On Thu, Oct 26, 2017 at 02:49:46PM +0200, Lothar Waßmann wrote: > When switching the backlight on, the LCD may need some time to adjust > to the configured PWM duty cycle. Add a configurable delay between > configuring the PWM and enabling the backlight regulator to account > for this. > > Signed-off-by: Lothar Waßmann <[email protected]> > --- > .../bindings/leds/backlight/pwm-backlight.txt | 4 ++++ > drivers/video/backlight/pwm_bl.c | 22 > +++++++++++++++++++--- > 2 files changed, 23 insertions(+), 3 deletions(-) > > diff --git > a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt > b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt > index 764db86..95594c3 100644 > --- a/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt > +++ b/Documentation/devicetree/bindings/leds/backlight/pwm-backlight.txt > @@ -17,6 +17,10 @@ Optional properties: > "pwms" property (see PWM binding[0]) > - enable-gpios: contains a single GPIO specifier for the GPIO which enables > and disables the backlight (see GPIO binding[1]) > + - turn-on-delay-ms: delay in milliseconds between configuring the PWM > + and switching PWM on. This may be required to eliminate > + flicker when switching the PWM on after it has been > + disabled.
The subject talks about turning on the backlight regulator, but this only talks about the PWM. > > [0]: Documentation/devicetree/bindings/pwm/pwm.txt > [1]: Documentation/devicetree/bindings/gpio/gpio.txt
