linux-kernel - Re: iMX8M Mini suspend/resume hanging on imx8m_blk_ctrl_power

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Date: Fri, 05 Apr 2024 16:06:25 +0100
From: vitor <ivitro@...il.com>
To: linux-pm@...r.kernel.org, imx@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: vitor.soares@...adex.com, ulf.hansson@...aro.org, shawnguo@...nel.org, 
	s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com, 
	rafael@...nel.org, geert+renesas@...der.be, peng.fan@....com, 
	linus.walleij@...aro.org, u.kleine-koenig@...gutronix.de, marex@...x.de
Subject: Re: iMX8M Mini suspend/resume hanging on imx8m_blk_ctrl_power_on()

Hi,

On Thu, 2024-04-04 at 16:53 +0100, vitor wrote:
> Greetings,
> 
> I'm trying to suspend/resume our Verdin iMX8M Mini with VPU IP using
> the latest 6.9.0-rc2 Kernel. While the system can suspend without
> issues, it hangs on the resume routine. After some investigation, I
> can
> see the Kernel hanging on imx8m_blk_ctrl_power_on()[1] while resuming
> the hantro-vpu power domain.
> 
> Any hint about that?
> 
> [1]
> https://elixir.bootlin.com/linux/v6.9-rc2/source/drivers/pmdomain/imx
> /imx8m-blk-ctrl.c#L101
> 

Looking at other child nodes of the pgc node, pgc_vpu_[g1|g2|h1] seems
to be nested into pgc_vpumix.

After applying the following changes to imx8mm.dtsi, the suspend/resume
is working.


@@ -739,16 +739,19 @@ pgc_vpumix: power-domain@6 {
	pgc_vpu_g1: power-domain@7 {
		#power-domain-cells = <0>;
		reg = <IMX8MM_POWER_DOMAIN_VPUG1>;
+		power-domains = <&pgc_vpumix>;
	};

	pgc_vpu_g2: power-domain@8 {
		#power-domain-cells = <0>;
		reg = <IMX8MM_POWER_DOMAIN_VPUG2>;
+		power-domains = <&pgc_vpumix>;
	};

	pgc_vpu_h1: power-domain@9 {
		#power-domain-cells = <0>;
		reg = <IMX8MM_POWER_DOMAIN_VPUH1>;
+		power-domains = <&pgc_vpumix>;
	};


I will prepare the patch to send in the next couple of days.

Regards,
Vitor Soares