linux-kernel - Re: [PATCH v1] pmdomain: imx8m-blk-ctrl: fix suspend/resume order

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Date: Wed, 8 May 2024 12:43:38 -0500
From: Adam Ford <aford173@...il.com>
To: Francesco Dolcini <francesco@...cini.it>
Cc: Vitor Soares <ivitro@...il.com>, Ulf Hansson <ulf.hansson@...aro.org>, 
	Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
	Pengutronix Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>, 
	Vitor Soares <vitor.soares@...adex.com>, linux-pm@...r.kernel.org, imx@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	stable@...r.kernel.org, Lucas Stach <l.stach@...gutronix.de>
Subject: Re: [PATCH v1] pmdomain: imx8m-blk-ctrl: fix suspend/resume order

On Wed, May 8, 2024 at 12:40 PM Francesco Dolcini <francesco@...cini.it> wrote:
>
> On Thu, Apr 18, 2024 at 04:51:51PM +0100, Vitor Soares wrote:
> > From: Vitor Soares <vitor.soares@...adex.com>
> >
> > During the probe, the genpd power_dev is added to the dpm_list after
> > blk_ctrl due to its parent/child relationship. Making the blk_ctrl
> > suspend after and resume before the genpd power_dev.
> >
> > As a consequence, the system hangs when resuming the VPU due to the
> > power domain dependency.
> >
> > To ensure the proper suspend/resume order, add a device link betweem
> > blk_ctrl and genpd power_dev. It guarantees genpd power_dev is suspended
> > after and resumed before blk-ctrl.
> >
>
> Cc: Adam Ford

Thanks!  This is what I was thinking from the other thread.  I just
didn't see this one.


adam
>
> Francesco
>