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From: Shawn Guo <shawn.guo@linaro.org>
To: Robby Cai <r63905@freescale.com>
Cc: linux-pwm@vger.kernel.org, jg1.han@samsung.com,
	lee.jones@linaro.org, thierry.reding@gmail.com,
	linux-arm-kernel@lists.infradead.org,
	Tim Harvey <tharvey@gateworks.com>,
	Eric Nelson <eric.nelson@boundarydevices.com>,
	Troy Kisky <troy.kisky@boundarydevices.com>,
	kernel@pengutronix.de
Subject: Re: [PATCH] ARM: dts: imx6qdl: Adjust the brightness setting for LVDS panel
Date: Tue, 20 Jan 2015 19:38:39 +0800	[thread overview]
Message-ID: <20150120113837.GC2766@dragon> (raw)
In-Reply-To: <1421749355-23050-1-git-send-email-r63905@freescale.com>

Add LAKML and a few interested people.

Shawn

On Tue, Jan 20, 2015 at 06:22:35PM +0800, Robby Cai wrote:
> Hannstar XGA panel is used by default on i.MX6QDL Sabre Auto/Lite/SD
> or derived board.
> 
> According to its data sheet [1],
> a) the dimming duty cycle is 20% - 100%.
> This patch changes the brightness-level from 20 to 100 with step 10 to
> make it straight-forward.
> b) the typical dimming frequency is 20KHz.
> The previous setting is 200Hz. This patch corrects it.
> 
> [1]
> http://boundarydevices.com/wp-content/uploads/2013/06/HSD100PXN1-A00-C11-1.0.pdf
> 
> Signed-off-by: Robby Cai <r63905@freescale.com>
> ---
>  arch/arm/boot/dts/imx6qdl-gw52xx.dtsi     | 6 +++---
>  arch/arm/boot/dts/imx6qdl-gw53xx.dtsi     | 6 +++---
>  arch/arm/boot/dts/imx6qdl-gw54xx.dtsi     | 6 +++---
>  arch/arm/boot/dts/imx6qdl-nitrogen6x.dtsi | 6 +++---
>  arch/arm/boot/dts/imx6qdl-sabreauto.dtsi  | 6 +++---
>  arch/arm/boot/dts/imx6qdl-sabrelite.dtsi  | 6 +++---
>  arch/arm/boot/dts/imx6qdl-sabresd.dtsi    | 6 +++---
>  7 files changed, 21 insertions(+), 21 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi b/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi
> index b5756c2..33484d8 100644
> --- a/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi
> @@ -29,9 +29,9 @@
>  
>  	backlight {
>  		compatible = "pwm-backlight";
> -		pwms = <&pwm4 0 5000000>;
> -		brightness-levels = <0 4 8 16 32 64 128 255>;
> -		default-brightness-level = <7>;
> +		pwms = <&pwm4 0 50000>;
> +		brightness-levels = <0 20 30 40 50 60 70 80 90 100>;
> +		default-brightness-level = <9>;
>  	};
>  
>  	leds {
> diff --git a/arch/arm/boot/dts/imx6qdl-gw53xx.dtsi b/arch/arm/boot/dts/imx6qdl-gw53xx.dtsi
> index 86f03c1..0d01751 100644
> --- a/arch/arm/boot/dts/imx6qdl-gw53xx.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-gw53xx.dtsi
> @@ -30,9 +30,9 @@
>  
>  	backlight {
>  		compatible = "pwm-backlight";
> -		pwms = <&pwm4 0 5000000>;
> -		brightness-levels = <0 4 8 16 32 64 128 255>;
> -		default-brightness-level = <7>;
> +		pwms = <&pwm4 0 50000>;
> +		brightness-levels = <0 20 30 40 50 60 70 80 90 100>;
> +		default-brightness-level = <9>;
>  	};
>  
>  	leds {
> diff --git a/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi b/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
> index 4a8d97f..8973bf2 100644
> --- a/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
> @@ -30,9 +30,9 @@
>  
>  	backlight {
