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I'm trying to get audio working on a custom AM180x board. When I record audio and then play it back on a PC, the audio will skip back in time several times during a 10 second recording. However, if I put in delays (in the form of debugging spits to the console) in the function davinci_pcm_pointer, then audio recording starts working. So, it appears to be some sort of timing issue. Where is the timing of data transfer between the McASP and the audio codec set?
Thanks,
David
So, I've enable XRUN DEBUG and set its value at 3. Now, when I do a playback I get several XRUN dumps. Here's the text from the syslog:
root@am180x-evm:~# aplay --period-size=512 /usr/share/sounds/alsa/Front_Center.wav
Playing WAVE '/usr/share/sounds/alsa/Front_Center.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
underrun!!! (at least 417.453 ms long)
underrun!!! (at least 410.054 ms long)
root@am180x-evm:~# dmesg
ioctl+0x0/0x3c) from [<c00bdd4c>] (do_vfs_ioctl+0x570/0x5e0)
[<c00bd7dc>] (do_vfs_ioctl+0x0/0x5e0) from [<c00bde14>] (sys_ioctl+0x58/0x7c)
[<c00bddbc>] (sys_ioctl+0x0/0x7c) from [<c002efe0>] (ret_fast_syscall+0x0/0x2c)
r8:c002f164 r7:00000036 r6:00000000 r5:0002e6b8 r4:0002e668
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a1400 period_size=400
davinci-pcm: PCM trigger
davinci-mcasp davinci-mcasp.0: Shutting down McASP
XRUN: pcmC0D0p:0
Backtrace:
[<c0032698>] (dump_backtrace+0x0/0x10c) from [<c031bb74>] (dump_stack+0x18/0x1c)
r7:c7072000 r6:c7851600 r5:c7a4bc58 r4:00000000
[<c031bb5c>] (dump_stack+0x0/0x1c) from [<c025e450>] (xrun+0xc8/0xdc)
[<c025e388>] (xrun+0x0/0xdc) from [<c025edbc>] (snd_pcm_update_state+0xb4/0x120)
r6:0000678f r5:60000093 r4:0000678f
[<c025ed08>] (snd_pcm_update_state+0x0/0x120) from [<c025f4ac>] (snd_pcm_update_hw_ptr0+0x684/0x6e0)
r4:0000678f
[<c025ee28>] (snd_pcm_update_hw_ptr0+0x0/0x6e0) from [<c025f5a8>] (snd_pcm_period_elapsed+0xa0/0x158)
[<c025f508>] (snd_pcm_period_elapsed+0x0/0x158) from [<c026bf68>] (davinci_pcm_dma_irq+0xb8/0xc4)
r6:c7851600 r5:00000001 r4:c7a4a000
[<c026beb0>] (davinci_pcm_dma_irq+0x0/0xc4) from [<c00390e8>] (dma_irq_handler+0x154/0x1a0)
r7:00002068 r6:00002050 r5:00000001 r4:00000001
[<c0038f94>] (dma_irq_handler+0x0/0x1a0) from [<c0076324>] (handle_IRQ_event+0x2c/0xfc)
[<c00762f8>] (handle_IRQ_event+0x0/0xfc) from [<c0078880>] (handle_edge_irq+0x15c/0x1cc)
r7:0000000b r6:c7819b00 r5:c7a4a000 r4:c0418538
[<c0078724>] (handle_edge_irq+0x0/0x1cc) from [<c002e07c>] (asm_do_IRQ+0x7c/0xa0)
r8:00000001 r7:00000002 r6:00200800 r5:00000000 r4:0000000b
[<c002e000>] (asm_do_IRQ+0x0/0xa0) from [<c002ebec>] (__irq_svc+0x4c/0x9c)
Exception stack(0xc7a4bdf8 to 0xc7a4be40)
bde0: 00000001 0000077f
be00: 00005e00 60000013 00005681 c7072000 00000081 c7a4a000 c7851600 0000077f
be20: 0000017f c7a4be94 c70720ac c7a4be40 c025ff20 c025ffcc 60000013 ffffffff
r5:febfd000 r4:ffffffff
[<c025fda8>] (snd_pcm_lib_write1+0x0/0x430) from [<c02602b0>] (snd_pcm_lib_write+0x6c/0x78)
[<c0260244>] (snd_pcm_lib_write+0x0/0x78) from [<c025becc>] (snd_pcm_playback_ioctl1+0xc4/0x518)
