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

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Message-ID: <aWipkPM0pwqx3red@smile.fi.intel.com>
Date: Thu, 15 Jan 2026 10:47:12 +0200
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: WooYoung Jeon <chococookieman1@...il.com>
Cc: Andy Shevchenko <andy@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
	linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: fbtft: replace udelay with usleep_range

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.

Without HW test it's no go. See the previous attempts to "fix" the same place
over and over. (https://lore.kernel.org/ is at your service to dive into mail
archives)

-- 
With Best Regards,
Andy Shevchenko