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Subject: Re: [PATCH 0/2] backlight: pwm_bl: prevent backlight flicker when
 switching PWM on
To: =?UTF-8?Q?Lothar_Wa=c3=9fmann?= <LW@KARO-electronics.de>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        Jacek Anaszewski <jacek.anaszewski@gmail.com>,
        Jingoo Han <jingoohan1@gmail.com>, Lee Jones <lee.jones@linaro.org>,
        Mark Rutland <mark.rutland@arm.com>, Pavel Machek <pavel@ucw.cz>,
        Richard Purdie <rpurdie@rpsys.net>, Rob Herring <robh+dt@kernel.org>,
        Thierry Reding <thierry.reding@gmail.com>, devicetree@vger.kernel.org,
        linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-leds@vger.kernel.org, linux-pwm@vger.kernel.org,
        Enric Balletbo i Serra <enric.balletbo@collabora.com>
References: <1509022186-19636-1-git-send-email-LW@KARO-electronics.de>
 <1509022186-19636-2-git-send-email-LW@KARO-electronics.de>
From: Daniel Thompson <daniel.thompson@linaro.org>
Message-ID: <cec1af21-8a6d-f9f3-eaf0-197ba68d87ee@linaro.org>
Date: Wed, 8 Nov 2017 10:48:01 +0000
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On 26/10/17 13:49, Lothar Waßmann wrote:
> These patches implement some measures to prevent backlight flicker
> when the backlight is being switched on for a display with an active
> low brightness control pin.
> GIT: [PATCH 1/2] backlight: pwm_bl: Enable PWM before switching regulator
> GIT: [PATCH 2/2] backlight: pwm_bl: add configurable delay between

Other than hoisting the pwm_enable() even earlier in the setup sequence 
this patchset seems to have a significant overlap with Enric's recent 
posting:

   https://lkml.org/lkml/2017/7/21/211

Any chance of a shared view on this, especially on the DT bindings?



Daniel.