[PATCH 08/19] cpufreq: amd: add boost mode support for amd-pstate

[Huang Rui]

If the sbios supports the boost mode of amd-pstate, let's switch to
boost enabled by default.

Signed-off-by: Huang Rui <ray.huang@xxxxxxx>
---
 drivers/cpufreq/amd-pstate.c | 50 ++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index ea965a122431..67a9a117f524 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -75,6 +75,8 @@ struct amd_cpudata {
 	u32	min_freq;
 	u32	nominal_freq;
 	u32	lowest_nonlinear_freq;
+
+	bool	boost_supported;
 };
 
 struct amd_pstate_perf_funcs {
@@ -229,6 +231,19 @@ amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf,
 				      max_perf, fast_switch);
 }
 
+static bool amd_pstate_boost_supported(struct amd_cpudata *cpudata)
+{
+	u32 highest_perf, nominal_perf;
+
+	highest_perf = READ_ONCE(cpudata->highest_perf);
+	nominal_perf = READ_ONCE(cpudata->nominal_perf);
+
+	if (highest_perf > nominal_perf)
+		return true;
+
+	return false;
+}
+
 static int amd_pstate_verify(struct cpufreq_policy_data *policy)
 {
 	cpufreq_verify_within_cpu_limits(policy);
@@ -402,6 +417,37 @@ static int amd_get_lowest_nonlinear_freq(struct amd_cpudata *cpudata)
 	return lowest_nonlinear_freq * 1000;
 }
 
+static int amd_pstate_set_boost(struct cpufreq_policy *policy, int state)
+{
+	struct amd_cpudata *cpudata = policy->driver_data;
+	int ret;
+
+	if (!cpudata->boost_supported) {
+		pr_err("Boost mode is not supported by this processor or SBIOS\n");
+		return -EINVAL;
+	}
+
+	if (state)
+		policy->cpuinfo.max_freq = cpudata->max_freq;
+	else
+		policy->cpuinfo.max_freq = cpudata->nominal_freq;
+
+	policy->max = policy->cpuinfo.max_freq;
+
+	ret = freq_qos_update_request(&cpudata->req[1],
+				      policy->cpuinfo.max_freq);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static void amd_pstate_boost_init(struct amd_cpudata *cpudata)
+{
+	cpudata->boost_supported = true;
+	amd_pstate_driver.boost_enabled = true;
+}
+
 static int amd_pstate_init_freqs_in_cpudata(struct amd_cpudata *cpudata,
 					    u32 max_freq, u32 min_freq,
 					    u32 nominal_freq,
@@ -504,6 +550,9 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy)
 
 	policy->driver_data = cpudata;
 
+	if (amd_pstate_boost_supported(cpudata))
+		amd_pstate_boost_init(cpudata);
+
 	return 0;
 
 free_cpudata3:
@@ -535,6 +584,7 @@ static struct cpufreq_driver amd_pstate_driver = {
 	.fast_switch    = amd_pstate_fast_switch,
 	.init		= amd_pstate_cpu_init,
 	.exit		= amd_pstate_cpu_exit,
+	.set_boost	= amd_pstate_set_boost,
 	.name		= "amd-pstate",
 };
 
-- 
2.25.1