @@ static inline u64 get_delta(u64 t1, u64 t0)
		return (u32)t1 - (u32)t0;
		}

		static int cppc_get_rate_from_fbctrs(struct cppc_cpudata *cpu,
		static int cppc_get_rate_from_fbctrs(struct cppc_cpudata *cpu_data,
		struct cppc_perf_fb_ctrs fb_ctrs_t0,
		struct cppc_perf_fb_ctrs fb_ctrs_t1)
		{
		@@ -345,33 +346,34 @@ static int cppc_get_rate_from_fbctrs(struct cppc_cpudata *cpu,
		delivered_perf = (reference_perf * delta_delivered) /
		delta_reference;
		else
		delivered_perf = cpu->perf_ctrls.desired_perf;
		delivered_perf = cpu_data->perf_ctrls.desired_perf;

		return cppc_cpufreq_perf_to_khz(cpu, delivered_perf);
		return cppc_cpufreq_perf_to_khz(cpu_data, delivered_perf);
		}

		static unsigned int cppc_cpufreq_get_rate(unsigned int cpunum)
		static unsigned int cppc_cpufreq_get_rate(unsigned int cpu)
		{
		struct cppc_perf_fb_ctrs fb_ctrs_t0 = {0}, fb_ctrs_t1 = {0};
		struct cppc_cpudata *cpu = all_cpu_data[cpunum];
		struct cppc_cpudata *cpu_data = all_cpu_data[cpu];
		int ret;

		ret = cppc_get_perf_ctrs(cpunum, &fb_ctrs_t0);
		ret = cppc_get_perf_ctrs(cpu, &fb_ctrs_t0);
		if (ret)
		return ret;

		udelay(2); /* 2usec delay between sampling */

		ret = cppc_get_perf_ctrs(cpunum, &fb_ctrs_t1);
		ret = cppc_get_perf_ctrs(cpu, &fb_ctrs_t1);
		if (ret)
		return ret;

		return cppc_get_rate_from_fbctrs(cpu, fb_ctrs_t0, fb_ctrs_t1);
		return cppc_get_rate_from_fbctrs(cpu_data, fb_ctrs_t0, fb_ctrs_t1);
		}

		static int cppc_cpufreq_set_boost(struct cpufreq_policy *policy, int state)
		{
		struct cppc_cpudata *cpudata;
		struct cppc_cpudata *cpu_data = all_cpu_data[policy->cpu];
		struct cppc_perf_caps *caps = &cpu_data->perf_caps;
		int ret;

		if (!boost_supported) {
		@@ -379,13 +381,12 @@ static int cppc_cpufreq_set_boost(struct cpufreq_policy *policy, int state)
		return -EINVAL;
		}

		cpudata = all_cpu_data[policy->cpu];
		if (state)
		policy->max = cppc_cpufreq_perf_to_khz(cpudata,
		cpudata->perf_caps.highest_perf);
		policy->max = cppc_cpufreq_perf_to_khz(cpu_data,
		caps->highest_perf);
		else
		policy->max = cppc_cpufreq_perf_to_khz(cpudata,
		cpudata->perf_caps.nominal_perf);
		policy->max = cppc_cpufreq_perf_to_khz(cpu_data,
		caps->nominal_perf);
		policy->cpuinfo.max_freq = policy->max;

		ret = freq_qos_update_request(policy->max_freq_req, policy->max);
		@@ -412,17 +413,17 @@ static struct cpufreq_driver cppc_cpufreq_driver = {
		* platform specific mechanism. We reuse the desired performance register to
		* store the real performance calculated by the platform.
		*/
		static unsigned int hisi_cppc_cpufreq_get_rate(unsigned int cpunum)
		static unsigned int hisi_cppc_cpufreq_get_rate(unsigned int cpu)
		{
		struct cppc_cpudata *cpudata = all_cpu_data[cpunum];
		struct cppc_cpudata *cpu_data = all_cpu_data[cpu];
		u64 desired_perf;
		int ret;