r6:c7851600 r5:00000000 r4:00000000
[<c025be08>] (snd_pcm_playback_ioctl1+0x0/0x518) from [<c025c358>] (snd_pcm_playback_ioctl+0x38/0x3c)
r8:beeaf9fc r7:00000004 r6:400c4150 r5:c7a3a800 r4:00000000
[<c025c320>] (snd_pcm_playback_ioctl+0x0/0x3c) from [<c00bdd4c>] (do_vfs_ioctl+0x570/0x5e0)
[<c00bd7dc>] (do_vfs_ioctl+0x0/0x5e0) from [<c00bde14>] (sys_ioctl+0x58/0x7c)
[<c00bddbc>] (sys_ioctl+0x0/0x7c) from [<c002efe0>] (ret_fast_syscall+0x0/0x2c)
r8:c002f164 r7:00000036 r6:00000000 r5:0002e6b8 r4:0002e668
davinci-pcm: Prepare PCM
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a0000 period_size=400
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a0400 period_size=400
davinci-mcasp davinci-mcasp.0: Cancel delayed work
davinci-mcasp davinci-mcasp.0: Stream start
davinci-mcasp davinci-mcasp.0: Digital Mute
tlv320aic14k-codec 1-0040: Un-muting Codec
davinci-mcasp davinci-mcasp.0: End of preparations
davinci-pcm: PCM trigger
davinci-mcasp davinci-mcasp.0: Starting up McASP
PCM: Lost interrupts? (stream=0, delta=820, new_hw_ptr=820, old_hw_ptr=0)
Backtrace:
[<c0032698>] (dump_backtrace+0x0/0x10c) from [<c031bb74>] (dump_stack+0x18/0x1c)
r7:c7072000 r6:00000334 r5:c7072000 r4:00000000
[<c031bb5c>] (dump_stack+0x0/0x1c) from [<c025f3e4>] (snd_pcm_update_hw_ptr0+0x5bc/0x6e0)
[<c025ee28>] (snd_pcm_update_hw_ptr0+0x0/0x6e0) from [<c025f674>] (snd_pcm_update_hw_ptr+0x14/0x18)
[<c025f660>] (snd_pcm_update_hw_ptr+0x0/0x18) from [<c025fe84>] (snd_pcm_lib_write1+0xdc/0x430)
[<c025fda8>] (snd_pcm_lib_write1+0x0/0x430) from [<c02602b0>] (snd_pcm_lib_write+0x6c/0x78)
[<c0260244>] (snd_pcm_lib_write+0x0/0x78) from [<c025becc>] (snd_pcm_playback_ioctl1+0xc4/0x518)
r6:c7851600 r5:00000000 r4:00000000
[<c025be08>] (snd_pcm_playback_ioctl1+0x0/0x518) from [<c025c358>] (snd_pcm_playback_ioctl+0x38/0x3c)
r8:beeaf9fc r7:00000004 r6:400c4150 r5:c7a3a800 r4:00000000
[<c025c320>] (snd_pcm_playback_ioctl+0x0/0x3c) from [<c00bdd4c>] (do_vfs_ioctl+0x570/0x5e0)
[<c00bd7dc>] (do_vfs_ioctl+0x0/0x5e0) from [<c00bde14>] (sys_ioctl+0x58/0x7c)
[<c00bddbc>] (sys_ioctl+0x0/0x7c) from [<c002efe0>] (ret_fast_syscall+0x0/0x2c)
r8:c002f164 r7:00000036 r6:00000000 r5:0002e6b8 r4:0002e668
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a0800 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a0c00 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a1000 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a1400 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a1800 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a1c00 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a2000 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a2400 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a2800 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a2c00 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a3000 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a3400 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a3800 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a3c00 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a4000 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a4400 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a4800 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a4c00 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a5000 period_size=400
