Hi,

I'm working with Linux 3.3 and the soc/codecs/rt5631.c driver in an OLPC XO-1.75 laptop. We are only getting silence when playing back sound.

I have added in some debug messages in soc-io.c and enabled DEBUG and VERBOSE_DEBUG in soc-dapm.c.

Here are boot messages: http://dev.laptop.org/~dsd/20120504/boot.log

At time X in the above log, I start "speaker-test -c 2 -t wav" and leave it running for the remainder of this test.

Here is the "amixer" output at this point: http://dev.laptop.org/~dsd/20120504/amixer-initial.txt

speaker-test seems happy but no audio can be heard :(

However, I have found that the following tweak to the sound controls will fix the left channel:

# amixer sset 'Left SPKVOL Mux' 'Vmid' # amixer sset 'Left SPKVOL Mux' 'SPKMIXL'

Note that the original value was SPKMIXL (see initial amixer output) so this should have had no effect. However, the result is that sound is now heard through the left channel. (A very similar sound control change will fix the right channel too)

While running these commands, the following kernel messages appear:

(amixer sset 'Left SPKVOL Mux' 'Vmid') read c = 0 read c = 0 read 10 = 606 read 10 = 606 read c = 0 read c = 0 read a = 0 read a = 0 read 6 = a080 read 1e = 88c0 read 1e = 88c0 read 1e = 88c0 read 1e = 88c0 read 6 = a080 read 20 = 88c0 read 20 = 88c0 read 20 = 88c0 read 20 = 88c0 read 24 = 3000 read 24 = 3000 read 24 = 3000 read 24 = 3000 read 4 = c0c0 read 4 = c0c0 read 4 = c0c0 read 4 = c0c0 read 4 = c0c0 read 4 = c0c0 read 2c = 0 read 2c = 0 read 4 = c0c0 read 6 = a080 read 2 = 4040 read 22 = 7700 read 22 = 7700 read e = 0 read 22 = 7700 read 22 = 7700 read e = 0 read 2c = 0 read 6 = a080 read 26 = 8404 read 26 = 8404 read 26 = 8404 read 2a = 6c00 read 2a = 6c00 read 1a = dfc0 read 1a = dfc0 read 1a = dfc0 read 1a = dfc0 read 1a = dfc0 read 1a = dfc0 read 1a = dfc0 read 1a = dfc0 read 1a = dfc0 read 1c = dfc0 read 1c = dfc0 read 1c = dfc0 read 1c = dfc0 read 1c = dfc0 read 1c = dfc0 read 1c = dfc0 read 1c = dfc0 read 1c = dfc0 read 2 = 4040 read 2 = 4040 read 14 = b0b0 read 14 = b0b0 read 14 = b0b0 read 14 = b0b0 read 14 = b0b0 read 14 = b0b0 read 14 = b0b0 read 14 = b0b0 read 4 = c0c0 read 6 = a080 read 2 = 4040 read 40 = 4e00 read 28 = d8d8 read 28 = d8d8 read 28 = d8d8 read 28 = d8d8 read 28 = d8d8 read 28 = d8d8 read 28 = d8d8 read 28 = d8d8 read 2c = 0 read 2a = 6c00 read 2a = 6c00 read 2c = 0 read 2a = 6c00 read 2a = 6c00 read 2 = 4040 read 2 = 4040 read 2 = 4040 read 2 = 4040 read 2 = 4040 read 2 = 4040 read 2 = 4040 read 2 = 4040 rt5631 0-001a: Marking Vmid dirty due to mux connection rt5631 0-001a: Marking Left SPKVOL Mux dirty due to mux change read 2 = 4040 write 2 = 40 (cached) read 2 = 40

(amixer sset 'Left SPKVOL Mux' 'SPKMIXL') read c = 0 read c = 0 read 10 = 606 read 10 = 606 read c = 0 read c = 0 read a = 0 read a = 0 read 6 = a080 read 1e = 88c0 read 1e = 88c0 read 1e = 88c0 read 1e = 88c0 read 6 = a080 read 20 = 88c0 read 20 = 88c0 read 20 = 88c0 read 20 = 88c0 read 24 = 3000 read 24 = 3000 read 24 = 3000 read 24 = 3000 read 4 = c0c0 read 4 = c0c0 read 4 = c0c0 read 4 = c0c0 read 4 = c0c0 read 4 = c0c0 read 2c = 0 read 2c = 0 read 4 = c0c0 read 6 = a080 read 2 = 40 read 22 = 7700 read 22 = 7700 read e = 0 read 22 = 7700 read 22 = 7700 read e = 0 read 2c = 0 read 6 = a080 read 26 = 8404 read 26 = 8404 read 26 = 8404 read 2a = 6c00 read 2a = 6c00 read 1a = dfc0 read 1a = dfc0 read 1a = dfc0 read 1a = dfc0 read 1a = dfc0 read 1a = dfc0 read 1a = dfc0 read 1a = dfc0 read 1a = dfc0 read 1c = dfc0 read 1c = dfc0 read 1c = dfc0 read 1c = dfc0 read 1c = dfc0 read 1c = dfc0 read 1c = dfc0 read 1c = dfc0 read 1c = dfc0 read 2 = 40 read 2 = 40 read 14 = b0b0 read 14 = b0b0 read 14 = b0b0 read 14 = b0b0 read 14 = b0b0 read 14 = b0b0 read 14 = b0b0 read 14 = b0b0 read 4 = c0c0 read 6 = a080 read 2 = 40 read 40 = 4e00 read 28 = d8d8 read 28 = d8d8 read 28 = d8d8 read 28 = d8d8 read 28 = d8d8 read 28 = d8d8 read 28 = d8d8 read 28 = d8d8 read 2c = 0 read 2a = 6c00 read 2a = 6c00 read 2c = 0 read 2a = 6c00 read 2a = 6c00 read 2 = 40 read 2 = 40 read 2 = 40 read 2 = 40 read 2 = 40 read 2 = 40 read 2 = 40 read 2 = 40 rt5631 0-001a: Marking Vmid dirty due to mux disconnection rt5631 0-001a: Marking SPKMIXL Mixer dirty due to mux connection rt5631 0-001a: Marking Left SPKVOL Mux dirty due to mux change rt5631 0-001a: Marking Left DAC dirty due to peer state change rt5631 0-001a: Marking Left DAC To Mixer dirty due to peer state change rt5631 0-001a: Marking DAC REF dirty due to peer state change rt5631 0-001a: Marking I2S dirty due to peer state change rt5631 0-001a: Marking PLL1 dirty due to peer state change rt5631 0-001a: Marking Left DAC_HP dirty due to peer state change rt5631 0-001a: Marking OUTMIXL Mixer dirty due to peer state change read 1a = dfc0 read 28 = d8d8 read 42 = 0 read 42 = 0 read 42 = 0 read 42 = 0 read 2 = 40 write 2 = 4040 (cached) read 3a = 1000 write 3a = 90c0 (cached) read 3a = 90c0 write 3a = 92c0 (cached) read 3b = c write 3b = 200c (cached) read 2 = 4040

So, changing these settings in a way that should have no effect seems to kick DAPM into applying quite a different config from the one initially applied. In particular, the register value register 0x3a (RT5631_PWR_MANAG_ADD1) is quite different from the one applied earlier, and I think this is the key to having playback working.

I've spent some time trying to get my head around the dapm code and see whats happening here, without much luck. If someone more experienced here could take a quick look at these messages and the dapm routes in rt5631.c for anything obvious, it would be much appreciated. Further debugging tips welcome too.

Thanks, Daniel