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

Daisuke Mizobuchi
2024-04-12T05:56:50Z

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>
---
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;
}

--
2.30.2