linux-kernel - [PATCH 1/2] firmware: imx: make sure MU irq can wake up system from suspend mode

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Message-Id: <1587683231-18468-1-git-send-email-Anson.Huang@nxp.com>
Date:   Fri, 24 Apr 2020 07:07:10 +0800
From:   Anson Huang <Anson.Huang@....com>
To:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, ben.dooks@...ethink.co.uk,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Linux-imx@....com
Subject: [PATCH 1/2] firmware: imx: make sure MU irq can wake up system from suspend mode

IRQF_NO_SUSPEND flag is set for MU IRQ of IPC work, but with this
flag set, IRQD_WAKEUP_ARMED flag will NOT be set during
suspend_device_irq() phase, then when MU IRQ arrives, it will NOT
wake up system from suspend.

To fix this issue, pm_system_wakeup() is called in general MU IRQ
handler to make sure system can be waked up when MU IRQ arrives.

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
 drivers/firmware/imx/imx-scu-irq.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/firmware/imx/imx-scu-irq.c b/drivers/firmware/imx/imx-scu-irq.c
index db655e8..d9dcc20 100644
--- a/drivers/firmware/imx/imx-scu-irq.c
+++ b/drivers/firmware/imx/imx-scu-irq.c
@@ -10,6 +10,7 @@
 #include <linux/firmware/imx/ipc.h>
 #include <linux/firmware/imx/sci.h>
 #include <linux/mailbox_client.h>
+#include <linux/suspend.h>
 
 #define IMX_SC_IRQ_FUNC_ENABLE	1
 #define IMX_SC_IRQ_FUNC_STATUS	2
@@ -91,6 +92,7 @@ static void imx_scu_irq_work_handler(struct work_struct *work)
 		if (!irq_status)
 			continue;
 
+		pm_system_wakeup();
 		imx_scu_irq_notifier_call_chain(irq_status, &i);
 	}
 }
-- 
2.7.4