* Tero Kristo <t-kristo@xxxxxx> [200514 08:05]:
> On 12/05/2020 23:38, Tony Lindgren wrote:
> > +struct omap_prm_domain {
> > + struct device *dev;
> > + struct omap_prm *prm;
> > + struct generic_pm_domain pd;
> > + void __iomem *pwrstctrl;
> > + void __iomem *pwrstst;
>
> I think the pwrstst is not really used as of now, it is just part of couple
> of dev_dbg prints.
Yes to me it seems the pwrstst only changes later on.
> > +static int omap_prm_domain_power_on(struct generic_pm_domain *domain)
> > +{
> > + struct omap_prm_domain *prmd;
> > + u32 v;
> > +
> > + prmd = genpd_to_prm_domain(domain);
> > + if (!prmd->cap)
> > + return 0;
> > +
> > + dev_dbg(prmd->dev, "%s: %s: old state: pwrstctrl: %08x pwrstst: %08x\n",
> > + __func__, prmd->pd.name, readl_relaxed(prmd->pwrstctrl),
> > + readl_relaxed(prmd->pwrstst));
> > +
> > + if (prmd->pwrstctrl_saved)
> > + v = prmd->pwrstctrl_saved;
> > + else
> > + v = readl_relaxed(prmd->pwrstctrl);
> > +
> > + writel_relaxed(v | OMAP_PRMD_ON_ACTIVE, prmd->pwrstctrl);
> > + dev_dbg(prmd->dev, "%s: %s: new state pwrstctrl: %08x\n",
> > + __func__, prmd->pd.name, readl_relaxed(prmd->pwrstctrl));
>
> Should we wait for the transition to complete here?
Good idea :)
> > + v &= ~PRM_POWERSTATE_MASK;
> > + v |= omap_prm_domain_find_lowest(prmd);
> > +
> > + if (prmd->cap->statechange)
> > + v |= PRM_LOWPOWERSTATECHANGE;
> > + if (prmd->cap->logicretstate)
> > + v &= ~PRM_LOGICRETSTATE;
> > + else
> > + v |= PRM_LOGICRETSTATE;
> > +
> > + writel_relaxed(v, prmd->pwrstctrl);
>
> Should we wait for the transition to complete here?
Would be nice yeah.
> Is any of the following clock handling needed, and if yes, whats its
> purpose?
>
> It looks like this is only used for ABE clkctrl handling on omap4/omap5 (at
> least for now), but afaik, ABE clkctrl is read only so this code would
> effectively do nothing (and potentially just even fail.)
Yeah this seems unnecessary, let's plan on leaving it out. I think the
clocks in the l4_abe dst changes are actually handled by simple-pm-bus,
not this driver, I was just confused :)
Regards,
Tony
