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([121.125.189.206]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a3e3c48be5sm248390095ad.30.2026.01.15.00.40.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Jan 2026 00:40:26 -0800 (PST) From: WooYoung Jeon To: Andy Shevchenko , Greg Kroah-Hartman Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org, WooYoung Jeon Subject: [PATCH] staging: fbtft: replace udelay with usleep_range Date: Thu, 15 Jan 2026 17:40:19 +0900 Message-ID: <20260115084019.28574-1-chococookieman1@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 --- 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_r= a8875.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--; =20 - udelay(100); + usleep_range(100, 120); =20 if (len) { buf =3D (u8 *)par->buf; --=20 2.43.0