Re: [PATCH] Revert "bus: ti-sysc: Probe for l4_wkup and l4_cfg interconnect devices first"

Sverdlin, Alexander
2025-03-13T20:42:26Z

Hi Andreas!

On Thu, 2025-03-13 at 20:21 +0100, Andreas Kemnade wrote:
> > This reverts commit 4700a00755fb5a4bb5109128297d6fd2d1272ee6.
> >
> > It brakes target-module@2b300050 ("ti,sysc-omap2") probe on AM62x in a case
> > when minimally-configured system tries to network-boot:
> >
> brakes or breaks? To unterstand the severity of the issue...

Thanks for the correction, it should have been "breaks"...

> > [    6.888776] probe of 2b300050.target-module returned 517 after 258 usecs
> > [   17.129637] probe of 2b300050.target-module returned 517 after 708 usecs
> > [   17.137397] platform 2b300050.target-module: deferred probe pending: (reason unknown)
> > [   26.878471] Waiting up to 100 more seconds for network.
> >
> > Arbitrary 10 deferrals is really not a solution to any problem.
>
> So there is a point where no more probe of anything pending are
> triggered and therefore things are not probed?

Because there is a point indeed (if we configure quite minimal set of drivers just
enough to mount NFS) when deferred probes are not triggered any longer.

> > Stable mmc enumeration can be achiever by filling /aliases node properly
> > (4700a00755fb commit's rationale).
> >
> yes, it does not look like a clean solution. And we have the
> proper aliases node in many places. What I am a bit wondering about is
> what kind of sleeping dogs we are going to wake up by this revert. So I
> think this should be tested a lot esp. about possible pm issues.
>
> Not every dependency in the sysc probe area is properly defined.

But the patch I propose to revert is really not a solution for missing
dependencies on syscons. I'm fine with not propagating this to stable,
but reverting in master should give enough time for older SoCs to test,
WDYT?

--
Alexander Sverdlin
Siemens AG