When I execute audio playback using aplay via USB Audio device works fine at the first time from boot.
Once playback is ended / interrupted, then aplay is executed again, audio playback failed high probability with the log:
aplay: pcm_write:1737: write error: Input/output error
Once this situation occurs, the situation does not recover until the BeagleBone Black is rebooted.
I've never meet this with built-in Angstrom or Ubuntu 14.04LTS, so I think this is TI SDK specific fault.
Condition:
- BeagleBone Black RevB
- TI SDK: 07.00.00.00
- kernel configures
- enable IPv6, enable dynamic printk() support
# uname -a
Linux am335x-evm 3.12.10-ti2013.12.01 #2 Tue Jun 10 09:58:35 JST 2014 armv7l GNU/Linux
- BeagleBone Black is powered via AC adapter.
- USB Audio device:
- Roland UA-30 (Bus powered)
- I've checked some other USB Audio devices, but the result is the same.
Steps for reproduction:
- Connect USB Audio device before power on the BealgeBone Black.
(does not depend whether the USB audio device is connected before / after the boot)
- Execute aplay like:
# aplay -D hw:0,0 tmp.wav
- Sound playback is successfully executed.
- Wait until playback is ended or terminate aplay by Ctrl-C.
- Execute aplay again.
Result:
- No sounds from USB audio device.
- After 10 or more seconds, aplay is terminated with the following log.
aplay: pcm_write:1737: write error: Input/output error
- The following log is displayed in dmesg.
[ 126.021612] ALSA sound/core/pcm_lib.c:1945 playback write error (DMA or IRQ trouble?)
- When I terminate aplay by Ctrl-C during the situation, sometime the following messages are displayed.
[ 127.882758] ------------[ cut here ]------------
[ 127.890291] WARNING: CPU: 0 PID: 1448 at drivers/dma/cppi41.c:605 cppi41_dma_control+0x29c/0x2e4()
[ 127.899688] Modules linked in: g_mass_storage usb_f_mass_storage libcomposite configfs snd_usb_audio snd_hwdep snd_usbmidi_lib snd_soc_omap snd_pcm_dmaengine snd_rawmidi snd_soc_core regmap_spi snd_compress musb_dsps snd_pcm musb_hdrc snd_timer snd soundcore snd_page_alloc musb_am335x
[ 127.926228] CPU: 0 PID: 1448 Comm: aplay Tainted: G W O 3.12.10-ti2013.12.01 #1
[ 127.934622] Backtrace:
[ 127.937197] [<c0017880>] (dump_backtrace+0x0/0x10c) from [<c0017a1c>] (show_stack+0x18/0x1c)
[ 127.946046] r6:c02f4dfc r5:00000009 r4:00000000 r3:00000000
[ 127.952000] [<c0017a04>] (show_stack+0x0/0x1c) from [<c059e9fc>] (dump_stack+0x20/0x28)
[ 127.960405] [<c059e9dc>] (dump_stack+0x0/0x28) from [<c0046d08>] (warn_slowpath_common+0x70/0x90)
[ 127.969716] [<c0046c98>] (warn_slowpath_common+0x0/0x90) from [<c0046d4c>] (warn_slowpath_null+0x24/0x2c)
[ 127.979748] r8:0000003c r7:00000018 r6:00000051 r5:dba7dc00 r4:dba7c4c0
[ 127.986798] [<c0046d28>] (warn_slowpath_null+0x0/0x2c) from [<c02f4dfc>] (cppi41_dma_control+0x29c/0x2e4)
[ 127.996881] [<c02f4b60>] (cppi41_dma_control+0x0/0x2e4) from [<bf037d74>] (cppi41_dma_channel_abort+0xc4/0x130 [musb_hdrc])
[ 128.008586] [<bf037cb0>] (cppi41_dma_channel_abort+0x0/0x130 [musb_hdrc]) from [<bf033740>] (musb_cleanup_urb+0x48/0xf8 [musb_hdrc])
[ 128.021080] r8:dbe4c010 r7:dc7fa7f4 r6:ddb880c0 r5:e09e0da0 r4:dbe4ca90r3:bf037cb0
