Re: ABE/AESS on modern kernel: clocks, hwmods etc.

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On Sat, 2 Sep 2023 09:27:41 +0200
"H. Nikolaus Schaller" <hns@xxxxxxxxxxxxx> wrote:

> 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.
for omap4 I guess the 
                        clocks = <&abe_clkctrl OMAP4_AESS_CLKCTRL 0>;

in omap4-l4-abe.dtsi should be enough and correcly referencing fclk?


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