Re: [PATCH] opp: Provide a function for just setting bandwidth

[Viresh Kumar]

On 26-05-23, 12:59, Konrad Dybcio wrote:
> There are some users which have tight power sequencing requirements,
> like the Qualcomm Adreno GPU.
> 
> Dropping the entire OPP kills clocks, bw and required-opps at once,
> but on certain Adrenos we need something like:
> 
> 
> disable memory clock (clk)
> disable all other clocks, including the opp-managed core clock (clk_bulk)
> kill one, fully manually controlled genpd (manual runtime pm)
> remove bus vote (func proposed in this patch)
> kill another genpd (manual runtime pm)
> kill the opp-managed genpd (automatic pm calls)
> 
> Changing the order kills the chip until you reboot the whole board and
> setting freq=0 using dev_pm_opp_set_rate doesn't drop the bw vote.

I am a bit confused now.

What's the exact problem with dev_pm_opp_set_rate(dev, 0) ? It does set the
bandwidth too, from what I can see.

-- 
viresh