[PATCH v2 1/2] cpufreq: Allow drivers to advertise boost enabled

[Mario Limonciello <mario.limonciello@amd.com>]

The behavior introduced in commit f37a4d6b4a2c ("cpufreq: Fix per-policy
boost behavior on SoCs using cpufreq_boost_set_sw()") sets up the boost
policy incorrectly when boost has been enabled by the platform firmware
initially even if a driver sets the policy up.

This is because policy_has_boost_freq() assumes that there is a frequency
table set up by the driver and that the boost frequencies are advertised
in that table. This assumption doesn't work for acpi-cpufreq or
amd-pstate. Only use this check to enable boost if it's not already
enabled instead of also disabling it if alreayd enabled.

Reviewed-by: Sibi Sankar <quic_sibis@quicinc.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Fixes: f37a4d6b4a2c ("cpufreq: Fix per-policy boost behavior on SoCs using cpufreq_boost_set_sw()")
Suggested-by: Viresh Kumar <viresh.kumar@linaro.org>
Suggested-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
Cc: Sibi Sankar <quic_sibis@quicinc.com>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Dhruva Gole <d-gole@ti.com>
Cc: Yipeng Zou <zouyipeng@huawei.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
v1->v2
 * Pick up tags
---
 drivers/cpufreq/cpufreq.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 1fdabb660231..270ea04fb616 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1430,7 +1430,8 @@ static int cpufreq_online(unsigned int cpu)
 		}
 
 		/* Let the per-policy boost flag mirror the cpufreq_driver boost during init */
-		policy->boost_enabled = cpufreq_boost_enabled() && policy_has_boost_freq(policy);
+		if (cpufreq_boost_enabled() && policy_has_boost_freq(policy))
+			policy->boost_enabled = true;
 
 		/*
 		 * The initialization has succeeded and the policy is online.
-- 
2.43.0