Messages in this thread | | | Date | Tue, 22 Nov 2022 16:54:31 +0800 | Subject | Re: [PATCH] ALSA: usb-audio: fix urb timeout with URB_ISO_ASAP flag | From | Michael Wu <> |
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On 11/22/2022 4:46 PM, Takashi Iwai wrote: > On Tue, 22 Nov 2022 09:20:40 +0100, > Michael Wu wrote: >> >> When the loglevel is greater than 4, with a long messages printed on the >> console while playing or recording audios, the usb controller may become >> abnormal. >> `usb 1-2: timeout: still 1 active urbs on EP #1` >> >> Fix it by configuring the transfer_flags URB_ISO_ASAP flag. >> >> Signed-off-by: Michael Wu <michael@allwinnertech.com> > > Hrm, that's somewhat backward action to the change we've done years > ago, commit c75c5ab575af7db707689cdbb5a5c458e9a034bb: > > ALSA: USB: adjust for changed 3.8 USB API > > The recent changes in the USB API ("implement new semantics for > URB_ISO_ASAP") made the former meaning of the URB_ISO_ASAP flag the > default, and changed this flag to mean that URBs can be delayed. > This is not the behaviour wanted by any of the audio drivers because > it leads to discontinuous playback with very small period sizes. > Therefore, our URBs need to be submitted without this flag. > > I rather suspect that your problem is in the USB controller side. > > > thanks, > > Takashi > Dear Takashi, thanks for the reminding. Let me check...
-- Regards, Michael Wu
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