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Tue, 19 May 2020 11:41:13 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id D257310002A; Tue, 19 May 2020 11:41:10 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag3node1.st.com [10.75.127.7]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id BD9F12B1881; Tue, 19 May 2020 11:41:10 +0200 (CEST) Received: from localhost (10.75.127.47) by SFHDAG3NODE1.st.com (10.75.127.7) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 19 May 2020 11:41:10 +0200 From: Erwan Le Ray To: Greg Kroah-Hartman , Jiri Slaby , Maxime Coquelin , Alexandre Torgue , Sumit Semwal Subject: [PATCH 1/1] serial: stm32: add no_console_suspend support Date: Tue, 19 May 2020 11:41:04 +0200 Message-ID: <20200519094104.27082-1-erwan.leray@st.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-Originating-IP: [10.75.127.47] X-ClientProxiedBy: SFHDAG5NODE3.st.com (10.75.127.15) To SFHDAG3NODE1.st.com (10.75.127.7) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.676 definitions=2020-05-19_03:2020-05-19, 2020-05-19 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200519_024127_271651_4471F1B5 X-CRM114-Status: GOOD ( 13.18 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, Erwan Le Ray , linux-serial@vger.kernel.org, Fabrice Gasnier , linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel