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From: Heiko Stuebner <heiko@sntech.de>
To: linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v4] pwm-backlight: Avoid backlight flicker when probed from DT
Date: Tue, 10 Nov 2015 14:18:10 +0000	[thread overview]
Message-ID: <3447562.c3gSANEMio@phil> (raw)
In-Reply-To: <1446483356-14338-1-git-send-email-p.zabel@pengutronix.de>

Hi Philipp,

Am Montag, 2. November 2015, 17:55:56 schrieb Philipp Zabel:
> If the driver is probed from the device tree, and there is a phandle
> property set on it, and the enable GPIO is already configured as output,
> and the backlight is currently disabled, keep it disabled.
> If all these conditions are met, assume there will be some other driver
> that can enable the backlight at the appropriate time.
> 
> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
> Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>

this patch improves the white screen when booting a veyron chromebook
a lot. I still see a small white flash, but that can probably come from
the WIP edp driver.

Tested-by: Heiko Stuebner <heiko@sntech.de>

WARNING: multiple messages have this Message-ID (diff)
From: Heiko Stuebner <heiko@sntech.de>
To: linux-arm-kernel@lists.infradead.org
Cc: Philipp Zabel <p.zabel@pengutronix.de>,
	Thierry Reding <thierry.reding@gmail.com>,
	linux-pwm@vger.kernel.org, YH Huang <yh.huang@mediatek.com>,
	Jingoo Han <jingoohan1@gmail.com>,
	linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	Christian Gmeiner <christian.gmeiner@gmail.com>,
	kernel@pengutronix.de, Lee Jones <lee.jones@linaro.org>,
	Ajay Kumar <ajaykumar.rs@samsung.com>
Subject: Re: [PATCH v4] pwm-backlight: Avoid backlight flicker when probed from DT
Date: Tue, 10 Nov 2015 15:18:10 +0100	[thread overview]
Message-ID: <3447562.c3gSANEMio@phil> (raw)
In-Reply-To: <1446483356-14338-1-git-send-email-p.zabel@pengutronix.de>

Hi Philipp,

Am Montag, 2. November 2015, 17:55:56 schrieb Philipp Zabel:
> If the driver is probed from the device tree, and there is a phandle
> property set on it, and the enable GPIO is already configured as output,
> and the backlight is currently disabled, keep it disabled.
> If all these conditions are met, assume there will be some other driver
> that can enable the backlight at the appropriate time.
> 
> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
> Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>

this patch improves the white screen when booting a veyron chromebook
a lot. I still see a small white flash, but that can probably come from
the WIP edp driver.

Tested-by: Heiko Stuebner <heiko@sntech.de>

WARNING: multiple messages have this Message-ID (diff)
From: heiko@sntech.de (Heiko Stuebner)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4] pwm-backlight: Avoid backlight flicker when probed from DT
Date: Tue, 10 Nov 2015 15:18:10 +0100	[thread overview]
Message-ID: <3447562.c3gSANEMio@phil> (raw)
In-Reply-To: <1446483356-14338-1-git-send-email-p.zabel@pengutronix.de>

Hi Philipp,

Am Montag, 2. November 2015, 17:55:56 schrieb Philipp Zabel:
> If the driver is probed from the device tree, and there is a phandle
> property set on it, and the enable GPIO is already configured as output,
> and the backlight is currently disabled, keep it disabled.
> If all these conditions are met, assume there will be some other driver
> that can enable the backlight at the appropriate time.
> 
> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
> Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>

this patch improves the white screen when booting a veyron chromebook
a lot. I still see a small white flash, but that can probably come from
the WIP edp driver.

Tested-by: Heiko Stuebner <heiko@sntech.de>

  reply	other threads:[~2015-11-10 14:18 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-02 16:55 [PATCH v4] pwm-backlight: Avoid backlight flicker when probed from DT Philipp Zabel
2015-11-02 16:55 ` Philipp Zabel
2015-11-02 16:55 ` Philipp Zabel
2015-11-10 14:18 ` Heiko Stuebner [this message]
2015-11-10 14:18   ` Heiko Stuebner
2015-11-10 14:18   ` Heiko Stuebner
2015-11-10 17:32   ` Thierry Reding
2015-11-10 17:32     ` Thierry Reding
2015-11-10 17:32     ` Thierry Reding
2015-11-27 10:18     ` Heiko Stübner
2015-11-27 10:18       ` Heiko Stübner
2015-11-27 10:18       ` Heiko Stübner

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