显示监视器计时计算

Question

我有这样的结构，其中写了监视器计时：

   [MVDU_MODE_HD_720_P_50] = {
        .width = 1280,
        .height = 720,
        .vmode = MVDU_MODE_PROGRESSIVE,
        .pixclock = 74250000,
        .mode = 0x17,
        .h_blank = 692,
        .h_active = 1280,
        .h_total = 1980,
        .hs_start = 440,
        .hs_len = 40,
        .hs_delay = 220,
        .v_blank_beg = 25,
        .v_active = 720,
        .v_total = 750,
        .v_blank_end = 5,
        .vs_start = 0,
        .vs_len = 5,
        .vs_p = 1,
}

所以，我已经确定

1. v_total = 780-806;
2. v-active = 768;
3. h_total = 1,344;
4. h-active = 1024;
5. pixclock = 74250000或27000000。

我如何计算其他参数？