linux-kernel - Re: [PATCH v4] pwm-backlight: Avoid backlight flicker when probed from DT

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Date:	Tue, 10 Nov 2015 15:18:10 +0100
From:	Heiko Stuebner <heiko@...ech.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Philipp Zabel <p.zabel@...gutronix.de>,
	Thierry Reding <thierry.reding@...il.com>,
	linux-pwm@...r.kernel.org, YH Huang <yh.huang@...iatek.com>,
	Jingoo Han <jingoohan1@...il.com>, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Christian Gmeiner <christian.gmeiner@...il.com>,
	kernel@...gutronix.de, Lee Jones <lee.jones@...aro.org>,
	Ajay Kumar <ajaykumar.rs@...sung.com>
Subject: Re: [PATCH v4] pwm-backlight: Avoid backlight flicker when probed from DT

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@...gutronix.de>
> Reviewed-by: Christian Gmeiner <christian.gmeiner@...il.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@...ech.de>
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