From patchwork Thu Nov 27 13:08:53 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Appana Durga Kedareswara rao X-Patchwork-Id: 5396211 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 0B5F49F39B for ; Thu, 27 Nov 2014 13:11:20 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 06823201C7 for ; Thu, 27 Nov 2014 13:11:19 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E3BB8201C0 for ; Thu, 27 Nov 2014 13:11:17 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XtypC-0004RS-3t; Thu, 27 Nov 2014 13:09:34 +0000 Received: from mail-bn1on0068.outbound.protection.outlook.com ([157.56.110.68] helo=na01-bn1-obe.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Xtyp5-0004Kd-V7 for linux-arm-kernel@lists.infradead.org; Thu, 27 Nov 2014 13:09:29 +0000 Received: from BN1BFFO11FD038.protection.gbl (10.58.144.32) by BN1BFFO11HUB058.protection.gbl (10.58.144.205) with Microsoft SMTP Server (TLS) id 15.1.6.13; Thu, 27 Nov 2014 13:09:05 +0000 Received: from xsj-pvapsmtpgw01 (149.199.60.83) by BN1BFFO11FD038.mail.protection.outlook.com (10.58.144.101) with Microsoft SMTP Server (TLS) id 15.1.6.13 via Frontend Transport; Thu, 27 Nov 2014 13:09:04 +0000 Received: from unknown-38-66.xilinx.com ([149.199.38.66] helo=xsj-pvapsmtp01) by xsj-pvapsmtpgw01 with esmtp (Exim 4.63) (envelope-from ) id 1XtymH-0003du-4b; Thu, 27 Nov 2014 05:06:33 -0800 From: Kedareswara rao Appana To: , , , , , Subject: [PATCH v3] can: Convert to runtime_pm Date: Thu, 27 Nov 2014 18:38:53 +0530 X-Mailer: git-send-email 1.7.4 X-RCIS-Action: ALLOW X-TM-AS-Product-Ver: IMSS-7.1.0.1224-7.5.0.1018-21132.006 X-TM-AS-User-Approved-Sender: Yes;Yes Message-ID: <6b6db31d46074512a322eae6e4ef64d4@BN1BFFO11FD038.protection.gbl> X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:149.199.60.83; CTRY:US; IPV:NLI; EFV:NLI; SFV:NSPM; SFS:(10009020)(6009001)(438002)(189002)(199003)(19580405001)(95666004)(50466002)(106466001)(2201001)(77096003)(93916002)(87936001)(50226001)(99396003)(64706001)(92566001)(21056001)(46102003)(120916001)(4396001)(107046002)(47776003)(77156002)(53416004)(89996001)(44976005)(31966008)(88136002)(33646002)(104166001)(20776003)(19580395003)(104016003)(108616004)(229853001)(74316001)(48376002)(50986999)(87286001)(6806004)(102836001)(86362001)(62966003)(107986001)(24736002)(2101003)(23106004); DIR:OUT; SFP:1101; SCL:1; SRVR:BN1BFFO11HUB058; H:xsj-pvapsmtpgw01; FPR:; MLV:sfv; PTR:unknown-60-83.xilinx.com; MX:1; A:1; LANG:en; MIME-Version: 1.0 X-Microsoft-Antispam: UriScan:; X-Microsoft-Antispam: BCL:0;PCL:0;RULEID:;SRVR:BN1BFFO11HUB058; X-Exchange-Antispam-Report-Test: UriScan:; X-Exchange-Antispam-Report-CFA-Test: BCL:0; PCL:0; RULEID:; SRVR:BN1BFFO11HUB058; X-Forefront-PRVS: 040866B734 Received-SPF: Pass (protection.outlook.com: domain of xilinx.com designates 149.199.60.83 as permitted sender) receiver=protection.outlook.com; client-ip=149.199.60.83; helo=xsj-pvapsmtpgw01; Authentication-Results: spf=pass (sender IP is 149.199.60.83) smtp.mailfrom=appana.durga.rao@xilinx.com; X-Exchange-Antispam-Report-CFA-Test: BCL:0; PCL:0; RULEID:; SRVR:BN1BFFO11HUB058; X-OriginatorOrg: xilinx.