Hi Christoph, On Tue, Aug 27, 2019 at 8:55 PM Christoph Hellwig <hch@xxxxxx> wrote: > > 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. 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
