On 2013-02-14 13:07, Laurent Pinchart wrote: >> In many cases underflows are rather hard to debug and solve. There are >> things in the DSS hardware like FIFO thresholds and prefetch, and VRFB >> tile sizes, which can be changed (although unfortunately only by >> modifying the drivers). How they should be changed if a difficult >> question, though, and whether it'll help is also a question mark. > > Naive question here, instead of killing the overlay completely when an > underflow happens, couldn't the DSS driver somehow recover from that condition > by restarting whatever needs to be restarted ? Yes. Killing the overlay is just the safest choice. Presumably if an underflow happens, the problem is still there, and it'll just happen again if you re-enable the overlay. Obviously this is not always the case, as this problem at hand shows. There's much to improve with the DSS driver's error handling, though. I think first step would be to remove it totally from DSS, and move it to omapfb/omapdrm. It's a bit difficult to handle the errors at the lowest level. Tomi
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