2016-09-30 21:19 GMT+02:00 Peter Ujfalusi <peter.ujfal...@ti.com>: > On 09/30/2016 06:06 PM, Bartosz Golaszewski wrote: >> >> Just ran a quick test with speaker-test -c2 -twav. Besides the fact >> that the left and right channels are inverted (I'm looking into that), >> I didn't notice any problems. Even at 1024x768 resolution, playing >> audio at the same time seems to work fine. >
Hi Peter > That's good to hear, but I think the priorities should be set: > LCDC and EDMA30TC1 to highest priority > EDMA30TC0 to priority 2 > > The 0TC0 is used by MMC and if you want to play a video you might need the > servicing TC to be higher priority then other masters. > > If audio playback would trigger sync losts in lcdc then we might need to move > 0TC1 to priority 1. > Did you mean "set EDMA31TC0 to priority 2"? EDMA30TC0 is already at the highest priority. Or did you mean that we need to lower the EDMA30TC0 priority? In that case: is 2 the correct value? EDMA31TC0 is used by mmc1 and its priority is 4. Shouldn't we set both to be the same? > I agree that LCDC priority needs to be higher, but I do wonder why the default > (5) is not working and if it is not working why it is 5... > > My guess is that the change in the PBBPR register is the one actually helping > here. > While it seems that lowering the EDMA30TC0 priority is indeed unnecessary, if I don't set the LCDC master to priority 0, I still get FIFO underflows even with the change in PBBPR. Thanks, Bartosz
