i.MX8QXP PWM audio module

mosaddek_hossai — Wed, 09 Sep 2020 07:26:07 GMT

Hallo Nxp Community,

Currently I am integrating pwm sound module in i.MX8QXP custom board. I have used the driver from https://github.com/sasamy/imx-snd-pwm. This driver is also compatible with iMX8QXP.

Device Tree:
&pwm2 {
compatible = "fsl,imx-snd-pwm";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_pwm_audio_gpio>;
interrupts = <GIC_SPI 96 IRQ_TYPE_LEVEL_HIGH>;
status = "okay";
};

The driver has initialized the interface.

The Kernal panics when an audio is played. The error log is given below:

aplay -vv buttonclick.wav

[ 212.040466] BUG: scheduling while atomic: alsa-sink-snd_p/2324/0x00000004

[ 212.047829] SError Interrupt on CPU0, code 0xbf000002 -- SError

[ 212.047835] CPU: 0 PID: 2324 Comm: alsa-sink-snd_p Tainted: G W 4.19.35-1.1.0+g7aa22c77f19c #1

[ 212.047837] Hardware name: Freescale i.MX8QXP STHU (DT)

[ 212.047839] pstate: 40000005 (nZcv daif -PAN -UAO)

[ 212.047841] pc : imx_pcm_trigger+0x104/0x298

[ 212.047843] lr : imx_pcm_trigger+0xec/0x298

[ 212.047844] sp : ffff000021333c20

[ 212.047846] x29: ffff000021333c20 x28: ffff800834aa9800

[ 212.047852] x27: 0000000000000000 x26: 0000000000000000

[ 212.047859] x25: ffff80083477fa00 x24: ffff80083b5c1800

[ 212.047865] x23: ffff80083b620000 x22: 0000000000000080

[ 212.047872] x21: ffff80083b5c27b8 x20: 0000000000000000

[ 212.047876] x19: ffff80083b5c2780 x18: 00000000000003d5

[ 212.047882] x17: 0000000000000000 x16: 0000000000000000

[ 212.047889] x15: 0000000000000400 x14: 000000000000016d

[ 212.047895] x13: 0000000000000400 x12: 0000000000000400

[ 212.047901] x11: 0000000000000000 x10: 0000000000000910

[ 212.047908] x9 : ffff000021333980 x8 : ffff800834aaa170

[ 212.047914] x7 : ffff80083ff4c880 x6 : 00000000000001a8

[ 212.047918] x5 : 0000000000000000 x4 : 0000000000000000

[ 212.047924] x3 : 0000000000000000 x2 : 0000000000000000

[ 212.047929] x1 : ffff800834aa9800 x0 : ffff00001f8d0000

[ 212.047936] Kernel panic - not syncing: Asynchronous SError Interrupt

[ 212.047942] CPU: 0 PID: 2324 Comm: alsa-sink-snd_p Tainted: G W 4.19.35-1.1.0+g7aa22c77f19c #1

[ 212.047944] Hardware name: Freescale i.MX8QXP STHU (DT)

[ 212.047945] Call trace:

[ 212.047947] dump_backtrace+0x0/0x158

[ 212.047951] show_stack+0x14/0x20

[ 212.047953] dump_stack+0x90/0xb4

[ 212.047954] panic+0x120/0x27c

[ 212.047956] nmi_panic+0x6c/0x70

[ 212.047958] arm64_serror_panic+0x74/0x80

[ 212.047961] is_valid_bugaddr+0x0/0x8

[ 212.047963] el1_error+0x7c/0xdc

[ 212.047965] imx_pcm_trigger+0x104/0x298

[ 212.047969] snd_pcm_do_start+0x30/0x38

[ 212.047971] snd_pcm_action_single+0x44/0x98

[ 212.047972] snd_pcm_action+0x100/0x108

[ 212.047974] snd_pcm_action_lock_irq+0x38/0x60

[ 212.047978] snd_pcm_common_ioctl+0x7c8/0xec8

[ 212.047980] snd_pcm_ioctl+0x28/0x40

[ 212.047982] do_vfs_ioctl+0xb8/0x890

[ 212.047985] ksys_ioctl+0x78/0xa8

[ 212.047987] __arm64_sys_ioctl+0x1c/0x28

[ 212.047989] el0_svc_common+0x84/0xf0

[ 212.047993] el0_svc_handler+0x2c/0x80

[ 212.047994] el0_svc+0x8/0xc

[ 212.048012] SMP: stopping secondary CPUs

[ 212.048016] Kernel Offset: disabled

[ 212.048018] CPU features: 0x0,20802008

[ 212.048019] Memory Limit: none

[ 212.280168] ---[ end Kernel panic - not syncing: Asynchronous SError Interrupt ]---

Do you have any idea what is causing the problem, and How it can be handled? Please let me know a working solution, @igorpadykov @jonas_karlsson

Kind Regards,

Hossain

Re: i.MX8QXP PWM audio module

mosaddek_hossai — Wed, 09 Sep 2020 08:52:57 GMT

Fixed the bug.

Re: i.MX8QXP PWM audio module

mosaddek_hossai — Tue, 15 Sep 2020 10:54:13 GMT

Working Patch file for i.MX8qxp Audio PWM module. Change the Frequency and Period according to user specification.

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