linux-kernel - [PATCH 2/4] PM / devfreq: Limit max_freq with scaling_min

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Message-ID: <20250421030020.3108405-3-zhenglifeng1@huawei.com>
Date: Mon, 21 Apr 2025 11:00:18 +0800
From: Lifeng Zheng <zhenglifeng1@...wei.com>
To: <myungjoo.ham@...sung.com>, <kyungmin.park@...sung.com>,
	<cw00.choi@...sung.com>
CC: <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linuxarm@...wei.com>, <jonathan.cameron@...wei.com>,
	<zhanjie9@...ilicon.com>, <lihuisong@...wei.com>, <yubowen8@...wei.com>,
	<cenxinghai@...artners.com>, <zhenglifeng1@...wei.com>
Subject: [PATCH 2/4] PM / devfreq: Limit max_freq with scaling_min_freq

Limit max_freq in devfreq_get_freq_range() with scaling_min_freq to avoid
showing an unreachable freq when reading it.

Use macro clamp to simplify code.

Signed-off-by: Lifeng Zheng <zhenglifeng1@...wei.com>
---
 drivers/devfreq/devfreq.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 98657d3b9435..2810c84b9f8a 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -152,11 +152,8 @@ void devfreq_get_freq_range(struct devfreq *devfreq,
 				(unsigned long)HZ_PER_KHZ * qos_max_freq);
 
 	/* Apply constraints from OPP interface */
-	*min_freq = max(*min_freq, devfreq->scaling_min_freq);
-	*max_freq = min(*max_freq, devfreq->scaling_max_freq);
-
-	if (*min_freq > *max_freq)
-		*min_freq = *max_freq;
+	*max_freq = clamp(*max_freq, devfreq->scaling_min_freq, devfreq->scaling_max_freq);
+	*min_freq = clamp(*min_freq, devfreq->scaling_min_freq, *max_freq);
 }
 EXPORT_SYMBOL(devfreq_get_freq_range);
 
-- 
2.33.0