PCM: Lost interrupts? [Q] (stream=0, delta=23957, new_hw_ptr=33812, old_hw_ptr=9855)
Backtrace:
[<c0032698>] (dump_backtrace+0x0/0x10c) from [<c031bb74>] (dump_stack+0x18/0x1c)
r7:c7072000 r6:00008414 r5:60000093 r4:c7851600
[<c031bb5c>] (dump_stack+0x0/0x1c) from [<c025f3e4>] (snd_pcm_update_hw_ptr0+0x5bc/0x6e0)
[<c025ee28>] (snd_pcm_update_hw_ptr0+0x0/0x6e0) from [<c025f5a8>] (snd_pcm_period_elapsed+0xa0/0x158)
[<c025f508>] (snd_pcm_period_elapsed+0x0/0x158) from [<c026bf68>] (davinci_pcm_dma_irq+0xb8/0xc4)
r6:c7851600 r5:00000001 r4:c7a4a000
[<c026beb0>] (davinci_pcm_dma_irq+0x0/0xc4) from [<c00390e8>] (dma_irq_handler+0x154/0x1a0)
r7:00002068 r6:00002050 r5:00000001 r4:00000001
[<c0038f94>] (dma_irq_handler+0x0/0x1a0) from [<c0076324>] (handle_IRQ_event+0x2c/0xfc)
[<c00762f8>] (handle_IRQ_event+0x0/0xfc) from [<c0078880>] (handle_edge_irq+0x15c/0x1cc)
r7:0000000b r6:c7819b00 r5:c7a4a000 r4:c0418538
[<c0078724>] (handle_edge_irq+0x0/0x1cc) from [<c002e07c>] (asm_do_IRQ+0x7c/0xa0)
r8:00000001 r7:00000002 r6:00000800 r5:00000000 r4:0000000b
[<c002e000>] (asm_do_IRQ+0x0/0xa0) from [<c002ebec>] (__irq_svc+0x4c/0x9c)
Exception stack(0xc7a4bdf8 to 0xc7a4be40)
bde0: 00000001 000025fe
be00: 00005e00 60000013 00000081 c7072000 00000081 c7a4a000 c7851600 000025fe
be20: 0000017d c7a4be94 c7851600 c7a4be40 c025ff20 c025ffcc 60000013 ffffffff
r5:febfd000 r4:ffffffff
[<c025fda8>] (snd_pcm_lib_write1+0x0/0x430) from [<c02602b0>] (snd_pcm_lib_write+0x6c/0x78)
[<c0260244>] (snd_pcm_lib_write+0x0/0x78) from [<c025becc>] (snd_pcm_playback_ioctl1+0xc4/0x518)
r6:c7851600 r5:00000000 r4:00000000
[<c025be08>] (snd_pcm_playback_ioctl1+0x0/0x518) from [<c025c358>] (snd_pcm_playback_ioctl+0x38/0x3c)
r8:beeaf9fc r7:00000004 r6:400c4150 r5:c7a3a800 r4:00000000
[<c025c320>] (snd_pcm_playback_ioctl+0x0/0x3c) from [<c00bdd4c>] (do_vfs_ioctl+0x570/0x5e0)
[<c00bd7dc>] (do_vfs_ioctl+0x0/0x5e0) from [<c00bde14>] (sys_ioctl+0x58/0x7c)
[<c00bddbc>] (sys_ioctl+0x0/0x7c) from [<c002efe0>] (ret_fast_syscall+0x0/0x2c)
r8:c002f164 r7:00000036 r6:00000000 r5:0002e6b8 r4:0002e668
davinci-pcm: PCM trigger
davinci-mcasp davinci-mcasp.0: Shutting down McASP
XRUN: pcmC0D0p:0
Backtrace:
[<c0032698>] (dump_backtrace+0x0/0x10c) from [<c031bb74>] (dump_stack+0x18/0x1c)
r7:c7072000 r6:c7851600 r5:c7a4bc58 r4:00000000
[<c031bb5c>] (dump_stack+0x0/0x1c) from [<c025e450>] (xrun+0xc8/0xdc)
[<c025e388>] (xrun+0x0/0xdc) from [<c025edbc>] (snd_pcm_update_state+0xb4/0x120)
r6:00008414 r5:60000093 r4:00008414
[<c025ed08>] (snd_pcm_update_state+0x0/0x120) from [<c025f4ac>] (snd_pcm_update_hw_ptr0+0x684/0x6e0)
r4:00008414
[<c025ee28>] (snd_pcm_update_hw_ptr0+0x0/0x6e0) from [<c025f5a8>] (snd_pcm_period_elapsed+0xa0/0x158)
[<c025f508>] (snd_pcm_period_elapsed+0x0/0x158) from [<c026bf68>] (davinci_pcm_dma_irq+0xb8/0xc4)
r6:c7851600 r5:00000001 r4:c7a4a000
