[PATCH] mailbox: imx: Skip the suspend flag for i.MX7ULP

[Peng Fan]

> 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 at nxp.com>

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