On 26 November 2015 at 03:24, Ulf Hansson <[email protected]> wrote: > On 26 November 2015 at 09:39, Marek Szyprowski <[email protected]> > wrote: >> Hello, >> >> On 2015-11-25 19:09, Russell King - ARM Linux wrote: >>> >>> On Wed, Nov 25, 2015 at 02:56:10PM +0100, Ulf Hansson wrote: >>>> >>>> On 25 November 2015 at 14:34, Marek Szyprowski <[email protected]> >>>> wrote: >>>>> >>>>> Is ignoring dev_pm_domain_attach() return value a solution for you? >>>> >>>> That's probably better than nothing, but I wonder if it in practice >>>> will have any effect? >>> >>> If the PM domain is down, then trying to tread the ID is likely to oops >>> the kernel. >> >> >> In my case kernel simply hangs (no single message, even when earlyprintk is >> enabled) >> instead of oopsing, that's why I've submitted this patch. >> > > Okay. > > I suggest we go ahead and try that approach (ignoring the return > value). It's "quick fix", but the easiest way forward to solve the > problem. > > My only concern is if such change impacts the boot time. We should do > some tests to see if the change is negligible, if not we should > probably think of something else (like keeping the PM domain powered > until late_init). > > Russell, what do you think?
That's the approach I took for coresight on Juno - simply initialise the power domain very early on and keep it on for things like amba probing to be successful. When the boot process is done unused genPDs are switched off automatically. That way we don't need to add extra code to amba. > > Kind regards > Uffe > > _______________________________________________ > linux-arm-kernel mailing list > [email protected] > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
