Re: [PATCH 0/3] SM8450 IPA support

[Esteban Urrutia]

On 6/23/26 11:56 AM, Alex Elder wrote:
> I assume you have implemented this based on what you found in
> some downstream code.  And if so, could you please indicate
> where to find that (so I can do some cross-referencing myself).
> I no longer have access to any Qualcomm internal documentation.

Hello. Yes, that would be the case. What I used goes as follows.

1. My personal findings regarding IPA:
https://gist.github.com/esteuwu/bd49ed67ed9290f41612bdae1cacb5bc

Note that these may be subject to errors since I mostly cross-checked
values to get here.

2. SM8450 downstream device tree:
https://github.com/LineageOS/android_kernel_qcom_sm8450-devicetrees/blob/lineage-20/qcom/waipio.dtsi#L3304

3. SM8475 downstream device tree:
https://github.com/LineageOS/android_kernel_qcom_sm8450-devicetrees/blob/lineage-20/qcom/cape.dtsi#L2624

It's worth mentioning that between SM8450 and SM8475, IPA SRAM size is
different, so I used the smaller SRAM size to support SM8475 as well. Hence
the reason why I included SM8475's downstream device tree as well.

4. SM8450/SM8475 downstream IPA driver:
https://github.com/LineageOS/android_kernel_qcom_sm8450-modules/tree/lineage-20/qcom/opensource/dataipa

Most of my cross-checking came from the source code in this folder.

Finally, for some values such as qmap, aggregation, tre_count and
event_count, I had to cross-check on the same folder that all
ipa_data-vX.Y.c files reside, since I couldn't find any reference to these
values in downstream code.

Regards,
Esteban