Andrew de Quincey wrote: > On Tuesday 04 July 2006 22:04, Oliver Endriss wrote: > > Andrew de Quincey wrote: > > > On Tuesday 04 July 2006 19:21, Oliver Endriss wrote: > > > > You might try the following: > > > > Copy the code of stop_ts_capture and start_ts_capture into your > > > > budget_fix_feed routine, replacing the calls to stop_ts_capture and > > > > start_ts_capture. > > > > > > > > Then disable lines of the copied code until you can identify the lines > > > > which are essential to fix the problem. > > > > > > > > That should give us a hint what is going on here. > > > > > > Sure, I reduced it to: > > > > > > saa7146_write(budget->dev, MC1, MASK_20); // DMA3 off > > > saa7146_write(budget->dev, MC1, (MASK_04 | MASK_20)); /* DMA3 on */ Ok, if we cannot fix it otherwise, your patch should execute exactly these 2 lines. There should be a FIXME comment explaining why the patch has been added. I still hope that we can find the real bug. ;-) > > Hm - this means that DMA3 has either not been started or is stuck. > > > > Does it make a difference if you add both lines at the end of > > start_ts_capture? > > Nope no difference. I'd already tried this by stopping+starting dvbtraffic > before I tuned... it doesn't help (I did try again tho adding the code to the > driver to make sure). > > To recap: > > 1) start dvbtraffic > > -- IRQs are received from the saa7146. > > 2) tune and lock > > -- The IRQs suddenly halt for no reason. > > 3) restart dvbtraffic > > -- IRQs start again and everything works fine thereafter. > > And all only the very first time DMA is started on cold boot. Very strange. I don't understand why it happens only once. Basically, it looks like an initialization problem. On the other hand, the data transfer was working and stops later. Imho this does not look like a saa7146 bug. A hw bug should show up anytime, not only once after booting. Did you check the budget->feeding stuff? At the first glance it looks strange to me that stop_ts_capture decrements budget->feeding unconditionally, while start_ts_capture checks before incrementing. Sorry, I will not be able to have a closer look at the code before the end of the next week... Oliver -- -------------------------------------------------------- VDR Remote Plugin available at http://www.escape-edv.de/endriss/vdr/ -------------------------------------------------------- _______________________________________________ linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
