From mboxrd@z Thu Jan 1 00:00:00 1970 From: Enric Balletbo i Serra Date: Fri, 10 Nov 2017 11:22:15 +0000 Subject: Re: [PATCH 0/2] backlight: pwm_bl: prevent backlight flicker when switching PWM on Message-Id: <8682e9c4-518d-5dce-55c5-c221dddd5fd6@collabora.com> List-Id: References: <1509022186-19636-1-git-send-email-LW@KARO-electronics.de> <1509022186-19636-2-git-send-email-LW@KARO-electronics.de> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: quoted-printable To: Daniel Thompson , =?UTF-8?Q?Lothar_Wa=c3=9fmann?= , Bartlomiej Zolnierkiewicz , Jacek Anaszewski , Jingoo Han , Lee Jones , Mark Rutland , Pavel Machek , Richard Purdie , Rob Herring , Thierry Reding , devicetree@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org, linux-pwm@vger.kernel.org Hi all, On 08/11/17 11:48, Daniel Thompson wrote: > On 26/10/17 13:49, Lothar Wa=C3=9Fmann 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 >=20 > Other than hoisting the pwm_enable() even earlier in the setup sequence t= his > patchset seems to have a significant overlap with Enric's recent posting: >=20 > https://lkml.org/lkml/2017/7/21/211 >=20 > Any chance of a shared view on this, especially on the DT bindings? >=20 The DT binding were discussed some time ago for the patch series I sent, th= ough there isn't a final ack from DT maintainer. Lothar, the series I sent have been reviewed and acked, can you test if the series fixes the problem for you too? Thanks, Enric >=20 >=20 > Daniel.