On 2021-01-08 19:09, Konrad Dybcio wrote:
Konrad, can you please test this below change without your change?
This brings no difference, a BUG still happens. We're still calling to_a6xx_gpu on ANY device that's probed! Too bad it won't turn my A330 into an A640..
Also, relying on disabling LLCC in the config is out of question as it makes the arm32 kernel not compile with DRM/MSM and it just removes the functionality on devices with a6xx.. (unless somebody removes the dependency on it, which in my opinion is even worse and will cause more problems for developers!).
Disabling LLCC is not the suggestion, I was under the impression that was the cause here for the smmu bug. Anyways, the check for llc slice in case llcc is disabled is not correct as well. I will send a patch for that as well.
The bigger question is how and why did that piece of code ever make it to adreno_gpu.c and not a6xx_gpu.c?
My mistake, I will move it.
To solve it in a cleaner way I propose to move it to an a6xx-specific file, or if it's going to be used with next-gen GPUs, perhaps manage calling of this code via an adreno quirk/feature in adreno_device.c. Now that I think about it, A5xx GPMU en/disable could probably managed like that, instead of using tons of if-statements for each GPU model that has it..
While we're at it, do ALL (and I truly do mean ALL, including the low-end ones, this will be important later on) A6xx GPUs make use of that feature?
I do not have a list of all A6XX GPUs with me currently, but from what I know, A618, A630, A640, A650 has the support.
Thanks, Sai