>  		compatible = "pwm-backlight";
> -		pwms = <&pwm4 0 5000000>;
> -		brightness-levels = <0 4 8 16 32 64 128 255>;
> -		default-brightness-level = <7>;
> +		pwms = <&pwm4 0 50000>;
> +		brightness-levels = <0 20 30 40 50 60 70 80 90 100>;
> +		default-brightness-level = <9>;
>  	};
>  
>  	leds {
> diff --git a/arch/arm/boot/dts/imx6qdl-nitrogen6x.dtsi b/arch/arm/boot/dts/imx6qdl-nitrogen6x.dtsi
> index 0821812..5453cf0 100644
> --- a/arch/arm/boot/dts/imx6qdl-nitrogen6x.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-nitrogen6x.dtsi
> @@ -124,9 +124,9 @@
>  
>  	backlight_lvds {
>  		compatible = "pwm-backlight";
> -		pwms = <&pwm4 0 5000000>;
> -		brightness-levels = <0 4 8 16 32 64 128 255>;
> -		default-brightness-level = <7>;
> +		pwms = <&pwm4 0 50000>;
> +		brightness-levels = <0 20 30 40 50 60 70 80 90 100>;
> +		default-brightness-level = <9>;
>  		power-supply = <&reg_3p3v>;
>  		status = "okay";
>  	};
> diff --git a/arch/arm/boot/dts/imx6qdl-sabreauto.dtsi b/arch/arm/boot/dts/imx6qdl-sabreauto.dtsi
> index 009abd6..2bfcf5a 100644
> --- a/arch/arm/boot/dts/imx6qdl-sabreauto.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-sabreauto.dtsi
> @@ -38,9 +38,9 @@
>  
>  	backlight {
>  		compatible = "pwm-backlight";
> -		pwms = <&pwm3 0 5000000>;
> -		brightness-levels = <0 4 8 16 32 64 128 255>;
> -		default-brightness-level = <7>;
> +		pwms = <&pwm3 0 50000>;
> +		brightness-levels = <0 20 30 40 50 60 70 80 90 100>;
> +		default-brightness-level = <9>;
>  		status = "okay";
>  	};
>  };
> diff --git a/arch/arm/boot/dts/imx6qdl-sabrelite.dtsi b/arch/arm/boot/dts/imx6qdl-sabrelite.dtsi
> index 0b28a9d..d1409c0 100644
> --- a/arch/arm/boot/dts/imx6qdl-sabrelite.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-sabrelite.dtsi
> @@ -123,9 +123,9 @@
>  
>  	backlight_lvds {
>  		compatible = "pwm-backlight";
> -		pwms = <&pwm4 0 5000000>;
> -		brightness-levels = <0 4 8 16 32 64 128 255>;
> -		default-brightness-level = <7>;
> +		pwms = <&pwm4 0 50000>;
> +		brightness-levels = <0 20 30 40 50 60 70 80 90 100>;
> +		default-brightness-level = <9>;
>  		power-supply = <&reg_3p3v>;
>  		status = "okay";
>  	};
> diff --git a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> index f1cd214..3efc363 100644
> --- a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> @@ -115,9 +115,9 @@
>  
>  	backlight {
>  		compatible = "pwm-backlight";
> -		pwms = <&pwm1 0 5000000>;
> -		brightness-levels = <0 4 8 16 32 64 128 255>;
> -		default-brightness-level = <7>;
> +		pwms = <&pwm1 0 50000>;
> +		brightness-levels = <0 20 30 40 50 60 70 80 90 100>;
> +		default-brightness-level = <9>;
>  		status = "okay";
>  	};
>  
> -- 
> 1.9.1
> 

WARNING: multiple messages have this Message-ID (diff)
From: shawn.guo@linaro.org (Shawn Guo)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: dts: imx6qdl: Adjust the brightness setting for LVDS panel
Date: Tue, 20 Jan 2015 19:38:39 +0800	[thread overview]
Message-ID: <20150120113837.GC2766@dragon> (raw)
In-Reply-To: <1421749355-23050-1-git-send-email-r63905@freescale.com>

Add LAKML and a few interested people.

