Hi Tony, we are still struggling with ABE/AESS on the OMAP4/5 (PandaES, Pyra, OMAP5UEVM, BT-200). Symptoms are that * pmem access will be broken after initializing the ABE-DSP * it seems the AES DSP is not running (and leads to timeouts when sending audio data to the buffers) * boot issues on BT-200 What we have found is that a TI kernel v3.8 works on the OMAP5EVM but newer kernels start to fail. A major observation ist that hwmods have been removed in smaller pieces and the last removal was in v5.6: c33ff4c864d2b ARM: OMAP2+: Drop unused PRM defines for omap4 There are also some other unknown factors in our code where we do not know how to port to modern kernels: * there is a context lost code but how to make use of it? * pmem fails unless we disable omap_aess_write_event_generator(aess, EVENT_TIMER); It seems as if clocks and code like omap_hwmod_aess_preprogram() is missing. Especially for the omap4 we have found no equivalent to aess_fclk which exists for omap5 and dra7. Nowhere is a reference using the abe_iclk node. This would mean that power/clock management for ABE/AESS is incomplete/missing. So maybe can you review our device tree definitions? Our patched DTS is included here: https://github.com/goldelico/letux-kernel/tree/letux/aess-v12 https://github.com/goldelico/letux-kernel/tree/letux/aess-v12/arch/arm/boot/dts/ti/omap and compare e.g. with the old hwmods code which is doing quite special AESS setup like https://elixir.bootlin.com/linux/v4.18.20/source/arch/arm/mach-omap2/omap_hwmod_reset.c#L43 https://elixir.bootlin.com/linux/v4.18.20/source/include/sound/aess.h#L37 I hope that I properly summarized the discussions with Patrik and Andreas who please add if I forgot something important. BR and thanks, Nikolaus
