'If two smart phones are directly connected, which will charge the other?

I have always had a question, when two phones are directly connected, who is charging the another.

So I find two phones, OPPO find x5 pro(A) and OPPO find x5(B). Their OS are coloros12(Android 12).

Then I found that when I connect them (A and B) with a double-ended typec cable, sometimes A is the power supply (host), and sometimes B, there is no rule to follow. (The OTG function is not turned on in the settings of both phones. It seems to be automatically negotiated and turned on at the instant of connection.)

I know this is an OTG related question but would like to know more. And how can I always keep A as the host side after every connection.

By the way, Oneplus 10 pro can also reproduce this phenomenon.

Thanks a lot.

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'If two smart phones are directly connected, which will charge the other?

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