From patchwork Wed Jun 19 10:15:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Thomas Richard X-Patchwork-Id: 13703633 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 98CF3C27C53 for ; Wed, 19 Jun 2024 10:17:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=M72jZYyV65DqxQX89BNQFEE+r0wyDWzohfJY2wWVXuo=; b=s0qpYw1dMZN1sz1+amrWhxkZzZ pOr9kHoQ3Ut7SgxGNaHh542C60kRsFy2tFZ3oEAjDqxuu1uUqnDZenFivAYqkVChab6Pnq2pp8pyo oPJhjhjZkp3VI9pqEN9ZNSuexEvS/CVQWuSuzqb2cjcrm9kMme10D36groWO3AB+uQgFssI+CHDTO MHT/tYzgGa6mksVpA5LMneDHJNOiD0GFcfoj1ZKoXQDXR8siLkSHuIKF+mjCnpFV78mhptyNVwM8i KZTyDJPFhhEOL/cG0fu8O9XeM8y7pXqdjzOlOJAfjmFH3Mj1afWlB8D3RFpen55NGoeMAvvfRugB7 kugCNRPQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sJsN8-00000000lSD-3rbM; Wed, 19 Jun 2024 10:16:58 +0000 Received: from relay4-d.mail.gandi.net ([217.70.183.196]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sJsLk-00000000kes-1wXY for linux-arm-kernel@lists.infradead.org; Wed, 19 Jun 2024 10:15:37 +0000 Received: by mail.gandi.net (Postfix) with ESMTPSA id 00408E0002; Wed, 19 Jun 2024 10:15:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1718792130; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=M72jZYyV65DqxQX89BNQFEE+r0wyDWzohfJY2wWVXuo=; b=OIx7SEMxKCHAkmzw1EABsspp6JWEbcRaiTqIri2fmYOm05adSXSwyAGoa/bml9ywzsN97p 1Mg9e346QVix8QMXQZnA47xzZUm6gyH7t5AivROVoHex09xnhQzX3RstV4G/934nIQaJ23 lBftlAX9KmWbat28HKz8staJSiDtmRjgln44ki/V2RD7OGgvO2GNB1g8IhWV12JKGz0o24 BZx75W0yRNfjwD4M/cNO5rfLId2Jbm5Y4xleG1gfQGNHdaq9StDlFa3aZoclOZg8M1x7Mq NIDateKqsd9DaFJG5UkxI31zhUrYBJp4QfYeCpOqvAmEtIjq4DzE+btYr+GADg== From: Thomas Richard Date: Wed, 19 Jun 2024 12:15:15 +0200 Subject: [PATCH v7 7/7] PCI: j721e: Add suspend and resume support MIME-Version: 1.0 Message-Id: <20240102-j7200-pcie-s2r-v7-7-a2f9156da6c3@bootlin.com> References: <20240102-j7200-pcie-s2r-v7-0-a2f9156da6c3@bootlin.com> In-Reply-To: <20240102-j7200-pcie-s2r-v7-0-a2f9156da6c3@bootlin.com> To: Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy?= =?utf-8?q?=C5=84ski?= , Rob Herring , Bjorn Helgaas , Vignesh Raghavendra , Siddharth Vadapalli Cc: gregory.clement@bootlin.com, theo.lebrun@bootlin.com, thomas.petazzoni@bootlin.com, u-kumar1@ti.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Thomas Richard X-Mailer: b4 0.12.0 X-GND-Sasl: thomas.richard@bootlin.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240619_031534_565381_9B7C207A X-CRM114-Status: GOOD ( 19.98 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Théo Lebrun Add suspend and resume support. Only the rc mode is supported. During the suspend stage PERST# is asserted, then deasserted during the resume stage. Signed-off-by: Théo Lebrun Reviewed-by: Siddharth Vadapalli Signed-off-by: Thomas Richard --- drivers/pci/controller/cadence/pci-j721e.c | 98 ++++++++++++++++++++++++++++-- 1 file changed, 92 insertions(+), 6 deletions(-) diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c index 967a5bf38e26..96316a79ab8a 100644 --- a/drivers/pci/controller/cadence/pci-j721e.c +++ b/drivers/pci/controller/cadence/pci-j721e.c @@ -7,6 +7,8 @@ */ #include +#include +#include #include #include #include @@ -22,6 +24,8 @@ #include "../../pci.h" #include "pcie-cadence.h" +#define cdns_pcie_to_rc(p) container_of(p, struct cdns_pcie_rc, pcie) + #define ENABLE_REG_SYS_2 0x108 #define STATUS_REG_SYS_2 