[<c026beb0>] (davinci_pcm_dma_irq+0x0/0xc4) from [<c00390e8>] (dma_irq_handler+0x154/0x1a0)
r7:00002068 r6:00002050 r5:00000001 r4:00000001
[<c0038f94>] (dma_irq_handler+0x0/0x1a0) from [<c0076324>] (handle_IRQ_event+0x2c/0xfc)
[<c00762f8>] (handle_IRQ_event+0x0/0xfc) from [<c0078880>] (handle_edge_irq+0x15c/0x1cc)
r7:0000000b r6:c7819b00 r5:c7a4a000 r4:c0418538
[<c0078724>] (handle_edge_irq+0x0/0x1cc) from [<c002e07c>] (asm_do_IRQ+0x7c/0xa0)
r8:00000001 r7:00000002 r6:00000800 r5:00000000 r4:0000000b
[<c002e000>] (asm_do_IRQ+0x0/0xa0) from [<c002ebec>] (__irq_svc+0x4c/0x9c)
Exception stack(0xc7a4bdf8 to 0xc7a4be40)
bde0: 00000001 000025fe
be00: 00005e00 60000013 00000081 c7072000 00000081 c7a4a000 c7851600 000025fe
be20: 0000017d c7a4be94 c7851600 c7a4be40 c025ff20 c025ffcc 60000013 ffffffff
r5:febfd000 r4:ffffffff
[<c025fda8>] (snd_pcm_lib_write1+0x0/0x430) from [<c02602b0>] (snd_pcm_lib_write+0x6c/0x78)
[<c0260244>] (snd_pcm_lib_write+0x0/0x78) from [<c025becc>] (snd_pcm_playback_ioctl1+0xc4/0x518)
r6:c7851600 r5:00000000 r4:00000000
[<c025be08>] (snd_pcm_playback_ioctl1+0x0/0x518) from [<c025c358>] (snd_pcm_playback_ioctl+0x38/0x3c)
r8:beeaf9fc r7:00000004 r6:400c4150 r5:c7a3a800 r4:00000000
[<c025c320>] (snd_pcm_playback_ioctl+0x0/0x3c) from [<c00bdd4c>] (do_vfs_ioctl+0x570/0x5e0)
[<c00bd7dc>] (do_vfs_ioctl+0x0/0x5e0) from [<c00bde14>] (sys_ioctl+0x58/0x7c)
[<c00bddbc>] (sys_ioctl+0x0/0x7c) from [<c002efe0>] (ret_fast_syscall+0x0/0x2c)
r8:c002f164 r7:00000036 r6:00000000 r5:0002e6b8 r4:0002e668
davinci_pcm: link=1, status=0x1
davinci-pcm: Prepare PCM
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a0000 period_size=400
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a0400 period_size=400
davinci-mcasp davinci-mcasp.0: Cancel delayed work
davinci-mcasp davinci-mcasp.0: Stream start
davinci-mcasp davinci-mcasp.0: Digital Mute
tlv320aic14k-codec 1-0040: Un-muting Codec
davinci-mcasp davinci-mcasp.0: End of preparations
davinci-pcm: PCM trigger
davinci-mcasp davinci-mcasp.0: Starting up McASP
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a0800 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a0c00 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a1000 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a1400 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a1800 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a1c00 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a2000 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a2400 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a2800 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a2c00 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a3000 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a3400 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a3800 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a3c00 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a4000 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a4400 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a4800 period_size=400
davinci_pcm: link=1, status=0x1
davinci_pcm: audio_set_dma_params_play channel = 81 dma_ptr = c79a4c00 period_size=400
davinci-pcm: PCM trigger
davinci-mcasp davinci-mcasp.0: Shutting down McASP
davinci-pcm: Freeing PCM hardware
davinci-pcm: Freeing PCM hardware
tlv320aic14k-codec 1-0040: Muting Codec
tlv320aic14k-codec 1-0040: Locking tlv320aic14k registers for read
tlv320aic14k-codec 1-0040: Reading Register 5B
tlv320aic14k-codec 1-0040: Register index 5A = 39
tlv320aic14k-codec 1-0040: Register index 5B = 30
tlv320aic14k-codec 1-0040: Register index 5C = 32
tlv320aic14k-codec 1-0040: Register index 5D = 02
tlv320aic14k-codec 1-0040: Un-locking tlv320aic14k registers
tlv320aic14k-codec 1-0040: Locking tlv320aic14k registers for write
tlv320aic14k-codec 1-0040: Writing Register 5B = 3f
tlv320aic14k-codec 1-0040: Reading Register 5B
tlv320aic14k-codec 1-0040: Register index 5A = 39
tlv320aic14k-codec 1-0040: Register index 5B = 3f
tlv320aic14k-codec 1-0040: Register index 5C = 32
tlv320aic14k-codec 1-0040: Register index 5D = 02
tlv320aic14k-codec 1-0040: Un-locking tlv320aic14k registers
davinci-mcasp davinci-mcasp.0: Shutting down the McASP
tlv320aic14k-codec 1-0040: Shutting Down Codec
tlv320aic14k-codec 1-0040: Requesting unlock for dac mutex
tlv320aic14k-codec 1-0040: Locking tlv320aic14k registers for read
tlv320aic14k-codec 1-0040: Reading Register 3A
tlv320aic14k-codec 1-0040: Register index 3A = 01
tlv320aic14k-codec 1-0040: Un-locking tlv320aic14k registers
tlv320aic14k-codec 1-0040: Setting Bias Level
tlv320aic14k-codec 1-0040: Locking tlv320aic14k registers for write
tlv320aic14k-codec 1-0040: Writing Register 3A = c1
tlv320aic14k-codec 1-0040: Reading Register 3A
tlv320aic14k-codec 1-0040: Register index 3A = c1
tlv320aic14k-codec 1-0040: Un-locking tlv320aic14k registers
davinci-pcm: Close PCM
It looks like to me that's its saying that the DMA interrupts stop and so it resets the McASP. Any thoughts on why that might be happening?
Thanks,
David
David,
I am facing a similar issue on DM8168 which have MCASP to connect audio interfaces.
Whether you have resolved this issue?
If resolved, can you please help us.
Regards,
Nitish James
James,
Even i am facing the similar issue after which i am hearing the delay in the audio.Are you also hearing the delay?Or did you find any fix to this issue?
Regards
Charan
Bump. I'm seeing the same issue. For some reason the hw_ptr stops advancing so the underrun condition is detected.
Has anyone found a solution to this problem?
Thanks,
-Craig
Craig,
The Audio underrun conditions can happen due to many reason.
1. Incorrect of insufficient hardware params passed from the applications side. (verify the buffer size and period size params)
2. High CPU utilization block the applications application thread may result in XRUN (make sure that the audio thread high privority and cpu not overloaded)
3. EDMA will not able to deliver the data in the proper intervals (change the edma priority )
Could you please provide more information about the setup and the hw_params passed from the app to get a better understanding of the issue ?
