Andy Shevchenko <andy.shevche...@gmail.com> writes: > On Sun, Dec 20, 2015 at 7:11 PM, Måns Rullgård <m...@mansr.com> wrote: >> Julian Margetson <runa...@candw.ms> writes: >> >>> On 12/19/2015 4:41 PM, Måns Rullgård wrote: >>>> Andy Shevchenko <andy.shevche...@gmail.com> writes: >>>> >>>>> On Sat, Dec 19, 2015 at 10:16 PM, Julian Margetson <runa...@candw.ms> >>>>> wrote: >>>>>> On 12/19/2015 3:07 PM, Måns Rullgård wrote: >>>>>>> Julian Margetson <runa...@candw.ms> writes: > >>> [ 18.606292] dma dma0chan0: dwc_tx_submit: queued 2 >>> [ 18.611091] dma dma0chan0: dwc_dostart_first_queued: started 2 >>> [ 48.748614] ata3: lost interrupt (Status 0x40) >> >> Now we're getting somewhere. The dma transfer is set up and initiated, >> but then nothing happens. Comparing the old sata_dwc driver, from >> before the switch to dmaengine, with the dw_dma driver, I noticed an >> obvious problem: the descriptors are filled in using the wrong byte >> order. > > So, it means we have IO in little endian, but DMA reads data from > memory in big endian?
No, it means the IO is little endian, and the DMA reads from memory in little endian while the host CPU is big endian. >> This patch might fix that. > > In case it works I have to test it on AVR32. Unless I made a mistake, there should be no difference there. Still got to test it of course. -- Måns Rullgård -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
