linux-kernel - [PATCH] staging: fbtft: replace udelay with usleep

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Message-ID: <20260115084019.28574-1-chococookieman1@gmail.com>
Date: Thu, 15 Jan 2026 17:40:19 +0900
From: WooYoung Jeon <chococookieman1@...il.com>
To: Andy Shevchenko <andy@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: dri-devel@...ts.freedesktop.org,
	linux-fbdev@...r.kernel.org,
	linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	WooYoung Jeon <chococookieman1@...il.com>
Subject: [PATCH] staging: fbtft: replace udelay with usleep_range

In the fb_ra8875 driver, udelay(100) is used for delay which
causes busy-waiting. Replacing it with usleep_range(100, 120)
allows the CPU to sleep during the delay, improving system
resource efficiency.

This change was suggested by checkpatch.pl.

Signed-off-by: WooYoung Jeon <chococookieman1@...il.com>
---
 drivers/staging/fbtft/fb_ra8875.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/fbtft/fb_ra8875.c b/drivers/staging/fbtft/fb_ra8875.c
index 0ab1de664..92c9e4e03 100644
--- a/drivers/staging/fbtft/fb_ra8875.c
+++ b/drivers/staging/fbtft/fb_ra8875.c
@@ -210,7 +210,7 @@ static void write_reg8_bus8(struct fbtft_par *par, int len, ...)
 	}
 	len--;
 
-	udelay(100);
+	usleep_range(100, 120);
 
 	if (len) {
 		buf = (u8 *)par->buf;
-- 
2.43.0