linux-kernel - RE: [PATCH] mailbox: imx: keep MU irq working during suspend/resume

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Date:   Mon, 11 Mar 2019 07:42:50 +0000
From:   Anson Huang <anson.huang@....com>
To:     Anson Huang <anson.huang@....com>,
        "jassisinghbrar@...il.com" <jassisinghbrar@...il.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>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
CC:     dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH] mailbox: imx: keep MU irq working during suspend/resume

Ping...

Best Regards!
Anson Huang

> -----Original Message-----
> From: Anson Huang [mailto:Anson.Huang@....com]
> Sent: 2019年2月12日 20:40
> To: jassisinghbrar@...il.com; shawnguo@...nel.org;
> s.hauer@...gutronix.de; kernel@...gutronix.de; festevam@...il.com;
> linux-kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
> Cc: dl-linux-imx <linux-imx@....com>
> Subject: [PATCH] mailbox: imx: keep MU irq working during suspend/resume
> 
> During noirq suspend phase, mailbox MU irq will be masked but many
> drivers still need to communicate with system controller firmware via
> mailbox, if MU irq is masked, it will cause RPC timeout as below:
> 
> [   23.372103] imx-scu scu: RPC send msg timeout
> 
> Setting MU irq to be wakeup source is NOT working as GIC driver does NOT
> have .irq_set_wake implemented, so to support suspend/resume, just make
> imx mailbox driver NOT suspend, since MU is always a wakeup source on
> i.MX platforms with system controller inside, and its power/clock is
> maintained by system controller, mailbox driver no need to manage them.
> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
>  drivers/mailbox/imx-mailbox.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
> index 774362a..85fc5b5 100644
> --- a/drivers/mailbox/imx-mailbox.c
> +++ b/drivers/mailbox/imx-mailbox.c
> @@ -187,8 +187,8 @@ static int imx_mu_startup(struct mbox_chan *chan)
>  		return 0;
>  	}
> 
> -	ret = request_irq(priv->irq, imx_mu_isr, IRQF_SHARED, cp->irq_desc,
> -			  chan);
> +	ret = request_irq(priv->irq, imx_mu_isr, IRQF_SHARED |
> +			  IRQF_NO_SUSPEND, cp->irq_desc, chan);
>  	if (ret) {
>  		dev_err(priv->dev,
>  			"Unable to acquire IRQ %d\n", priv->irq);
> --
> 2.7.4