Re: [PATCH v6] MIPS: Loongson: Add DMA support for LS7A

[Tiezhu Yang]

On 05/07/2020 09:41 AM, Huacai Chen wrote:
> Hi, Christoph,
>
> On Wed, May 6, 2020 at 10:44 PM Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> > On Wed, May 06, 2020 at 04:47:30PM +0800, Huacai Chen wrote:
> > > > For the above reasons, I think what you are concerned is not a
> > > > big deal.
> > > I don't think so, this is obviously a regression. If we can accept a
> > > regression of RS780E, why we still maintain Loongson-2EF rather than
> > > simply drop them?
> > While I much prefer to use the default, regression an otherwise
> > working platform seems like a bad idea.  I don't really know much
> > about the Loongson platforms, do they all boot using the same kernel
> > image?
> All Loongson-3 machines (with LS7A bridge or RS780 bridge) use the
> same kernel image.

Hi Christoph, Huacai and Jiaxun,

Thank you very much for your reviews and discussions.

If you agree to use the platform dependent implementation
of __phys_to_dma() and __dma_to_phys(), I will make a slight
modification based on the v4 patch [1] to put ls7a things
before rs780e things, and then send v7 as soon as possible.

If anyone has any objections, please let me know.

[1] https://lore.kernel.org/patchwork/patch/1220010/

Thanks,
Tiezhu Yang