linux-kernel - [PATCH v2 1/4] cpufreq: mediatek: CCI support SoC , the transition

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Message-ID: <20241108063942.19744-2-chun-jen.tseng@mediatek.com>
Date: Fri, 8 Nov 2024 14:39:39 +0800
From: Mark Tseng <chun-jen.tseng@...iatek.com>
To: "Rafael J . Wysocki" <rafael@...nel.org>, Viresh Kumar
	<viresh.kumar@...aro.org>, MyungJoo Ham <myungjoo.ham@...sung.com>, Kyungmin
 Park <kyungmin.park@...sung.com>, Chanwoo Choi <cw00.choi@...sung.com>,
	Matthias Brugger <matthias.bgg@...il.com>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>
CC: <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-mediatek@...ts.infradead.org>,
	<Project_Global_Chrome_Upstream_Group@...iatek.com>,
	<chun-jen.tseng@...iatek.com>
Subject: [PATCH v2 1/4] cpufreq: mediatek: CCI support SoC , the transition_delay set to 10 ms

SoC with CCI architecture should set transition_delay to 10 ms because
cpufreq need to call devfreq notifier in async mode. if delay less than
10 ms, it may get wrong OPP-level in devfreq passive governor.

Signed-off-by: Mark Tseng <chun-jen.tseng@...iatek.com>
---
 drivers/cpufreq/mediatek-cpufreq.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/cpufreq/mediatek-cpufreq.c b/drivers/cpufreq/mediatek-cpufreq.c
index 663f61565cf7..f63183154e9a 100644
--- a/drivers/cpufreq/mediatek-cpufreq.c
+++ b/drivers/cpufreq/mediatek-cpufreq.c
@@ -597,6 +597,9 @@ static int mtk_cpufreq_init(struct cpufreq_policy *policy)
 	policy->driver_data = info;
 	policy->clk = info->cpu_clk;
 
+	if (info->soc_data->ccifreq_supported)
+		policy->transition_delay_us = 10000;
+
 	return 0;
 }
 
-- 
2.45.2