I've been at this for weeks and I'm still unable to get linux to work correctly with my TI codec. This is on a Beaglebone Black running a 4.1.4 kernel (later versions are worse). I've tried multiple versions of the kernel trying to narrow it down. I keep coming back to 4.1.4 as the most recent that at least generates some audio clocks.

The AM335x mcasp0 should be speaking i2s with the tlv320aic3104.

I have my own build from source of the BBB 4.1.4-ti-r9 release (mainline plus TI plus Beaglebone stuff). I've sprinkled some logging around the audio drivers, but so far I don't see much, and I really don't understand how all the pieces fit together.

One thing I found with my logging is the mcasp MCLK (AHCLKXDIV) is never set. I have logging calls in __davinci_mcasp_set_clkdiv() (sound/soc/davinci/davinci-mcasp.c), which is the only code I could find that sets the McASP clock, and it's never called. I tried to use devmem2 to read the registers in the SoC to see if they were set correctly, but I just get a bus error (other reads do work).

Errors in dmesg when I load the device tree overlay for my cape suggest I still don't have something configured correctly (see below).

I'd sure appreciate any insight into these latest issues. Thanks!

Symptoms:

MCLK should be 12 MHz, but is 24.00 MHz. Buffer underflows when running speaker-test.

Errors to console upon loading cape:

[ 38.502299] davinci_evm ocp:sound: ASoC: CPU DAI (null) not registered [ 38.517917] davinci_evm ocp:sound: snd_soc_register_card failed (-517) [ 38.530425] davinci_evm ocp:sound: ASoC: CPU DAI (null) not registered [ 38.536996] davinci_evm ocp:sound: snd_soc_register_card failed (-517) [ 38.564279] davinci_evm ocp:sound: ASoC: DAPM unknown pin MONO_LOUT

dmesg upon loading cape overlay (https://github.com/JetForMe/podtique/blob/v1/bbb/cape/Podtique1/BB-ENABLE-PR...):

