Re: [PATCH] staging: fbtft: replace udelay with usleep_range

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Thu, Jan 15, 2026 at 05:40:19PM +0900, WooYoung Jeon wrote:
> 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
> 

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
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created.  Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
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