+What: /sys/bus/platform/drivers/ufshcd/*/wb_flush_threshold
+What: /sys/bus/platform/devices/*.ufs/wb_flush_threshold
+Date: June 2023
+Contact: Lu Hongfei <luhongfei@xxxxxxxx>
+Description: wb_flush_threshold is a percentage that represents the threshold for flush WB.
+ When avail_wb_buff < wb_flush_threshold, the dev will flush WB when entered H8.
+ When avail_wb_buff >= wb_flush_threshold, it is not necessary.