From mboxrd@z Thu Jan 1 00:00:00 1970 From: Huang Shijie Subject: [PATCH v2] serial: imx: remove the uart_console() check Date: Fri, 28 Jun 2013 13:39:42 +0800 Message-ID: <1372397982-19017-1-git-send-email-b32955@freescale.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from co1ehsobe004.messaging.microsoft.com ([216.32.180.187]:37809 "EHLO co1outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753827Ab3F1GFF (ORCPT ); Fri, 28 Jun 2013 02:05:05 -0400 Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: gregkh@linuxfoundation.org Cc: linux-serial@vger.kernel.org, shawn.guo@linaro.org, linux-arm-kernel@lists.infradead.org, fabio.estevam@freescale.com, Huang Shijie The uart_console() check makes the clocks(clk_per and clk_ipg) opened even when we close the console uart. This patch enable/disable the clocks in imx_console_write(), so we can keep the clocks closed when the console uart is closed. Also remove the clock enable/disable oprations in the probe, we do not need them any more. Signed-off-by: Huang Shijie --- v1 --> v2: [0] Squash the two patch into one patch. [1] only enable the ipg clock in the imx_console_setup(). [2] remove all the clock oprations in probe(). --- drivers/tty/serial/imx.c | 69 ++++++++++++++++++++++++++++----------------- 1 files changed, 43 insertions(+), 26 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 415cec6..48bace0 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -702,15 +702,13 @@ static int imx_startup(struct uart_port *port) int retval; unsigned long flags, temp; - if (!uart_console(port)) { - retval = clk_prepare_enable(sport->clk_per); - if (retval) - goto error_out1; - retval = clk_prepare_enable(sport->clk_ipg); - if (retval) { - clk_disable_unprepare(sport->clk_per); - goto error_out1; - } + retval = clk_prepare_enable(sport->clk_per); + if (retval) + goto error_out1; + retval = clk_prepare_enable(sport->clk_ipg); + if (retval) { + clk_disable_unprepare(sport->clk_per); + goto error_out1; } imx_setup_ufcr(sport, 0); @@ -901,10 +899,8 @@ static void imx_shutdown(struct uart_port *port) writel(temp, sport->port.membase + UCR1); spin_unlock_irqrestore(&sport->port.lock, flags); - if (!uart_console(&sport->port)) { - clk_disable_unprepare(sport->clk_per); - clk_disable_unprepare(sport->clk_ipg); - } + clk_disable_unprepare(sport->clk_per); + clk_disable_unprepare(sport->clk_ipg); } static void @@ -1251,6 +1247,16 @@ imx_console_write(struct console *co, const char *s, unsigned int count) unsigned int ucr1; unsigned long flags = 0; int locked = 1; + int retval; + + retval = clk_enable(sport->clk_per); + if (retval) + return; + retval = clk_enable(sport->clk_ipg); + if (retval) { + clk_disable(sport->clk_per); + return; + } if (sport->port.sysrq) locked = 0; @@ -1286,6 +1292,9 @@ imx_console_write(struct console *co, const char *s, unsigned int count) if (locked) spin_unlock_irqrestore(&sport->port.lock, flags); + + clk_disable(sport->clk_ipg); + clk_disable(sport->clk_per); } /* @@ -1359,6 +1368,7 @@ imx_console_setup(struct console *co, char *options) int bits = 8; int parity = 'n'; int flow = 'n'; + int retval; /* * Check whether an invalid uart number has been specified, and @@ -1371,6 +1381,11 @@ imx_console_setup(struct console *co, char *options) if (sport == NULL) return -ENODEV; + /* For setting the registers, we only need to enable the ipg clock. */ + retval = clk_prepare_enable(sport->clk_ipg); + if (retval) + goto error_console; + if (options) uart_parse_options(options, &baud, &parity, &bits, &flow); else @@ -1378,7 +1393,20 @@ imx_console_setup(struct console *co, char *options) imx_setup_ufcr(sport, 0); - return uart_set_options(&sport->port, co, baud, parity, bits, flow); + retval = uart_set_options(&sport->port, co, baud, parity, bits, flow); + + clk_disable(sport->clk_ipg); + if (retval) { + clk_unprepare(sport->clk_ipg); + goto error_console; + } + + retval = clk_prepare(sport->clk_per); + if (retval) + clk_disable_unprepare(sport->clk_ipg); + +error_console: + return retval; } static struct uart_driver imx_reg; @@ -1564,9 +1592,6 @@ static int serial_imx_probe(struct platform_device *pdev) return ret; } - clk_prepare_enable(sport->clk_per); - clk_prepare_enable(sport->clk_ipg); - sport->port.uartclk = clk_get_rate(sport->clk_per); imx_ports[sport->port.line] = sport; @@ -1575,7 +1600,7 @@ static int serial_imx_probe(struct platform_device *pdev) if (pdata && pdata->init) { ret = pdata->init(pdev); if (ret) - goto clkput; + return ret; } ret = uart_add_one_port(&imx_reg, &sport->port); @@ -1583,18 +1608,10 @@ static int serial_imx_probe(struct platform_device *pdev) goto deinit; platform_set_drvdata(pdev, sport); - if (!uart_console(&sport->port)) { - clk_disable_unprepare(sport->clk_per); - clk_disable_unprepare(sport->clk_ipg); - } - return 0; deinit: if (pdata && pdata->exit) pdata->exit(pdev); -clkput: - clk_disable_unprepare(sport->clk_per); - clk_disable_unprepare(sport->clk_ipg); return ret; } -- 1.7.