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Thu, 13 Jun 2019 15:50:21 +0200 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 8188441; Thu, 13 Jun 2019 13:50:18 +0000 (GMT) Received: from Webmail-eu.st.com (Safex1hubcas21.st.com [10.75.90.44]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id CD94C2BDD; Thu, 13 Jun 2019 13:50:17 +0000 (GMT) Received: from SAFEX1HUBCAS22.st.com (10.75.90.93) by SAFEX1HUBCAS21.st.com (10.75.90.44) with Microsoft SMTP Server (TLS) id 14.3.439.0; Thu, 13 Jun 2019 15:50:17 +0200 Received: from localhost (10.201.23.31) by Webmail-ga.st.com (10.75.90.48) with Microsoft SMTP Server (TLS) id 14.3.439.0; Thu, 13 Jun 2019 15:50:16 +0200 From: Erwan Le Ray To: Greg Kroah-Hartman , Jiri Slaby , Maxime Coquelin , "Alexandre Torgue" , Rob Herring , "Mark Rutland" Subject: [PATCH v3 04/10] serial: stm32: add pm_runtime support Date: Thu, 13 Jun 2019 15:49:54 +0200 Message-ID: <1560433800-12255-5-git-send-email-erwan.leray@st.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1560433800-12255-1-git-send-email-erwan.leray@st.com> References: <1560433800-12255-1-git-send-email-erwan.leray@st.com> MIME-Version: 1.0 X-Originating-IP: [10.201.23.31] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-06-13_08:, , signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190613_065027_985298_09FD2035 X-CRM114-Status: GOOD ( 13.31 ) 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: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Erwan Le Ray , linux-serial@vger.kernel.org, Bich Hemon , Fabrice Gasnier , linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Use pm_runtime for clock management. Signed-off-by: Bich Hemon Signed-off-by: Erwan Le Ray diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index a8f20ba..41898c4 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -810,13 +810,13 @@ static void stm32_pm(struct uart_port *port, unsigned int state, switch (state) { case UART_PM_STATE_ON: - clk_prepare_enable(stm32port->clk); + pm_runtime_get_sync(port->dev); break; case UART_PM_STATE_OFF: spin_lock_irqsave(&port->lock, flags); stm32_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit)); spin_unlock_irqrestore(&port->lock, flags); - clk_disable_unprepare(stm32port->clk); + pm_runtime_put_sync(port->dev); break; } } @@ -1111,6 +1111,11 @@ static int stm32_serial_probe(struct platform_device *pdev) platform_set_drvdata(pdev, &stm32port->port); + pm_runtime_get_noresume(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + pm_runtime_put_sync(&pdev->dev); + return 0; err_wirq: @@ -1132,6 +1137,9 @@ static int stm32_serial_remove(struct platform_device *pdev) struct uart_port *port = platform_get_drvdata(pdev); struct stm32_port *stm32_port = to_stm32_port(port); struct stm32_usart_offsets *ofs = &stm32_port->info->ofs; + int err; + + pm_runtime_get_sync(&pdev->dev); stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAR); @@ -1160,7 +1168,12 @@ static int stm32_serial_remove(struct platform_device *pdev) clk_disable_unprepare(stm32_port->clk); - return uart_remove_one_port(&stm32_usart_driver, port); + err = uart_remove_one_port(&stm32_usart_driver, port); + + pm_runtime_disable(&pdev->dev); + pm_runtime_put_noidle(&pdev->dev); + + return err; } @@ -1317,7 +1330,29 @@ static int stm32_serial_resume(struct device *dev) } #endif /* CONFIG_PM_SLEEP */ +static int __maybe_unused stm32_serial_runtime_suspend(struct device *dev) +{ + struct uart_port *port = dev_get_drvdata(dev); + struct stm32_port *stm32port = container_of(port, + struct stm32_port, port); + + clk_disable_unprepare(stm32port->clk); + + return 0; +} + +static int __maybe_unused stm32_serial_runtime_resume(struct device *dev) +{ + struct uart_port *port = dev_get_drvdata(dev); + struct stm32_port *stm32port = container_of(port, + struct stm32_port, port); + + return clk_prepare_enable(stm32port->clk); +} + static const struct dev_pm_ops stm32_serial_pm_ops = { + SET_RUNTIME_PM_OPS(stm32_serial_runtime_suspend, + stm32_serial_runtime_resume, NULL) SET_SYSTEM_SLEEP_PM_OPS(stm32_serial_suspend, stm32_serial_resume) };