On Wed, Aug 28, 2019 at 7:53 PM Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> wrote: > > 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. I retract this comment. Prior to bd2e75633c8012fc8a7431c82fda66237133bf7e, the descriptor table for ADMA is placed within the 32-bit phys address range, not exceeds the 32-bit limit. Probably, my device is not 64-bit capable. I will talk to the hardware engineer, and check the hardware spec just in case. Thanks. -- Best Regards Masahiro Yamada
