On 17.12.2024 3:51 PM, Neil Armstrong wrote: > The Adreno GPU Management Unit (GMU) can also scale DDR Bandwidth along > the Frequency and Power Domain level, but by default we leave the > OPP core scale the interconnect ddr path. > > While scaling via the interconnect path was sufficient, newer GPUs > like the A750 requires specific vote paremeters and bandwidth to > achieve full functionality. > > In order to calculate vote values used by the GPU Management > Unit (GMU), we need to parse all the possible OPP Bandwidths and > create a vote value to be sent to the appropriate Bus Control > Modules (BCMs) declared in the GPU info struct. > > This vote value is called IB, while on the other side the GMU also > takes another vote called AB which is a 16bit quantized value > of the floor bandwidth against the maximum supported bandwidth. > The AB vote will be calculated later when setting the frequency. > > The vote array will then be used to dynamically generate the GMU > bw_table sent during the GMU power-up. > > Reviewed-by: Akhil P Oommen <quic_akhilpo@xxxxxxxxxxx> > Signed-off-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx> > --- Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx> Konrad