		ret = cppc_get_desired_perf(cpunum, &desired_perf);
		ret = cppc_get_desired_perf(cpu, &desired_perf);
		if (ret < 0)
		return -EIO;

		return cppc_cpufreq_perf_to_khz(cpudata, desired_perf);
		return cppc_cpufreq_perf_to_khz(cpu_data, desired_perf);
		}

		static void cppc_check_hisi_workaround(void)
		@@ -450,8 +451,8 @@ static void cppc_check_hisi_workaround(void)

		static int __init cppc_cpufreq_init(void)
		{
		struct cppc_cpudata *cpu_data;
		int i, ret = 0;
		struct cppc_cpudata *cpu;

		if (acpi_disabled)
		return -ENODEV;
		@@ -466,8 +467,8 @@ static int __init cppc_cpufreq_init(void)
		if (!all_cpu_data[i])
		goto out;

		cpu = all_cpu_data[i];
		if (!zalloc_cpumask_var(&cpu->shared_cpu_map, GFP_KERNEL))
		cpu_data = all_cpu_data[i];
		if (!zalloc_cpumask_var(&cpu_data->shared_cpu_map, GFP_KERNEL))
		goto out;
		}

		@@ -487,11 +488,11 @@ static int __init cppc_cpufreq_init(void)

		out:
		for_each_possible_cpu(i) {
		cpu = all_cpu_data[i];
		if (!cpu)
		cpu_data = all_cpu_data[i];
		if (!cpu_data)
		break;
		free_cpumask_var(cpu->shared_cpu_map);
		kfree(cpu);
		free_cpumask_var(cpu_data->shared_cpu_map);
		kfree(cpu_data);
		}

		kfree(all_cpu_data);
		@@ -500,15 +501,15 @@ out:

		static void __exit cppc_cpufreq_exit(void)
		{
		struct cppc_cpudata *cpu;
		struct cppc_cpudata *cpu_data;
		int i;

		cpufreq_unregister_driver(&cppc_cpufreq_driver);

		for_each_possible_cpu(i) {
		cpu = all_cpu_data[i];
		free_cpumask_var(cpu->shared_cpu_map);
		kfree(cpu);
		cpu_data = all_cpu_data[i];
		free_cpumask_var(cpu_data->shared_cpu_map);
		kfree(cpu_data);
		}

		kfree(all_cpu_data);

drivers/cpufreq/cpufreq-dt-platdev.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -119,10 +119,12 @@ static const struct of_device_id blacklist[] __initconst = {
		{ .compatible = "mediatek,mt2712", },
		{ .compatible = "mediatek,mt7622", },
		{ .compatible = "mediatek,mt7623", },
		{ .compatible = "mediatek,mt8167", },
		{ .compatible = "mediatek,mt817x", },
		{ .compatible = "mediatek,mt8173", },
		{ .compatible = "mediatek,mt8176", },
		{ .compatible = "mediatek,mt8183", },
		{ .compatible = "mediatek,mt8516", },

		{ .compatible = "nvidia,tegra20", },
		{ .compatible = "nvidia,tegra30", },

drivers/cpufreq/cpufreq.c

+44 −41

Original line number	Diff line number	Diff line
		@@ -298,8 +298,10 @@ struct cpufreq_policy *cpufreq_cpu_acquire(unsigned int cpu)
		* EXTERNALLY AFFECTING FREQUENCY CHANGES *
		*********************************************************************/

		/*
		* adjust_jiffies - adjust the system "loops_per_jiffy"
		/**
		* adjust_jiffies - Adjust the system "loops_per_jiffy".
		* @val: CPUFREQ_PRECHANGE or CPUFREQ_POSTCHANGE.
		* @ci: Frequency change information.
		*
		* This function alters the system "loops_per_jiffy" for the clock
		* speed change. Note that loops_per_jiffy cannot be updated on SMP
		@@ -331,14 +333,14 @@ static void adjust_jiffies(unsigned long val, struct cpufreq_freqs *ci)
		}

