From: WooYoung Jeon <chococookieman1@gmail.com>
To: Andy Shevchenko <andy@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org,
linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org,
WooYoung Jeon <chococookieman1@gmail.com>
Subject: [PATCH] staging: fbtft: replace udelay with usleep_range
Date: Thu, 15 Jan 2026 17:40:19 +0900 [thread overview]
Message-ID: <20260115084019.28574-1-chococookieman1@gmail.com> (raw)
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@gmail.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
next reply other threads:[~2026-01-15 8:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-15 8:40 WooYoung Jeon [this message]
2026-01-15 8:47 ` [PATCH] staging: fbtft: replace udelay with usleep_range Andy Shevchenko
2026-01-15 8:59 ` Greg Kroah-Hartman
-- strict thread matches above, loose matches on Subject: below --
2022-07-09 10:06 Christos Kollintzas
2022-07-09 10:30 ` Greg KH
2022-07-10 13:00 ` Christos Kollintzas
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