Re: [PATCH v2 0/3] led: ledtrig-transient: add support for hrtimer
- Date: Wed, 13 Sep 2017 14:20:58 -0700
- From: David Lin <dtwlin@xxxxxxxxxx>
- Subject: Re: [PATCH v2 0/3] led: ledtrig-transient: add support for hrtimer
On Wed, Sep 13, 2017 at 1:20 PM, Pavel Machek <pavel@xxxxxx> wrote:
> > 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 
> > 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 .
> 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.
I thought we are already over this discussion. As of now, the support
of vibrator through ledtrig is documented
(Documentation/leds/ledtrig-transient.txt) and there are users using