On 09/20/2014 11:26 AM, James Harper wrote: >> >> 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). Ah, yes, that's rather important information :-) I'll try to reproduce it. How often does it happen? I've setup a test where I just keep streaming to see if I can reproduce it. > > 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? Can you test with the media_tree.git master branch, but going back to commit 73d8102298719863d54264f62521362487f84256? That has the cx23885 that has not yet been converted to vb2. Test with that for a while to see if that works without problems. Then go back to the HEAD of the master branch and try again. If it breaks, then I may have to revert the cx23885 vb2 changes until I figure out what's wrong. Regards, Hans > > 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 > -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
