Re: [PATCH v4 08/13] iommu/rockchip: Control clocks needed to access the IOMMU

[JeffyChen]

Hi guys,

On 01/25/2018 06:24 PM, JeffyChen wrote:
> On 01/25/2018 05:42 PM, Randy Li wrote:
> > > >
> > >
> > > confirmed with Simon, there might be some iommus don't have a pd, and
> > We use the pd to control the NIU node(not on upstream), without a pd or
> > fake pd, none of the platform would work.
> after talked offline, it's possible to have iommu without pd in upstream
> kernel(and chromeos kernel), but on our internal kernel, the drivers
> would require pd(or fake pd) to reset modules when error happens.
>
> anyway, i think that means we do need clock control here.

found another reason to not depend on pd to control clocks.

currently we are using pd's pm_clk to keep clocks enabled during power 
on. but in our pd binding doc, that is not needed:
- clocks (optional): phandles to clocks which need to be enabled while 
power domain
        switches state.

confirmed with Caesar, the pm_clk only required for some old 
chips(rk3288 for example) due to hardware issue.

and i tested my chromebook kevin(rk3399), it works well after remove the 
pm_clk:

+++ b/drivers/soc/rockchip/pm_domains.c
@@ -478,7 +478,6 @@ static int rockchip_pm_add_one_domain(struct 
rockchip_pmu *pmu,
        pd->genpd.power_on = rockchip_pd_power_on;
        pd->genpd.attach_dev = rockchip_pd_attach_dev;
        pd->genpd.detach_dev = rockchip_pd_detach_dev;
-       pd->genpd.flags = GENPD_FLAG_PM_CLK;

will do more tests and send patch tomorrow.

> > > the CONFIG_PM could be disabled.I am hard to believe a modern platform
> > > can work without that.
> > >
> > > so it might be better to control clocks in iommu driver itself.
> > I won't
> > insist how the version of the iommu patch on the upstream, I
> > just post an idea here.
> > The version for kernel 4.4 is under internal review, the implementation
> > has been modified many times.
> >
> > I would suggest the managing clocks in pd is a more easy way and don't
> > need to spare those thing in two places.