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| author | Clemens Ladisch <clemens@ladisch.de> | 2007-05-07 11:29:32 +0400 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2007-05-11 18:56:17 +0400 |
| commit | 490cbd92ed4d9915b582f4e40c605eeb977e5d40 (patch) | |
| tree | afbe6759e98fe65ac4015869139c347b52ef8f44 | |
| parent | d05cc104320210e1c38ff9675c5038cffb2d86dc (diff) | |
| download | linux-490cbd92ed4d9915b582f4e40c605eeb977e5d40.tar.xz | |
[ALSA] usb-audio: work around wrong wMaxPacketSize on ESI M4U
Add a workaround for the ESI M4U that claims to support 32-byte packets
but ignores the remaining bytes of packets bigger than four bytes.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
| -rw-r--r-- | sound/usb/usbmidi.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c index 911f4482b5e1..99295f9b7691 100644 --- a/sound/usb/usbmidi.c +++ b/sound/usb/usbmidi.c @@ -965,7 +965,11 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi* umidi, } /* we never use interrupt output pipes */ pipe = usb_sndbulkpipe(umidi->chip->dev, ep_info->out_ep); - ep->max_transfer = usb_maxpacket(umidi->chip->dev, pipe, 1); + if (umidi->chip->usb_id == USB_ID(0x0a92, 0x1020)) /* ESI M4U */ + /* FIXME: we need more URBs to get reasonable bandwidth here: */ + ep->max_transfer = 4; + else + ep->max_transfer = usb_maxpacket(umidi->chip->dev, pipe, 1); buffer = usb_buffer_alloc(umidi->chip->dev, ep->max_transfer, GFP_KERNEL, &ep->urb->transfer_dma); if (!buffer) { |