Commit 56162aab authored by Clemens Ladisch's avatar Clemens Ladisch Committed by Jaroslav Kysela
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[ALSA] usb-audio: add workaround for ESI MIDI Mate/RomIO II 



Force low speed USB MIDI devices like the ESI MIDI Mate and RomIO II to
use interrupt transfers because the USB core would not be happy about
low speed bulk transfers.

Signed-off-by: default avatarClemens Ladisch <clemens@ladisch.de>
Signed-off-by: default avatarJaroslav Kysela <perex@suse.cz>
parent 076639f6

sound/usb/usbmidi.c

+9 −0
Original line number Diff line number Diff line
@@ -1351,6 +1351,13 @@ static int snd_usbmidi_get_ms_info(struct snd_usb_midi* umidi, 
			endpoints[epidx].out_ep = ep->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;

			if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)

				endpoints[epidx].out_interval = ep->bInterval;

			else if (snd_usb_get_speed(umidi->chip->dev) == USB_SPEED_LOW)

				/*

				 * Low speed bulk transfers don't exist, so

				 * force interrupt transfers for devices like

				 * ESI MIDI Mate that try to use them anyway.

				 */

				endpoints[epidx].out_interval = 1;

			endpoints[epidx].out_cables = (1 << ms_ep->bNumEmbMIDIJack) - 1;

			snd_printdd(KERN_INFO "EP %02X: %d jack(s)\n",

				    ep->bEndpointAddress, ms_ep->bNumEmbMIDIJack);
@@ -1364,6 +1371,8 @@ static int snd_usbmidi_get_ms_info(struct snd_usb_midi* umidi, 
			endpoints[epidx].in_ep = ep->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;

			if ((ep->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)

				endpoints[epidx].in_interval = ep->bInterval;

			else if (snd_usb_get_speed(umidi->chip->dev) == USB_SPEED_LOW)

				endpoints[epidx].in_interval = 1;

			endpoints[epidx].in_cables = (1 << ms_ep->bNumEmbMIDIJack) - 1;

			snd_printdd(KERN_INFO "EP %02X: %d jack(s)\n",

				    ep->bEndpointAddress, ms_ep->bNumEmbMIDIJack);

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