pwm-backlight: handle BL_CORE_FBBLANK state
According to include/linux/backlight.h, the fb_blank field is to be removed and blank status should preferably be set by setting the BL_CORE_FBBLANK bit of the state field. This patch ensures this condition is also taken into account when updating the backlight state. Signed-off-by: NAlexandre Courbot <acourbot@nvidia.com> Signed-off-by: NThierry Reding <thierry.reding@avionic-design.de>
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