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20141127_050928_234041_78910C6E X-CRM114-Status: GOOD ( 14.93 ) X-Spam-Score: -0.0 (/) Cc: devicetree@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-can@vger.kernel.org, Kedareswara rao Appana , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_LOW, T_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 Instead of enabling/disabling clocks at several locations in the driver, use the runtime_pm framework. This consolidates the actions for runtime PM in the appropriate callbacks and makes the driver more readable and mantainable. Signed-off-by: Soren Brinkmann Signed-off-by: Kedareswara rao Appana --- Changes for v3: - Converted the driver to use runtime_pm. Changes for v2: - Removed the struct platform_device* from suspend/resume as suggest by Lothar. drivers/net/can/xilinx_can.c | 119 +++++++++++++++++++++++++---------------- 1 files changed, 72 insertions(+), 47 deletions(-) diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c index 8a998e3..1be28ed 100644 --- a/drivers/net/can/xilinx_can.c +++ b/drivers/net/can/xilinx_can.c @@ -32,6 +32,7 @@ #include #include #include +#include #define DRIVER_NAME "xilinx_can" @@ -138,7 +139,7 @@ struct xcan_priv { u32 (*read_reg)(const struct xcan_priv *priv, enum xcan_reg reg); void (*write_reg)(const struct xcan_priv *priv, enum xcan_reg reg, u32 val); - struct net_device *dev; + struct device *dev; void __iomem *reg_base; unsigned long irq_flags; struct clk *bus_clk; @@ -842,6 +843,13 @@ static int xcan_open(struct net_device *ndev) struct xcan_priv *priv = netdev_priv(ndev); int ret; + ret = pm_runtime_get_sync(priv->dev); + if (ret < 0) { + netdev_err(ndev, "%s: runtime CAN resume failed(%d)\n\r", + __func__, ret); + return ret; + } + ret = request_irq(ndev->irq, xcan_interrupt, priv->irq_flags, ndev->name, ndev); if (ret < 0) { @@ -849,29 +857,17 @@ static int xcan_open(struct net_device *ndev) goto err; } - ret = clk_prepare_enable(priv->can_clk); - if (ret) { - netdev_err(ndev, "unable to enable device clock\n"); - goto err_irq; - } - - ret = clk_prepare_enable(priv->bus_clk); - if (ret) { - netdev_err(ndev, "unable to enable bus clock\n"); - goto err_can_clk; - } - /* Set chip into reset mode */ ret = set_reset_mode(ndev); if (ret < 0) { netdev_err(ndev, "mode resetting failed!\n"); - goto err_bus_clk; + goto err_irq; } /* Common open */ ret = open_candev(ndev); if (ret) - goto err_bus_clk; + goto err_irq; ret = xcan_chip_start(ndev); if (ret < 0) { @@ -887,13 +883,11 @@ static int xcan_open(struct net_device *ndev) err_candev: close_candev(ndev); -err_bus_clk: - clk_disable_unprepare(priv->bus_clk); -err_can_clk: - clk_disable_unprepare(priv->can_clk); err_irq: free_irq(ndev->irq, ndev); err: + pm_runtime_put(priv->dev); + return ret; } @@ -910,12 +904,11 @@ static int xcan_close(struct net_device *ndev) netif_stop_queue(ndev); napi_disable(&priv->napi); xcan_chip_stop(ndev); - clk_disable_unprepare(priv->bus_clk); - clk_disable_unprepare(priv->can_clk); free_irq(ndev->irq, ndev); close_candev(ndev); can_led_event(ndev, CAN_LED_EVENT_STOP); + pm_runtime_put(priv->dev); return 0; } @@ -934,27 +927,21 @@ static int xcan_get_berr_counter(const struct net_device *ndev, struct xcan_priv *priv = netdev_priv(ndev); int ret; - ret = clk_prepare_enable(priv->can_clk); - if (ret) - goto err; + ret = pm_runtime_get_sync(priv->dev); + if (ret < 0) { + netdev_err(ndev, "%s: runtime resume failed(%d)\n\r", + __func__, ret); + return ret; + } - ret = clk_prepare_enable(priv->bus_clk); - if (ret) - goto err_clk; bec->txerr = priv->read_reg(priv, XCAN_ECR_OFFSET) & XCAN_ECR_TEC_MASK; bec->rxerr = ((priv->read_reg(priv, XCAN_ECR_OFFSET) & XCAN_ECR_REC_MASK) >> XCAN_ESR_REC_SHIFT); - clk_disable_unprepare(priv->bus_clk); - clk_disable_unprepare(priv->can_clk); + pm_runtime_put(priv->dev); return 0; - -err_clk: - clk_disable_unprepare(priv->can_clk); -err: - return ret; } @@ -967,15 +954,45 @@ static const struct net_device_ops xcan_netdev_ops = { /** * xcan_suspend - Suspend method for the driver - * @dev: Address of the platform_device structure + * @dev: Address of the net_device structure * * Put the driver into low power mode. - * Return: 0 always + * Return: 0 on success and failure value on error */ static int __maybe_unused xcan_suspend(struct device *dev) { - struct platform_device *pdev = dev_get_drvdata(dev); - struct net_device *ndev = platform_get_drvdata(pdev); + if (!device_may_wakeup(dev)) + return pm_runtime_force_suspend(dev); + + return 0; +} + +/** + * xcan_resume - Resume from suspend + * @dev: Address of the net_device structure + * + * Resume operation after suspend. + * Return: 0 on success and failure value on error + */ +static int __maybe_unused xcan_resume(struct device *dev) +{ + if (!device_may_wakeup(dev)) + return pm_runtime_force_resume(dev); + + return 0; + +} + +/** + * xcan_runtime_suspend - Runtime suspend method for the driver + * @dev: Address of the net_device structure + * + * Put the driver into low power mode. + * Return: 0 always + */ +static int __maybe_unused xcan_runtime_suspend(struct device *dev) +{ + struct net_device *ndev = dev_get_drvdata(dev); struct xcan_priv *priv = netdev_priv(ndev); if (netif_running(ndev)) { @@ -993,16 +1010,15 @@ static int __maybe_unused xcan_suspend(struct device *dev) } /** - * xcan_resume - Resume from suspend - * @dev: Address of the platformdevice structure + * xcan_runtime_resume - Runtime resume from suspend + * @dev: Address of the net_device structure * * Resume operation after suspend. * Return: 0 on success and failure value on error */ -static int __maybe_unused xcan_resume(struct device *dev) +static int __maybe_unused xcan_runtime_resume(struct device *dev) { - struct platform_device *pdev = dev_get_drvdata(dev); - struct net_device *ndev = platform_get_drvdata(pdev); + struct net_device *ndev = dev_get_drvdata(dev); struct xcan_priv *priv = netdev_priv(ndev); int ret; @@ -1030,7 +1046,10 @@ static int __maybe_unused xcan_resume(struct device *dev) return 0; } -static SIMPLE_DEV_PM_OPS(xcan_dev_pm_ops, xcan_suspend, xcan_resume); +static const struct dev_pm_ops xcan_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(xcan_suspend, xcan_resume) + SET_PM_RUNTIME_PM_OPS(xcan_runtime_suspend, xcan_runtime_resume, NULL) +}; /** * xcan_probe - Platform registration call @@ -1071,7 +1090,7 @@ static int xcan_probe(struct platform_device *pdev) return -ENOMEM; priv = netdev_priv(ndev); - priv->dev = ndev; + priv->dev = &pdev->dev; priv->can.bittiming_const = &xcan_bittiming_const; priv->can.do_set_mode = xcan_do_set_mode; priv->can.do_get_berr_counter = xcan_get_berr_counter; @@ -1137,6 +1156,11 @@ static int xcan_probe(struct platform_device *pdev) netif_napi_add(ndev, &priv->napi, xcan_rx_poll, rx_max); + pm_runtime_set_active(&pdev->dev); + pm_runtime_irq_safe(&pdev->dev); + pm_runtime_enable(&pdev->dev); + pm_runtime_get_sync(&pdev->dev); + ret = register_candev(ndev); if (ret) { dev_err(&pdev->dev, "fail to register failed (err=%d)\n", ret); @@ -1144,8 +1168,9 @@ static int xcan_probe(struct platform_device *pdev) } devm_can_led_init(ndev); - clk_disable_unprepare(priv->bus_clk); - clk_disable_unprepare(priv->can_clk); + + pm_runtime_put(&pdev->dev); + netdev_dbg(ndev, "reg_base=0x%p irq=%d clock=%d, tx fifo depth:%d\n", priv->reg_base, ndev->irq, priv->can.clock.freq, priv->tx_max);