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

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Date:   Thu, 7 May 2020 18:23:00 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Huacai Chen <chenhc@...ote.com>,
        Christoph Hellwig <hch@...radead.org>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        "open list:MIPS" <linux-mips@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Xuefeng Li <lixuefeng@...ngson.cn>
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 <hch@...radead.org> 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