Re: [PATCH 4/4] mmc: sdhci: Add DMA memory boundary workaround

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On Tue, Dec 03, 2019 at 09:49:49AM +0000, Jisheng Zhang wrote:
> > As in exactly one boundary and not an alignment?  Where the one
> > boundary is not a power of two and thus can't be expressed?
> 
> Take drivers/mmc/host/sdhci-of-dwcmshc.c for example, target physical DMA addr
> can't span 128MB, 256MB, 128*3MB, ...128*nMB
> 
> I'm not sure whether blk_queue_segment_boundary could solve this limitation.

That is exaxtly the kind of limitation blk_queue_segment_boundary is
intended for.



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