linux-kernel - Re: [PATCH v2 0/3] led: ledtrig-transient: add support for hrtimer

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Date:   Wed, 13 Sep 2017 22:20:32 +0200
From:   Pavel Machek <pavel@....cz>
To:     David Lin <dtwlin@...gle.com>
Cc:     corbet@....net, rpurdie@...ys.net, jacek.anaszewski@...il.com,
        hdegoede@...hat.com, gregkh@...uxfoundation.org, robh@...nel.org,
        romlem@...gle.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH v2 0/3] led: ledtrig-transient: add support for hrtimer

Hi!

> These patch series add the LED_BRIGHTNESS_FAST flag support for
> ledtrig-transient to use hrtimer so that platforms with high-resolution timer
> support can have better accuracy in the trigger duration timing. The need for
> this support is driven by the fact that Android has removed the timed_ouput [1]
> and is now using led-trigger for handling vibrator control which requires the
> timer to be accurate up to a millisecond. However, this flag support would also
> allow hrtimer to co-exist with the ktimer without causing warning to the
> existing drivers [2].

NAK.

LEDs do not need extra overhead, and vibrator control should not go
through LED subsystem.

Input subsystem includes support for vibrations and force
feedback. Please use that instead.

									Pavel

> David Lin (3):
>   leds: Replace flags bit shift with BIT() macros
>   leds: Add the LED_BRIGHTNESS_FAST flag
>   led: ledtrig-transient: add support for hrtimer
> 
>  Documentation/leds/leds-class.txt        |  5 +++
>  drivers/leds/trigger/ledtrig-transient.c | 59 +++++++++++++++++++++++++++++---
>  include/linux/leds.h                     | 19 +++++-----
>  3 files changed, 69 insertions(+), 14 deletions(-)
> 

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

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