linux-kernel - Re: [PATCH 4.19 014/639] leds: tlc591xx: update the maximum brightness

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Message-ID: <20200124231826.GA14064@duo.ucw.cz>
Date:   Sat, 25 Jan 2020 00:18:26 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Jean-Jacques Hiblot <jjhiblot@...com>
Subject: Re: [PATCH 4.19 014/639] leds: tlc591xx: update the maximum
 brightness

On Fri 2020-01-24 10:23:04, Greg Kroah-Hartman wrote:
> From: Jean-Jacques Hiblot <jjhiblot@...com>
> 
> commit a2cafdfd8cf5ad8adda6c0ce44a59f46431edf02 upstream.
> 
> The TLC chips actually offer 257 levels:
> - 0: led OFF
> - 1-255: Led dimmed is using a PWM. The duty cycle range from 0.4% to 99.6%
> - 256: led fully ON
> 
> Fixes: e370d010a5fe ("leds: tlc591xx: Driver for the TI 8/16 Channel i2c LED driver")
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...com>
> Signed-off-by: Pavel Machek <pavel@....cz>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Its a new feature, really and quite unusual one: 257 brightness levels
is not usual. It is theoretically safe, but...

Lets not do that for -stable.

(I'm a LED maintainer).

Best regards,
								Pavel

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

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