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Date:   Thu, 7 May 2020 18:23:00 +0800
From:   Tiezhu Yang <>
To:     Huacai Chen <>,
        Christoph Hellwig <>
Cc:     Thomas Bogendoerfer <>,
        Jiaxun Yang <>,
        "open list:MIPS" <>,
        LKML <>,
        Xuefeng Li <>
Subject: Re: [PATCH v6] MIPS: Loongson: Add DMA support for LS7A

On 05/07/2020 09:41 AM, Huacai Chen wrote:
> Hi, Christoph,
> On Wed, May 6, 2020 at 10:44 PM Christoph Hellwig <> 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.


Tiezhu Yang

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