[alsa-devel] [PATCH] US-122L Driver, v0
fzu at wemgehoertderstaat.de
Thu Nov 8 13:37:05 CET 2007
Am Donnerstag, 8. November 2007 schrieb Clemens Ladisch:
> Why not put it together with the other QUIRK_MIDI_ symbols?
> > break;
> > + case QUIRK_MIDI_US122L:
> > + umidi->usb_protocol_ops = &snd_usbmidi_122l_ops;
> > case QUIRK_MIDI_FIXED_ENDPOINT:
> > memcpy(&endpoints, quirk->data,
> > sizeof(struct snd_usb_midi_endpoint_info));
> Aaargh! If you really want to do it this way, at least add a
> "/* fall through */" so that it's obvious that this is not a mistake.
Done here, will post again.
I'd like you to try the
"ehci-hcd: complete iso urbs ASAP for number_of_packets != (n * 8) also"
snd-usb-audio uses number_of_packets equalling multiples of 8 currently
when transfering over USB 2.0, no?
If so, with above patch that "multiples of 8"-thing could go away and
snd-usb-audio could achieve up to 8 times less userspace-activation-jitter
in low latency setups like 128 frames/period, 2 periods.
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