Thanks.
The board runs on Alsa 1.0.25 and a 3.4 kernel with the old endpoint
streaming model,
I'll try to bring it up with the current release.
2016-02-14 12:26 GMT+01:00 Clemens Ladisch <cladi...@googlemail.com>:
> I wrote:
> > P Z wrote:
> >> The distortion characteristics on arm changed slightly, which points to
> a firmware issue.
> >
> > I suspect that the DMA of the frequency feedback data is not handled
> correctly.
>
> Please try the patch below.
>
>
> Regards,
> Clemens
>
>
> --- a/sound/usb/card.h
> +++ b/sound/usb/card.h
> @@ -76,8 +76,6 @@ struct snd_usb_endpoint {
> unsigned int nurbs; /* # urbs */
> unsigned long active_mask; /* bitmask of active urbs */
> unsigned long unlink_mask; /* bitmask of unlinked urbs */
> - char *syncbuf; /* sync buffer for all sync URBs */
> - dma_addr_t sync_dma; /* DMA address of syncbuf */
>
> unsigned int pipe; /* the data i/o pipe */
> unsigned int freqn; /* nominal sampling rate in fs/fps
> in Q16.16 format */
> diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
> index 7b1cb36..c9817ca 100644
> --- a/sound/usb/endpoint.c
> +++ b/sound/usb/endpoint.c
> @@ -593,11 +593,6 @@ static void release_urbs(struct snd_usb_endpoint *ep,
> int force)
> for (i = 0; i < ep->nurbs; i++)
> release_urb_ctx(&ep->urb[i]);
>
> - if (ep->syncbuf)
> - usb_free_coherent(ep->chip->dev, SYNC_URBS * 4,
> - ep->syncbuf, ep->sync_dma);
> -
> - ep->syncbuf = NULL;
> ep->nurbs = 0;
> }
>
> @@ -789,22 +784,21 @@ static int sync_ep_set_params(struct
> snd_usb_endpoint *ep)
> {
> int i;
>
> - ep->syncbuf = usb_alloc_coherent(ep->chip->dev, SYNC_URBS * 4,
> - GFP_KERNEL, &ep->sync_dma);
> - if (!ep->syncbuf)
> - return -ENOMEM;
> -
> for (i = 0; i < SYNC_URBS; i++) {
> struct snd_urb_ctx *u = &ep->urb[i];
> u->index = i;
> u->ep = ep;
> u->packets = 1;
> + u->buffer_size = 4;
> u->urb = usb_alloc_urb(1, GFP_KERNEL);
> if (!u->urb)
> goto out_of_memory;
> - u->urb->transfer_buffer = ep->syncbuf + i * 4;
> - u->urb->transfer_dma = ep->sync_dma + i * 4;
> - u->urb->transfer_buffer_length = 4;
> + u->urb->transfer_buffer =
> + usb_alloc_coherent(ep->chip->dev, u->buffer_size,
> + GFP_KERNEL,
> &u->urb->transfer_dma);
> + if (!u->urb->transfer_buffer)
> + goto out_of_memory;
> + u->urb->transfer_buffer_length = u->buffer_size;
> u->urb->pipe = ep->pipe;
> u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
> u->urb->number_of_packets = 1;
>
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