Shawn

On Tue, Jan 20, 2015 at 06:22:35PM +0800, Robby Cai wrote:
> Hannstar XGA panel is used by default on i.MX6QDL Sabre Auto/Lite/SD
> or derived board.
> 
> According to its data sheet [1],
> a) the dimming duty cycle is 20% - 100%.
> This patch changes the brightness-level from 20 to 100 with step 10 to
> make it straight-forward.
> b) the typical dimming frequency is 20KHz.
> The previous setting is 200Hz. This patch corrects it.
> 
> [1]
> http://boundarydevices.com/wp-content/uploads/2013/06/HSD100PXN1-A00-C11-1.0.pdf
> 
> Signed-off-by: Robby Cai <r63905@freescale.com>
> ---
>  arch/arm/boot/dts/imx6qdl-gw52xx.dtsi     | 6 +++---
>  arch/arm/boot/dts/imx6qdl-gw53xx.dtsi     | 6 +++---
>  arch/arm/boot/dts/imx6qdl-gw54xx.dtsi     | 6 +++---
>  arch/arm/boot/dts/imx6qdl-nitrogen6x.dtsi | 6 +++---
>  arch/arm/boot/dts/imx6qdl-sabreauto.dtsi  | 6 +++---
>  arch/arm/boot/dts/imx6qdl-sabrelite.dtsi  | 6 +++---
>  arch/arm/boot/dts/imx6qdl-sabresd.dtsi    | 6 +++---
>  7 files changed, 21 insertions(+), 21 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi b/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi
> index b5756c2..33484d8 100644
> --- a/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi
> @@ -29,9 +29,9 @@
>  
>  	backlight {
>  		compatible = "pwm-backlight";
> -		pwms = <&pwm4 0 5000000>;
> -		brightness-levels = <0 4 8 16 32 64 128 255>;
> -		default-brightness-level = <7>;
> +		pwms = <&pwm4 0 50000>;
> +		brightness-levels = <0 20 30 40 50 60 70 80 90 100>;
> +		default-brightness-level = <9>;
>  	};
>  
>  	leds {
> diff --git a/arch/arm/boot/dts/imx6qdl-gw53xx.dtsi b/arch/arm/boot/dts/imx6qdl-gw53xx.dtsi
> index 86f03c1..0d01751 100644
> --- a/arch/arm/boot/dts/imx6qdl-gw53xx.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-gw53xx.dtsi
> @@ -30,9 +30,9 @@
>  
>  	backlight {
>  		compatible = "pwm-backlight";
> -		pwms = <&pwm4 0 5000000>;
> -		brightness-levels = <0 4 8 16 32 64 128 255>;
> -		default-brightness-level = <7>;
> +		pwms = <&pwm4 0 50000>;
> +		brightness-levels = <0 20 30 40 50 60 70 80 90 100>;
> +		default-brightness-level = <9>;
>  	};
>  
>  	leds {
> diff --git a/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi b/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
> index 4a8d97f..8973bf2 100644
> --- a/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
> @@ -30,9 +30,9 @@
>  
>  	backlight {
>  		compatible = "pwm-backlight";
> -		pwms = <&pwm4 0 5000000>;
> -		brightness-levels = <0 4 8 16 32 64 128 255>;
> -		default-brightness-level = <7>;
> +		pwms = <&pwm4 0 50000>;
> +		brightness-levels = <0 20 30 40 50 60 70 80 90 100>;
> +		default-brightness-level = <9>;
>  	};
>  
>  	leds {
> diff --git a/arch/arm/boot/dts/imx6qdl-nitrogen6x.dtsi b/arch/arm/boot/dts/imx6qdl-nitrogen6x.dtsi
> index 0821812..5453cf0 100644
