[PATCH] backlight: pwm_bl: Avoid backlight flicker applying initial PWM state

[Daniel Thompson]

On Thu, Jun 08, 2023 at 04:11:14PM +0200, Philipp Zabel wrote:
> The initial PWM state returned by pwm_init_state() has a duty cycle
> of 0 ns. To avoid backlight flicker when taking over an enabled
> display from the bootloader, skip the initial pwm_apply_state()
> and leave the PWM be until backlight_update_state() will apply the
> state with the desired brightness.

backlight_update_state() uses pwm_get_state() to update the PWM.

Without applying something that came from pwm_init_state() then
we will never adopt the reference values from pwm->args.


Daniel.