i.MX8M nano: Low latency audio vs. eMMC

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i.MX8M nano: Low latency audio vs. eMMC

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swendt38
Contributor II

Hi,

we have a system based on iMX8M Nano which first used QSPI NOR flash as NV memory but due to higher required capacity we had to change to eMMC (conncted to uSDHC3).

On having activity on eMMC we can hear short audio interruptions (gaps).

We have to use 256 period size for alsa IO in order to fulfill low latency requirements.

Is there any way we can change interrupt priority or DMA priority so SAI gains higher priority than eMMC ?

We use Kernel 5.4.

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Rita_Wang
NXP TechSupport
NXP TechSupport

How about work with QSPI NOR flash before?

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swendt38
Contributor II

With QSPI Flash it worked much better.

It seems eMMC driver locks interrupts for too long.

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