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Re: [PATCH RFC] [media] s5k6aa: set usleep_range greater 0

From Sakari Ailus <sakari.ailus@iki.fi>
Newsgroups linux.kernel
Subject Re: [PATCH RFC] [media] s5k6aa: set usleep_range greater 0
Date 2016-12-13 10:50 +0100
Message-ID <sNRSF-7Zv-7@gated-at.bofh.it> (permalink)
References <sNKxP-3oy-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Hi Nicholas,

On Tue, Dec 13, 2016 at 02:58:02AM +0100, Nicholas Mc Guire wrote:
> As this is not in atomic context and it does not seem like a critical 
> timing setting a range of 1ms allows the timer subsystem to optimize 
> the hrtimer here.

I'd suggest not to. These delays are often directly visible to the user in
use cases where attention is indeed paid to milliseconds.

The same applies to register accesses. An delay of 0 to 100 µs isn't much as
such, but when you multiply that with the number of accesses it begins to
add up.

-- 
Kind regards,

Sakari Ailus
e-mail: sakari.ailus@iki.fi	XMPP: sailus@retiisi.org.uk

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Thread

[PATCH RFC] [media] s5k6aa: set usleep_range greater 0 Nicholas Mc Guire <hofrat@osadl.org> - 2016-12-13 03:00 +0100
  Re: [PATCH RFC] [media] s5k6aa: set usleep_range greater 0 Sakari Ailus <sakari.ailus@iki.fi> - 2016-12-13 10:50 +0100
    Re: [PATCH RFC] [media] s5k6aa: set usleep_range greater 0 Ian Arkver <ian.arkver.dev@gmail.com> - 2016-12-13 11:20 +0100
      Re: [PATCH RFC] [media] s5k6aa: set usleep_range greater 0 Sakari Ailus <sakari.ailus@iki.fi> - 2016-12-13 12:00 +0100
  Re: [PATCH RFC] [media] s5k6aa: set usleep_range greater 0 Sylwester Nawrocki <s.nawrocki@samsung.com> - 2016-12-13 13:40 +0100
    Re: [PATCH RFC] [media] s5k6aa: set usleep_range greater 0 Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2016-12-13 15:10 +0100
      Re: [PATCH RFC] [media] s5k6aa: set usleep_range greater 0 Sylwester Nawrocki <s.nawrocki@samsung.com> - 2016-12-13 16:00 +0100
        Re: [PATCH RFC] [media] s5k6aa: set usleep_range greater 0 Nicholas Mc Guire <der.herr@hofr.at> - 2016-12-15 02:20 +0100
          Re: [PATCH RFC] [media] s5k6aa: set usleep_range greater 0 Sylwester Nawrocki <s.nawrocki@samsung.com> - 2016-12-15 18:50 +0100

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