linux-kernel - [PATCH 5.15 525/917] cpufreq: intel_pstate: Fix cpu->pstate.turbo

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Message-Id: <20211115165446.564714772@linuxfoundation.org>
Date:   Mon, 15 Nov 2021 18:00:20 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zhang Rui <rui.zhang@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 525/917] cpufreq: intel_pstate: Fix cpu->pstate.turbo_freq initialization

From: Zhang Rui <rui.zhang@...el.com>

[ Upstream commit c72bcf0ab87a92634e58af62e89af0f40dfd0b88 ]

Fix a problem in active mode that cpu->pstate.turbo_freq is initialized
only if HWP-to-frequency scaling factor is refined.

In passive mode, this problem is not exposed, because
cpu->pstate.turbo_freq is set again, later in
intel_cpufreq_cpu_init()->intel_pstate_get_hwp_cap().

Fixes: eb3693f0521e ("cpufreq: intel_pstate: hybrid: CPU-specific scaling factor")
Signed-off-by: Zhang Rui <rui.zhang@...el.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/cpufreq/intel_pstate.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 8c176b7dae415..fc7a429f22d33 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -537,7 +537,8 @@ static void intel_pstate_hybrid_hwp_adjust(struct cpudata *cpu)
 	 * scaling factor is too high, so recompute it to make the HWP_CAP
 	 * highest performance correspond to the maximum turbo frequency.
 	 */
-	if (turbo_freq < cpu->pstate.turbo_pstate * scaling) {
+	cpu->pstate.turbo_freq = cpu->pstate.turbo_pstate * scaling;
+	if (turbo_freq < cpu->pstate.turbo_freq) {
 		cpu->pstate.turbo_freq = turbo_freq;
 		scaling = DIV_ROUND_UP(turbo_freq, cpu->pstate.turbo_pstate);
 		cpu->pstate.scaling = scaling;
-- 
2.33.0