Heiko Stuebner 12b827758f
of: also handle dma-noncoherent in of_dma_is_coherent() ...
of_dma_is_coherent() currently expects the architecture to be
non-coherent and some devices being coherent getting marked
as such with the dma-coherent devicetree property.
For PowerPC CONFIG_OF_DMA_DEFAULT_COHERENT was added which currently
makes of_dma_is_coherent() always return true but doesn't handle
the case of the architecture being coherent but some devices not.
So modify the function to also check for dma-noncoherent and
set a suitable default return value. If CONFIG_OF_DMA_DEFAULT_COHERENT
is set the value starts with true and finding dma-noncoherent will
set it to false and without CONFIG_OF_DMA_DEFAULT_COHERENT, the
behaviour is reversed.
Reviewed-by: Christoph Hellwig <hch@lst.de >
Reviewed-by: Rob Herring <robh@kernel.org >
Reviewed-by: Guo Ren <guoren@kernel.org >
Signed-off-by: Heiko Stuebner <heiko@sntech.de >
Link: https://lore.kernel.org/r/20220706231536.2041855-2-heiko@sntech.de
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com >
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12b827758f