diff options
| author | Erwan Le Ray | 2020-05-19 11:41:04 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2020-05-19 15:53:36 +0200 |
| commit | 55484fcc5061c3f41b2f8f37b4a5754d3682f1a5 (patch) | |
| tree | 05de2349131b5c0febb868fc38fa1d863683f793 /drivers/tty | |
| parent | b14109f302d01899a8d7aad0d9a2097faa5fb486 (diff) | |
serial: stm32: add no_console_suspend support
In order to display console messages in low power mode, console pins
must be kept active after suspend call.
Initial patch "serial: stm32: add support for no_console_suspend" was part
of "STM32 usart power improvement" series, but as dependancy to
console_suspend pinctl state has been removed to fit with Rob comment [1],
this patch has no more dependancy with any other patch of this series.
[1] https://lkml.org/lkml/2019/7/9/451
Signed-off-by: Erwan Le Ray <erwan.leray@st.com>
Link: https://lore.kernel.org/r/20200519094104.27082-1-erwan.leray@st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/stm32-usart.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index 7d1acb3786b8..8602ff357321 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -1424,7 +1424,18 @@ static int __maybe_unused stm32_serial_suspend(struct device *dev) else stm32_serial_enable_wakeup(port, false); - pinctrl_pm_select_sleep_state(dev); + /* + * When "no_console_suspend" is enabled, keep the pinctrl default state + * and rely on bootloader stage to restore this state upon resume. + * Otherwise, apply the idle or sleep states depending on wakeup + * capabilities. + */ + if (console_suspend_enabled || !uart_console(port)) { + if (device_may_wakeup(dev)) + pinctrl_pm_select_idle_state(dev); + else + pinctrl_pm_select_sleep_state(dev); + } return 0; } |