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

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Date: Wed, 8 May 2024 19:40:48 +0200
From: Francesco Dolcini <francesco@...cini.it>
To: Vitor Soares <ivitro@...il.com>, Adam Ford <aford173@...il.com>
Cc: 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 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

Francesco