From: Pavel Machek <pavel@ucw.cz>
To: Ondrej Jirman <megous@megous.com>
Cc: devicetree@vger.kernel.org, Samuel Holland <samuel@sholland.org>,
David Airlie <airlied@linux.ie>,
Linus Walleij <linus.walleij@linaro.org>,
Bhushan Shah <bshah@kde.org>, Chen-Yu Tsai <wens@csie.org>,
Maxime Ripard <mripard@kernel.org>,
linux-kernel@vger.kernel.org, Martijn Braam <martijn@brixit.nl>,
linux-sunxi@googlegroups.com, Rob Herring <robh+dt@kernel.org>,
Thierry Reding <thierry.reding@gmail.com>,
dri-devel@lists.freedesktop.org, Daniel Vetter <daniel@ffwll.ch>,
Sam Ravnborg <sam@ravnborg.org>, Luca Weiss <luca@z3ntu.xyz>,
linux-arm-kernel@lists.infradead.org,
Icenowy Zheng <icenowy@aosc.io>
Subject: Re: [PATCH v3 4/5] arm64: dts: sun50i-a64-pinephone: Enable LCD support on PinePhone
Date: Fri, 29 May 2020 18:27:28 +0200 [thread overview]
Message-ID: <20200529162728.GB3709@amd> (raw)
In-Reply-To: <20200513212451.1919013-5-megous@megous.com>
[-- Attachment #1.1: Type: text/plain, Size: 1265 bytes --]
Hi!
> PinePhone uses PWM backlight and a XBD599 LCD panel over DSI for
> display.
>
> Backlight levels curve was optimized by Martijn Braam using a
> lux meter.
If it was possible to preserve lux values for individual settings in
the comment somewhere... that would be nice :-).
One day, it would be nice to have brightness settings in lux, so I
could easily set matching levels on multiple devices, for example...
Best regards,
Pavel
> +
> +&backlight {
> + power-supply = <®_ldo_io0>;
> + /*
> + * PWM backlight circuit on this PinePhone revision was changed since
> + * 1.0, and the lowest PWM duty cycle that doesn't lead to backlight
> + * being off is around 20%. Duty cycle for the lowest brightness level
> + * also varries quite a bit between individual boards, so the lowest
> + * value here was chosen as a safe default.
> + */
> + brightness-levels = <
> + 774 793 814 842
> + 882 935 1003 1088
> + 1192 1316 1462 1633
> + 1830 2054 2309 2596
> + 2916 3271 3664 4096>;
> + num-interpolated-steps = <50>;
> + default-brightness-level = <400>;
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
[-- Attachment #1.2: Digital signature --]
[-- Type: application/pgp-signature, Size: 181 bytes --]
[-- Attachment #2: Type: text/plain, Size: 176 bytes --]
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-05-29 16:27 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-13 21:24 [PATCH v3 0/5] Add support for PinePhone LCD panel Ondrej Jirman
2020-05-13 21:24 ` [PATCH v3 1/5] dt-bindings: vendor-prefixes: Add Xingbangda Ondrej Jirman
2020-05-28 2:40 ` Rob Herring
2020-05-13 21:24 ` [PATCH v3 2/5] dt-bindings: panel: Add binding for Xingbangda XBD599 panel Ondrej Jirman
2020-05-26 11:22 ` Linus Walleij
2020-05-28 2:41 ` Rob Herring
2020-05-13 21:24 ` [PATCH v3 3/5] drm: panel: Add Xingbangda XBD599 panel (ST7703 controller) Ondrej Jirman
2020-05-26 11:32 ` Linus Walleij
2020-06-17 2:00 ` [linux-sunxi] " Ondřej Jirman
2020-05-28 3:31 ` Samuel Holland
2020-05-13 21:24 ` [PATCH v3 4/5] arm64: dts: sun50i-a64-pinephone: Enable LCD support on PinePhone Ondrej Jirman
2020-05-29 16:27 ` Pavel Machek [this message]
2020-05-13 21:24 ` [PATCH v3 5/5] arm64: dts: sun50i-a64-pinephone: Add touchscreen support Ondrej Jirman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200529162728.GB3709@amd \
--to=pavel@ucw.cz \
--cc=airlied@linux.ie \
--cc=bshah@kde.org \
--cc=daniel@ffwll.ch \
--cc=devicetree@vger.kernel.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=icenowy@aosc.io \
--cc=linus.walleij@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-sunxi@googlegroups.com \
--cc=luca@z3ntu.xyz \
--cc=martijn@brixit.nl \
--cc=megous@megous.com \
--cc=mripard@kernel.org \
--cc=robh+dt@kernel.org \
--cc=sam@ravnborg.org \
--cc=samuel@sholland.org \
--cc=thierry.reding@gmail.com \
--cc=wens@csie.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).