This is a note to let you know that I've just added the patch titled
serial: 8250_omap: Fix errors with no_console_suspend
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
serial-8250_omap-fix-errors-with-no_console_suspend.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 560706eff7c8e5621b0d63afe0866e0e1906e87e Mon Sep 17 00:00:00 2001
From: Tony Lindgren <tony@xxxxxxxxxxx>
Date: Tue, 26 Sep 2023 09:13:17 +0300
Subject: serial: 8250_omap: Fix errors with no_console_suspend
From: Tony Lindgren <tony@xxxxxxxxxxx>
commit 560706eff7c8e5621b0d63afe0866e0e1906e87e upstream.
We now get errors on system suspend if no_console_suspend is set as
reported by Thomas. The errors started with commit 20a41a62618d ("serial:
8250_omap: Use force_suspend and resume for system suspend").
Let's fix the issue by checking for console_suspend_enabled in the system
suspend and resume path.
Note that with this fix the checks for console_suspend_enabled in
omap8250_runtime_suspend() become useless. We now keep runtime PM usage
count for an attached kernel console starting with commit bedb404e91bb
("serial: 8250_port: Don't use power management for kernel console").
Fixes: 20a41a62618d ("serial: 8250_omap: Use force_suspend and resume for system suspend")
Cc: stable <stable@xxxxxxxxxx>
Cc: Udit Kumar <u-kumar1@xxxxxx>
Reported-by: Thomas Richard <thomas.richard@xxxxxxxxxxx>
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
Tested-by: Thomas Richard <thomas.richard@xxxxxxxxxxx>
Reviewed-by: Dhruva Gole <d-gole@xxxxxx>
Link: https://lore.kernel.org/r/20230926061319.15140-1-tony@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/8250/8250_omap.c | 25 ++++++++++---------------
1 file changed, 10 insertions(+), 15 deletions(-)
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -1618,7 +1618,7 @@ static int omap8250_suspend(struct devic
{
struct omap8250_priv *priv = dev_get_drvdata(dev);
struct uart_8250_port *up = serial8250_get_port(priv->line);
- int err;
+ int err = 0;
serial8250_suspend_port(priv->line);
@@ -1628,7 +1628,8 @@ static int omap8250_suspend(struct devic
if (!device_may_wakeup(dev))
priv->wer = 0;
serial_out(up, UART_OMAP_WER, priv->wer);
- err = pm_runtime_force_suspend(dev);
+ if (uart_console(&up->port) && console_suspend_enabled)
+ err = pm_runtime_force_suspend(dev);
flush_work(&priv->qos_work);
return err;
@@ -1637,11 +1638,15 @@ static int omap8250_suspend(struct devic
static int omap8250_resume(struct device *dev)
{
struct omap8250_priv *priv = dev_get_drvdata(dev);
+ struct uart_8250_port *up = serial8250_get_port(priv->line);
int err;
- err = pm_runtime_force_resume(dev);
- if (err)
- return err;
+ if (uart_console(&up->port) && console_suspend_enabled) {
+ err = pm_runtime_force_resume(dev);
+ if (err)
+ return err;
+ }
+
serial8250_resume_port(priv->line);
/* Paired with pm_runtime_resume_and_get() in omap8250_suspend() */
pm_runtime_mark_last_busy(dev);
@@ -1718,16 +1723,6 @@ static int omap8250_runtime_suspend(stru
if (priv->line >= 0)
up = serial8250_get_port(priv->line);
- /*
- * When using 'no_console_suspend', the console UART must not be
- * suspended. Since driver suspend is managed by runtime suspend,
- * preventing runtime suspend (by returning error) will keep device
- * active during suspend.
- */
- if (priv->is_suspending && !console_suspend_enabled) {
- if (up && uart_console(&up->port))
- return -EBUSY;
- }
if (priv->habit & UART_ERRATA_CLOCK_DISABLE) {
int ret;
Patches currently in stable-queue which might be from tony@xxxxxxxxxxx are
queue-6.5/serial-core-fix-checks-for-tx-runtime-pm-state.patch
queue-6.5/serial-8250_omap-fix-errors-with-no_console_suspend.patch
