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2406411_en-US
2406411_en-US
- CPU: NXP i.MX6 (Custom Board)
- Audio Codec: WM8962
- OS / Build System: Linux (3.0.35) / ALSA Framework
Hello,
We are using a WM8962B audio codec with an i.MX6 platform, and we have an intermittent no-audio issue during boot.
When the issue occurs:
- MCLK is present, but BCLK and LRCLK stop.
- Audio playback does not recover BCLK/LRCLK.
- ALSA shows the PCM state as RUNNING, but hw_ptr remains 0.
Could you please advise:
1. Is there any known issue with WM8962 + i.MX6 where MCLK is present but BCLK/LRCLK stop intermittently during boot?
2. Are there any relevant fixes in newer NXP BSP versions, such as Linux 3.0.101 or 3.10.17, compared with the older WM8962 driver?
3. Could this be related to the WM8962 power-up/POR sequence or register-cache synchronization?
Thank you.
Hi @Kun1
The 3.0.35 kernel is too old. I looked up the internal fixes related to the WM8962 and confirmed that issues related to SYSCLK_SRC, MCLK, clock rate, and power supply were fixed in 3.10.17.
You can download imx_3.10.17_1.0.1_ga_caf and try incorporating these commits: 6cbcb7463a3, 4e8cd5f661d, e4dd76788c7, 9d40e5582c9, 5539a102882, 943248a5d07
7f570b0a8dc 346f1d40833 5f72dd0aa06 c5949b9ec1e 52c0eee3329
I'd recommend that you just upgrade the kernel.
Best Regards,
Zhiming