PROCESSOR-SDK-J722S: ti-linux 6.12 crashes when audio is enabled

Heiko Thiery

Tool/software:

Hi, I see the following kernel panic when the audio support in my device tree is enabled. I use the linux kernel bran ch ti-linux-6.12.y from git.ti.com/.../ti-linux-kernel.git.

[   12.431855] Internal error: synchronous external abort: 0000000096000010 [#1] PREEMPT SMP
[   12.443526] Modules linked in: cdns3 overlay cdns_usb_common snd_soc_simple_card snd_soc_simple_card_utils crct10dif_ce reset_gpio cfg80211 pci_endpoint_test panel_simple pvrsrvkm(O) cdns3_ti k3_j72xx_bandgap rti_wdt wave5 videobuf2_dma_contig at24 snd_soc_wm8904 tidss v4l2_mem2mem m_can_platform spi_omap2_mcspi videobuf2_v4l2 drm_dma_helper m_can videobuf2_memops bluetooth rtc_ti_k3 drm_display_helper videobuf2_common can_dev drm_kms_helper ecdh_generic videodev ecc rfkill mcrc64 sa2ul snd_soc_davinci_mcasp mc snd_soc_ti_udma rtc_pcf85063 snd_soc_ti_edma pwm_tiehrpwm snd_soc_ti_sdma omap_hwspinlock pwm_bl cryptodev(O) fuse drm drm_panel_orientation_quirks backlight ipv6
[   12.519461] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Tainted: G           O       6.12.22-ti-g47998d7b6023 #1
[   12.532799] Tainted: [O]=OOT_MODULE
[   12.538181] Hardware name: kontron Kontron SMARC-sAM67/Kontron SMARC-sAM67, BIOS 2025.07-rc3-g6c5788ff89 07/01/2025
[   12.552472] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[   12.561437] pc : xhci_irq+0x270/0x127c
[   12.567178] lr : xhci_irq+0x38/0x127c
[   12.572785] sp : ffff800080003e80
[   12.578045] x29: ffff800080003e80 x28: ffff61a40929b000 x27: ffff800081427f70
[   12.587163] x26: ffff61a4092b4284 x25: 0000000000000000 x24: ffff61a407215578
[   12.596260] x23: ffff800082a20490 x22: ffff61a4092b4c48 x21: ffff61a404ced060
[   12.605330] x20: 0000000000000000 x19: ffff61a4092b4240 x18: 0000000000000000
[   12.614369] x17: ffffb0a5bc48d000 x16: ffff800080000000 x15: ffff61a57ef51240
[   12.623383] x14: 0000000000000000 x13: 00000000000003cb x12: ffff61a57ef932c0
[   12.632360] x11: 0000000000000040 x10: ffff61a400012170 x9 : ffff61a400012168
[   12.641304] x8 : ffff61a402201b88 x7 : 0000000000000000 x6 : 0000000000000000
[   12.650235] x5 : ffff61a402201b60 x4 : 0000000000000000 x3 : 0000000000000078
[   12.659110] x2 : ffff61a40929b000 x1 : ffff61a407215500 x0 : 0000000000000078
[   12.667945] Call trace:
[   12.672027]  xhci_irq+0x270/0x127c
[   12.677033]  usb_hcd_irq+0x30/0x4c
[   12.681993]  __handle_irq_event_percpu+0x48/0x13c
[   12.688237]  handle_irq_event+0x4c/0xa8
[   12.693561]  handle_fasteoi_irq+0xa4/0x230
[   12.699101]  handle_irq_desc+0x40/0x58
[   12.704243]  generic_handle_domain_irq+0x1c/0x28
[   12.710228]  gic_handle_irq+0x54/0xd0
[   12.715210]  call_on_irq_stack+0x24/0x4c
[   12.720416]  do_interrupt_handler+0x80/0x8c
[   12.725859]  el1_interrupt+0x34/0x68
[   12.730665]  el1h_64_irq_handler+0x18/0x24
[   12.735988]  el1h_64_irq+0x64/0x68
[   12.740565]  default_idle_call+0x28/0x3c
[   12.745628]  do_idle+0x200/0x258
[   12.749953]  cpu_startup_entry+0x34/0x3c
[   12.754966]  kernel_init+0x0/0x1d4
[   12.759445]  start_kernel+0x554/0x6a0
[   12.764192]  __primary_switched+0x80/0x88
[   12.769275] Code: eb0202df 54002e80 f8606837 f9400adc (b94002f7)
[   12.776462] ---[ end trace 0000000000000000 ]---
[   12.782164] Kernel panic - not syncing: synchronous external abort: Fatal exception in interrupt
[   12.793182] SMP: stopping secondary CPUs
[   13.871260] SMP: failed to stop secondary CPUs 1
[   13.877016] Kernel Offset: 0x30ff418a0000 from 0xffff800080000000
[   13.884256] PHYS_OFFSET: 0xfff09e6480000000
[   13.889604] CPU features: 0x00,00000090,00200000,4200420b
[   13.896195] Memory Limit: none
[   13.900407] ---[ end Kernel panic - not syncing: synchronous external abort: Fatal exception in interrupt ]---


