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AFE MAP SET registers in ADV7842 not able to write but able to read

We have made a board, using ADV7842 connected to Processor board running on linux.

We are using linux driver(GPL.lisence).

Here we could able to read and write CP memory map registers but we are not able to write AFE memory map registers.

Evolution board scripts are use as such.

Is there any enable mechanism or any hidden information is there to access AFE memory map registers.

Please suggest to resolve this issue.