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

Krishna Chaitanya Chundru
2024-02-19T07:03:44Z

On 2/10/2024 2:44 AM, Konrad Dybcio wrote:
> 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
Viresh & konrad can you both come to conclusion on this.

- Krishna Chaitanya.