[alsa-devel] Kernel Device Tree entries for simple-audio-card
Caleb Crome
caleb at crome.org
Tue Sep 29 01:46:43 CEST 2015
Hmm, the pinmux looks right, except that you have your TX set as an input.
You should have this:
mymcasp1_pins_default: mymcasp1_pins_default {
pinctrl-single,pins = <
0x1ac ( PIN_OUTPUT | MUX_MODE0 ) /* (A14) mcasp0_ahclkx.mcasp0_ahclkx */
0x190 ( PIN_INPUT | MUX_MODE0 ) /* (A13) mcasp0_aclkx.mcasp0_aclkx */
0x194 ( PIN_INPUT | MUX_MODE0 ) /* (B13) mcasp0_fsx.mcasp0_fsx */
0x198 ( PIN_INPUT | MUX_MODE0 ) /* (D12) mcasp0_axr0.mcasp0_axr0 */
0x19c ( PIN_OUTPUT | MUX_MODE2 ) /* (C12) mcasp0_ahclkr.mcasp0_axr2 */
>;
};
I'm not using a DTBO, but editing the DTB directly. Do you currently get
a sound card listed? i.e. does aplay -l show anything?
Also, did you disable your HDMI? You need to do that.
The thing you need to get is the MCLK a.k.a. the ahclkx going. After that,
all else should fall in line. Maybe. If ahclkx isn't going, then perhaps
it's a problem with enabling the mcasp, but your dts looks okay.
-Caleb
On Mon, Sep 28, 2015 at 3:34 PM, Rick Mann <rmann at latencyzero.com> wrote:
>
>> On Sep 28, 2015, at 15:22 , Caleb Crome <caleb at crome.org> wrote:
>>
>> On Mon, Sep 28, 2015 at 11:55 AM, Rick Mann <rmann at latencyzero.com>
wrote:
>>> That's very similar to what I have (I use ax40 & axr2). I also use
macsp0_ahclkx, but I'm not seeing a signal on it (or any other pin).
>>>
>>
>>
>>> Does this work for you with a 4.1.x kernel?
>>
>> Yes, it works for me. I assume your codec is master, do you see WCLK
>> and BCLK running? How about MCLK?
>>
>> Who is supposed to be driving MCLK in your case, the BBB or the codec?
>
> According to someone else, and as you assume above, the BBB should
generate the MCLK and the TLV generates WCLK and BCLK. That's
counterintuitive to me, but the configuration it's sending to the TLV for
register 0x08 is 0xC0, which sets the bits such that WCLK and BCLK are
outputs (master mode). I think MCLK is always an input on this device.
>
> (BTW, thanks for asking. In verifying what I just wrote, I learned a lot
about how it's supposed to work).
>
>> I see that you have the AHCLKX set to INPUT. This should probably
>> either be output (if the CPU is driving it), or not connected if the
>> codec is driving it.
>>
>>> 0x1ac (PIN_INPUT | MUX_MODE0) // P9_25 MCLK MCLK mcasp0_ahclkx
>
> Yeah, I changed that the other day:
>
>
https://github.com/JetForMe/podtique/blob/v1/bbb/cape/Podtique1/BB-ENABLE-PRU.dts
>
> pinctrl-single,pins = < // Hdr I2S
TLV SoC
> // ----- ----
---- -------------
> 0x190 (PIN_INPUT_PULLDOWN | MUX_MODE0) // P9_31 BCLK
BCLK mcasp0_aclkx
> 0x194 (PIN_INPUT_PULLDOWN | MUX_MODE0) // P9_29 WCLK
WCLK mcasp0_fsx
> 0x198 (PIN_INPUT_PULLDOWN | MUX_MODE0) // P9_30 RX
SDOUT mcasp0_axr0
> 0x19c (PIN_INPUT_PULLDOWN | MUX_MODE2) // P9_28 TX
SDIN mcasp0_axr2
> 0x1ac (PIN_OUTPUT_PULLDOWN | MUX_MODE0) // P9_25 MCLK
MCLK mcasp0_ahclkx
>>;
>
> The TRM indicates all the pins should have their receiver enabled, but I
decided to make MCLK an output.
