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From: Alexandru M Stan <amstan@chromium.org>
To: Daniel Thompson <daniel.thompson@linaro.org>
Cc: devicetree@vger.kernel.org,
	"Douglas Anderson" <dianders@chromium.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	"Heiko Stuebner" <heiko@sntech.de>,
	"Bartlomiej Zolnierkiewicz" <b.zolnierkie@samsung.com>,
	"Jingoo Han" <jingoohan1@gmail.com>,
	"Andy Gross" <agross@kernel.org>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Bjorn Andersson" <bjorn.andersson@linaro.org>,
	"open list:ARM/Rockchip SoC..."
	<linux-rockchip@lists.infradead.org>,
	"Thierry Reding" <thierry.reding@gmail.com>,
	"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
	"Enric Balletbo i Serra" <enric.balletbo@collabora.com>,
	"Lee Jones" <lee.jones@linaro.org>,
	"Matthias Kaehlcke" <mka@chromium.org>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 2/3] ARM: dts: rockchip: veyron: Remove 0 point from brightness-levels
Date: Thu, 15 Oct 2020 14:29:05 -0700
Message-ID: <CAHNYxRx3J7XUE-hWa8-6_bOePsw1oeY9uuuehy=yCxN2RyqsjQ@mail.gmail.com> (raw)
In-Reply-To: <20201014141946.mkrvpkrttucffkhj@holly.lan>

On Wed, Oct 14, 2020 at 7:19 AM Daniel Thompson
<daniel.thompson@linaro.org> wrote:
>
> On Tue, Oct 13, 2020 at 01:01:02AM -0700, Alexandru Stan wrote:
> > After the "PWM backlight interpolation adjustments" patches, the
> > backlight interpolation works a little differently. The way these
> > dts files were working before was relying on a bug (IMHO).
> >
> > Remove the 0-3 range since otherwise we would have a 252 long
> > interpolation that would slowly go between 0 and 3, looking really bad
> > in userspace.
> >
> > We don't need the 0% point, userspace seems to handle this just fine
> > because it uses the bl_power property to turn off the display.
> >
> > Signed-off-by: Alexandru Stan <amstan@chromium.org>
>
> Acked-by: Daniel Thompson <daniel.thompson@linaro.org>

Thank you!

>
> Note also shouldn't this be patch 1 of the set. AFAICT it makes sense
> whether or not the interpolation algorithm is changed.

Yeah, I guess it could be. Sorry I didn't think of it that way before,
I'm used to landing things in a group.

In particular on veyron I assume it will almost be a noop without
having my driver patch (especially with the findings of 0% not being
that important).

Feel free to land this independently.

>
>
> Daniel.

Alexandru Stan (amstan)

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Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-13  8:01 [PATCH v2 0/3] PWM backlight interpolation adjustments Alexandru Stan
2020-10-13  8:01 ` [PATCH v2 2/3] ARM: dts: rockchip: veyron: Remove 0 point from brightness-levels Alexandru Stan
2020-10-14 14:19   ` Daniel Thompson
2020-10-15 21:29     ` Alexandru M Stan [this message]

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