Hi, On Sun, Nov 25, 2018 at 09:14:28AM -0800, Tony Lindgren wrote: > * Aaro Koskinen <aaro.koskinen@xxxxxx> [181125 16:58]: > > Below changes get traffic going with DMA & g_ether... > > Oh cool, if you have dma and g_ether working, you should > test it with a variable size ping test loop :) That should > expose any issues within few minutes. The ping test is working fine. Also setting MTU higher works fine. I was also able to reduce the needed changes further, so only the below are now needed for 15xx DMA. The dma_dest_len() change I can understand. But why the BURST_4 is not working in out direction? --- a/drivers/usb/gadget/udc/omap_udc.c +++ b/drivers/usb/gadget/udc/omap_udc.c @@ -498,7 +498,7 @@ static u16 dma_dest_len(struct omap_ep *ep, dma_addr_t start) end |= start & (0xffff << 16); if (cpu_is_omap15xx()) - end++; + end += sizeof(u16); if (end < start) end += 0x10000; return end - start; @@ -754,8 +754,9 @@ static void dma_channel_claim(struct omap_ep *ep, unsigned channel) UDC_DATA_DMA, 0, 0); /* EMIFF or SDRC */ - omap_set_dma_dest_burst_mode(ep->lch, - OMAP_DMA_DATA_BURST_4); + if (!cpu_is_omap15xx()) + omap_set_dma_dest_burst_mode(ep->lch, + OMAP_DMA_DATA_BURST_4); omap_set_dma_dest_data_pack(ep->lch, 1); } } A.
