On Thursday 22 May 2008 02:46:21 pm Mark Brown wrote:
On Thu, May 22, 2008 at 11:20:08AM -0500, Geoffrey Wossum wrote:
Check that all the required DAPM widgets are powered up by looking in /sys/bus/platform/devices/soc-audio/dapm_widget during playback - if they aren't then enabling DAPM_DEBUG in sound/soc/soc-dapm.c will make DAPM display information about the decisions it's making. If you can't see anything there could you please supply a register dump from during playback (availible in /sys/bus/platform/devices/soc-audio/codec_reg)?
Here's the DAPM widgets when I'm trying to play a file with aplay: Ext Spk: On Int Mic: Off Mic Bias: Off Boost Mixer: Off Mic Boost: Off Aux Boost: Off Mic PGA: Off Mono Out: Off SpkP Out: On SpkN Out: On Aux Input: Off ADC: Off DAC: On Mono Mixer: Off Speaker Mixer: On PM State: D0
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.
WM8510 registers 0: 0 1: 1ff 2: 1ff 3: 1ff 4: 10 5: 0 6: 151 7: 0 8: 0 9: 0 a: 0 b: ff c: 0 d: 0 e: 100 f: ff 10: 0 11: 0 12: 12c 13: 2c 14: 2c 15: 2c 16: 2c 17: 0 18: 32 19: 0 1a: 0 1b: 0 1c: 0 1d: 0 1e: 0 1f: 0 20: 38 21: b 22: 32 23: 0 24: 7 25: 2f 26: e7 27: 10a 28: 0 29: 0 2a: 0 2b: 0 2c: 3 2d: 10 2e: 0 2f: 0 30: 0 31: 2 32: 1 33: 0 34: 0 35: 0 36: 39 37: 0 38: 0 -snip- Bunch of bogus register reads equal to ffffffff after here.
Wish I had known about this register dump earlier today. I added code to do the same thing with debugfs.
@@ -597,14 +597,14 @@ struct snd_soc_codec_dai wm8510_dai = { .name = "WM8510 HiFi", .playback = { .stream_name = "Playback",
.channels_min = 1,.channels_max = 1,
.channels_min = 2,.channels_max = 2,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.
Thanks, --- Geoffrey