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Date:   Tue, 27 Aug 2019 13:55:41 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Masahiro Yamada <yamada.masahiro@socionext.com>
Cc:     Christoph Hellwig <hch@lst.de>,
        Nicolin Chen <nicoleotsuka@gmail.com>,
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Subject: Re: [PATCH v2 2/2] dma-contiguous: Use fallback alloc_pages for
 single pages
Message-ID: <20190827115541.GB5921@lst.de>
References: <20190506223334.1834-1-nicoleotsuka@gmail.com> <20190506223334.1834-3-nicoleotsuka@gmail.com> <CAK7LNARacEorb38mVBw_V-Zvz-znWgBma1AP1-z_5B_xZU4ogg@mail.gmail.com> <CAK7LNAQfYBCoChMV=MOwcUyVoqRkrPWs7DaWdzDqjBe18gGiAQ@mail.gmail.com> <20190825011025.GA23410@lst.de> <CAK7LNAQb1ZHr=DiHLNeNRaQExMuXdDOV4sFghoGbco_Q=Qzb8g@mail.gmail.com> <20190826073320.GA11712@lst.de> <CAK7LNATYOLEboUTO4qPx2z7cqwDrHBO1HFHG8VzZEJ15STv+nw@mail.gmail.com> <20190827075021.GA953@lst.de> <CAK7LNAQZ+bueZZzSoMADmgLjWNvijHRV=wLQzN_kvLG3b5Uu+w@mail.gmail.com>
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On Tue, Aug 27, 2019 at 06:03:14PM +0900, Masahiro Yamada wrote:
> Yes, this makes my driver working again
> when CONFIG_DMA_CMA=y.
> 
> 
> If I apply the following, my driver gets back working
> irrespective of CONFIG_DMA_CMA.

That sounds a lot like the device simply isn't 64-bit DMA capable, and
previously always got CMA allocations under the limit it actually
supported.  I suggest that you submit this quirk to the mmc maintainers.