> 2023年2月21日 19:46，Robin Murphy <robin.mur...@arm.com> 写道：
>
> On 2023-02-21 18:15, Jiaxun Yang wrote:
>>> 2023年2月21日 17:54，Christoph Hellwig <h...@lst.de> 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.
Well the affect is default coherency of devicetree probed devices are now
following dma_default_coherent
instead of a static Kconfig option. For MIPS platform, dma_default_coherent
will be determined by boot code.
Thanks
- Jiaxun
