From: Pavel Machek <pavel@ucw.cz>
To: josh@joshtriplett.org
Cc: "ksummit-discuss@lists.linuxfoundation.org"
<ksummit-discuss@lists.linuxfoundation.org>,
riverful.kim@samsung.com, kyungmin.park@samsung.com,
John Stultz <john.stultz@linaro.org>,
Bjorn Andersson <Bjorn.Andersson@sonymobile.com>
Subject: Re: [Ksummit-discuss] [CORE TOPIC] Mainline kernel on a cellphone
Date: Thu, 23 Jul 2015 23:29:56 +0200 [thread overview]
Message-ID: <20150723212956.GB25053@amd> (raw)
In-Reply-To: <20150723210018.GA2077@cloud>
On Thu 2015-07-23 14:00:18, josh@joshtriplett.org wrote:
> On Thu, Jul 23, 2015 at 10:29:02PM +0200, Pavel Machek wrote:
> > Questions I had in mind:
> >
> > 1) RGB leds. They are not same as 3 leds. Plus there' hw acceleration
> > on them. How to support them?
>
> Seems like internally we should treat them as 3 LEDs, but the interface
> to userspace or to the LED trigger mechanism should group the three
> brightness values together rather than handling them separately.
Yes. It should me "make it show magenta" not "set red to x, blue to y,
green to z"...
> Is the hardware acceleration something more than PWM?
Yes. It can do quite complex patterns autonomously. "Blink red three
times, then slowly go to full brightness and back". It can do as
complex stuff as blink n times, then delay, for n is prime
number.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2015-07-23 21:29 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-23 10:57 Pavel Machek
2015-07-23 11:21 ` Linus Walleij
2015-07-23 12:14 ` Pavel Machek
2015-07-23 12:42 ` Steven Rostedt
2015-07-23 15:40 ` Mark Brown
2015-07-28 22:09 ` Tim Bird
2015-07-28 23:07 ` Bjorn Andersson
2015-07-31 16:18 ` Rob Herring
2015-07-31 16:56 ` Bjorn Andersson
2015-08-11 9:34 ` Johannes Berg
2015-07-31 17:25 ` Tim Bird
2015-08-03 15:29 ` John W. Linville
2015-08-03 7:42 ` Linus Walleij
2015-08-03 21:34 ` Rob Herring
2015-08-03 22:36 ` Marcel Holtmann
2015-08-05 8:40 ` Linus Walleij
2015-08-05 8:46 ` Linus Walleij
2015-08-05 9:11 ` Samuel Ortiz
2015-08-05 11:54 ` Pavel Machek
2015-08-05 9:09 ` Samuel Ortiz
2015-08-05 17:19 ` Marcel Holtmann
2015-08-05 16:02 ` Rob Herring
2015-08-05 17:00 ` Marcel Holtmann
2015-08-07 12:40 ` Linus Walleij
2015-07-29 0:45 ` Krzysztof Kozlowski
2015-07-29 6:12 ` Laurent Pinchart
2015-07-29 7:40 ` Pavel Machek
2015-08-25 18:59 ` Tim Bird
2015-08-26 1:22 ` Krzysztof Kozlowski
2015-08-26 4:25 ` Sudip Mukherjee
2015-08-26 4:52 ` Krzysztof Kozlowski
2015-08-26 5:30 ` Laurent Pinchart
2015-08-26 5:33 ` Krzysztof Kozlowski
2015-08-26 6:15 ` Josh Triplett
2015-08-26 7:23 ` Heiko Stuebner
2015-08-26 8:05 ` Krzysztof Kozlowski
2015-08-28 8:20 ` Nicolas Ferre
2015-08-26 11:33 ` Mark Brown
2015-08-26 12:56 ` Jason Cooper
2015-08-26 13:35 ` Geert Uytterhoeven
2015-08-26 13:58 ` Sudip Mukherjee
2015-08-26 14:51 ` Jason Cooper
2015-08-26 17:13 ` Sudip Mukherjee
2015-08-26 20:09 ` Greg Kroah-Hartman
2015-08-28 7:44 ` Pavel Machek
2015-08-28 8:42 ` Heiko Stuebner
2015-08-29 15:47 ` Sudip Mukherjee
2015-07-29 8:18 ` Heiko Stübner
2015-07-29 0:56 ` Rafael J. Wysocki
2015-07-29 6:43 ` Daniel Vetter
2015-07-29 17:42 ` Tim Bird
2015-07-29 7:14 ` Bintian
2015-07-29 18:07 ` Tim Bird
2015-07-31 1:50 ` Bintian
2015-07-23 20:29 ` Pavel Machek
2015-07-23 20:34 ` Pavel Machek
2015-07-24 4:34 ` NeilBrown
2015-07-24 6:00 ` Tony Lindgren
2015-07-24 22:26 ` Rafael J. Wysocki
2015-07-28 22:03 ` NeilBrown
2015-07-29 0:51 ` Rafael J. Wysocki
2015-07-29 23:23 ` Rafael J. Wysocki
2015-07-29 23:59 ` NeilBrown
2015-07-30 0:57 ` Rafael J. Wysocki
2015-07-31 17:55 ` Mark Brown
2015-08-01 0:08 ` Rafael J. Wysocki
2015-07-23 21:00 ` josh
2015-07-23 21:29 ` Pavel Machek [this message]
2015-07-29 13:32 ` Mark Brown
2015-07-31 12:22 ` Pavel Machek
2015-07-31 17:52 ` Mark Brown
2015-07-31 22:03 ` Pavel Machek
2015-08-01 10:55 ` Mark Brown
2015-08-01 19:03 ` Pavel Machek
2015-08-04 17:17 ` Mark Brown
2015-08-03 5:33 ` Tony Lindgren
2015-07-23 13:23 ` Krzysztof Kozlowski
2015-07-23 21:56 ` Pavel Machek
2015-07-24 1:37 ` Krzysztof Kozlowski
2015-07-24 4:40 ` Kyungmin Park
2015-07-23 14:48 ` Shuah Khan
2015-07-23 15:08 ` Heiko Stübner
2015-08-04 19:39 ` Pavel Machek
2015-08-05 7:05 ` Bintian
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