linux-kernel - [PATCH v2 3/4] cpufreq: mediatek: Add CPUFREQ_ASYNC

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Message-ID: <20241108063942.19744-4-chun-jen.tseng@mediatek.com>
Date: Fri, 8 Nov 2024 14:39:41 +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 3/4] cpufreq: mediatek: Add CPUFREQ_ASYNC_NOTIFICATION flag

Add CPUFREQ_ASYNC_NOTIFICATION flages for cpufreq policy because some of
process will get CPU frequency by cpufreq sysfs node. It may get wrong
frequency then call cpufreq_out_of_sync() to fixed frequency.

Signed-off-by: Mark Tseng <chun-jen.tseng@...iatek.com>
---
 drivers/cpufreq/mediatek-cpufreq.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/mediatek-cpufreq.c b/drivers/cpufreq/mediatek-cpufreq.c
index 6b3cd2b803bf..3369bdd9a348 100644
--- a/drivers/cpufreq/mediatek-cpufreq.c
+++ b/drivers/cpufreq/mediatek-cpufreq.c
@@ -209,12 +209,16 @@ static int mtk_cpufreq_set_target(struct cpufreq_policy *policy,
 	struct dev_pm_opp *opp;
 	long freq_hz, pre_freq_hz;
 	int vproc, pre_vproc, inter_vproc, target_vproc, ret;
+	struct cpufreq_freqs freqs;
 
 	mutex_lock(&mtk_policy_lock);
 
 	inter_vproc = info->intermediate_voltage;
+	pre_freq_hz = policy->cur * 1000;
 
-	pre_freq_hz = clk_get_rate(cpu_clk);
+	freqs.old = policy->cur;
+	freqs.new = freq_table[index].frequency;
+	cpufreq_freq_transition_begin(policy, &freqs);
 
 	if (unlikely(info->pre_vproc <= 0))
 		pre_vproc = regulator_get_voltage(info->proc_reg);
@@ -309,6 +313,7 @@ static int mtk_cpufreq_set_target(struct cpufreq_policy *policy,
 	info->current_freq = freq_hz;
 
 out:
+	cpufreq_freq_transition_end(policy, &freqs, false);
 	mutex_unlock(&mtk_policy_lock);
 
 	return ret;
@@ -632,6 +637,7 @@ static unsigned int mtk_cpufreq_get(unsigned int cpu)
 static struct cpufreq_driver mtk_cpufreq_driver = {
 	.flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK |
 		 CPUFREQ_HAVE_GOVERNOR_PER_POLICY |
+		 CPUFREQ_ASYNC_NOTIFICATION |
 		 CPUFREQ_IS_COOLING_DEV,
 	.verify = cpufreq_generic_frequency_table_verify,
 	.target_index = mtk_cpufreq_set_target,
-- 
2.45.2