On Tue, Feb 22, 2022 at 05:14:16PM +0800, Baoquan He wrote:

quoted

No, if you change it, it should be dma_set_coherent_mask only as it is
not using streaming mappings.  I suspect dma_set_mask_and_coherent is
the right thing if the driver ever wants to use streaming mapping,
it would just need to be documented in the commit message.

It will serve dma_alloc_noncoherent() calling later, should be streaming
mapping?

No, that also looks at the coherent mask.  Which is a bit misnamed these
days, it really should be the alloc mask.