0x508 #define STATUS_CLR_REG_SYS_2 0x708 @@ -531,12 +535,12 @@ static int j721e_pcie_probe(struct platform_device *pdev) pcie->refclk = clk; /* - * "Power Sequencing and Reset Signal Timings" table in - * PCI EXPRESS CARD ELECTROMECHANICAL SPECIFICATION, REV. 3.0 - * indicates PERST# should be deasserted after minimum of 100us - * once REFCLK is stable. The REFCLK to the connector in RC - * mode is selected while enabling the PHY. So deassert PERST# - * after 100 us. + * "Power Sequencing and Reset Signal Timings" table (section + * 2.9.2) in PCI EXPRESS CARD ELECTROMECHANICAL SPECIFICATION, + * REV. 5.1 indicates PERST# should be deasserted after minimum + * of 100us once REFCLK is stable (symbol T_PERST-CLK). + * The REFCLK to the connector in RC mode is selected while + * enabling the PHY. So deassert PERST# after 100 us. */ if (gpiod) { fsleep(PCIE_T_PERST_CLK_US); @@ -588,6 +592,87 @@ static void j721e_pcie_remove(struct platform_device *pdev) pm_runtime_disable(dev); } +static int j721e_pcie_suspend_noirq(struct device *dev) +{ + struct j721e_pcie *pcie = dev_get_drvdata(dev); + + if (pcie->mode == PCI_MODE_RC) { + gpiod_set_value_cansleep(pcie->reset_gpio, 0); + clk_disable_unprepare(pcie->refclk); + } + + cdns_pcie_disable_phy(pcie->cdns_pcie); + + return 0; +} + +static int j721e_pcie_resume_noirq(struct device *dev) +{ + struct j721e_pcie *pcie = dev_get_drvdata(dev); + struct cdns_pcie *cdns_pcie = pcie->cdns_pcie; + int ret; + + ret = j721e_pcie_ctrl_init(pcie); + if (ret < 0) + return ret; + + j721e_pcie_config_link_irq(pcie); + + /* + * This is not called explicitly in the probe, it is called by + * cdns_pcie_init_phy(). + */ + ret = cdns_pcie_enable_phy(pcie->cdns_pcie); + if (ret < 0) + return ret; + + if (pcie->mode == PCI_MODE_RC) { + struct cdns_pcie_rc *rc = cdns_pcie_to_rc(cdns_pcie); + + ret = clk_prepare_enable(pcie->refclk); + if (ret < 0) + return ret; + + /* + * "Power Sequencing and Reset Signal Timings" table (section + * 2.9.2) in PCI EXPRESS CARD ELECTROMECHANICAL SPECIFICATION, + * REV. 5.1 indicates PERST# should be deasserted after minimum + * of 100us once REFCLK is stable (symbol T_PERST-CLK). + * The REFCLK to the connector in RC mode is selected while + * enabling the PHY. So deassert PERST# after 100 us. + */ + if (pcie->reset_gpio) { + fsleep(PCIE_T_PERST_CLK_US); + gpiod_set_value_cansleep(pcie->reset_gpio, 1); + } + + ret = cdns_pcie_host_link_setup(rc); + if (ret < 0) { + clk_disable_unprepare(pcie->refclk); + return ret; + } + + /* + * Reset internal status of BARs to force reinitialization in + * cdns_pcie_host_init(). + */ + for (enum cdns_pcie_rp_bar bar = RP_BAR0; bar <= RP_NO_BAR; bar++) + rc->avail_ib_bar[bar] = true; + + ret = cdns_pcie_host_init(rc); + if (ret) { + clk_disable_unprepare(pcie->refclk); + return ret; + } + } + + return 0; +} + +static DEFINE_NOIRQ_DEV_PM_OPS(j721e_pcie_pm_ops, + j721e_pcie_suspend_noirq, + j721e_pcie_resume_noirq); + static struct platform_driver j721e_pcie_driver = { .probe = j721e_pcie_probe, .remove_new = j721e_pcie_remove, @@ -595,6 +680,7 @@ static struct platform_driver j721e_pcie_driver = { .name = "j721e-pcie", .of_match_table = of_j721e_pcie_match, .suppress_bind_attrs = true, + .pm = pm_sleep_ptr(&j721e_pcie_pm_ops), }, }; builtin_platform_driver(j721e_pcie_driver);