From patchwork Sat Jul 21 01:12:41 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Greer X-Patchwork-Id: 1222921 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 810233FD4F for ; Sat, 21 Jul 2012 01:13:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753274Ab2GUBNv (ORCPT ); Fri, 20 Jul 2012 21:13:51 -0400 Received: from mail20.dotsterhost.com ([66.11.232.73]:50415 "EHLO mail20.dotsterhost.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753109Ab2GUBNQ (ORCPT ); Fri, 20 Jul 2012 21:13:16 -0400 Received: (qmail 17437 invoked from network); 21 Jul 2012 01:13:15 -0000 Received: from unknown (HELO blue.animalcreek.com) (mgreer@animalcreek.com@[68.2.83.159]) by 66.11.232.73 with SMTP; 21 Jul 2012 01:13:15 -0000 Received: from blue.animalcreek.com (localhost [127.0.0.1]) by blue.animalcreek.com (Postfix) with ESMTP id EE60365C06; Fri, 20 Jul 2012 18:13:14 -0700 (MST) From: "Mark A. Greer" To: netdev@vger.kernel.org Cc: linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, "Mark A. Greer" , Sekhar Nori , Kevin Hilman Subject: [PATCH 2/2] net: ethernet: davinci_emac: add pm_runtime support Date: Fri, 20 Jul 2012 18:12:41 -0700 Message-Id: <1342833161-3314-2-git-send-email-mgreer@animalcreek.com> X-Mailer: git-send-email 1.7.11.2 In-Reply-To: <1342833161-3314-1-git-send-email-mgreer@animalcreek.com> References: <1342833161-3314-1-git-send-email-mgreer@animalcreek.com> Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org From: "Mark A. Greer" Add pm_runtime support to the TI Davinci EMAC driver. CC: Sekhar Nori CC: Kevin Hilman Signed-off-by: Mark A. Greer --- a) Sorry for the bad patch earlier. b) Now applies on top of net-next. c) This patch depends on a patch by Kevin Hilman that has been accepted for 3.6 and is waiting in arm-soc/for-next: ce9dcb8784611c50974d1c6b600c71f5c0a29308 (ARM: davinci: add runtime PM support for clock management) drivers/net/ethernet/ti/davinci_emac.c | 43 +++++++++++++++++----------------- 1 file changed, 22 insertions(+), 21 deletions(-) diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c index 1a9c43f..fce89a0 100644 --- a/drivers/net/ethernet/ti/davinci_emac.c +++ b/drivers/net/ethernet/ti/davinci_emac.c @@ -57,6 +57,7 @@ #include #include #include +#include #include #include #include @@ -353,10 +354,6 @@ struct emac_priv { void (*int_disable) (void); }; -/* clock frequency for EMAC */ -static struct clk *emac_clk; -static unsigned long emac_bus_frequency; - /* EMAC TX Host Error description strings */ static char *emac_txhost_errcodes[16] = { "No error", "SOP error", "Ownership bit not set in SOP buffer", @@ -1540,6 +1537,8 @@ static int emac_dev_open(struct net_device *ndev) int k = 0; struct emac_priv *priv = netdev_priv(ndev); + pm_runtime_get(&priv->pdev->dev); + netif_carrier_off(ndev); for (cnt = 0; cnt < ETH_ALEN; cnt++) ndev->dev_addr[cnt] = priv->mac_addr[cnt]; @@ -1609,7 +1608,7 @@ static int emac_dev_open(struct net_device *ndev) priv->phy_id); ret = PTR_ERR(priv->phydev); priv->phydev = NULL; - return ret; + goto err; } priv->link = 0; @@ -1650,7 +1649,11 @@ rollback: res = platform_get_resource(priv->pdev, IORESOURCE_IRQ, k-1); m = res->end; } - return -EBUSY; + + ret = -EBUSY; +err: + pm_runtime_put(&priv->pdev->dev); + return ret; } /** @@ -1692,6 +1695,7 @@ static int emac_dev_stop(struct net_device *ndev) if (netif_msg_drv(priv)) dev_notice(emac_dev, "DaVinci EMAC: %s stopped\n", ndev->name); + pm_runtime_put(&priv->pdev->dev); return 0; } @@ -1856,6 +1860,9 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev) struct emac_platform_data *pdata; struct device *emac_dev; struct cpdma_params dma_params; + struct clk *emac_clk; + unsigned long emac_bus_frequency; + /* obtain emac clock from kernel */ emac_clk = clk_get(&pdev->dev, NULL); @@ -1864,12 +1871,14 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev) return -EBUSY; } emac_bus_frequency = clk_get_rate(emac_clk); + clk_put(emac_clk); + /* TODO: Probe PHY here if possible */ ndev = alloc_etherdev(sizeof(struct emac_priv)); if (!ndev) { rc = -ENOMEM; - goto free_clk; + goto no_ndev; } platform_set_drvdata(pdev, ndev); @@ -1985,15 +1994,13 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev) SET_ETHTOOL_OPS(ndev, ðtool_ops); netif_napi_add(ndev, &priv->napi, emac_poll, EMAC_POLL_WEIGHT); - clk_enable(emac_clk); - /* register the network device */ SET_NETDEV_DEV(ndev, &pdev->dev); rc = register_netdev(ndev); if (rc) { dev_err(&pdev->dev, "error in register_netdev\n"); rc = -ENODEV; - goto netdev_reg_err; + goto no_irq_res; } @@ -2002,10 +2009,12 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev) "(regs: %p, irq: %d)\n", (void *)priv->emac_base_phys, ndev->irq); } + + pm_runtime_enable(&pdev->dev); + pm_runtime_resume(&pdev->dev); + return 0; -netdev_reg_err: - clk_disable(emac_clk); no_irq_res: if (priv->txchan) cpdma_chan_destroy(priv->txchan); @@ -2019,8 +2028,7 @@ no_dma: probe_quit: free_netdev(ndev); -free_clk: - clk_put(emac_clk); +no_ndev: return rc; } @@ -2054,9 +2062,6 @@ static int __devexit davinci_emac_remove(struct platform_device *pdev) iounmap(priv->remap_addr); free_netdev(ndev); - clk_disable(emac_clk); - clk_put(emac_clk); - return 0; } @@ -2068,8 +2073,6 @@ static int davinci_emac_suspend(struct device *dev) if (netif_running(ndev)) emac_dev_stop(ndev); - clk_disable(emac_clk); - return 0; } @@ -2078,8 +2081,6 @@ static int davinci_emac_resume(struct device *dev) struct platform_device *pdev = to_platform_device(dev); struct net_device *ndev = platform_get_drvdata(pdev); - clk_enable(emac_clk); - if (netif_running(ndev)) emac_dev_open(ndev);