linux-kernel - [PATCH] drm/radeon: replace min/max nesting with clamp()

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Message-Id: <20250812031603.463355-1-zhao.xichao@vivo.com>
Date: Tue, 12 Aug 2025 11:16:03 +0800
From: Xichao Zhao <zhao.xichao@...o.com>
To: alexander.deucher@....com,
	christian.koenig@....com,
	airlied@...il.com,
	simona@...ll.ch
Cc: amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Xichao Zhao <zhao.xichao@...o.com>
Subject: [PATCH] drm/radeon: replace min/max nesting with clamp()

The clamp() macro explicitly expresses the intent of constraining
a value within bounds.Therefore, replacing min(max(a, b), c) and
max(min(a,b),c) with clamp(val, lo, hi) can improve code readability.

Signed-off-by: Xichao Zhao <zhao.xichao@...o.com>
---
 drivers/gpu/drm/radeon/radeon_display.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index b4bf5dfeea2d..d66c1a30df95 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -926,10 +926,10 @@ static void avivo_get_fb_ref_div(unsigned nom, unsigned den, unsigned post_div,
 				 unsigned *fb_div, unsigned *ref_div)
 {
 	/* limit reference * post divider to a maximum */
-	ref_div_max = max(min(100 / post_div, ref_div_max), 1u);
+	ref_div_max = clamp(100 / post_div, 1u, ref_div_max);
 
 	/* get matching reference and feedback divider */
-	*ref_div = min(max(den/post_div, 1u), ref_div_max);
+	*ref_div = clamp(den / post_div, 1u, ref_div_max);
 	*fb_div = DIV_ROUND_CLOSEST(nom * *ref_div * post_div, den);
 
 	/* limit fb divider to its maximum */
-- 
2.34.1