Re: [PATCH v6 5/6] arm64: dts: qcom: sm8450: Add opp table support to PCIe

Konrad Dybcio
2024-02-09T21:14:30Z

On 2.02.2024 08:33, Viresh Kumar wrote:
> On 01-02-24, 15:45, Konrad Dybcio wrote:
>> I'm lukewarm on this.
>>
>> A *lot* of hardware has more complex requirements than "x MBps at y MHz",
>> especially when performance counters come into the picture for dynamic
>> bw management.
>>
>> OPP tables can't really handle this properly.
>
> There was a similar concern for voltages earlier on and we added the capability
> of adjusting the voltage for OPPs in the OPP core. Maybe something similar can
> be done here ?
>
I really don't think it's fitting.. At any moment the device may require any
bandwidth value between 0 and MAX_BW_PER_LINK_GEN * LINK_WIDTH..

Konrad