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From: Daniel Thompson <daniel.thompson@linaro.org>
To: Alexandru Stan <amstan@chromium.org>
Cc: devicetree@vger.kernel.org,
	"Douglas Anderson" <dianders@chromium.org>,
	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>,
	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: Wed, 14 Oct 2020 15:19:46 +0100
Message-ID: <20201014141946.mkrvpkrttucffkhj@holly.lan> (raw)
In-Reply-To: <20201013010056.v2.2.I96b8d872ec51171f19274e43e96cadc092881271@changeid>

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>

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


Daniel.

> ---
> 
>  arch/arm/boot/dts/rk3288-veyron-jaq.dts    | 2 +-
>  arch/arm/boot/dts/rk3288-veyron-minnie.dts | 2 +-
>  arch/arm/boot/dts/rk3288-veyron-tiger.dts  | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/rk3288-veyron-jaq.dts b/arch/arm/boot/dts/rk3288-veyron-jaq.dts
> index af77ab20586d..4a148cf1defc 100644
> --- a/arch/arm/boot/dts/rk3288-veyron-jaq.dts
> +++ b/arch/arm/boot/dts/rk3288-veyron-jaq.dts
> @@ -20,7 +20,7 @@ / {
>  
>  &backlight {
>  	/* Jaq panel PWM must be >= 3%, so start non-zero brightness at 8 */
> -	brightness-levels = <0 8 255>;
> +	brightness-levels = <8 255>;
>  	num-interpolated-steps = <247>;
>  };
>  
> diff --git a/arch/arm/boot/dts/rk3288-veyron-minnie.dts b/arch/arm/boot/dts/rk3288-veyron-minnie.dts
> index f8b69e0a16a0..82fc6fba9999 100644
> --- a/arch/arm/boot/dts/rk3288-veyron-minnie.dts
> +++ b/arch/arm/boot/dts/rk3288-veyron-minnie.dts
> @@ -39,7 +39,7 @@ volum_up {
>  
>  &backlight {
>  	/* Minnie panel PWM must be >= 1%, so start non-zero brightness at 3 */
> -	brightness-levels = <0 3 255>;
> +	brightness-levels = <3 255>;
>  	num-interpolated-steps = <252>;
>  };
>  
> diff --git a/arch/arm/boot/dts/rk3288-veyron-tiger.dts b/arch/arm/boot/dts/rk3288-veyron-tiger.dts
> index 069f0c2c1fdf..52a84cbe7a90 100644
> --- a/arch/arm/boot/dts/rk3288-veyron-tiger.dts
> +++ b/arch/arm/boot/dts/rk3288-veyron-tiger.dts
> @@ -23,7 +23,7 @@ / {
>  
>  &backlight {
>  	/* Tiger panel PWM must be >= 1%, so start non-zero brightness at 3 */
> -	brightness-levels = <0 3 255>;
> +	brightness-levels = <3 255>;
>  	num-interpolated-steps = <252>;
>  };
>  
> -- 
> 2.28.0
> 

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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 [this message]
2020-10-15 21:29     ` Alexandru M Stan

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