cpufreq: amd-pstate: Add resume and suspend callbacks

When system resumes from S3, the CPPC enable register will be
cleared and reset to 0.

So enable the CPPC interface by writing 1 to this register on
system resume and disable it during system suspend.

Signed-off-by: Jinzhou Su <[email protected]>
Signed-off-by: Jinzhou Su <[email protected]>
Acked-by: Huang Rui <[email protected]>
[ rjw: Subject and changelog edits ]
Cc: All applicable <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: JinzhouSu

drivers/cpufreq/amd-pstate.c

@@ -566,6 +566,28 @@ static int amd_pstate_cpu_exit(struct cpufreq_policy *policy)
 	return 0;
 }
 
+static int amd_pstate_cpu_resume(struct cpufreq_policy *policy)
+{
+	int ret;
+
+	ret = amd_pstate_enable(true);
+	if (ret)
+		pr_err("failed to enable amd-pstate during resume, return %d\n", ret);
+
+	return ret;
+}
+
+static int amd_pstate_cpu_suspend(struct cpufreq_policy *policy)
+{
+	int ret;
+
+	ret = amd_pstate_enable(false);
+	if (ret)
+		pr_err("failed to disable amd-pstate during suspend, return %d\n", ret);
+
+	return ret;
+}
+
 /* Sysfs attributes */
 
 /*
@@ -636,6 +658,8 @@ static struct cpufreq_driver amd_pstate_driver = {
 	.target		= amd_pstate_target,
 	.init		= amd_pstate_cpu_init,
 	.exit		= amd_pstate_cpu_exit,
+	.suspend	= amd_pstate_cpu_suspend,
+	.resume		= amd_pstate_cpu_resume,
 	.set_boost	= amd_pstate_set_boost,
 	.name		= "amd-pstate",
 	.attr           = amd_pstate_attr,