From patchwork Thu Jul 14 07:31:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hongxing Zhu X-Patchwork-Id: 12917427 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B8192C43334 for ; Thu, 14 Jul 2022 07:55:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=B9VjAXVJB7T8XaYCi3rriI2e9LUndBo/+mcQKl+IBp4=; b=m5zWYsB5bZCl/q 59eJGX1wfSSKFo1yJ/VXOd0yU8PfPAGjEKrR4GUU2LKRDqi8iYDG9NwoA2nbotRhIqTspwSTsNOW8 8cCUxKeCaKxYwORXQcABhkJkQCCDo4uUdoTO7YHkQUOEfQu3vcBkHsQXkNx0OVzr7pZr5mXeFlHgi lsx/QPUVKiRpSZVVdH6tLqfJTVgsoSyEdRAe7hJPjH7FRaY8Q2KMxrmuEsoEcWh6q7Ut7HTGRPw5b JwuRfSa/u2g+IeS8S8CebvtoO0AoxDFQr33FP5S6eyMhqVaIuP+VWoGb/1X6WbJzunzlZNdNFf1VP K25hWIf4Db8No6hW6lvw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oBtfZ-00C3OO-10; Thu, 14 Jul 2022 07:53:57 +0000 Received: from inva020.nxp.com ([92.121.34.13]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oBtZ5-00BypP-N0 for linux-arm-kernel@lists.infradead.org; Thu, 14 Jul 2022 07:47:17 +0000 Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 78BA21A2049; Thu, 14 Jul 2022 09:47:14 +0200 (CEST) Received: from aprdc01srsp001v.ap-rdc01.nxp.com (aprdc01srsp001v.ap-rdc01.nxp.com [165.114.16.16]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 12BDE1A2034; Thu, 14 Jul 2022 09:47:14 +0200 (CEST) Received: from localhost.localdomain (shlinux2.ap.freescale.net [10.192.224.44]) by aprdc01srsp001v.ap-rdc01.nxp.com (Postfix) with ESMTP id 6AD0F180327D; Thu, 14 Jul 2022 15:47:12 +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 v15 17/17] PCI: imx6: Reformat suspend callback to keep symmetric with resume Date: Thu, 14 Jul 2022 15:31:09 +0800 Message-Id: <1657783869-19194-18-git-send-email-hongxing.zhu@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1657783869-19194-1-git-send-email-hongxing.zhu@nxp.com> References: <1657783869-19194-1-git-send-email-hongxing.zhu@nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220714_004716_078575_87122D2D X-CRM114-Status: GOOD ( 14.22 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 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+linux-arm-kernel=archiver.kernel.org@lists.infradead.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(). Link: https://lore.kernel.org/r/1656645935-1370-18-git-send-email-hongxing.zhu@nxp.com Signed-off-by: Richard Zhu Signed-off-by: Bjorn Helgaas Reviewed-by: Lucas Stach --- drivers/pci/controller/dwc/pci-imx6.c | 62 ++++++++++++++++----------- 1 file changed, 37 insertions(+), 25 deletions(-) diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 21e9101f63f0..b7a7e3465f28 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: @@ -904,6 +897,14 @@ 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); @@ -923,11 +924,17 @@ static int imx6_pcie_host_init(struct pcie_port *pp) imx6_pcie_assert_core_reset(imx6_pcie); imx6_pcie_init_phy(imx6_pcie); + 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; } } @@ -941,24 +948,40 @@ static int imx6_pcie_host_init(struct pcie_port *pp) ret = phy_init(imx6_pcie->phy); if (ret) { dev_err(dev, "waiting for phy ready timeout!\n"); - goto err_clk_disable; + goto err_phy_off; } } imx6_setup_phy_mpll(imx6_pcie); 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, }; @@ -1008,25 +1031,14 @@ 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; }