On Fri, Sep 16, 2022 at 04:01:24PM +0530, Rajendra Nayak wrote: > USB has a requirement to put a performance state vote on 'cx' > while active. Use 'required-opps' to pass this information from > device tree, and since all the GDSCs in GCC (including USB) are > sub-domains of cx, we also add cx as a power-domain for GCC. > Now when any of the consumers of the GDSCs (in this case USB) > votes on a perforamance state, genpd framework can identify that > the GDSC itself does not support a performance state and it > then propogates the vote to the parent, which in this case is cx. > > This change would also mean that any GDSC in GCC thats left enabled > during low power state (perhaps because its marked with a > ALWAYS_ON flag) can prevent the system from entering low power > since that would prevent cx from transitioning to low power. > Ideally any consumers that would need to have their devices > (partially) powered to support wakeups should look at making the > resp. GDSCs transtion to a Retention (PWRSTS_RET) state instead > of leaving them ALWAYS_ON. > > Signed-off-by: Rajendra Nayak <quic_rjendra@xxxxxxxxxxx> I suppose a similar patch is needed for sc7180?