		/**
		* cpufreq_notify_transition - Notify frequency transition and adjust_jiffies.
		* cpufreq_notify_transition - Notify frequency transition and adjust jiffies.
		* @policy: cpufreq policy to enable fast frequency switching for.
		* @freqs: contain details of the frequency update.
		* @state: set to CPUFREQ_PRECHANGE or CPUFREQ_POSTCHANGE.
		*
		* This function calls the transition notifiers and the "adjust_jiffies"
		* function. It is called twice on all CPU frequency changes that have
		* external effects.
		* This function calls the transition notifiers and adjust_jiffies().
		*
		* It is called twice on all CPU frequency changes that have external effects.
		*/
		static void cpufreq_notify_transition(struct cpufreq_policy *policy,
		struct cpufreq_freqs *freqs,
		@@ -1391,8 +1393,10 @@ static int cpufreq_online(unsigned int cpu)

		policy->min_freq_req = kzalloc(2 * sizeof(*policy->min_freq_req),
		GFP_KERNEL);
		if (!policy->min_freq_req)
		if (!policy->min_freq_req) {
		ret = -ENOMEM;
		goto out_destroy_policy;
		}

		ret = freq_qos_add_request(&policy->constraints,
		policy->min_freq_req, FREQ_QOS_MIN,
		@@ -1429,6 +1433,7 @@ static int cpufreq_online(unsigned int cpu)
		if (cpufreq_driver->get && has_target()) {
		policy->cur = cpufreq_driver->get(policy->cpu);
		if (!policy->cur) {
		ret = -EIO;
		pr_err("%s: ->get() failed\n", __func__);
		goto out_destroy_policy;
		}
		@@ -1646,13 +1651,12 @@ static void cpufreq_remove_dev(struct device dev, struct subsys_interface sif)
		}

		/**
		* cpufreq_out_of_sync - If actual and saved CPU frequency differs, we're
		* in deep trouble.
		* @policy: policy managing CPUs
		* @new_freq: CPU frequency the CPU actually runs at
		* cpufreq_out_of_sync - Fix up actual and saved CPU frequency difference.
		* @policy: Policy managing CPUs.
		* @new_freq: New CPU frequency.
		*
		* We adjust to current frequency first, and need to clean up later.
		* So either call to cpufreq_update_policy() or schedule handle_update()).
		* Adjust to the current frequency first and clean up later by either calling
		* cpufreq_update_policy(), or scheduling handle_update().
		*/
		static void cpufreq_out_of_sync(struct cpufreq_policy *policy,
		unsigned int new_freq)
		@@ -1832,7 +1836,7 @@ int cpufreq_generic_suspend(struct cpufreq_policy *policy)
		EXPORT_SYMBOL(cpufreq_generic_suspend);

		/**
		* cpufreq_suspend() - Suspend CPUFreq governors
		* cpufreq_suspend() - Suspend CPUFreq governors.
		*
		* Called during system wide Suspend/Hibernate cycles for suspending governors
		* as some platforms can't change frequency after this point in suspend cycle.
		@@ -1868,7 +1872,7 @@ suspend:
		}

		/**
		* cpufreq_resume() - Resume CPUFreq governors
		* cpufreq_resume() - Resume CPUFreq governors.
		*
		* Called during system wide Suspend/Hibernate cycle for resuming governors that
		* are suspended with cpufreq_suspend().
		@@ -1920,10 +1924,10 @@ bool cpufreq_driver_test_flags(u16 flags)
		}

		/**
		* cpufreq_get_current_driver - return current driver's name
		* cpufreq_get_current_driver - Return the current driver's name.
		*
		* Return the name string of the currently loaded cpufreq driver
		* or NULL, if none.
		* Return the name string of the currently registered cpufreq driver or NULL if
		* none.
		*/
		const char *cpufreq_get_current_driver(void)
		{
		@@ -1935,10 +1939,10 @@ const char *cpufreq_get_current_driver(void)
		EXPORT_SYMBOL_GPL(cpufreq_get_current_driver);

