[linux-dvb] bt878(0): IRQ lockup, cleared int mask

David Johnson dj at david-web.co.uk
Sat Jul 30 23:17:17 CEST 2005


Hi all,

I'm using a Nebula DVB-T PCI card with the mt352 frontend [1] and am having 
problems with the card stopping sending data. I'm using the DVB drivers in 
kernel 2.6.13-rc4, which are very close to if not identical to those in the 
current dvb-kernel CVS.

I'm using mplayer as a viewer (I've tried with others too and get the same 
issue, so I'm confident this isn't a viewer bug) which starts up OK and I can 
watch TV. However after a random time, normally between 10 seconds and 10 
minutes, the card stops sending data and mplayer dies:

dvb_streaming_read, attempt N. 6 failed with errno 0 when reading 1640 bytes
dvb_streaming_read, attempt N. 5 failed with errno 0 when reading 1640 bytes
dvb_streaming_read, attempt N. 4 failed with errno 0 when reading 1640 bytes
dvb_streaming_read, attempt N. 3 failed with errno 0 when reading 1640 bytes
dvb_streaming_read, attempt N. 2 failed with errno 0 when reading 1640 bytes
dvb_streaming_read, attempt N. 1 failed with errno 0 when reading 1640 bytes
dvb_streaming_read, attempt N. 6 failed with errno 0 when reading 2048 bytes
dvb_streaming_read, attempt N. 5 failed with errno 0 when reading 2048 bytes
dvb_streaming_read, attempt N. 4 failed with errno 0 when reading 2048 bytes
dvb_streaming_read, attempt N. 3 failed with errno 0 when reading 2048 bytes
dvb_streaming_read, attempt N. 2 failed with errno 0 when reading 2048 bytes
dvb_streaming_read, attempt N. 1 failed with errno 0 when reading 2048 bytes
dvb_streaming_read, return 0 bytes
TS_PARSE: COULDN'T SYNC

As I'm watching TV, I'm getting lots of the following messages in demsg:

bt878(0): irq FDSR FBUS risc_pc=1fc66010
bt878(0): irq FBUS risc_pc=1fc66158
bt878(0): irq FBUS risc_pc=1fc66158
bt878(0): irq FBUS risc_pc=1fc66040
bt878(0): irq FBUS risc_pc=1fc66040
bt878(0): irq FBUS risc_pc=1fc66198
bt878(0): irq FBUS risc_pc=1fc661a0
bt878(0): irq FBUS risc_pc=1fc66080
bt878(0): irq FDSR FBUS risc_pc=1fc660b8
bt878(0): irq FBUS risc_pc=1fc66170
bt878(0): irq FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210
bt878(0): irq FDSR FBUS risc_pc=1fc66210

Then when the card stops sending data and mplayer dies, I get the following in 
dmesg:

bt878(0): IRQ lockup, cleared int mask

If I restart mplayer it opens the card fine and I can carry on where I left 
off - until it happens again.

Any advice would be greatfully received and I'd be more than happy to help 
debug this if it's a bug (as long as someone tells me how!).

Thanks in advance,
David.

[1] made to work using the code from this patch: 
http://www.linuxtv.org/pipermail/linux-dvb/2005-April/001479.html




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