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jz47xx: Audio path tweaks:

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* Increase audio buffer size to better handle IRQ latency (256->2048)
 * Ensure DMA engine is idle prior to starting transfers
 * Set AIC to repeat last sample in case of underflows

Change-Id: I9c45c20481ee072e5882b7586fb7d50bd8ef2f35
This commit is contained in:
Solomon Peachy 2020-09-04 15:55:11 -04:00
parent 5f5e44f593
commit 90a4f28c27
5 changed files with 10 additions and 0 deletions
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4
firmware/export/pcm_mixer.h
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@ -30,6 +30,10 @@
#if CONFIG_CPU == PP5002
/* There's far less time to do mixing because HW FIFOs are short */
#define MIX_FRAME_SAMPLES 64
#elif (CONFIG_CPU == JZ4760B) || (CONFIG_CPU == JZ4732)
/* These MIPS32r1 targets have a very high interrupt latency, which
unfortunately causes a lot of audio underruns under even moderate load */
#define MIX_FRAME_SAMPLES 2048
#elif (CONFIG_PLATFORM & PLATFORM_MAEMO5) || defined(DX50) || defined(DX90)
/* Maemo 5 needs 2048 samples for decent performance.
Otherwise the locking overhead inside gstreamer costs too much */