From: Erwan Le Ray <erwan.leray@st.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@st.com>,
Sumit Semwal <sumit.semwal@linaro.org>
Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
linaro-mm-sig@lists.linaro.org, Erwan Le Ray <erwan.leray@st.com>,
linux-serial@vger.kernel.org,
Fabrice Gasnier <fabrice.gasnier@st.com>,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org,
linux-media@vger.kernel.org
Subject: [PATCH 1/1] serial: stm32: add no_console_suspend support
Date: Tue, 19 May 2020 11:41:04 +0200 [thread overview]
Message-ID: <20200519094104.27082-1-erwan.leray@st.com> (raw)
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>
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 9cfcf355567a..5afd29162f6c 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -1425,7 +1425,18 @@ 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;
}
--
2.17.1
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reply other threads:[~2020-05-19 9:41 UTC|newest]
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