SAI1 MCLK Active State Query in i.MX8MM

[sreedhar_appala]

Hi,

I am working with i.MX8MM EVK and 4.14 imx-sumo yocto distribution.

SAI1 is designed as Master, Audio System Clock (MCLK) is generated by SAI1 and send to codec we interfaced.

what we observe is during aplay or arecord functionality MCLK is active and alive.

Is it possible to keep SAI1 MCLK alive(running) always once enabled?

Please let me know your suggestions.

Thank you, Sreedhar

[igorpadykov]

Hi Sreedhar

one can try to comment "clk_disable_unprepare(sai->mclk_clk...)" in fsl_sai.c

https://source.codeaurora.org/external/imx/linux-imx/tree/sound/soc/fsl/fsl_sai.c?h=imx_4.14.98_2.3....

Best regards
igor

[sreedhar_appala]

Hi Igor,

Thank you, I have tested this weekend.

Just by commenting out clk_disable_unprepare(sai->mclk_clk....) is not solving my problem.

The MCLK is seen on CRO only during aplay is executing and dies down when it stops.

Could you please let me know any other code changes are needed.

Thank you, Sreedhar

[sreedhar_appala]

Hi Igor,

Thank you very much for sending the reply separately with required technical support details.

Our system design is mostly similar to the one which is described in the document specified.

Thank you once again,

Sreedhar

@Igor