S1DREG_BBLT_CTL0
while (s1d13xxxfb_readreg(info->par, S1DREG_BBLT_CTL0) & bit) {
s1d13xxxfb_writereg(info->par, S1DREG_BBLT_CTL0, 0x0);
s1d13xxxfb_writereg(info->par, S1DREG_BBLT_CTL0, 0x80);
s1d13xxxfb_writereg(info->par, S1DREG_BBLT_CTL0, 0x0);
s1d13xxxfb_writereg(info->par, S1DREG_BBLT_CTL0, 0x80);