linux-kernel - Re: [PATCH] led: ledtrig-transient: replace timer

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Date:   Mon, 24 Apr 2017 09:44:17 +0200
From:   Pavel Machek <pavel@....cz>
To:     David Lin <dtwlin@...gle.com>
Cc:     rpurdie@...ys.net, jacek.anaszewski@...il.com, robh@...nel.org,
        romlem@...gle.com, joelaf@...gle.com, stable@...r.kernel.org,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] led: ledtrig-transient: replace timer_list with hrtimer

On Sun 2017-04-23 21:42:54, David Lin wrote:
> This patch replaces the kernel timer used by led transient trigger as an
> one-shot timer with an hrtimer. As Android is moving away from the
> obsoleted timed_output to ledtrig-transient for the vibrator HAL,
> ledtrig-transient needs to be able to handle the "duration" property to
> millisecond precision as modern haptic actuators can be driven in
> precisely one cycle (~1 ms) in order to provide a crisp and subtle
> feedback.

(Insert rant about using LED subsystem for something that is not a
LED; if we are going to these subtleties, LEDs _do_ have  different
properties than vibration motor...).

Otherwise it looks good.

Acked-by: Pavel Machek <pavel@....cz>
								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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