From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Date: Mon, 27 Mar 2017 22:11:53 +0000 (+0200)
Subject: cpufreq: intel_pstate: Skip unnecessary PID resets on init
X-Git-Tag: v4.12-rc6~35^2~7^2~10
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=694cb173475a048a05daebf27cc8fdb7865c158b;p=platform%2Fkernel%2Flinux-exynos.git

cpufreq: intel_pstate: Skip unnecessary PID resets on init

PID controller parameters only need to be initialized if the
get_target_pstate_use_performance() P-state selection routine
is going to be used.  It is not necessary to initialize them
otherwise, so don't do that.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index b631ab0..ee61db9 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -1911,12 +1911,12 @@ static int intel_pstate_init_cpu(unsigned int cpunum)
 			intel_pstate_disable_ee(cpunum);
 
 		intel_pstate_hwp_enable(cpu);
+	} else if (pstate_funcs.get_target_pstate == get_target_pstate_use_performance) {
+		intel_pstate_pid_reset(cpu);
 	}
 
 	intel_pstate_get_cpu_pstates(cpu);
 
-	intel_pstate_pid_reset(cpu);
-
 	pr_debug("controlling: cpu %d\n", cpunum);
 
 	return 0;