>
> On 09/20/2014 05:32 AM, James Harper wrote:
> >
> > My cx23885 based DViCO FusionHDTV DVB-T Dual Express2 (I submitted a
> > patch for this a little while ago) has been working great but over
> > the last few months it has started playing up. Nothing has really
> > changed that I can put my finger on. Basically mythtv stops recording
> > after a few minutes sometimes. Rarely when this happens I see some
> > i2c errors but mostly not.
> >
> > With cx23885 debug options turned on (debug=9 vbi_debug=9
> v4l_debug=9
> > video_debug=9 irq_debug=9 ci_dbg=9) it seems like the card just stops
> > delivering buffers (see dmesg output following). If I stop mythtv,
> > all the buffers are cancelled (cx23885_stop_dma()) etc, and then
> > restarting mythtv will get the recording going again, for a short
> > time (minutes).
> >
> > Any suggestions to where I could start looking? Is it possible that
> > my card itself is broken? (apart from this it's flawless).
>
> I see nothing wrong in the log, but you can try to use the current media_tree
> code. The cx23885's DMA engine has effectively been rewritten there,
> simplifying
> the control flow.
>
Oops I should have mentioned that. I'm using Debian "Jessie" with 3.16 kernel and already using the latest v4l as per link you sent (my DViCO FusionHDTV DVB-T Dual Express2 patch is in 3.17 I think, but that's not in Debian yet).
I think it only broke since the rewrite. Before that it seemed to be bulletproof. That was why I asked about the patch just before - I can't tell yet if the driver stops supplying data or if mythtv stops asking for data. If there was something funny about the poll loop then that could cause it. I suppose I can try and go back to an older version of the code and see what happens?
Would the bug fixed by your "fix VBI/poll regression" patch cause intermittent stalls, or would the application that relied on the missing behaviour simply not work at all?
In any case I've just applied the patch and about to reboot.
Thanks
James
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