Re: [Outreachy kernel] [PATCH] Staging: fbtft: Replace udelay to usleep_range

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

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http://daringfireball.net/2007/07/on_top

On Sun, Mar 03, 2019 at 07:46:55PM +0530, Bhagyashri Dighole wrote:
> Hi,
> I have gone through "Documentation/timers/timers-howto.txt", It is
> mentioned that we can put 10us-20us gap between min_range and max_range. In
> above situation `udelay(20)` our min_range is 20 and max_range is 30.

That type of delay range can be set, yes, but what are you helping here?
Also, can the hardware really support this type of longer delay?  Some
hardware types can not as it is trying to rely on some sort of
semi-regular delays.  Or could the delay be shorter?  It's really hard
to know without knowing what the hardware is expecting and being able to
test it.

thanks,

greg k-h