Sourav Poddar <sourav.poddar@xxxxxx> writes:
> The driver manages "no_console_suspend" by preventing runtime PM
> during the suspend path, which forces the console UART to stay awake.
>
> Signed-off-by: Sourav Poddar <sourav.poddar@xxxxxx>
> ---
> drivers/tty/serial/omap-serial.c | 29 ++++++++++++++++++++++++++++-
> 1 files changed, 28 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
> index 08332f3..468e7ad 100644
> --- a/drivers/tty/serial/omap-serial.c
> +++ b/drivers/tty/serial/omap-serial.c
> @@ -161,6 +161,7 @@ struct uart_omap_port {
> u32 calc_latency;
> struct work_struct qos_work;
> struct pinctrl *pins;
> + bool is_suspending;
> };
>
> #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port)))
> @@ -1278,6 +1279,24 @@ static struct uart_driver serial_omap_reg = {
> };
>
> #ifdef CONFIG_PM_SLEEP
> +static int serial_omap_prepare(struct device *dev)
> +{
> + struct uart_omap_port *up = dev_get_drvdata(dev);
> +
> + if (!console_suspend_enabled && uart_console(&up->port))
> + up->is_suspending = true;
This flag should be set unconditionally. IOW, the system is suspending
independently of the values of those flags. And then...
> + return 0;
> +}
> +
> +static void serial_omap_complete(struct device *dev)
> +{
> + struct uart_omap_port *up = dev_get_drvdata(dev);
> +
> + if (!console_suspend_enabled && uart_console(&up->port))
> + up->is_suspending = false;
> +}
> +
> static int serial_omap_suspend(struct device *dev)
> {
> struct uart_omap_port *up = dev_get_drvdata(dev);
> @@ -1296,7 +1315,10 @@ static int serial_omap_resume(struct device *dev)
>
> return 0;
> }
> -#endif
> +#else
> +#define serial_omap_prepare NULL
> +#define serial_omap_prepare NULL
> +#endif /* CONFIG_PM_SLEEP */
>
> static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
> {
> @@ -1582,6 +1604,9 @@ static int serial_omap_runtime_suspend(struct device *dev)
> struct uart_omap_port *up = dev_get_drvdata(dev);
> struct omap_uart_port_info *pdata = dev->platform_data;
>
> + if (up->is_suspending)
> + return -EBUSY;
... the console checks should be here.
> if (!up)
> return -EINVAL;
>
> @@ -1632,6 +1657,8 @@ static const struct dev_pm_ops serial_omap_dev_pm_ops = {
> SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume)
> SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend,
> serial_omap_runtime_resume, NULL)
> + .prepare = serial_omap_prepare,
> + .complete = serial_omap_complete,
> };
>
> #if defined(CONFIG_OF)
Kevin
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