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backlight: pwm_bl: Check the PWM state for initial backlight power state 

If the PWM is not enabled the backlight initially should not be enabled
either if we have booted with DT and there is a phandle pointing to the
backlight node.

The patch extends the checks to decide if we should keep the backlight off
initially.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Peter Ujfalusi 2016-11-22 15:41:23 +02:00 committed by Lee Jones
parent 7613c92231
commit d1b8129457
1 changed files with 4 additions and 0 deletions
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4
drivers/video/backlight/pwm_bl.c
View File

@ -215,6 +215,10 @@ static int pwm_backlight_initial_power_state(const struct pwm_bl_data *pb)
if (!regulator_is_enabled(pb->power_supply))
return FB_BLANK_POWERDOWN;
/* The PWM is disabled, keep it like this */
if (!pwm_is_enabled(pb->pwm))
return FB_BLANK_POWERDOWN;
return FB_BLANK_UNBLANK;
}