Re: [PATCH v4 06/12] cpufreq: qcom: Update the bandwidth levels on frequency change

Sibi Sankar
2020-05-26T17:48:25Z

On 2020-05-05 12:49, Sibi Sankar wrote:
> On 2020-05-05 10:20, Viresh Kumar wrote:
>> On 05-05-20, 01:52, Sibi Sankar wrote:
>>> Add support to parse optional OPP table attached to the cpu node when
>>> the OPP bandwidth values are populated. This allows for scaling of
>>> DDR/L3 bandwidth levels with frequency change.
>>>
>>> Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
>>
>> What about using opp_set_rate instead ?
>
> I can't use opp_set_rate since
> the cpu dev does not have a
> clock associated with it and the
> scaling is done through writing
> on perf state register.

Viresh,

https://patchwork.kernel.org/cover/11548479/
GPU driver uses Georgi's series
for scaling and will need a way to
remove the icc votes in the suspend
path, (this looks like a pattern
that might be used by other clients
as well) I could probably update
opp_set_bw to support removing bw
when NULL opp is specified. Similarly
opp_set_rate will need to support
set bw to 0 when set_rate is passed
0 as target freq for the same use case.

--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project.