V4L2 video decoder buffer fence

[Bing Song]

Hi,

I want to implement v4l2 video decoder buffer fence. But I don't know why it can benefit performance? Video HW decoder is one step decode. We use Hantro video decoder. CPU SW will parser SPS/PPS and slice header. HW will decode video frame within one step decode. How dma buf fence can benefit decode performance?

Regards,
Bing
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