Re: [PATCH v2 4/5] riscv: Select ARCH_DMA_DEFAULT_COHERENT

[Conor Dooley <conor@kernel.org>]

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On Thu, Feb 23, 2023 at 11:36:43AM +0000, Jiaxun Yang wrote:
> For riscv our assumption is unless a device states it is non-coherent,
> we take it to be DMA coherent.
> 
> Select ARCH_DMA_DEFAULT_COHERENT to ensure dma_default_coherent
> is always initialized to true.
> 
> Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
> ---
>  arch/riscv/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 1d46a268ce16..b71ce992c0c0 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -233,6 +233,7 @@ config LOCKDEP_SUPPORT
>  
>  config RISCV_DMA_NONCOHERENT
>  	bool
> +	select ARCH_DMA_DEFAULT_COHERENT

Since we are always coherent by default, I feel like you should put this
in the main "config RISCV" section, where OF_DMA_DEFAULT_COHERENT
currently is, no?

Wouldn't bother respinning for that unless the dma folk have comments
for you.

>  	select ARCH_HAS_DMA_PREP_COHERENT
>  	select ARCH_HAS_SETUP_DMA_OPS
>  	select ARCH_HAS_SYNC_DMA_FOR_CPU
> -- 
> 2.37.1 (Apple Git-137.1)
> 

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