linux-kernel - Re: [PATCH v1] PM: sleep: core: Synchronize runtime PM status of parents and children

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Message-ID: <CAJZ5v0iz7NNhoCTJ4j6GKjqEL5Wip1EJ1kpS71EutSxGVcWuVw@mail.gmail.com>
Date: Sat, 8 Feb 2025 18:43:01 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Johan Hovold <johan@...nel.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Jon Hunter <jonathanh@...dia.com>, 
	"Rafael J. Wysocki" <rjw@...ysocki.net>, Linux PM <linux-pm@...r.kernel.org>, 
	LKML <linux-kernel@...r.kernel.org>, Alan Stern <stern@...land.harvard.edu>, 
	Bjorn Helgaas <helgaas@...nel.org>, Linux PCI <linux-pci@...r.kernel.org>, 
	Ulf Hansson <ulf.hansson@...aro.org>, 
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, Kevin Xie <kevin.xie@...rfivetech.com>, 
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v1] PM: sleep: core: Synchronize runtime PM status of
 parents and children

On Sat, Feb 8, 2025 at 5:42 PM Johan Hovold <johan@...nel.org> wrote:
>
> On Sat, Feb 08, 2025 at 01:10:19PM +0100, Rafael J. Wysocki wrote:
> > On Fri, Feb 7, 2025 at 7:14 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
>
> > > > > > > On Fri, Feb 07, 2025 at 02:50:29PM +0100, Johan Hovold wrote:
>
> > > > > > > Ok, so the driver data is never set and runtime PM is never enabled for
> > > > > > > this simple bus device, which uses pm_runtime_force_suspend() for system
> > > > > > > sleep.
>
> > For now, the power.set_active propagation can be restricted to the
> > parent of the device with DPM_FLAG_SMART_SUSPEND set that needs to be
> > resumed and that will just be sufficient ATM, so attached is a patch
> > doing this.
>
> I can confirm that this fixes the simple-pm-bus regression (without
> reintroducing the pci warning) in case you want to get this to Linus
> for rc2:
>
> Tested-by: Johan Hovold <johan+linaro@...nel.org>

-rc2 may be a bit too close, and I think I should add a check for
ignore_children to it, but yeah.

I'll send a full patch shortly, thanks!