> --- a/arch/arm/boot/dts/imx6qdl-nitrogen6x.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-nitrogen6x.dtsi
> @@ -124,9 +124,9 @@
>  
>  	backlight_lvds {
>  		compatible = "pwm-backlight";
> -		pwms = <&pwm4 0 5000000>;
> -		brightness-levels = <0 4 8 16 32 64 128 255>;
> -		default-brightness-level = <7>;
> +		pwms = <&pwm4 0 50000>;
> +		brightness-levels = <0 20 30 40 50 60 70 80 90 100>;
> +		default-brightness-level = <9>;
>  		power-supply = <&reg_3p3v>;
>  		status = "okay";
>  	};
> diff --git a/arch/arm/boot/dts/imx6qdl-sabreauto.dtsi b/arch/arm/boot/dts/imx6qdl-sabreauto.dtsi
> index 009abd6..2bfcf5a 100644
> --- a/arch/arm/boot/dts/imx6qdl-sabreauto.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-sabreauto.dtsi
> @@ -38,9 +38,9 @@
>  
>  	backlight {
>  		compatible = "pwm-backlight";
> -		pwms = <&pwm3 0 5000000>;
> -		brightness-levels = <0 4 8 16 32 64 128 255>;
> -		default-brightness-level = <7>;
> +		pwms = <&pwm3 0 50000>;
> +		brightness-levels = <0 20 30 40 50 60 70 80 90 100>;
> +		default-brightness-level = <9>;
>  		status = "okay";
>  	};
>  };
> diff --git a/arch/arm/boot/dts/imx6qdl-sabrelite.dtsi b/arch/arm/boot/dts/imx6qdl-sabrelite.dtsi
> index 0b28a9d..d1409c0 100644
> --- a/arch/arm/boot/dts/imx6qdl-sabrelite.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-sabrelite.dtsi
> @@ -123,9 +123,9 @@
>  
>  	backlight_lvds {
>  		compatible = "pwm-backlight";
> -		pwms = <&pwm4 0 5000000>;
> -		brightness-levels = <0 4 8 16 32 64 128 255>;
> -		default-brightness-level = <7>;
> +		pwms = <&pwm4 0 50000>;
> +		brightness-levels = <0 20 30 40 50 60 70 80 90 100>;
> +		default-brightness-level = <9>;
>  		power-supply = <&reg_3p3v>;
>  		status = "okay";
>  	};
> diff --git a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> index f1cd214..3efc363 100644
> --- a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> @@ -115,9 +115,9 @@
>  
>  	backlight {
>  		compatible = "pwm-backlight";
> -		pwms = <&pwm1 0 5000000>;
> -		brightness-levels = <0 4 8 16 32 64 128 255>;
> -		default-brightness-level = <7>;
> +		pwms = <&pwm1 0 50000>;
> +		brightness-levels = <0 20 30 40 50 60 70 80 90 100>;
> +		default-brightness-level = <9>;
>  		status = "okay";
>  	};
>  
> -- 
> 1.9.1
> 

  reply	other threads:[~2015-01-20 11:39 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-20 10:22 [PATCH] ARM: dts: imx6qdl: Adjust the brightness setting for LVDS panel Robby Cai
2015-01-20 11:38 ` Shawn Guo [this message]
2015-01-20 11:38   ` Shawn Guo
2015-01-22 15:38   ` Philipp Zabel
2015-01-22 15:38     ` Philipp Zabel
2015-01-26 14:44     ` Robby.Cai
2015-01-26 14:44       ` Robby.Cai at freescale.com
2015-01-27 15:21       ` Philipp Zabel
2015-01-27 15:21         ` Philipp Zabel

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