linux-kernel - RE: [PATCH] mailbox: imx: Skip the suspend flag for i.MX7ULP

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Message-ID:
 <PAXPR04MB8459A075646D9C6956035DC988AAA@PAXPR04MB8459.eurprd04.prod.outlook.com>
Date: Tue, 16 Dec 2025 08:34:46 +0000
From: Peng Fan <peng.fan@....com>
To: Jacky Bai <ping.bai@....com>, Jassi Brar <jassisinghbrar@...il.com>, Shawn
 Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix
 Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH] mailbox: imx: Skip the suspend flag for i.MX7ULP

> Subject: [PATCH] mailbox: imx: Skip the suspend flag for i.MX7ULP
> 
> In current imx-mailbox driver, the MU IRQ is configured with
> 'IRQF_NO_SUSPEND' flag set. So during linux suspend/resume flow, the
> MU IRQ is always enabled. With commit 892cb524ae8a ("mailbox: imx:
> fix wakeup failure from freeze mode"), if the MU IRQ is triggered after
> the priv->suspended flag has been set, the system suspend will be
> aborted.
> 
> On i.MX7ULP platform, certain drivers that depend on rpmsg may need
> to send rpmsg request and receive an acknowledgment from the
> remote core during the late_suspend stage. Early suspend abort is not
> expected, and the i.MX7ULP already has additional hardware and
> software to make sure the system can be wakeup from freeze mode
> correctly when MU IRQ is trigger.
> 
> Skip the 'suspend' flag handling logic on i.MX7ULP to avoid the early
> abort when doing suspend.
> 
> Signed-off-by: Jacky Bai <ping.bai@....com>

Reviewed-by: Peng Fan <peng.fan@....com>