linux-kernel - Re: [PATCH] staging: fbtft: fb_ra8875: replace udelay with usleep

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Message-ID: <CAHp75VeWGAyzAFBYSQS7FGpU1eSRo1Egrh44hUpXJgYZhFEkwg@mail.gmail.com>
Date: Tue, 21 Oct 2025 11:50:11 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Olle Lukowski <olle@...owski.dev>
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: fb_ra8875: replace udelay with usleep_range

On Mon, Oct 20, 2025 at 10:16 PM Olle Lukowski <olle@...owski.dev> wrote:
>
> Replace udelay(100) calls with usleep_range(100, 200) to allow the
> scheduler to yield instead of busy-waiting. This is the preferred API for
> sleep durations above 10 microseconds.

...

> -       udelay(100);
> +       usleep_range(100, 200);

Besides what Greg said, the function in similar changes should be
fsleep(), it will automatically choose the best low-level API for the
given delay.

-- 
With Best Regards,
Andy Shevchenko