From: Youngtae Lee <yt0729.lee@samsung.com>
Date: Fri, 4 May 2018 06:26:16 +0000 (+0900)
Subject: samsung: cpupm: Add cpuhp_last_cpu mask to indecating last_cpu
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=93775b64efadae9b491b43c93ab0cd6b193c5c81;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

samsung: cpupm: Add cpuhp_last_cpu mask to indecating last_cpu

this mask shows cpus that should perform
the cluster power down sequence.

Change-Id: If41ecb630191674dc47995808c383688aa0d8d55
Signed-off-by: Youngtae Lee <yt0729.lee@samsung.com>
---

diff --git a/drivers/soc/samsung/exynos-cpupm.c b/drivers/soc/samsung/exynos-cpupm.c
index 9588f912058a..c76c27d2f12a 100644
--- a/drivers/soc/samsung/exynos-cpupm.c
+++ b/drivers/soc/samsung/exynos-cpupm.c
@@ -298,13 +298,25 @@ static void cluster_disable(unsigned int cpu_id)
 /******************************************************************************
  *                               CPU HOTPLUG                                  *
  ******************************************************************************/
+/* cpumask for indecating last cpu of a cluster */
+struct cpumask cpuhp_last_cpu;
+
+bool exynos_cpuhp_last_cpu(unsigned int cpu)
+{
+	return cpumask_test_cpu(cpu, &cpuhp_last_cpu);
+}
+
 static int cpuhp_cpupm_online(unsigned int cpu)
 {
 	struct cpumask mask;
 
 	cpumask_and(&mask, cpu_coregroup_mask(cpu), cpu_online_mask);
-	if (cpumask_weight(&mask) == 0)
+	if (cpumask_weight(&mask) == 0) {
 		cluster_enable(cpu);
+		/* clear cpus of this cluster from cpuhp_last_cpu */
+		cpumask_andnot(&cpuhp_last_cpu,
+			&cpuhp_last_cpu, cpu_coregroup_mask(cpu));
+	}
 
 	cpu_enable(cpu);
 
@@ -318,8 +330,11 @@ static int cpuhp_cpupm_offline(unsigned int cpu)
 	cpu_disable(cpu);
 
 	cpumask_and(&mask, cpu_coregroup_mask(cpu), cpu_online_mask);
-	if (cpumask_weight(&mask) == 0)
+	if (cpumask_weight(&mask) == 0) {
+		/* set cpu cpuhp_last_cpu */
+		cpumask_set_cpu(cpu, &cpuhp_last_cpu);
 		cluster_disable(cpu);
+	}
 
 	return 0;
 }
diff --git a/include/soc/samsung/exynos-cpupm.h b/include/soc/samsung/exynos-cpupm.h
index eb132497d34a..06292fc19ee1 100644
--- a/include/soc/samsung/exynos-cpupm.h
+++ b/include/soc/samsung/exynos-cpupm.h
@@ -17,6 +17,10 @@ enum {
 	POWERMODE_TYPE_SYSTEM,
 };
 
+extern void disable_power_mode(int cpu, int type);
+extern void enable_power_mode(int cpu, int type);
+extern bool exynos_cpuhp_last_cpu(unsigned int cpu);
+
 #ifdef CONFIG_CPU_IDLE
 void exynos_update_ip_idle_status(int index, int idle);
 int exynos_get_idle_ip_index(const char *name);