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

Hi,

On Fri, 10 Nov 2017 12:22:15 +0100 Enric Balletbo i Serra wrote:

Hi all,

On 08/11/17 11:48, Daniel Thompson wrote:

quoted

On 26/10/17 13:49, Lothar Waßmann wrote:

quoted

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?

The DT binding were discussed some time ago for the patch series I sent, though
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?

I'll try to test it within the next couple of days and will report back.


Lothar Waßmann