[RFC PATCH 2/3] cpufreq: Add SW BOOST support for drivers without frequency table

[Xiongfeng Wang]

Software-managed BOOST get the boost frequency by check the flag
CPUFREQ_BOOST_FREQ at driver's frequency table. But some cpufreq driver
don't have frequency table and use other methods to get the frequency
range, such CPPC cpufreq driver.

To add SW BOOST support for drivers without frequency table, we add
members in 'cpufreq_policy.cpufreq_cpuinfo' to record the max frequency
of boost mode and non-boost mode. The cpufreq driver initialize these two
members when probing.

Signed-off-by: Xiongfeng Wang <wangxiongfeng2@xxxxxxxxxx>
---
 drivers/cpufreq/cpufreq.c | 23 +++++++++++++++--------
 include/linux/cpufreq.h   |  2 ++
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 475fb1b..a299426 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -2508,15 +2508,22 @@ static int cpufreq_boost_set_sw(int state)
 	int ret = -EINVAL;
 
 	for_each_active_policy(policy) {
-		if (!policy->freq_table)
-			continue;
-
-		ret = cpufreq_frequency_table_cpuinfo(policy,
+		if (policy->freq_table) {
+			ret = cpufreq_frequency_table_cpuinfo(policy,
 						      policy->freq_table);
-		if (ret) {
-			pr_err("%s: Policy frequency update failed\n",
-			       __func__);
-			break;
+			if (ret) {
+				pr_err("%s: Policy frequency update failed\n",
+				       __func__);
+				break;
+			}
+		} else if (policy->cpuinfo.boost_max_freq) {
+			if (state)
+				policy->max = policy->cpuinfo.boost_max_freq;
+			else
+				policy->max = policy->cpuinfo.nonboost_max_freq;
+			policy->cpuinfo.max_freq = policy->max;
+		} else {
+			continue;
 		}
 
 		ret = freq_qos_update_request(policy->max_freq_req, policy->max);
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 018dce8..c3449e6 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -43,6 +43,8 @@ enum cpufreq_table_sorting {
 struct cpufreq_cpuinfo {
 	unsigned int		max_freq;
 	unsigned int		min_freq;
+	unsigned int		boost_max_freq;
+	unsigned int		nonboost_max_freq;
 
 	/* in 10^(-9) s = nanoseconds */
 	unsigned int		transition_latency;
-- 
1.7.12.4