From 017b87565b4154201ed0e36c614c8b75c309e0f9 Mon Sep 17 00:00:00 2001
From: Robin Gong <yibin.gong@nxp.com>
Date: Tue, 5 Jul 2022 17:51:03 +0800
Subject: [PATCH] mailbox: imx: fix wakeup failure from freeze mode

stable inclusion
from stable-v5.10.110
commit a16f5ae8ade1644250a934198431f3018663e57b
bugzilla: https://gitee.com/openeuler/kernel/issues/I574AL

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a16f5ae8ade1644250a934198431f3018663e57b

--------------------------------

commit 892cb524ae8a27bf5e42f711318371acd9a9f74a upstream.

Since IRQF_NO_SUSPEND used for imx mailbox driver, that means this irq
can't be used for wakeup source so that can't wakeup from freeze mode.
Add pm_system_wakeup() to wakeup from freeze mode.

Fixes: b7b2796b9b31e("mailbox: imx: ONLY IPC MU needs IRQF_NO_SUSPEND flag")
Reviewed-by: Jacky Bai <ping.bai@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Robin Gong <yibin.gong@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Yu Liao <liaoyu15@huawei.com>
Reviewed-by: Wei Li <liwei391@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>
---
 drivers/mailbox/imx-mailbox.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
index 2543c7b6948b..c5663398c6b7 100644
--- a/drivers/mailbox/imx-mailbox.c
+++ b/drivers/mailbox/imx-mailbox.c
@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/suspend.h>
 #include <linux/slab.h>
 
 #define IMX_MU_xSR_GIPn(x)	BIT(28 + (3 - (x)))
@@ -66,6 +67,7 @@ struct imx_mu_priv {
 	const struct imx_mu_dcfg	*dcfg;
 	struct clk		*clk;
 	int			irq;
+	bool			suspend;
 
 	u32 xcr;
 
@@ -277,6 +279,9 @@ static irqreturn_t imx_mu_isr(int irq, void *p)
 		return IRQ_NONE;
 	}
 
+	if (priv->suspend)
+		pm_system_wakeup();
+
 	return IRQ_HANDLED;
 }
 
@@ -326,6 +331,8 @@ static int imx_mu_startup(struct mbox_chan *chan)
 		break;
 	}
 
+	priv->suspend = true;
+
 	return 0;
 }
 
@@ -543,6 +550,8 @@ static int imx_mu_probe(struct platform_device *pdev)
 
 	clk_disable_unprepare(priv->clk);
 
+	priv->suspend = false;
+
 	return 0;
 
 disable_runtime_pm:
-- 
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