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Perez de Azpillaga" To: andy@kernel.org, gregkh@linuxfoundation.org Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org, azpijr@gmail.com Subject: [PATCH] staging: fbtft: fb_ra8875: replace udelays with usleep_range Date: Wed, 25 Feb 2026 21:45:59 +0100 Message-ID: <20260225204602.134218-1-azpijr@gmail.com> X-Mailer: git-send-email 2.53.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Thu, 26 Feb 2026 18:11:59 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The write_reg8_bus8 function uses udelay(100) twice to wait for the display controller. For delays of this duration in non-atomic context, usleep_range() is preferred as it avoids busy-waiting. Update both instances to use usleep_range(100, 120), allowing the scheduler to utilize the CPU during these wait periods. Signed-off-by: Jose A. Perez de Azpillaga --- drivers/staging/fbtft/fb_ra8875.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/staging/fbtft/fb_ra8875.c b/drivers/staging/fbtft/fb_ra8875.c index 0ab1de6647d0..6058934e2ca2 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; @@ -231,7 +231,7 @@ static void write_reg8_bus8(struct fbtft_par *par, int len, ...) /* restore user spi-speed */ par->fbtftops.write = fbtft_write_spi; - udelay(100); + usleep_range(100, 120); } static int write_vmem16_bus8(struct fbtft_par *par, size_t offset, size_t len) -- 2.53.0