[PATCH 0/4] Retrieve information about DDR from SMEM

[Konrad Dybcio]

On 4/9/25 5:44 PM, Dmitry Baryshkov wrote:
> On 09/04/2025 17:47, Konrad Dybcio wrote:
>> SMEM allows the OS to retrieve information about the DDR memory.
>> Among that information, is a semi-magic value called 'HBB', or Highest
>> Bank address Bit, which multimedia drivers (for hardware like Adreno
>> and MDSS) must retrieve in order to program the IP blocks correctly.
>>
>> This series introduces an API to retrieve that value, uses it in the
>> aforementioned programming sequences and exposes available DDR
>> frequencies in debugfs (to e.g. pass to aoss_qmp debugfs). More
>> information can be exposed in the future, as needed.
> 
> I know that for some platforms HBB differs between GPU and DPU (as it's being programmed currently). Is there a way to check, which values are we going to program:
> 
> - SM6115, SM6350, SM6375 (13 vs 14)
> - SC8180X (15 vs 16)
> - QCM2290 (14 vs 15)

I believe the easiest way is to give them a smoke test.

In any case, unless something is really wrong, any changes made
by this patchset are supposed to be corrections

Konrad