On Wed, 8 May 2013, Joe Rayhawk wrote:
> For what it's worth, the following -stable patch
>
> "ALSA: USB: adjust for changed 3.8 USB API"
> c75c5ab575af7db707689cdbb5a5c458e9a034bb
>
> fixes the discontinuous playback on period sizes between 139 and 192,
> but the discontinuous playback on perio
On Tue, Apr 23, 2013 at 05:09:35PM +0200, Clemens Ladisch wrote:
> Alan Stern wrote:
> > On Tue, 23 Apr 2013, Clemens Ladisch wrote:
> >> Why is having a queue of two URB with one packet each suddenly not
> >> allowed?
> >
> > It _is_ allowed when URB_ISO_ASAP is clear. I have never fully
> > unde
Alan Stern wrote:
> It is now unnecessary to set urb->start_frame; in fact that field is
> now output-only.
>
> (To be fair, I haven't checked _all_ the HCDs in this regard, just
> uhci-hcd, ohci-hcd, and ehci-hcd. However, if any other HCD requires
> urb->start_frame to be set then that HCD shoul
On Tue, 23 Apr 2013, Clemens Ladisch wrote:
> Alan Stern wrote:
> > On Tue, 23 Apr 2013, Clemens Ladisch wrote:
> >> Why is having a queue of two URB with one packet each suddenly not
> >> allowed?
> >
> > It _is_ allowed when URB_ISO_ASAP is clear. I have never fully
> > understood why the audio
Alan Stern wrote:
> On Tue, 23 Apr 2013, Clemens Ladisch wrote:
>> Why is having a queue of two URB with one packet each suddenly not
>> allowed?
>
> It _is_ allowed when URB_ISO_ASAP is clear. I have never fully
> understood why the audio driver sets that flag. By setting it, you are
> telling t
On Tue, 23 Apr 2013, Clemens Ladisch wrote:
> Alan Stern wrote:
> > On Fri, 19 Apr 2013, Joe Rayhawk wrote:
> >> On Fri, Apr 19, 2013 at 02:18:24PM -0400, Alan Stern wrote:
> >>> On Fri, 19 Apr 2013, Clemens Ladisch wrote:
> Alan Stern wrote:
> > + next = uhci->frame_number
Alan Stern wrote:
> On Fri, 19 Apr 2013, Joe Rayhawk wrote:
>> On Fri, Apr 19, 2013 at 02:18:24PM -0400, Alan Stern wrote:
>>> On Fri, 19 Apr 2013, Clemens Ladisch wrote:
Alan Stern wrote:
> + next = uhci->frame_number + 2;
>
> That 2 is the minimum latency, in frames (one
On Fri, 19 Apr 2013, Joe Rayhawk wrote:
> On Fri, Apr 19, 2013 at 02:18:24PM -0400, Alan Stern wrote:
> > On Fri, 19 Apr 2013, Clemens Ladisch wrote:
> > > Alan Stern wrote:
> > > > + next = uhci->frame_number + 2;
> > > >
> > > > That 2 is the minimum latency, in frames (one frame p
On Fri, Apr 19, 2013 at 02:18:24PM -0400, Alan Stern wrote:
> On Fri, 19 Apr 2013, Clemens Ladisch wrote:
> > Alan Stern wrote:
> > > + next = uhci->frame_number + 2;
> > >
> > > That 2 is the minimum latency, in frames (one frame per ms).
> >
> > One frame worked fine with the old driver.
On Fri, 19 Apr 2013, Clemens Ladisch wrote:
> Alan Stern wrote:
> > ...
> > This trace shows that the frame numbers do not increase sequentially:
> > 1057125, 1057126, 1057128, 1057129, 1053131, ... This is because the
> > new driver is a little more conservative than the old driver,
> > requirin
Alan Stern wrote:
> ...
> This trace shows that the frame numbers do not increase sequentially:
> 1057125, 1057126, 1057128, 1057129, 1053131, ... This is because the
> new driver is a little more conservative than the old driver,
> requiring latencies to be larger than 1 ms. You can see this
> e
On Thu, 18 Apr 2013, Joe Rayhawk wrote:
> On Thu, Apr 18, 2013 at 12:42:00PM -0400, Alan Stern wrote:
> > On Wed, 17 Apr 2013, Joe Rayhawk wrote:
> > > Small buffer/period sizes on usb audio playback though UHCI works fine on
> > > v3.7 but causes audio discontinuities/delays on v3.8 and v3.9-rc7
On Thu, Apr 18, 2013 at 12:42:00PM -0400, Alan Stern wrote:
> On Wed, 17 Apr 2013, Joe Rayhawk wrote:
> > Small buffer/period sizes on usb audio playback though UHCI works fine on
> > v3.7 but causes audio discontinuities/delays on v3.8 and v3.9-rc7.
>
> Can you provide a usbmon trace showing the
On Wed, 17 Apr 2013, Joe Rayhawk wrote:
> Small buffer/period sizes on usb audio playback though UHCI works fine on
> v3.7 but causes audio discontinuities/delays on v3.8 and v3.9-rc7.
>
> I've bisected the behavior down to
>
> c44b225077bb1fb25ed5cd5c4f226897b91bedd4
> 'UHCI: implement
Small buffer/period sizes on usb audio playback though UHCI works fine on v3.7
but causes audio discontinuities/delays on v3.8 and v3.9-rc7.
I've bisected the behavior down to
c44b225077bb1fb25ed5cd5c4f226897b91bedd4
'UHCI: implement new semantics for URB_ISO_ASAP'
Tested on two UHCI ho
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