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

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Message-ID: <Z6YviAFD4Az3EIBa@hovoldconsulting.com>
Date: Fri, 7 Feb 2025 17:06:32 +0100
From: Johan Hovold <johan@...nel.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: 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 Fri, Feb 07, 2025 at 04:41:18PM +0100, Rafael J. Wysocki wrote:
> On Fri, Feb 7, 2025 at 3:45 PM Johan Hovold <johan@...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.
> 
> This is kind of confusing.  Why use pm_runtime_force_suspend() if
> runtime PM is never enabled and cannot really work?

It's only done for some buses that this driver handles. The driver is
buggy; I'm preparing a fix for it regardless of the correctness of the
commit that now triggered this.

Johan