[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: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
index 4bacb50..6330788 100644
--- a/sound/usb/usbmidi.c
+++ b/sound/usb/usbmidi.c
@@ -1351,6 +1351,13 @@
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 @@
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);