Commit b376471f authored by Jinzhou Su's avatar Jinzhou Su Committed by Rafael J. Wysocki
Browse files

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: default avatarJinzhou Su <Jinzhou.Su@amd.com>
Signed-off-by: default avatarJinzhou Su <Jinzhou.Su@amd.com>
Acked-by: default avatarHuang Rui <ray.huang@amd.com>
[ rjw: Subject and changelog edits ]
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent a111daf0

drivers/cpufreq/amd-pstate.c

+24 −0
Original line number Diff line number Diff line
@@ -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,