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: b32955@freescale.com (Huang Shijie) Date: Fri, 28 Jun 2013 13:39:42 +0800 Subject: [PATCH v2] serial: imx: remove the uart_console() check Message-ID: <1372397982-19017-1-git-send-email-b32955@freescale.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org The uart_console() check makes the clocks(clk_per and clk_ipg) opened even when we close the console uart. This patch enable/disable the clocks in imx_console_write(), so we can keep the clocks closed when the console uart is closed. Also remove the clock enable/disable oprations in the probe, we do not need them any more. Signed-off-by: Huang Shijie --- v1 --> v2: [0] Squash the two patch into one patch. [1] only enable the ipg clock in the imx_console_setup(). [2] remove all the clock oprations in probe(). --- drivers/tty/serial/imx.c | 69 ++++++++++++++++++++++++++++----------------- 1 files changed, 43 insertions(+), 26 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 415cec6..48bace0 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -702,15 +702,13 @@ static int imx_startup(struct uart_port *port) int retval; unsigned long flags, temp; - if (!uart_console(port)) { - retval = clk_prepare_enable(sport->clk_per); - if (retval) - goto error_out1; - retval = clk_prepare_enable(sport->clk_ipg); - if (retval) { - clk_disable_unprepare(sport->clk_per); - goto error_out1; - } + retval = clk_prepare_enable(sport->clk_per); + if (retval) + goto error_out1; + retval = clk_prepare_enable(sport->clk_ipg); + if (retval) { + clk_disable_unprepare(sport->clk_per); + goto error_out1; } imx_setup_ufcr(sport, 0); @@ -901,10 +899,8 @@ static void imx_shutdown(struct uart_port *port) writel(temp, sport->port.membase + UCR1); spin_unlock_irqrestore(&sport->port.lock, flags); - if (!uart_console(&sport->port)) { - clk_disable_unprepare(sport->clk_per); - clk_disable_unprepare(sport->clk_ipg); - } + clk_disable_unprepare(sport->clk_per); + clk_disable_unprepare(sport->clk_ipg); } static void @@ -1251,6 +1247,16 @@ imx_console_write(struct console *co, const char *s, unsigned int count) unsigned int ucr1; unsigned long flags = 0; int locked = 1; + int retval; + + retval = clk_enable(sport->clk_per); + if (retval) + return; + retval = clk_enable(sport->clk_ipg); + if (retval) { + clk_disable(sport->clk_per); + return; + } if (sport->port.sysrq) locked = 0; @@ -1286,6 +1292,9 @@ imx_console_write(struct console *co, const char *s, unsigned int count) if (locked) spin_unlock_irqrestore(&sport->port.lock, flags); + + clk_disable(sport->clk_ipg); + clk_disable(sport->clk_per); } /* @@ -1359,6 +1368,7 @@ imx_console_setup(struct console *co, char *options) int bits = 8; int parity = 'n'; int flow = 'n'; + int retval; /* * Check whether an invalid uart number has been specified, and @@ -1371,6 +1381,11 @@ imx_console_setup(struct console *co, char *options) if (sport == NULL) return -ENODEV; + /* For setting the registers, we only need to enable the ipg clock. */ + retval = clk_prepare_enable(sport->clk_ipg); + if (retval) + goto error_console; + if (options) uart_parse_options(options, &baud, &parity, &bits, &flow); else @@ -1378,7 +1393,20 @@ imx_console_setup(struct console *co, char *options) imx_setup_ufcr(sport, 0); - return uart_set_options(&sport->port, co, baud, parity, bits, flow); + retval = uart_set_options(&sport->port, co, baud, parity, bits, flow); + + clk_disable(sport->clk_ipg); + if (retval) { + clk_unprepare(sport->clk_ipg); + goto error_console; + } + + retval = clk_prepare(sport->clk_per); + if (retval) + clk_disable_unprepare(sport->clk_ipg); + +error_console: + return retval; } static struct uart_driver imx_reg; @@ -1564,9 +1592,6 @@ static int serial_imx_probe(struct platform_device *pdev) return ret; } - clk_prepare_enable(sport->clk_per); - clk_prepare_enable(sport->clk_ipg); - sport->port.uartclk = clk_get_rate(sport->clk_per); imx_ports[sport->port.line] = sport; @@ -1575,7 +1600,7 @@ static int serial_imx_probe(struct platform_device *pdev) if (pdata && pdata->init) { ret = pdata->init(pdev); if (ret) - goto clkput; + return ret; } ret = uart_add_one_port(&imx_reg, &sport->port); @@ -1583,18 +1608,10 @@ static int serial_imx_probe(struct platform_device *pdev) goto deinit; platform_set_drvdata(pdev, sport); - if (!uart_console(&sport->port)) { - clk_disable_unprepare(sport->clk_per); - clk_disable_unprepare(sport->clk_ipg); - } - return 0; deinit: if (pdata && pdata->exit) pdata->exit(pdev); -clkput: - clk_disable_unprepare(sport->clk_per); - clk_disable_unprepare(sport->clk_ipg); return ret; } -- 1.7.1