Re: [PATCH v2 5.10.y 1/1] mailbox: imx: fix suspend failure

[Dominique MARTINET <dominique.martinet@atmark-techno.com>]

(Added Ccs again - Robin Gong and Jassi Brar both bounced last time so
didn't add them back)

Daisuke Mizobuchi wrote on Fri, Apr 12, 2024 at 02:56:48PM +0900:
> imx_mu_isr() always calls pm_system_wakeup() even when it should not,
> making the system unable to enter sleep.
> 
> Suspend fails as follows:
>  armadillo:~# echo mem > /sys/power/state
>  [ 2614.602432] PM: suspend entry (deep)
>  [ 2614.610640] Filesystems sync: 0.004 seconds
>  [ 2614.618016] Freezing user space processes ... (elapsed 0.001 seconds) done.
>  [ 2614.626555] OOM killer disabled.
>  [ 2614.629792] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
>  [ 2614.638456] printk: Suspending console(s) (use no_console_suspend to debug)
>  [ 2614.649504] PM: Some devices failed to suspend, or early wake event detected
>  [ 2614.730103] PM: resume devices took 0.080 seconds
>  [ 2614.741924] OOM killer enabled.
>  [ 2614.745073] Restarting tasks ... done.
>  [ 2614.754532] PM: suspend exit
>  ash: write error: Resource busy
>  armadillo:~#
> 
> Upstream commit 892cb524ae8a is correct, so this seems to be a
> mistake during cherry-pick.
> 
> Cc: <stable@vger.kernel.org>
> Fixes: a16f5ae8ade1 ("mailbox: imx: fix wakeup failure from freeze mode")
> Signed-off-by: Daisuke Mizobuchi <mizo@atmark-techno.com>
> Reviewed-by: Dominique Martinet <dominique.martinet@atmark-techno.com>

Ok.

Thanks,
Dominique

> ---
>  drivers/mailbox/imx-mailbox.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
> index c5663398c6b7..28f5450e4130 100644
> --- a/drivers/mailbox/imx-mailbox.c
> +++ b/drivers/mailbox/imx-mailbox.c
> @@ -331,8 +331,6 @@ static int imx_mu_startup(struct mbox_chan *chan)
>  		break;
>  	}
>  
> -	priv->suspend = true;
> -
>  	return 0;
>  }
>  
> @@ -550,8 +548,6 @@ static int imx_mu_probe(struct platform_device *pdev)
>  
>  	clk_disable_unprepare(priv->clk);
>  
> -	priv->suspend = false;
> -
>  	return 0;
>  
>  disable_runtime_pm:
> @@ -614,6 +610,8 @@ static int __maybe_unused imx_mu_suspend_noirq(struct device *dev)
>  	if (!priv->clk)
>  		priv->xcr = imx_mu_read(priv, priv->dcfg->xCR);
>  
> +	priv->suspend = true;
> +
>  	return 0;
>  }
>  
> @@ -632,6 +630,8 @@ static int __maybe_unused imx_mu_resume_noirq(struct device *dev)
>  	if (!imx_mu_read(priv, priv->dcfg->xCR) && !priv->clk)
>  		imx_mu_write(priv, priv->xcr, priv->dcfg->xCR);
>  
> +	priv->suspend = false;
> +
>  	return 0;
>  }
>