linux-kernel - Re: [PATCH 01/20] leds: implement LED_BRIGHTNESS

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Message-ID: <556C6E2F.7050100@list.ru>
Date:	Mon, 01 Jun 2015 17:37:35 +0300
From:	Stas Sergeev <stsp@...t.ru>
To:	Jacek Anaszewski <j.anaszewski@...sung.com>
CC:	linux-leds@...r.kernel.org,
	Linux kernel <linux-kernel@...r.kernel.org>,
	Stas Sergeev <stsp@...rs.sourceforge.net>,
	Bryan Wu <cooloney@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH 01/20] leds: implement LED_BRIGHTNESS_FAST flag

01.06.2015 17:19, Jacek Anaszewski пишет:
>> In fact, the things are more complicated: some drivers do small
>> udelay()'s but do not use a work-queue. I was not marking them as
>> FAST, although perhaps they could still be marked as SYNC?
> This could be handled by adding a property to struct led_classdev
> for defining minimum acceptable delay. Then FAST flag should not
> be needed.
Oh c'mon, that's too difficult!
Lets just have a flag whether we can do an SW PWM from hrtimer irq callback.
If we can't do from irq callback - simply do not do anything below 10mS.
IMHO a simple and practical solution.
Otherwise we'll not have anything implemented at all I guess.
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