Re: [PATCH v2 2/2] dma-contiguous: Use fallback alloc_pages for single pages
From: Masahiro Yamada <hidden>
Date: 2019-08-28 10:54:36
Also in:
linux-iommu, linux-mmc, lkml
Hi Christoph, On Tue, Aug 27, 2019 at 8:55 PM Christoph Hellwig [off-list ref] wrote:
On Tue, Aug 27, 2019 at 06:03:14PM +0900, Masahiro Yamada wrote:quoted
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.
I tested v5.2 and my MMC host controller works with dma_address that exceeds 32-bit physical address. So, I believe my MMC device is 64-bit DMA capable. I am still looking into the code to find out what was changed. -- Best Regards Masahiro Yamada _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel