How to check the sound out from "imx-hdmi-soc", HDMI audio? Will this sound available at any audio port in base board?

[akhilgopi]

Question:

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How to check the sound out from "imx-hdmi-soc", HDMI audio?
It seems ALSA driver on sound card2 is running by "# cat /proc/asound/card2/pcm0p/sub0/status" when checking with cactus player. Will this sound available at any audio port in base board?

Please see below for details...

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System Setup:
Target Board : iMX6Q Sabre AI
OS : Android M6
Other connections : 1. HDMI display with touch connected
2. Headphone connected to AUDIO OUT(3rd AV port)

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Available Sound Cards:

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root@sabreauto_6q:/ # cat /proc/asound/cards
0 [cs42888audio ]: cs42888-audio - cs42888-audio
cs42888-audio
1 [imxspdif ]: imx-spdif - imx-spdif
imx-spdif
2 [imxhdmisoc ]: imx-hdmi-soc - imx-hdmi-soc
imx-hdmi-soc

Available Sound Devices:
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root@sabreauto_6q:/ # cat /proc/asound/card0/
id pcm0c/ pcm0p/ pcm1c/ pcm1p/
root@sabreauto_6q:/ # cat /proc/asound/card1/
id pcm0c/
root@sabreauto_6q:/ # cat /proc/asound/card2/
id pcm0p/

Note: Total 3 sound cards and 3 Audio(ALSA) out devices are present.

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Attempts to test audio out devices:

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1. Using tinyplay utility sound out verified from AUDIO OUT port on base board.
# tinyplay test.wav -D 0 -d 0 --> Sound verified from AUDIO OUT port on base board.
Note : ALSA device 0 on Sound Card 0 is running to produce sound out.

#@

2. Attempt to run ALSA device 0 on Sound Card 2.
# tinyplay test.wav -D 2 -d 0 --> Sound out not coming out of Audio port on base board.

Note:
Sound card 2 is "imx-hdmi-soc" and its working can be verified by checking the status.
cat /proc/asound/card2/pcm0p/sub0/status
state: RUNNING
owner_pid : 516
trigger_time: 3491.260549416
tstamp : 3503.560340084
delay : 6144
avail : 0
avail_max : 5952
-----
hw_ptr : 589824
appl_ptr : 595968

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[igorpadykov · Accepted solution]

Hi Akhil

please check attached Linux Manual HDMI Unit test sect.15.4.2 Audio

Best regards
igor
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