From: Claudiu Beznea Date: Tue, 30 Apr 2024 09:59:30 +0000 (+0300) Subject: serial: core: Call device_set_awake_path() for console port X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a47cf07f60dcb02d01daa19ecf2d5775d6cd12db;p=linux.git serial: core: Call device_set_awake_path() for console port In case the UART port is used as a console, no_console_suspend is available in bootargs and UART port is part of a software-controlled power domain we need to call device_set_awake_path(). This lets the power domain core code know that this domain should not be powered off during system suspend. Otherwise, the UART port power domain is turned off, nothing is printed while suspending and the suspend/resume process is blocked. This was detected on the Renesas RZ/G3S SoC while adding support for power domains. Based on code investigation (on v6.9-rc5), this issue is present on other SoCs (e.g., Renesas R-Mobile A1 [1], IMX8QXP [2]) and different SoCs have particular implementation to handle it. Due to this the patch added the call of device_set_awake_path() in uart_suspend_port() instead of having it in the platform specific UART driver. [1] drivers/pmdomain/renesas/rmobile-sysc.c:116 [2] drivers/pmdomain/imx/scu-pd.c:357 Suggested-by: Ulf Hansson Suggested-by: Geert Uytterhoeven Reviewed-by: Ulf Hansson Reviewed-by: Andy Shevchenko Reviewed-by: Tony Lindgren Reviewed-by: Geert Uytterhoeven Tested-by: Geert Uytterhoeven Signed-off-by: Claudiu Beznea Link: https://lore.kernel.org/r/20240430095930.2806067-1-claudiu.beznea.uj@bp.renesas.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 8a76f378c4457..84ae70d52b056 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -2408,6 +2408,7 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) uport->ops->stop_rx(uport); uart_port_unlock_irq(uport); } + device_set_awake_path(uport->dev); goto unlock; }