From 56162aabb2fb8b9f4a8266feb7eb4edd9d1a4d49 Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Tue, 21 Aug 2007 08:57:34 +0200 Subject: [PATCH] [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 Signed-off-by: Jaroslav Kysela --- sound/usb/usbmidi.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c index 4bacb50e9ad9..6330788c1c2b 100644 --- a/sound/usb/usbmidi.c +++ b/sound/usb/usbmidi.c @@ -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); -- 2.20.1