		/**
		* cpufreq_get_driver_data - return current driver data
		* cpufreq_get_driver_data - Return current driver data.
		*
		* Return the private data of the currently loaded cpufreq
		* driver, or NULL if no cpufreq driver is loaded.
		* Return the private data of the currently registered cpufreq driver, or NULL
		* if no cpufreq driver has been registered.
		*/
		void *cpufreq_get_driver_data(void)
		{
		@@ -1954,17 +1958,16 @@ EXPORT_SYMBOL_GPL(cpufreq_get_driver_data);
		*********************************************************************/

		/**
		* cpufreq_register_notifier - register a driver with cpufreq
		* @nb: notifier function to register
		* @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER
		* cpufreq_register_notifier - Register a notifier with cpufreq.
		* @nb: notifier function to register.
		* @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER.
		*
		* Add a driver to one of two lists: either a list of drivers that
		* are notified about clock rate changes (once before and once after
		* the transition), or a list of drivers that are notified about
		* changes in cpufreq policy.
		* Add a notifier to one of two lists: either a list of notifiers that run on
		* clock rate changes (once before and once after every transition), or a list
		* of notifiers that ron on cpufreq policy changes.
		*
		* This function may sleep, and has the same return conditions as
		* blocking_notifier_chain_register.
		* This function may sleep and it has the same return values as
		* blocking_notifier_chain_register().
		*/
		int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list)
		{
		@@ -2001,14 +2004,14 @@ int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list)
		EXPORT_SYMBOL(cpufreq_register_notifier);

		/**
		* cpufreq_unregister_notifier - unregister a driver with cpufreq
		* @nb: notifier block to be unregistered
		* @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER
		* cpufreq_unregister_notifier - Unregister a notifier from cpufreq.
		* @nb: notifier block to be unregistered.
		* @list: CPUFREQ_TRANSITION_NOTIFIER or CPUFREQ_POLICY_NOTIFIER.
		*
		* Remove a driver from the CPU frequency notifier list.
		* Remove a notifier from one of the cpufreq notifier lists.
		*
		* This function may sleep, and has the same return conditions as
		* blocking_notifier_chain_unregister.
		* This function may sleep and it has the same return values as
		* blocking_notifier_chain_unregister().
		*/
		int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list)
		{
		@@ -2123,7 +2126,7 @@ static int __target_intermediate(struct cpufreq_policy *policy,
		static int __target_index(struct cpufreq_policy *policy, int index)
		{
		struct cpufreq_freqs freqs = {.old = policy->cur, .flags = 0};
		unsigned int intermediate_freq = 0;
		unsigned int restore_freq, intermediate_freq = 0;
		unsigned int newfreq = policy->freq_table[index].frequency;
		int retval = -EINVAL;
		bool notify;
		@@ -2131,6 +2134,9 @@ static int __target_index(struct cpufreq_policy *policy, int index)
		if (newfreq == policy->cur)
		return 0;

		/* Save last value to restore later on errors */
		restore_freq = policy->cur;

		notify = !(cpufreq_driver->flags & CPUFREQ_ASYNC_NOTIFICATION);
		if (notify) {
		/* Handle switching to intermediate frequency */
		@@ -2168,7 +2174,7 @@ static int __target_index(struct cpufreq_policy *policy, int index)
		*/
		if (unlikely(retval && intermediate_freq)) {
		freqs.old = intermediate_freq;
		freqs.new = policy->restore_freq;
		freqs.new = restore_freq;
		cpufreq_freq_transition_begin(policy, &freqs);
		cpufreq_freq_transition_end(policy, &freqs, 0);
		}
		@@ -2203,9 +2209,6 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy,
		!(cpufreq_driver->flags & CPUFREQ_NEED_UPDATE_LIMITS))
		return 0;

		/* Save last value to restore later on errors */
		policy->restore_freq = policy->cur;

		if (cpufreq_driver->target)
		return cpufreq_driver->target(policy, target_freq, relation);

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