This is the device-tree overlay that I've applied when the crash happens:

&{/} {
 sound {
 compatible = "simple-audio-card";
 simple-audio-card,widgets =
 "Headphone", "Headphone Jack",
 "Line", "Line Out Jack",
 "Microphone", "Microphone Jack",
 "Line", "Line In Jack";
 simple-audio-card,routing =
 "Line Out Jack", "LINEOUTR",
 "Line Out Jack", "LINEOUTL",
 "Headphone Jack", "HPOUTR",
 "Headphone Jack", "HPOUTL",
 "IN1L", "Line In Jack",
 "IN1R", "Line In Jack",
 "Microphone Jack", "MICBIAS",
 "IN2L", "Microphone Jack",
 "IN2R", "Microphone Jack";
 simple-audio-card,mclk-fs = <256>;
 simple-audio-card,format = "i2s";
 simple-audio-card,bitclock-master = <&dailink0_master>;
 simple-audio-card,frame-master = <&dailink0_master>;

 simple-audio-card,cpu {
 sound-dai = <&mcasp0>;
 };

 dailink0_master: simple-audio-card,codec {
 sound-dai = <&wm8904>;
 clocks = <&audio_refclk0>;
 };
 };
};

&audio_refclk0 {
 status = "okay";
};

3 months ago

0 Jared McArthur 3 months ago

TI__Genius 17235 points

Hi Heiko,

It looks like your device tree is missing a few items.

Pinmux
Codec
McASP node

Can you look at the following device tree? The device, codec, and McASP node will be different, but the structure is the same.

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1501141/tda4vm-mcasp1-can-not-work/5776406#5776406

Best,
Jared

0 Heiko Thiery 3 months ago in reply to Jared McArthur

Prodigy 50 points

No, the nodes are present. Above I just showed the used overlay for the carrier board that has the sound parts (codec and jackets) installed. But in case you are right and there is something missing, the kernel should not crash. Or am I wrong?

pinmux: https://github.com/kontron/linux-smarc-sam67/blob/master/arch/arm64/boot/dts/ti/k3-am67a-kontron-sa67.dts#L661

codec: github.com/.../k3-am67a-kontron-sa67-ads2.dtso

mcasp: github.com/.../k3-am67a-kontron-sa67-ads2.dtso

BR,

Heiko

0 Jared McArthur 3 months ago in reply to Heiko Thiery

TI__Genius 17235 points

Hi Heiko,

The crashing is due to USB according to the log. Do you have any conflicts with the USB pins in your overlay?

Best,
Jared

0 Heiko Thiery 2 months ago in reply to Jared McArthur

Prodigy 50 points

Hi Jared,

I cannot see that there are any conflicts regarding audio and USB pins. By the way the same seems to happen when using the mainline kernel.

0 Jared McArthur 2 months ago in reply to Heiko Thiery

TI__Genius 17235 points

Hi Heiko,

Does this only occur when you enable the audio device tree? When you run without the device tree, does it boot properly?

Best,
Jared

0 Heiko Thiery 2 months ago in reply to Jared McArthur

Prodigy 50 points

Hi Jared,

the problem does not occur when the sound/audio node is disabled/removed.

0 Jared McArthur 2 months ago in reply to Heiko Thiery

TI__Genius 17235 points

Hi Heiko,

Is your audio_refclk0 programmed with the correct clock identifier?

https://software-dl.ti.com/tisci/esd/latest/5_soc_doc/j722s/clocks.html

Best,
Jared

0 Heiko Thiery 2 months ago in reply to Jared McArthur

Prodigy 50 points

Hi Jared,

yes this is programmed. Is is enabled by a patch that is already upstreamed: https://lore.kernel.org/all/20250618090724.1917731-1-mwalle@kernel.org/

Heiko

0 Jared McArthur 2 months ago in reply to Heiko Thiery

TI__Genius 17235 points

Hi Heiko,

I will try testing a device tree that’s similar and see if I can recreate your issue.

