Hi,
Mathias Nyman <mathias.ny...@linux.intel.com> writes:
> @@ -3098,24 +3136,66 @@ static u32 xhci_td_remainder(struct xhci_hcd *xhci,
> int transferred,
> return (total_packet_count - ((transferred + trb_buff_len) / maxp));
> }
>
> +
> static int xhci_align_td(struct xhci_hcd *xhci, struct urb *urb, u32
> enqd_len,
> - u32 *trb_buff_len)
> + u32 *trb_buff_len, struct xhci_segment *seg)
> {
> + struct device *dev = xhci_to_hcd(xhci)->self.controller;
> unsigned int unalign;
> unsigned int max_pkt;
> + u32 new_buff_len;
>
> - max_pkt = usb_endpoint_maxp(&urb->ep->desc); /*FIXME MATTU GET_MAX..? */
> + max_pkt = GET_MAX_PACKET(usb_endpoint_maxp(&urb->ep->desc));
> unalign = (enqd_len + *trb_buff_len) % max_pkt;
>
> /* we got lucky, last normal TRB data on segment is packet aligned */
> if (unalign == 0)
> return 0;
>
> + xhci_dbg(xhci, "Unaligned %d bytes, buff len %d\n",
> + unalign, *trb_buff_len);
> +
> /* is the last nornal TRB alignable by splitting it */
> if (*trb_buff_len > unalign) {
> *trb_buff_len -= unalign;
> + xhci_dbg(xhci, "split align, new buff len %d\n", *trb_buff_len);
> return 0;
> }
> +
> + /*
> + * We want enqd_len + trb_buff_len to sum up to a number aligned to
> + * number which is divisible by the endpoint's wMaxPacketSize. IOW:
> + * (size of currently enqueued TRBs + remainder) % wMaxPacketSize == 0.
> + */
> + new_buff_len = max_pkt - (enqd_len % max_pkt);
> +
> + if (new_buff_len > (urb->transfer_buffer_length - enqd_len))
> + new_buff_len = (urb->transfer_buffer_length - enqd_len);
> +
> + /* create a max max_pkt sized bounce buffer pointed to by last trb */
> + if (usb_urb_dir_out(urb)) {
> + sg_pcopy_to_buffer(urb->sg, urb->num_mapped_sgs,
> + seg->bounce_buf, new_buff_len, enqd_len);
> + seg->bounce_dma = dma_map_single(dev, seg->bounce_buf,
> + max_pkt, DMA_TO_DEVICE);
> + } else {
> + seg->bounce_dma = dma_map_single(dev, seg->bounce_buf,
> + max_pkt, DMA_FROM_DEVICE);
> + }
> +
> + if (dma_mapping_error(dev, seg->bounce_dma)) {
> + /* try without aligning. Some host controllers survive */
> + xhci_warn(xhci, "Failed mapping bounce buffer, not aligning\n");
> + return 0;
> + }
> + *trb_buff_len = new_buff_len;
> + seg->bounce_len = new_buff_len;
> + seg->bounce_offs = enqd_len;
> +
> + xhci_dbg(xhci, "Bounce align, new buff len %d\n", *trb_buff_len);
> +
> + /* FIXME MATTU make sure memory allocated memory is 64k aligned */
^^^^^^^^^^^^^^^^^^^^^
do you wanna clean this up ?-- balbi
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