Hans,
>>>>
>>>> /* timing data values specified by various standards such as BT.1120,
>>>> BT.656 etc. */
>>>>
>>>> /* bt.656/bt.1120 timing data */
>>>> struct v4l2_bt_timings {
>>>> __u32 interlaced;
>>>> __u64 pixelclock;
>>>> __u32 width, height;
>>>> __u32 polarities;
>>>> __u32 hfrontporch, hsync, htotal;
>>>> __u32 vfrontporch, vsync, vtotal;
>>>> /* timings for bottom frame for interlaced formats */
>>>> __u32 il_vtotal;
>>>> __u32 reserved[16];
>>>> };
>>>
>>>I think that we should be a change here: instead of specifying htotal and
>>>vtotal it is more symmetrical to specify hbackporch and vbackporch.
>>>
>>>And instead of il_vtotal I think it is better to specify il_vfrontporch,
>>>il_vsync, il_vbackporch. Since any of these three parameters can be the
>>>one that is 1 longer than the top field.
>>
>>
>> [MK] So are you saying we need all four:- il_vtotal, il_vfrontporch,
>> il_vsync, & il_vbackporch ?
>
>No, the htotal, vtotal and il_vtotal fields should be removed. These can
>be calculated from adding up the other fields.
>
[MK] Ok. That make sense. Here is the final structure...
struct v4l2_bt_timings {
__u32 interlaced;
__u64 pixelclock;
__u32 width, height;
__u32 polarities;
__u32 hfrontporch, hsync, hbackporch;
__u32 vfrontporch, vsync, vbackporch;
/* timings for bottom frame for interlaced formats */
__u32 il_vfrontporch, il_vsync, il_vbackporch ;
__u32 reserved[16];
};
Murali
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