linux-kernel - Re: [PATCH 0/2] backlight: pwm_bl: prevent backlight flicker when switching PWM on

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Message-ID: <cec1af21-8a6d-f9f3-eaf0-197ba68d87ee@linaro.org>
Date:   Wed, 8 Nov 2017 10:48:01 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Lothar Waßmann <LW@...O-electronics.de>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Pavel Machek <pavel@....cz>,
        Richard Purdie <rpurdie@...ys.net>,
        Rob Herring <robh+dt@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        devicetree@...r.kernel.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        linux-pwm@...r.kernel.org,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>
Subject: Re: [PATCH 0/2] backlight: pwm_bl: prevent backlight flicker when
 switching PWM on

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.