On Tue, 26 Mar 2013, Daniel Mack wrote: > On 24.03.2013 23:49, Eldad Zack wrote: > > > > On Wed, 6 Feb 2013, Clemens Ladisch wrote: > > > >>> Can you try using jackd -d alsa -d hw:x with the device and see if that > >>> works for you? > >> > >> That works. This means that there is a race condition in the driver, or > >> that the different open/hw_params/prepare order trips it up. > > > > Yes, and also on closing (close/hw_free). > > I finally had some time to look into this - patch below adds some > > checks and with it: > > > > * Starting playback, waiting, starting capture: capture doesn't start, > > playback continues without breaking. > > > > * Starting capture, waiting, starting playback: playback doesn't start, > > capture breaks - but it is possible to restart the streams afterwards. > > [On my setup (with xhci), when the streams break I must restart my box > > to get them to work again with current code]. > > > > * Starting both - no change, works good. > > > > This is the order the ops get called when both are start at once, if it > > helps anyone: > > > > playback capture > > open > > open > > hw_params > > set_format > > prepare > > set_format > > hw_params > > set_format > > prepare > > set_format > > prepare > > set_format > > prepare > > set_format > > trigger > > trigger > > > > I'll try to figure out why capture breaks next. > > I still quite slow around the code and don't understand some parts of > > it so this might take me a while. > > Thanks for looking into this! > > > @Daniel, do you have any hints for this case (capture breaking > > when starting playback)? > > Give me some time to catch up and rebuild my FTU setup please. I hope > I'll be able to get back to you by the end of this week. Cool, thank you! And it just remembered something. I tried to make the "in use" check non-fatal (return 0) and with a couple of more changes (very hacky) I got it to start in both orders. But the problem was that when I stopped the playback* stream my kernel "exploded" (hard lock up). But if I stopped the capture, it was ok. Playback didn't even stop. (It might have been the other way around, but I think it was playback) I can find that branch when I find some time if you think it might help. Cheers, Eldad _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