>
> In all cases, NONE of the pins, including MCLK, changes state. BTW, when
I run speaker-test, it gets this far and hangs:
>
> $ speaker-test
>
> speaker-test 1.0.28
>
> Playback device is default
> Stream parameters are 48000Hz, S16_LE, 1 channels
> Using 16 octaves of pink noise
> Rate set to 48000Hz (requested 48000Hz)
> Buffer size range from 128 to 32768
> Period size range from 8 to 2048
> Using max buffer size 32768
> Periods = 4
> was set period_size = 2048
> was set buffer_size = 32768
> 0 - Front Left
>
> Which makes me think some internal sound data buffer is filling up, and
the write is blocking, and nothing is emptying the buffer because the McASP
isn't accepting bytes, and therefore not sending data out.
>
> If I interrupt speaker-test, it usually outputs this:
>
> ^CWrite error: -4,Interrupted system call
> xrun_recovery failed: -4,Interrupted system call
> Transfer failed: Interrupted system call
>
> Further reinforcing my theory. Which suggests something's still not right
for McASP0.
>
>
>
>
>>
>> -Caleb
>>
>>
>>
>>
>>>
>>>> On Sep 28, 2015, at 09:11 , Caleb Crome <caleb at crome.org> wrote:
>>>>
>>>> I used these pins to get the audio cape going.
>>>>
>>>> +/*
>>>> + * MCASP pin mapping
>>>> + * ball BBB
>>>> + * MCASP0_ACLKX A13 P9.31
>>>> + * MCASP0_AFSX B13 P9.29
>>>> + * MCASP0_AXR2 (mcasp OUT) C12 P9.28
>>>> + * MCASP0_AXR3 (mcasp IN) A14 P9.25
>>>> +*/
>>>>
>>>> mcasp_0_pins_default: mcasp_0_pins_default {
>>>> pinctrl-single,pins = <
>>>> 0x190 ( PIN_INPUT | MUX_MODE0 ) /* (A13) mcasp0_aclkx.mcasp0_aclkx
*/
>>>> 0x194 ( PIN_INPUT | MUX_MODE0 ) /* (B13) mcasp0_fsx.mcasp0_fsx */
>>>> 0x19c ( PIN_OUTPUT | MUX_MODE2 ) /* (C12) mcasp0_ahclkr.mcasp0_axr2
*/
>>>> 0x1ac ( PIN_INPUT | MUX_MODE2 ) /* (A14) mcasp0_ahclkx.mcasp0_axr3 */
>>>>> ;
>>>> };
>>>>
>>>> And importantly, the audio cape needs to use the AXR2 and AXR3 for my
use.
>>>>
>>>> +&mcasp0 {
>>>> + pinctrl-names = "default";
>>>> + pinctrl-0 = <&mcasp_0_pins_default>;
>>>> + status = "okay";
>>>> +
>>>> + op-mode = <0>; /* MCASP_IIS_MODE */
>>>> + tdm-slots = <8>;
>>>> + num-serializer = <16>;
>>>> + serial-dir = < /* 0: INACTIVE, 1: TX, 2: RX */
>>>> + 0 0 1 2
>>>> + 0 0 0 0
>>>> + 0 0 0 0
>>>> + 0 0 0 0
>>>> + >;
>>>> + tx-num-evt = <1>;
>>>> + rx-num-evt = <1>;
>>>> };
>>>>
>>>>
>>>> Hope that can be of some help.
>>>>
>>>>
>>>> -Caleb
>>>>
>>>>
>>>> On Sun, Sep 27, 2015 at 10:14 PM, Rick Mann <rmann at latencyzero.com>
wrote:
>>>>> Yeah, it turned out I needed a -cells = <0> on the mcasp0 peripheral.
