On Friday 07 July 2006 22:56, Oliver Endriss wrote: > 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. ;-) Yup. > > > 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. I don't see how that would break only on a cold boot though... I can reboot the machine as many times as I want after that and it works perfectly every time. > Sorry, I will not be able to have a closer look at the code before the > end of the next week... No probs - now I know about it, I can work around it for the moment. _______________________________________________ linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
