BUTTRESS_REG_SLEEP_LEVEL_CFG
val = readl(isp->base + BUTTRESS_REG_SLEEP_LEVEL_CFG);
writel(val, isp->base + BUTTRESS_REG_SLEEP_LEVEL_CFG);
val = readl(isp->base + BUTTRESS_REG_SLEEP_LEVEL_CFG);
writel(val, isp->base + BUTTRESS_REG_SLEEP_LEVEL_CFG);