From: Heiko Stuebner <heiko@sntech.de>
To: Matthias Kaehlcke <mka@chromium.org>
Cc: Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Douglas Anderson <dianders@chromium.org>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-rockchip@lists.infradead.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2] ARM: dts: rockchip: Use interpolated brightness tables for veyron
Date: Thu, 10 Oct 2019 23:23:48 +0200 [thread overview]
Message-ID: <3947291.Wl2KGcTfji@phil> (raw)
In-Reply-To: <20191003094137.v2.1.Ic9fd698810ea569c465350154da40b85d24f805b@changeid>
Am Donnerstag, 3. Oktober 2019, 18:41:52 CEST schrieb Matthias Kaehlcke:
> Use interpolated brightness tables (added by commit 573fe6d1c25
> ("backlight: pwm_bl: Linear interpolation between
> brightness-levels") for veyron, instead of specifying every single
> step. Some devices/panels have intervals that are smaller than
> the specified 'num-interpolated-steps', the driver interprets
> these intervals as a single step.
>
> Another option would be to switch to a perceptual brightness curve
> (CIE 1931), with the caveat that it would change the behavior of
> the backlight. Also the concept of a minimum brightness level is
> currently not supported for CIE 1931 curves.
>
> Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
applied for 5.5
Thanks
Heiko
WARNING: multiple messages have this Message-ID (diff)
From: Heiko Stuebner <heiko@sntech.de>
To: Matthias Kaehlcke <mka@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
devicetree@vger.kernel.org,
Douglas Anderson <dianders@chromium.org>,
linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org,
Rob Herring <robh+dt@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2] ARM: dts: rockchip: Use interpolated brightness tables for veyron
Date: Thu, 10 Oct 2019 23:23:48 +0200 [thread overview]
Message-ID: <3947291.Wl2KGcTfji@phil> (raw)
In-Reply-To: <20191003094137.v2.1.Ic9fd698810ea569c465350154da40b85d24f805b@changeid>
Am Donnerstag, 3. Oktober 2019, 18:41:52 CEST schrieb Matthias Kaehlcke:
> Use interpolated brightness tables (added by commit 573fe6d1c25
> ("backlight: pwm_bl: Linear interpolation between
> brightness-levels") for veyron, instead of specifying every single
> step. Some devices/panels have intervals that are smaller than
> the specified 'num-interpolated-steps', the driver interprets
> these intervals as a single step.
>
> Another option would be to switch to a perceptual brightness curve
> (CIE 1931), with the caveat that it would change the behavior of
> the backlight. Also the concept of a minimum brightness level is
> currently not supported for CIE 1931 curves.
>
> Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
applied for 5.5
Thanks
Heiko
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next prev parent reply other threads:[~2019-10-10 21:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-03 16:41 [PATCH v2] ARM: dts: rockchip: Use interpolated brightness tables for veyron Matthias Kaehlcke
2019-10-03 16:41 ` Matthias Kaehlcke
2019-10-03 16:41 ` Matthias Kaehlcke
2019-10-08 18:05 ` Doug Anderson
2019-10-08 18:05 ` Doug Anderson
2019-10-10 21:23 ` Heiko Stuebner [this message]
2019-10-10 21:23 ` Heiko Stuebner
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