Commit 2e1185c9 authored by Shashank Balaji's avatar Shashank Balaji Committed by Rafael J. Wysocki
Browse files

cpufreq: userspace: set CPUFREQ_GOV_STRICT_TARGET flag 



When the userspace governor is used, the user intends to set a fixed CPU
frequency for a policy, for whatever reason. The CPUFREQ_GOV_STRICT_TARGET
flag is the required behaviour. Without this flag, the intel_pstate driver,
with HWP enabled, will set HWP_MIN_PERF to the target frequency and
HWP_MAX_PERF to the policy maximum, when configuring the HWP_REQUEST MSR.

This lets the hardware choose any frequency between the target frequency
and the policy maximum, which is not the intended behaviour. To fix this,
`cat scaling_setspeed > scaling_max_freq` had to be done. With this patch,
that is no longer necessary. Setting scaling_setspeed is sufficient, as
expected.

Signed-off-by: default avatarShashank Balaji <shashank.mahadasyam@sony.com>
Link: https://patch.msgid.link/20250527-userspace-governor-doc-v2-1-0e22c69920f2@sony.com


Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent c83a92df

drivers/cpufreq/cpufreq_userspace.c

+1 −0
Original line number Diff line number Diff line
@@ -134,6 +134,7 @@ static struct cpufreq_governor cpufreq_gov_userspace = { 
	.store_setspeed	= cpufreq_set,

	.show_setspeed	= show_speed,

	.owner		= THIS_MODULE,

	.flags		= CPUFREQ_GOV_STRICT_TARGET,

};



MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>, "