Merge "arm: topology: Allow specifying the CPU efficiency from device tree" (f88da36d) · Commits · e / devices / android_kernel_sony_msm8998

arch/arm/kernel/topology.c

+28 −6

Original line number	Diff line number	Diff line
		@@ -190,6 +190,13 @@ static int __init parse_cluster(struct device_node *cluster, int depth)
		return 0;
		}

		static DEFINE_PER_CPU(unsigned long, cpu_efficiency) = SCHED_CAPACITY_SCALE;

		unsigned long arch_get_cpu_efficiency(int cpu)
		{
		return per_cpu(cpu_efficiency, cpu);
		}

		#ifdef CONFIG_OF
		struct cpu_efficiency {
		const char *compatible;
		@@ -266,6 +273,7 @@ static int __init parse_dt_topology(void)
		for_each_possible_cpu(cpu) {
		const u32 *rate;
		int len;
		u32 efficiency;

		/* too early to use cpu->of_node */
		cn = of_get_cpu_node(cpu, NULL);
		@@ -274,13 +282,27 @@ static int __init parse_dt_topology(void)
		continue;
		}

		for (cpu_eff = table_efficiency; cpu_eff->compatible; cpu_eff++)
		if (of_device_is_compatible(cn, cpu_eff->compatible))
		/*
		* The CPU efficiency value passed from the device tree
		* overrides the value defined in the table_efficiency[]
		*/
		if (of_property_read_u32(cn, "efficiency", &efficiency) < 0) {

		for (cpu_eff = table_efficiency;
		cpu_eff->compatible; cpu_eff++)

		if (of_device_is_compatible(cn,
		cpu_eff->compatible))
		break;

		if (cpu_eff->compatible == NULL)
		continue;

		efficiency = cpu_eff->efficiency;
		}

		per_cpu(cpu_efficiency, cpu) = efficiency;

		rate = of_get_property(cn, "clock-frequency", &len);
		if (!rate \|\| len != 4) {
		pr_err("%s missing clock-frequency property\n",
		@@ -288,7 +310,7 @@ static int __init parse_dt_topology(void)
		continue;
		}

		capacity = ((be32_to_cpup(rate)) >> 20) * cpu_eff->efficiency;
		capacity = ((be32_to_cpup(rate)) >> 20) * efficiency;

		/* Save min capacity of the system */
		if (capacity < min_capacity)