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Commit a6a712ae authored by Clemens Ladisch's avatar Clemens Ladisch Committed by Jaroslav Kysela
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[ALSA] usb-audio: allow output interrupt transfers for MIDI 



Allow output interrupt transfers for some MIDI devices that require
them.

Signed-off-by: default avatarClemens Ladisch <clemens@ladisch.de>
Signed-off-by: default avatarJaroslav Kysela <perex@suse.cz>
parent d53d7d9e

sound/usb/usbmidi.c

+12 −4
Original line number Diff line number Diff line
@@ -983,7 +983,9 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi* umidi, 
		snd_usbmidi_out_endpoint_delete(ep);

		return -ENOMEM;

	}

	/* we never use interrupt output pipes */

	if (ep_info->out_interval)

		pipe = usb_sndintpipe(umidi->chip->dev, ep_info->out_ep);

	else

		pipe = usb_sndbulkpipe(umidi->chip->dev, ep_info->out_ep);

	if (umidi->chip->usb_id == USB_ID(0x0a92, 0x1020)) /* ESI M4U */

		/* FIXME: we need more URBs to get reasonable bandwidth here: */
@@ -996,8 +998,14 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi* umidi, 
		snd_usbmidi_out_endpoint_delete(ep);

		return -ENOMEM;

	}

	usb_fill_bulk_urb(ep->urb, umidi->chip->dev, pipe, buffer,

			  ep->max_transfer, snd_usbmidi_out_urb_complete, ep);

	if (ep_info->out_interval)

		usb_fill_int_urb(ep->urb, umidi->chip->dev, pipe, buffer,

				 ep->max_transfer, snd_usbmidi_out_urb_complete,

				 ep, ep_info->out_interval);

	else

		usb_fill_bulk_urb(ep->urb, umidi->chip->dev,

				  pipe, buffer, ep->max_transfer,

				  snd_usbmidi_out_urb_complete, ep);

	ep->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;



	spin_lock_init(&ep->buffer_lock);