FP_SYNC_START
regp->fp_horiz_regs[FP_SYNC_START] = output_mode->hsync_start - 1;
regp->fp_vert_regs[FP_SYNC_START] = output_mode->vsync_start - 1;
regs->fp_horiz_regs[FP_SYNC_START] =
regs->fp_vert_regs[FP_SYNC_START] =