backlight: lp855x: Initialize PWM state on first brightness change
As pointed out by Uwe Kleine-König[1], the changes introduced in commit c1ff7da0 ("video: backlight: lp855x: Get PWM for PWM mode during probe") caused the PWM state set up by the bootloader to be re-set when the driver is probed. This differs from the behavior from before that patch, where the PWM state would be initialized on the first brightness change. Fix this by moving the PWM state initialization into the PWM control function. Add a new variable, needs_pwm_init, to the device info struct to allow us to check whether we need the initialization, or whether it has already been done. [1] https://lore.kernel.org/lkml/20230614083953.e4kkweddjz7wztby@pengutronix.de/ Fixes: c1ff7da0 ("video: backlight: lp855x: Get PWM for PWM mode during probe") Signed-off-by: Artur Weber <aweber.kernel@gmail.com> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> Link: https://lore.kernel.org/r/20230714121440.7717-2-aweber.kernel@gmail.com Signed-off-by: Lee Jones <lee@kernel.org>
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