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 period sizes
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
understood why the
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 should be
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 frame per ms).
One
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 + 2;
That 2 is
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 the host
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 driver sets
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 per ms).
One
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.
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
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,
requiring
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. What is 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 new
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
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