From patchwork Fri Feb 25 03:44:26 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hongxing Zhu X-Patchwork-Id: 12759628 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com 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 3ADDAC433EF for ; Fri, 25 Feb 2022 03:53:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237224AbiBYDxh (ORCPT ); Thu, 24 Feb 2022 22:53:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40262 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237138AbiBYDxf (ORCPT ); Thu, 24 Feb 2022 22:53:35 -0500 Received: from inva021.nxp.com (inva021.nxp.com [92.121.34.21]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7A65E1A58F4; Thu, 24 Feb 2022 19:53:03 -0800 (PST) Received: from inva021.nxp.com (localhost [127.0.0.1]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 07C7F201161; Fri, 25 Feb 2022 04:53:02 +0100 (CET) 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 C481E2011FC; Fri, 25 Feb 2022 04:53:01 +0100 (CET) Received: from localhost.localdomain (shlinux2.ap.freescale.net [10.192.224.44]) by aprdc01srsp001v.ap-rdc01.nxp.com (Postfix) with ESMTP id 2E6B8183AC97; Fri, 25 Feb 2022 11:53:00 +0800 (+08) From: Richard Zhu To: l.stach@pengutronix.de, bhelgaas@google.com, broonie@kernel.org, lorenzo.pieralisi@arm.com, jingoohan1@gmail.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 v8 7/8] PCI: imx6: Disable clocks and regulators after link is down Date: Fri, 25 Feb 2022 11:44:26 +0800 Message-Id: <1645760667-10510-8-git-send-email-hongxing.zhu@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1645760667-10510-1-git-send-email-hongxing.zhu@nxp.com> References: <1645760667-10510-1-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 Since i.MX PCIe doesn't support hot-plug, reduce power consumption as much as possible by disabling clocks and regulators and returning error when the link is down. Add a new host_exit() callback for i.MX PCIe driver to disable the clocks, regulators and so on in the error handling after host_init is finished. Signed-off-by: Richard Zhu --- drivers/pci/controller/dwc/pci-imx6.c | 34 +++++++++++++++++++++++---- 1 file changed, 29 insertions(+), 5 deletions(-) diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 160a0bd02098..f8b15f0bc9ce 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -849,7 +849,9 @@ static int imx6_pcie_start_link(struct dw_pcie *pci) /* Start LTSSM. */ imx6_pcie_ltssm_enable(dev); - dw_pcie_wait_for_link(pci); + ret = dw_pcie_wait_for_link(pci); + if (ret) + goto err_out; if (pci->link_gen == 2) { /* Allow Gen2 mode after the link is up. */ @@ -880,12 +882,14 @@ static int imx6_pcie_start_link(struct dw_pcie *pci) ret = imx6_pcie_wait_for_speed_change(imx6_pcie); if (ret) { dev_err(dev, "Failed to bring link up!\n"); - goto err_reset_phy; + goto err_out; } } /* Make sure link training is finished as well! */ - dw_pcie_wait_for_link(pci); + ret = dw_pcie_wait_for_link(pci); + if (ret) + goto err_out; } else { dev_info(dev, "Link: Gen2 disabled\n"); } @@ -894,11 +898,10 @@ static int imx6_pcie_start_link(struct dw_pcie *pci) dev_info(dev, "Link up, Gen%i\n", tmp & PCI_EXP_LNKSTA_CLS); return 0; -err_reset_phy: +err_out: dev_dbg(dev, "PHY DEBUG_R0=0x%08x DEBUG_R1=0x%08x\n", dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG0), dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG1)); - imx6_pcie_reset_phy(imx6_pcie); return ret; } @@ -922,8 +925,29 @@ static int imx6_pcie_host_init(struct pcie_port *pp) return 0; } +static void imx6_pcie_host_exit(struct pcie_port *pp) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct device *dev = pci->dev; + struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci); + + imx6_pcie_reset_phy(imx6_pcie); + 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"); + break; + default: + break; + } + 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, + .host_exit = imx6_pcie_host_exit, }; static const struct dw_pcie_ops dw_pcie_ops = {