From patchwork Fri Jul 1 03:25:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hongxing Zhu X-Patchwork-Id: 12902623 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 575D6C433EF for ; Fri, 1 Jul 2022 03:40:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234100AbiGADkk (ORCPT ); Thu, 30 Jun 2022 23:40:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50728 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232303AbiGADkh (ORCPT ); Thu, 30 Jun 2022 23:40:37 -0400 Received: from inva021.nxp.com (inva021.nxp.com [92.121.34.21]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 88B7765D4C; Thu, 30 Jun 2022 20:40:36 -0700 (PDT) Received: from inva021.nxp.com (localhost [127.0.0.1]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 4A8FB2035C1; Fri, 1 Jul 2022 05:40:35 +0200 (CEST) Received: from aprdc01srsp001v.ap-rdc01.nxp.com (aprdc01srsp001v.ap-rdc01.nxp.com [165.114.16.16]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id DEDC52035BE; Fri, 1 Jul 2022 05:40:34 +0200 (CEST) Received: from localhost.localdomain (shlinux2.ap.freescale.net [10.192.224.44]) by aprdc01srsp001v.ap-rdc01.nxp.com (Postfix) with ESMTP id 4FAEC1820F58; Fri, 1 Jul 2022 11:40:33 +0800 (+08) From: Richard Zhu To: l.stach@pengutronix.de, bhelgaas@google.com, robh+dt@kernel.org, broonie@kernel.org, lorenzo.pieralisi@arm.com, festevam@gmail.com, francesco.dolcini@toradex.com Cc: hongxing.zhu@nxp.com, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kernel@pengutronix.de, linux-imx@nxp.com Subject: [PATCH v14 17/17] PCI: imx6: Reformat suspend callback to keep symmetric with resume Date: Fri, 1 Jul 2022 11:25:35 +0800 Message-Id: <1656645935-1370-18-git-send-email-hongxing.zhu@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1656645935-1370-1-git-send-email-hongxing.zhu@nxp.com> References: <1656645935-1370-1-git-send-email-hongxing.zhu@nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Create imx6_pcie_stop_link() and imx6_pcie_host_exit() functions. Encapsulate clocks, regulators disables and PHY uninitialization into imx6_pcie_host_exit(). To keep suspend/resume symmetric as much as possible, invoke these two new created functions in suspend callback. To be symmetric with imx6_pcie_host_exit(), move imx6_pcie_clk_enable() to imx6_pcie_host_init() from imx6_pcie_deassert_core_reset(). Signed-off-by: Richard Zhu Reviewed-by: Lucas Stach --- drivers/pci/controller/dwc/pci-imx6.c | 60 ++++++++++++++++----------- 1 file changed, 36 insertions(+), 24 deletions(-) diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 1cf8bf9035f2..bf8992a6c238 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -703,13 +703,6 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie) { struct dw_pcie *pci = imx6_pcie->pci; struct device *dev = pci->dev; - int ret; - - ret = imx6_pcie_clk_enable(imx6_pcie); - if (ret) { - dev_err(dev, "unable to enable pcie clocks: %d\n", ret); - return ret; - } switch (imx6_pcie->drvdata->variant) { case IMX8MQ: @@ -905,6 +898,14 @@ static int imx6_pcie_start_link(struct dw_pcie *pci) return 0; } +static void imx6_pcie_stop_link(struct dw_pcie *pci) +{ + struct device *dev = pci->dev; + + /* Turn off PCIe LTSSM */ + imx6_pcie_ltssm_disable(dev); +} + static int imx6_pcie_host_init(struct pcie_port *pp) { struct dw_pcie *pci = to_dw_pcie_from_pp(pp); @@ -922,11 +923,17 @@ static int imx6_pcie_host_init(struct pcie_port *pp) return ret; } } + ret = imx6_pcie_clk_enable(imx6_pcie); + if (ret) { + dev_err(dev, "unable to enable pcie clocks: %d\n", ret); + goto err_reg_disable; + } + if (imx6_pcie->phy) { ret = phy_power_on(imx6_pcie->phy); if (ret) { dev_err(dev, "pcie phy power up failed.\n"); - goto err_reg_disable; + goto err_clk_disable; } } @@ -947,17 +954,33 @@ static int imx6_pcie_host_init(struct pcie_port *pp) return 0; -err_clk_disable: - imx6_pcie_clk_disable(imx6_pcie); err_phy_off: if (imx6_pcie->phy) phy_power_off(imx6_pcie->phy); +err_clk_disable: + imx6_pcie_clk_disable(imx6_pcie); err_reg_disable: if (imx6_pcie->vpcie) regulator_disable(imx6_pcie->vpcie); return ret; } +static void imx6_pcie_host_exit(struct pcie_port *pp) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci); + + if (imx6_pcie->phy) { + if (phy_power_off(imx6_pcie->phy)) + dev_err(pci->dev, "unable to power off PHY\n"); + phy_exit(imx6_pcie->phy); + } + imx6_pcie_clk_disable(imx6_pcie); + + if (imx6_pcie->vpcie) + regulator_disable(imx6_pcie->vpcie); +} + static const struct dw_pcie_host_ops imx6_pcie_host_ops = { .host_init = imx6_pcie_host_init, }; @@ -1007,25 +1030,14 @@ static void imx6_pcie_pm_turnoff(struct imx6_pcie *imx6_pcie) static int imx6_pcie_suspend_noirq(struct device *dev) { struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev); + struct pcie_port *pp = &imx6_pcie->pci->pp; if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_SUPPORTS_SUSPEND)) return 0; imx6_pcie_pm_turnoff(imx6_pcie); - imx6_pcie_ltssm_disable(dev); - imx6_pcie_clk_disable(imx6_pcie); - switch (imx6_pcie->drvdata->variant) { - case IMX8MM: - if (phy_power_off(imx6_pcie->phy)) - dev_err(dev, "unable to power off PHY\n"); - phy_exit(imx6_pcie->phy); - break; - default: - break; - } - - if (imx6_pcie->vpcie) - regulator_disable(imx6_pcie->vpcie); + imx6_pcie_stop_link(imx6_pcie->pci); + imx6_pcie_host_exit(pp); return 0; }