>>>>>
>>>>> I've got it finding it and creating a sound card, and if I run
speaker-test, it sends a bunch of i2c commands to the codec (which aren't
quite right). But the McASP/IIS pins never change state, so, I've made
progress, but I'm still stuck.
>>>>>
>>>>> Latest DTBO:
>>>>>
>>>>>
https://github.com/JetForMe/podtique/blob/v1/bbb/cape/Podtique1/BB-ENABLE-PRU.dts
>>>>>
>>>>>> On Sep 27, 2015, at 14:52 , Caleb Crome <caleb at crome.org> wrote:
>>>>>>
>>>>>> I found that too. Check out the documentation here:
>>>>>>
http://lxr.free-electrons.com/source/Documentation/devicetree/bindings/sound/simple-card.txt
>>>>>>
>>>>>> You need to put in the #sound-dai-cells cell. Your value will
likely
>>>>>> be 0 for the codec, and maybe 1 for the SOC dai, but I"m not sure.
>>>>>>
>>>>>> Unfortunately, I don't really understand how it works.
>>>>>>
>>>>>> -Caleb
>>>>>>
>>>>>>
>>>>>> On Fri, Sep 25, 2015 at 10:57 PM, Rick Mann <rmann at latencyzero.com>
wrote:
>>>>>>> Hi. I've built a Beaglebone Black Cape that has, among other
things, a TI Audio CODEC on it (TLV320AIC3104). This is the same CODEC as
the BBB Audio Cape (http://elinux.org/CircuitCo:Audio_Cape_RevB), and it's
connected in almost the exact same way.
>>>>>>>
>>>>>>> The last few days I've been figuring out the Device Tree overlay
needed to get Linux (4.1.4) to recognize it. It's finding the device and
instantiating the low-level driver (tlv320aic3x-codec), although I'm not
sure at this point if it's actually talking to it (I have verified that
low-level i2c commands do work).
>>>>>>>
>>>>>>> But when it comes to the sound card setup, I'm having trouble
getting the Device Tree right. I'm hoping someone on this list can offer
some insight. The DT is here:
>>>>>>>
>>>>>>>
https://github.com/JetForMe/podtique/blob/master/bbb/cape/Podtique1/BB-ENABLE-PRU.dts
>>>>>>>
>>>>>>> And this is dmesg when I try to load that (note the name of my
overlay is BB-ENABLE-PRU, which is an artifact of the experimentation I've
been doing; it'll change to something more appropriate):
>>>>>>>
>>>>>>> [ 65.859275] bone_capemgr bone_capemgr: part_number
'BB-ENABLE-PRU', version 'N/A'
>>>>>>> [ 65.859318] bone_capemgr bone_capemgr: slot #4: override
>>>>>>> [ 65.859336] bone_capemgr bone_capemgr: Using override eeprom
data at slot 4
>>>>>>> [ 65.859355] bone_capemgr bone_capemgr: slot #4: 'Override Board
Name,00A0,Override Manuf,BB-ENABLE-PRU'
>>>>>>> [ 65.859488] bone_capemgr: bone_capemgr bone_capemgr: slot #4:
Requesting part number/version based 'BB-ENABLE-PRU-00A0.dtbo
>>>>>>> [ 65.859506] bone_capemgr: bone_capemgr bone_capemgr: slot #4:
Requesting firmware 'BB-ENABLE-PRU-00A0.dtbo' for board-name 'Override
Board Name', version '00A0'
>>>>>>> [ 65.861105] bone_capemgr: bone_capemgr bone_capemgr: slot #4:
dtbo 'BB-ENABLE-PRU-00A0.dtbo' loaded; converting to live tree
>>>>>>> [ 65.875618] gpio-of-helper ocp:gpio_helper: ready
>>>>>>> [ 65.876327] gpiolib_of: of_get_named_gpiod_flags: parsed 'gpio'
property of node '//fixedregulator at 1[0]' - status (0)
>>>>>>> [ 65.876619] core: lz-codec-reg: no parameters