[ 568.323587] bone_capemgr bone_capemgr: part_number 'BB-ENABLE-PRU', version 'N/A' [ 568.323629] bone_capemgr bone_capemgr: slot #4: override [ 568.323646] bone_capemgr bone_capemgr: Using override eeprom data at slot 4 [ 568.323663] bone_capemgr bone_capemgr: slot #4: 'Override Board Name,00A0,Override Manuf,BB-ENABLE-PRU' [ 568.323804] bone_capemgr:capemgr_load_slot:1148: bone_capemgr bone_capemgr: slot #4: Requesting part number/version based 'BB-ENABLE-PRU-00A0.dtbo [ 568.323825] bone_capemgr:capemgr_load_slot:1162: bone_capemgr bone_capemgr: slot #4: Requesting firmware 'BB-ENABLE-PRU-00A0.dtbo' for board-name 'Override Board Name', version '00A0' [ 568.330369] bone_capemgr:capemgr_load_slot:1171: bone_capemgr bone_capemgr: slot #4: dtbo 'BB-ENABLE-PRU-00A0.dtbo' loaded; converting to live tree [ 568.341685] gpio-of-helper ocp:gpio_helper: ready [ 568.344695] bone_capemgr bone_capemgr: slot #4: dtbo 'BB-ENABLE-PRU-00A0.dtbo' loaded; overlay id #0 [ 568.387640] **** RLM davinci-evm.c:480: RLM: clock rate: 12000000 [ 568.387695] snd_soc_core:soc_bind_dai_link:938: davinci_evm ocp:sound: ASoC: binding TLV320AIC3X at idx 0 [ 568.387712] davinci_evm ocp:sound: ASoC: CPU DAI (null) not registered [ 568.394284] davinci_evm ocp:sound: snd_soc_register_card failed (-517) [ 568.410560] snd_soc_core:snd_soc_register_codec:3064: tlv320aic3x-codec 2-0018: codec register 2-0018 [ 568.410614] snd_soc_core:snd_soc_register_dais:2590: tlv320aic3x-codec 2-0018: ASoC: dai register 2-0018 #1 [ 568.410633] snd_soc_core:snd_soc_register_dais:2634: tlv320aic3x-codec 2-0018: ASoC: Registered DAI 'tlv320aic3x-hifi' [ 568.410653] snd_soc_core:snd_soc_register_codec:3138: tlv320aic3x-codec 2-0018: ASoC: Registered codec 'tlv320aic3x-codec.2-0018' [ 568.421529] **** RLM davinci-evm.c:480: RLM: clock rate: 12000000 [ 568.421588] snd_soc_core:soc_bind_dai_link:938: davinci_evm ocp:sound: ASoC: binding TLV320AIC3X at idx 0 [ 568.421605] davinci_evm ocp:sound: ASoC: CPU DAI (null) not registered [ 568.431455] **** RLM davinci-mcasp.c:1734: davinci_mcasp_probe [ 568.431507] base:of_property_match_string:1398: comparing tx with tx [ 568.431544] base:of_property_match_string:1398: comparing rx with tx [ 568.431555] base:of_property_match_string:1398: comparing rx with rx [ 568.431608] base:of_property_match_string:1398: comparing common with tx [ 568.431621] base:of_property_match_string:1398: comparing common with rx [ 568.431633] base:of_property_match_string:1398: comparing rx with tx [ 568.431643] base:of_property_match_string:1398: comparing rx with rx [ 568.434643] base:of_property_match_string:1398: comparing tx with tx [ 568.437971] davinci_evm ocp:sound: snd_soc_register_card failed (-517) [ 568.446651] snd_soc_core:snd_soc_register_dais:2590: davinci-mcasp 48038000.mcasp: ASoC: dai register 48038000.mcasp #1 [ 568.446682] snd_soc_core:snd_soc_register_dais:2634: davinci-mcasp 48038000.mcasp: ASoC: Registered DAI '48038000.mcasp' [ 568.446840] snd_soc_core:snd_soc_add_platform:2892: davinci-mcasp 48038000.mcasp: ASoC: Registered platform '48038000.mcasp' [ 568.450046] **** RLM davinci-evm.c:480: RLM: clock rate: 12000000 [ 568.450100] snd_soc_core:soc_bind_dai_link:938: davinci_evm ocp:sound: ASoC: binding TLV320AIC3X at idx 0 [ 568.450425] snd_soc_core:snd_soc_dapm_new_dai_widgets:3494: tlv320aic3x-codec 2-0018: ASoC: adding Playback widget [ 568.450448] snd_soc_core:snd_soc_dapm_new_dai_widgets:3513: tlv320aic3x-codec 2-0018: ASoC: adding Capture widget [ 568.450995] snd_soc_core:soc_probe_link_dais:1334: davinci_evm ocp:sound: ASoC: probe Podtique DaVinci EVM dai link 0 late -2 [ 568.451015] snd_soc_core:soc_probe_link_dais:1334: davinci_evm ocp:sound: ASoC: probe Podtique DaVinci EVM dai link 0 late -1 [ 568.451030] snd_soc_core:soc_probe_link_dais:1334: davinci_evm ocp:sound: ASoC: probe Podtique DaVinci EVM dai link 0 late 0 [ 568.451045] snd_soc_core:soc_probe_link_dais:1334: davinci_evm ocp:sound: ASoC: probe Podtique DaVinci EVM dai link 0 late 1 [ 568.451059] snd_soc_core:soc_probe_link_dais:1334: davinci_evm ocp:sound: ASoC: probe Podtique DaVinci EVM dai link 0 late 2 [ 568.451099] davinci_evm ocp:sound: ASoC: DAPM unknown pin MONO_LOUT [ 568.465530] snd_soc_core:soc_new_pcm:2510: davinci_evm ocp:sound: ASoC: registered pcm #0 AIC3X tlv320aic3x-hifi-0 [ 568.466155] davinci_evm ocp:sound: tlv320aic3x-hifi <-> 48038000.mcasp mapping ok [ 568.466185] snd_soc_core:snd_soc_dapm_link_dai_widgets:3570: tlv320aic3x-codec 2-0018: Right ADC -> Capture [ 568.466206] snd_soc_core:snd_soc_dapm_link_dai_widgets:3570: tlv320aic3x-codec 2-0018: Left ADC -> Capture [ 568.466226] snd_soc_core:snd_soc_dapm_link_dai_widgets:3570: tlv320aic3x-codec 2-0018: Playback -> Right DAC [ 568.466241] snd_soc_core:snd_soc_dapm_link_dai_widgets:3570: tlv320aic3x-codec 2-0018: Playback -> Left DAC

upon starting speaker-test:

[ 572.786071] snd_soc_core:soc_pcm_open:535: ASoC: tlv320aic3x-hifi <-> 48038000.mcasp info: [ 572.786103] snd_soc_core:soc_pcm_open:536: ASoC: rate mask 0x7fe [ 572.786114] snd_soc_core:soc_pcm_open:538: ASoC: min ch 2 max ch 2 [ 572.786126] snd_soc_core:soc_pcm_open:540: ASoC: min rate 8000 max rate 96000 [ 572.841514] davinci-mcasp 48038000.mcasp: Transmit buffer underflow ...repeated [ 574.087162] davinci-mcasp 48038000.mcasp: Transmit buffer underflow [ 579.135283] snd_soc_core:close_delayed_work:602: TLV320AIC3X: ASoC: pop wq checking: Playback status: inactive waiting: yes