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RobertCNelson / bb.org-overlays

Device Tree Overlays for bb.org boards
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HDMI audio osc disabled with standard overlay on BBBW #20

Closed acourdavault closed 6 years ago

acourdavault commented 6 years ago

Hello @RobertCNelson

I think i may have an issue with the overlays loaded at the startup of my BeagleBone Black

My issue is that HDMI works but not Audio (which i want to use with an external i2s DAC). I have an oscilloscope to debug the i2s protocol. I managed to get it to work (audio to i2s) a month ago but i cannot reproduce it.

What makes me think it s related to the overlays is that the Audio Oscillator Enable pin (gpio1.27) is lo. I check this with this tool: https://github.com/mvduin/bbb-pin-utils

audio osc enable                  27 fast    down 7 gpio 1.27 lo >>  clk_mcasp0 (mcasp0_pins)
P9.31 / hdmi audio clk           100 fast    down 0 asp 0 tx clk     mcasp@48038000 (mcasp0_pins)
P9.29 / hdmi audio fs            101 fast     up  0 asp 0 tx fs      mcasp@48038000 (mcasp0_pins)
P9.28 / hdmi audio data          103 fast    down 2 asp 0 data 2     mcasp@48038000 (mcasp0_pins)
P9.25 / audio osc                107 fast rx  up  0 asp 0 tx hclk    mcasp@48038000 (mcasp0_pins)

I read your comments on this issue: https://github.com/adafruit/adafruit-beaglebone-io-python/issues/127

As suggested in several places i updated my bootloader and the kernel.

Also following this note https://github.com/beagleboard/bb.org-overlays/issues/43 I tried to move to the "non TI" version of the OS. This did not change anything either.

Finally i followed your recommendation https://groups.google.com/forum/#!category-topic/beagleboard/_TdTH7oPEXE and updated the scripts, the channel back to TI

./version.sh

git:/opt/scripts/:[23650994e41b16bcf78253cde7d35a93664beeef]
eeprom:[A335BNLTBWA51645BBWG0838]
model:[TI_AM335x_BeagleBone_Black_Wireless]
dogtag:[BeagleBoard.org Debian Image 2017-08-31]
bootloader:[microSD-(push-button)]:[/dev/mmcblk0]:[U-Boot 2017.11-00002-g7b415acfc1]
bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot 2016.11-rc3-00002-g73df7f]
kernel:[4.9.63-ti-r77]
nodejs:[v6.11.2]
uboot_overlay_options:[enable_uboot_overlays=1]
uboot_overlay_options:[uboot_overlay_pru=/lib/firmware/AM335X-PRU-UIO-00A0.dtbo]
uboot_overlay_options:[enable_uboot_cape_universal=1]
pkg:[bb-cape-overlays]:[4.4.20170728.0-0rcnee1~stretch+20170728]
pkg:[bb-wl18xx-firmware]:[1.20170829-0rcnee1~stretch+20170829]
pkg:[firmware-ti-connectivity]:[20170823-1rcnee0~stretch+20170830]

Command Line arguments: I have also tried in uEnv.txt to add hdmi.audio=1 to the command line, this did not change anything.

As this may be important the screen resolution is (xrandr --verbose) 1024x768 (0x1b6) 0.000MHz *current

And looked at the overlays, The overlays loaded are here (dmesg | grep bone):

[    2.863659] bone_capemgr bone_capemgr: Baseboard: 'A335BNLT,BWA5,1645BBWG0838'
[    2.863688] bone_capemgr bone_capemgr: compatible-baseboard=ti,beaglebone-black - #slots=4
[    2.892097] bone_capemgr bone_capemgr: slot #0: No cape found
[    2.923056] bone_capemgr bone_capemgr: slot #1: No cape found
[    2.955727] bone_capemgr bone_capemgr: slot #2: No cape found
[    2.988056] bone_capemgr bone_capemgr: slot #3: No cape found
[    2.993934] bone_capemgr bone_capemgr: initialized OK.
[    7.406890] systemd[1]: Set hostname to <beaglebone>.

I think the issue is that GPIO 1. 27 is LO which desactivated the audio oscillator The question is how to turn it on

Why would the Overlays not activate HDMI audio.

I ve also looked at the cape-universal cape-universala cape-universaln but without success.

Do you have any suggestion of an overlay load error on this?

Thank you

EDIT, additional info Also I've checked the card is listed correctly in hdmi

debian@beaglebone:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Black [TI BeagleBone Black], device 0: davinci-mcasp.0-hdmi-hifi.0 hdmi-hifi.0-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
acourdavault commented 6 years ago

I wonder if it may be important to add something to turn on GPIO1.27, as I've check it s lo on the hardware

I've seen it in https://github.com/beagleboard/devicetree-source/blob/master/arch/arm/boot/dts/cape-boneblack-hdmi-00A0.dts, line 88 it s a PULLPUP but it s definitly not at 3.3V on my board

any advice?

RobertCNelson commented 6 years ago

Based on the dts, it should be low:

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/tree/arch/arm/boot/dts/am335x-boneblack.dts?h=v4.9.64#n75

Sorry, i don't have a hdmi-audio based device at work to test this.

Regards,

acourdavault commented 6 years ago

@RobertCNelson I see, thank you for your answer, Is this part of the ti channel of the OS?

Should I try to modify this overlay to set it?

When you say it 's low by default, is it because of this line:

        enable-gpios = <&gpio1 27 0>; /* BeagleBone Black Clk enable on GPIO1_27 */

that i should change to <&gpio1 27 1>;

Or would there be a non-intrusive way to set this value? i would definitely prefer another way

Thank you again

acourdavault commented 6 years ago

Hello @RobertCNelson

Thank you I found the issue the overlays are working fine, It's not possible to force this pin status,

However with the proper resolution CEA for my screen it gets to hi when sound is playing only and not at startup.

Sorry for the noise

jjghjjgh commented 6 years ago

Hello @acourdavault

I just saw in your previous post that you were able to connect audio DAC on BBB. I also want to enable audio DAC with i2s interface on BBB running the same kernel 4.9 as yours. I was trying to load BB-BONE-AUDI-02 overlay which is based on TLV320AIC3106 codec. May i know u also used tha same.If yes i had some doubts related to loading the same audio audio cape on new kernel 4.9. Please respond. waiting for your response. Thanks, Jithu