>>>>>>> [ 65.876713] fixed: reg-fixed-voltage fixedregulator at 1:
lz-codec-reg supplying 0uV
>>>>>>> [ 65.883284] pruss_uio 4a300000.pruss: pins are not configured
from the driver
>>>>>>> [ 65.900080] bone_capemgr bone_capemgr: slot #4: dtbo
'BB-ENABLE-PRU-00A0.dtbo' loaded; overlay id #0
>>>>>>> [ 65.946254] gpiolib_of: of_get_named_gpiod_flags: parsed
'gpio-reset' property of node '/ocp/i2c at 4819c000/tlv320aic3104 at 0[0]' -
status (0)
>>>>>>> [ 65.946317] core: tlv320aic3x-codec 2-0018: Looking up
IOVDD-supply from device tree
>>>>>>> [ 65.946405] core: tlv320aic3x-codec 2-0018: Looking up
DVDD-supply from device tree
>>>>>>> [ 65.946468] core: tlv320aic3x-codec 2-0018: Looking up
AVDD-supply from device tree
>>>>>>> [ 65.946544] core: tlv320aic3x-codec 2-0018: Looking up
DRVDD-supply from device tree
>>>>>>> [ 65.946606] snd_soc_core: tlv320aic3x-codec 2-0018: codec
register 2-0018
>>>>>>> [ 65.946640] snd_soc_core: tlv320aic3x-codec 2-0018: ASoC: dai
register 2-0018 #1
>>>>>>> [ 65.946655] snd_soc_core: tlv320aic3x-codec 2-0018: ASoC:
Registered DAI 'tlv320aic3x-hifi'
>>>>>>> [ 65.946671] snd_soc_core: tlv320aic3x-codec 2-0018: ASoC:
Registered codec 'tlv320aic3x-codec.2-0018'
>>>>>>> [ 65.956491] //sound/simple-audio-card,cpu: could not get
#sound-dai-cells for /ocp/mcasp at 48038000
>>>>>>> [ 65.978759] snd_soc_core: davinci-mcasp 48038000.mcasp: ASoC:
dai register 48038000.mcasp #1
>>>>>>> [ 65.978795] snd_soc_core: davinci-mcasp 48038000.mcasp: ASoC:
Registered DAI '48038000.mcasp'
>>>>>>> [ 65.978954] snd_soc_core: davinci-mcasp 48038000.mcasp: ASoC:
Registered platform '48038000.mcasp'
>>>>>>> [ 66.012427] asoc-simple-card sound: parse error -22
>>>>>>> [ 66.042609] asoc-simple-card: probe of sound failed with error
-22
>>>>>>>
>>>>>>> Note the bit about "#sound-dai-cells". I'm not sure what's wrong
here, and it seems like it might be something in the distro-provided DTB,
not my own.
>>>>>>>
>>>>>>> aplay lists nothing (I think in part because I have yet to put in a
proper asound.conf file):
>>>>>>>
>>>>>>> # aplay -l
>>>>>>> aplay: device_list:268: no soundcards found...
>>>>>>>
>>>>>>> Can someone suggest some diagnostics I can do to see what the state
of things is? I'm just not sure what to look for. Thanks!
>>>>>>>
>>>>>>> --
>>>>>>> Rick Mann
>>>>>>> rmann at latencyzero.com
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Alsa-devel mailing list
>>>>>>> Alsa-devel at alsa-project.org
>>>>>>> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>>>>>> _______________________________________________
>>>>>> Alsa-devel mailing list
>>>>>> Alsa-devel at alsa-project.org
>>>>>> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>>>>>
>>>>>
>>>>> --
>>>>> Rick Mann
>>>>> rmann at latencyzero.com
>>>>>
>>>>>
>>>
>>>
>>> --
>>> Rick Mann
>>> rmann at latencyzero.com
>>>
>>>
>> _______________________________________________
>> Alsa-devel mailing list
>> Alsa-devel at alsa-project.org
>> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>
>
> --
> Rick Mann
> rmann at latencyzero.com
>
>
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