From patchwork Wed Jun 19 11:17:30 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris BREZILLON X-Patchwork-Id: 2748571 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id D8E20C0AB1 for ; Wed, 19 Jun 2013 11:18:46 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B10012035E for ; Wed, 19 Jun 2013 11:18:45 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5173D2035D for ; Wed, 19 Jun 2013 11:18:44 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UpGP4-0001CE-Qi; Wed, 19 Jun 2013 11:18:19 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UpGOo-000835-RC; Wed, 19 Jun 2013 11:18:02 +0000 Received: from 12.mo3.mail-out.ovh.net ([188.165.41.191] helo=mo3.mail-out.ovh.net) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UpGOm-00082h-Kh for linux-arm-kernel@lists.infradead.org; Wed, 19 Jun 2013 11:18:01 +0000 Received: from mail432.ha.ovh.net (b6.ovh.net [213.186.33.56]) by mo3.mail-out.ovh.net (Postfix) with SMTP id 8F1B5FFA09D for ; Wed, 19 Jun 2013 13:17:38 +0200 (CEST) Received: from b0.ovh.net (HELO queueout) (213.186.33.50) by b0.ovh.net with SMTP; 19 Jun 2013 13:18:18 +0200 Received: from unknown (HELO bbrezillon-laptop.private.s2ih) (b.brezillon@overkiz.com@80.245.18.66) by ns0.ovh.net with SMTP; 19 Jun 2013 13:18:17 +0200 From: Boris BREZILLON To: Nicolas Ferre , Ludovic Desroches , Jean-Christophe Plagniol-Villard , Greg Kroah-Hartman , Jiri Slaby X-Ovh-Mailout: 178.32.228.3 (mo3.mail-out.ovh.net) Subject: [PATCH 4/8] tty: atmel_serial: prepare clk before calling enable Date: Wed, 19 Jun 2013 13:17:30 +0200 Message-Id: <1371640650-9625-1-git-send-email-b.brezillon@overkiz.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1371640263-9268-1-git-send-email-b.brezillon@overkiz.com> References: <1371640263-9268-1-git-send-email-b.brezillon@overkiz.com> X-Ovh-Tracer-Id: 10626524797590009964 X-Ovh-Remote: 80.245.18.66 () X-Ovh-Local: 213.186.33.20 (ns0.ovh.net) X-OVH-SPAMSTATE: OK X-OVH-SPAMSCORE: -100 X-OVH-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeeiiedrjedtucetufdoteggodetrfcurfhrohhfihhlvgemucfqggfjnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd X-Spam-Check: DONE|U 0.5/N X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeeiiedrjedtucetufdoteggodetrfcurfhrohhfihhlvgemucfqggfjnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130619_071800_880059_C6FC4A20 X-CRM114-Status: GOOD ( 20.44 ) X-Spam-Score: -1.9 (-) Cc: Boris BREZILLON , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-serial@vger.kernel.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-5.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Replace clk_enable/disable with clk_prepare_enable/disable_unprepare to avoid common clk framework warnings. Signed-off-by: Boris BREZILLON Acked-by: Nicolas Ferre --- drivers/tty/serial/atmel_serial.c | 41 ++++++++++++++++++++++++++++--------- 1 file changed, 31 insertions(+), 10 deletions(-) diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 3467462..691265f 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -1100,7 +1100,7 @@ static void atmel_serial_pm(struct uart_port *port, unsigned int state, * Enable the peripheral clock for this serial port. * This is called on uart_open() or a resume event. */ - clk_enable(atmel_port->clk); + clk_prepare_enable(atmel_port->clk); /* re-enable interrupts if we disabled some on suspend */ UART_PUT_IER(port, atmel_port->backup_imr); @@ -1114,7 +1114,7 @@ static void atmel_serial_pm(struct uart_port *port, unsigned int state, * Disable the peripheral clock for this serial port. * This is called on uart_close() or a suspend event. */ - clk_disable(atmel_port->clk); + clk_disable_unprepare(atmel_port->clk); break; default: printk(KERN_ERR "atmel_serial: unknown pm %d\n", state); @@ -1458,9 +1458,10 @@ static void atmel_of_init_port(struct atmel_uart_port *atmel_port, /* * Configure the port from the platform device resource info. */ -static void atmel_init_port(struct atmel_uart_port *atmel_port, +static int atmel_init_port(struct atmel_uart_port *atmel_port, struct platform_device *pdev) { + int ret; struct uart_port *port = &atmel_port->uart; struct atmel_uart_data *pdata = pdev->dev.platform_data; @@ -1496,9 +1497,19 @@ static void atmel_init_port(struct atmel_uart_port *atmel_port, /* for console, the clock could already be configured */ if (!atmel_port->clk) { atmel_port->clk = clk_get(&pdev->dev, "usart"); - clk_enable(atmel_port->clk); + if (IS_ERR(atmel_port->clk)) { + ret = PTR_ERR(atmel_port->clk); + atmel_port->clk = NULL; + return ret; + } + ret = clk_prepare_enable(atmel_port->clk); + if (ret) { + clk_put(atmel_port->clk); + atmel_port->clk = NULL; + return ret; + } port->uartclk = clk_get_rate(atmel_port->clk); - clk_disable(atmel_port->clk); + clk_disable_unprepare(atmel_port->clk); /* only enable clock when USART is in use */ } @@ -1511,6 +1522,8 @@ static void atmel_init_port(struct atmel_uart_port *atmel_port, } else { atmel_port->tx_done_mask = ATMEL_US_TXRDY; } + + return 0; } struct platform_device *atmel_default_console_device; /* the serial console device */ @@ -1601,6 +1614,7 @@ static void __init atmel_console_get_options(struct uart_port *port, int *baud, static int __init atmel_console_setup(struct console *co, char *options) { + int ret; struct uart_port *port = &atmel_ports[co->index].uart; int baud = 115200; int bits = 8; @@ -1612,7 +1626,9 @@ static int __init atmel_console_setup(struct console *co, char *options) return -ENODEV; } - clk_enable(atmel_ports[co->index].clk); + ret = clk_prepare_enable(atmel_ports[co->index].clk); + if (ret) + return ret; UART_PUT_IDR(port, -1); UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX); @@ -1645,6 +1661,7 @@ static struct console atmel_console = { */ static int __init atmel_console_init(void) { + int ret; if (atmel_default_console_device) { struct atmel_uart_data *pdata = atmel_default_console_device->dev.platform_data; @@ -1655,7 +1672,9 @@ static int __init atmel_console_init(void) port->uart.line = id; add_preferred_console(ATMEL_DEVICENAME, id, NULL); - atmel_init_port(port, atmel_default_console_device); + ret = atmel_init_port(port, atmel_default_console_device); + if (ret) + return ret; register_console(&atmel_console); } @@ -1786,7 +1805,9 @@ static int atmel_serial_probe(struct platform_device *pdev) port->backup_imr = 0; port->uart.line = ret; - atmel_init_port(port, pdev); + ret = atmel_init_port(port, pdev); + if (ret) + goto err; pinctrl = devm_pinctrl_get_select_default(&pdev->dev); if (IS_ERR(pinctrl)) { @@ -1812,9 +1833,9 @@ static int atmel_serial_probe(struct platform_device *pdev) && ATMEL_CONSOLE_DEVICE->flags & CON_ENABLED) { /* * The serial core enabled the clock for us, so undo - * the clk_enable() in atmel_console_setup() + * the clk_prepare_enable() in atmel_console_setup() */ - clk_disable(port->clk); + clk_disable_unprepare(port->clk); } #endif