[ 128.029338] [<bf0336f8>] (musb_cleanup_urb+0x0/0xf8 [musb_hdrc]) from [<bf033900>] (musb_urb_dequeue+0x110/0x124 [musb_hdrc])
[ 128.041216] [<bf0337f0>] (musb_urb_dequeue+0x0/0x124 [musb_hdrc]) from [<c03e1c20>] (unlink1+0x34/0x10c)
[ 128.051165] [<c03e1bec>] (unlink1+0x0/0x10c) from [<c03e3184>] (usb_hcd_unlink_urb+0x60/0x7c)
[ 128.060112] [<c03e3124>] (usb_hcd_unlink_urb+0x0/0x7c) from [<c03e3b08>] (usb_unlink_urb+0x34/0x50)
[ 128.069598] r7:ddf76960 r6:ddf74000 r5:ddf74000 r4:00000001
[ 128.075576] [<c03e3ad4>] (usb_unlink_urb+0x0/0x50) from [<bf0cf820>] (deactivate_urbs+0xe0/0x10c [snd_usb_audio])
[ 128.086359] [<bf0cf740>] (deactivate_urbs+0x0/0x10c [snd_usb_audio]) from [<bf0d0ac8>] (snd_usb_endpoint_stop+0x38/0x78 [snd_usb_audio])
[ 128.099246] [<bf0d0a90>] (snd_usb_endpoint_stop+0x0/0x78 [snd_usb_audio]) from [<bf0d8760>] (stop_endpoints+0x78/0x90 [snd_usb_audio])
[ 128.111922] r5:00000000 r4:dc7cf010
[ 128.115703] [<bf0d86e8>] (stop_endpoints+0x0/0x90 [snd_usb_audio]) from [<bf0d88c0>] (snd_usb_substream_playback_trigger+0x94/0xb8 [snd_usb_audio])
[ 128.129563] r5:dc7cf800 r4:dc7cf010
[ 128.133372] [<bf0d882c>] (snd_usb_substream_playback_trigger+0x0/0xb8 [snd_usb_audio]) from [<bf058fb0>] (snd_pcm_do_stop+0x5c/0x60 [snd_pcm])
[ 128.146777] r4:bf061f38 r3:bf0d882c
[ 128.150555] [<bf058f54>] (snd_pcm_do_stop+0x0/0x60 [snd_pcm]) from [<bf058c68>] (snd_pcm_action_single+0x40/0x80 [snd_pcm])
[ 128.162253] [<bf058c28>] (snd_pcm_action_single+0x0/0x80 [snd_pcm]) from [<bf058cd4>] (snd_pcm_action+0x2c/0x30 [snd_pcm])
[ 128.173834] r7:00000000 r6:b6e8f4c0 r5:dc7cd780 r4:dc7cf800
[ 128.179805] [<bf058ca8>] (snd_pcm_action+0x0/0x30 [snd_pcm]) from [<bf058cf4>] (snd_pcm_stop+0x1c/0x24 [snd_pcm])
[ 128.190592] [<bf058cd8>] (snd_pcm_stop+0x0/0x24 [snd_pcm]) from [<bf058d54>](snd_pcm_drop+0x58/0xa0 [snd_pcm])
[ 128.201198] [<bf058cfc>] (snd_pcm_drop+0x0/0xa0 [snd_pcm]) from [<bf05a22c>](snd_pcm_common_ioctl1+0x810/0xcac [snd_pcm])
[ 128.212779] r4:dc7cf800 r3:00004143
[ 128.216559] [<bf059a1c>] (snd_pcm_common_ioctl1+0x0/0xcac [snd_pcm]) from [<bf05ab8c>] (snd_pcm_playback_ioctl1+0x48/0x464 [snd_pcm])
[ 128.229175] [<bf05ab44>] (snd_pcm_playback_ioctl1+0x0/0x464 [snd_pcm]) from [<bf05afdc>] (snd_pcm_playback_ioctl+0x34/0x40 [snd_pcm])
[ 128.241759] r6:00004143 r5:00000004 r4:00005452
[ 128.246630] [<bf05afa8>] (snd_pcm_playback_ioctl+0x0/0x40 [snd_pcm]) from [<c00e0ee0>] (do_vfs_ioctl+0x84/0x578)
[ 128.257306] [<c00e0e5c>] (do_vfs_ioctl+0x0/0x578) from [<c00e1448>] (SyS_ioctl+0x74/0x84)
[ 128.265898] [<c00e13d4>] (SyS_ioctl+0x0/0x84) from [<c0014660>] (ret_fast_syscall+0x0/0x30)
[ 128.274656] ---[ end trace f43ff5ffe4182eda ]---
Additional information:
- arecord works fine with the same operation on TI SDK 07.00.00.00.
- aplay works fine with build-in Angstrom Linux and Ubuntu 14.04 LTS.
- I've tried another ALSA playback application: http://equalarea.com/paul/alsa-audio.html (A Minimal Playback Program), but the result is the same.
- The application works until snd_pcm_writei() without error response of the APIs.
- snd_pcm_writei() loop is executed 16 times, then the application stacks.
