Re: [PATCH 0/7] MIPS DMA coherence fixes

[Robin Murphy]

On 2023-02-21 18:15, Jiaxun Yang wrote:
> > 2023年2月21日 17:54，Christoph Hellwig <hch@xxxxxx> 写道：
> >
> > Can you explain the motivation here?  Also why riscv patches are at
> > the end of a mips fіxes series?
>
> Ah sorry for any confusion.
>
> So the main purpose of this patch is to fix MIPS’s broken per-device coherency.
> To be more precise, we want to be able to control the default coherency for all devices probed from
> devicetree in early boot code.

Including the patch which actually does that would be helpful. As it is, 
patches 4-7 here just appear to be moving an option around for no 
practical effect.

Robin.

> To achieve that I decided to reuse dma_default_coherent to set default coherency for devicetree.
> And all later patches are severing for this purpose.
>
> Thanks
> - Jiaxun