On Thu, May 22, 2008 at 02:57:41PM -0500, Geoffrey Wossum wrote:
Looks like it should work to me. Note that I do hear a pop from the speaker the first time I try to play a file. Here's a dump of the registers while I'm trying to play a file with aplay. I'm combing through them right now to see if I can find anything that looks off.
Yes, it looks like the output paths are OK from the DAPM point of view.
Wish I had known about this register dump earlier today. I added code to do the same thing with debugfs.
I'll have a look at it at some point, but not right now :) . I should also have asked you if you could post your machine driver - if you'd rather post it off-list that'd be fine.
I'll need to check this out in more detail - the WM8510 is a mono codec so it can only play one channel.
Not sure about this either, since I can't get it to play anything yet. But it looks from the WM8510 data sheet that even though the WM8510 is mono, it expects a stereo I2S stream, and just ignores one of the channels based on the value of DACLRSWAP register bit.
Indeed, the main thing I need to check is to confirm what is normally done with mono channels - in any case, the codec should at least make some noise providing the rates are correct and there's stereo data.
I take it the digital audio looks fine with a scope - clocks at the correct rate, sensible looking data and so on?