FAILED: patch "[PATCH] cpufreq: intel_pstate: Fix active mode offline/online EPP" failed to apply to 5.10-stable tree

The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From ed38eb49d101e829ae0f8c0a0d3bf5cb6bcbc6b2 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <[email protected]>
Date: Wed, 17 Nov 2021 14:57:31 +0100
Subject: [PATCH] cpufreq: intel_pstate: Fix active mode offline/online EPP
handling

After commit 4adcf2e5829f ("cpufreq: intel_pstate: Add ->offline and ->online callbacks") the EPP value set by the "performance" scaling algorithm in the active mode is not restored after an offline/online cycle which replaces it with the saved EPP value coming from user space.

Address this issue by forcing intel_pstate_hwp_set() to set a new EPP value when it runs first time after online.

index 1088ff350159..1bc00645b656 100644
@@ -1006,6 +1006,12 @@ static void intel_pstate_hwp_offline(struct cpudata *cpu)
 		 */
 		value &= ~GENMASK_ULL(31, 24);
 		value |= HWP_ENERGY_PERF_PREFERENCE(cpu->epp_cached);
+		/*
+		 * However, make sure that EPP will be set to "performance" when
+		 * the CPU is brought back online again and the "performance"
+		 * scaling algorithm is still in effect.
+		 */
+		cpu->epp_policy = CPUFREQ_POLICY_UNKNOWN;
 	}
 
 	/*