Best,
Jared

0 Heiko Thiery 2 months ago in reply to Jared McArthur

Prodigy 50 points

Hi Jared,

meanwhile we figured out that it happens when audio is enabled, plays sound and an USB3.0 hub or device is plugged in.

Heiko

0 Jared McArthur 2 months ago in reply to Heiko Thiery

TI__Genius 17235 points

Hi Heiko,

I haven't been able to recreate your issue. Following is the patch I used to switch to audio_refclk0 on the j722s-evm:

From 74f1bb9dcbc4c35648c1e324443f355498c899a7 Mon Sep 17 00:00:00 2001
From: Jared McArthur <j-mcarthur@ti.com>
Date: Thu, 10 Jul 2025 18:04:44 -0500
Subject: [PATCH 1/1] Add audio_refclk0 and switch codec's clock from
 audio_refclk1 to audio_refclk0

Signed-off-by: Jared McArthur <j-mcarthur@ti.com>
---
 arch/arm64/boot/dts/ti/k3-j722s-evm.dts   | 2 +-
 arch/arm64/boot/dts/ti/k3-j722s-main.dtsi | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
index 6169b2c9710f..e8b378634e0f 100644
--- a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
+++ b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts
@@ -227,7 +227,7 @@ simple-audio-card,cpu {
 
 		sound_master: simple-audio-card,codec {
 			sound-dai = <&tlv320aic3106>;
-			clocks = <&audio_refclk1>;
+			clocks = <&audio_refclk0>;
 		};
 	};
 
diff --git a/arch/arm64/boot/dts/ti/k3-j722s-main.dtsi b/arch/arm64/boot/dts/ti/k3-j722s-main.dtsi
index 25287bb68e86..b90360a64855 100644
--- a/arch/arm64/boot/dts/ti/k3-j722s-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j722s-main.dtsi
@@ -434,6 +434,15 @@ serdes_ln_ctrl: mux-controller@4080 {
 				<0x10 0x3>; /* SERDES1 lane0 select */
 	};
 
+	audio_refclk0: clock@82e0 {
+		compatible = "ti,am62-audio-refclk";
+		reg = <0x82e0 0x4>;
+		clocks = <&k3_clks 157 0>;
+		assigned-clocks = <&k3_clks 157 0>;
+		assigned-clock-parents = <&k3_clks 157 15>;
+		#clock-cells = <0>;
+	};
+
 	audio_refclk1: clock@82e4 {
 		compatible = "ti,am62-audio-refclk";
 		reg = <0x82e4 0x4>;
-- 
2.34.1

I also inserted a USB 3.0 flash drive:

root@j722s-evm:~# lsblk
NAME         MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
sda            8:0    1 58.6G  0 disk 
`-sda1         8:1    1 58.6G  0 part /run/media/test-usb-sda1
mtdblock0     31:0    0  512K  0 disk 
mtdblock1     31:1    0    2M  0 disk 
mtdblock2     31:2    0    4M  0 disk 
mtdblock3     31:3    0  256K  0 disk 
mtdblock4     31:4    0  256K  0 disk 
mtdblock5     31:5    0 55.8M  0 disk 
mtdblock6     31:6    0  256K  0 disk 
mmcblk0      179:0    0 29.6G  0 disk 
mmcblk0boot0 179:32   0 31.5M  1 disk 
mmcblk0boot1 179:64   0 31.5M  1 disk 
mmcblk1      179:96   0 14.8G  0 disk 
|-mmcblk1p1  179:97   0  128M  0 part /run/media/boot-mmcblk1p1
`-mmcblk1p2  179:98   0  8.9G  0 part /

Then I ran aplay:

root@j722s-evm:~# aplay -Dplughw:0,0 /dev/random
Playing raw data '/dev/random' : Unsigned 8 bit, Rate 8000 Hz, Mono

I didn't see any kernel panic. I also didn't see a kernel panic on boot.

Perhaps there's an issue in your hardware.

Best,
Jared

0 Heiko Thiery 1 month ago in reply to Jared McArthur

Prodigy 50 points

Hi, did you try to put in a USB 3.0 Hub or other device while audio is played?

0 Jared McArthur 1 month ago in reply to Heiko Thiery

TI__Genius 17235 points

Hi Heiko,

Heiko Thiery said:
Hi, did you try to put in a USB 3.0 Hub or other device while audio is played?

Yes. I noted it in the reply before yours. It's mounted to /run/media/test-usb-sda1

What modifications to SW and HW have you made?

Best,
Jared

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PROCESSOR-SDK-J722S: ti-linux 6.12 crashes when audio is enabled