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

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Date:   Fri, 24 Apr 2020 02:38:04 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Anson Huang <anson.huang@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "ben.dooks@...ethink.co.uk" <ben.dooks@...ethink.co.uk>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH 1/2] firmware: imx: make sure MU irq can wake up system
 from suspend mode

> From: Anson Huang <Anson.Huang@....com>
> Sent: Friday, April 24, 2020 7:07 AM
> 
> 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>

Reviewed-by: Dong Aisheng <aisheng.dong@....com>

Regards
Aisheng

> ---
>  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