From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lelv0143.ext.ti.com (lelv0143.ext.ti.com [198.47.23.248]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5CDAD1170A; Wed, 13 Mar 2024 06:51:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.47.23.248 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710312706; cv=none; b=XiBoEZkzhHmP9yCm5qE80QHcQf5Hp54Ur0FRnzs/k6Q5yB2j4sLae2oOr3LKIW7uVu+nXISyKzFF4ZIJjJcjjfCuLXWmMLKr16HSBCVopN3YAjgo/2x2b5qXf3xH0LekrZ0y9lQTM0xC3FTD0FXspN3AMefftfCZGJdRJPCs58g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710312706; c=relaxed/simple; bh=qV+who9BCOcvHst6HiD77hsq69Fk4GtrUpMmKKkjj00=; h=Date:From:To:CC:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=pYqRJ9HnYEnCjXGBFwVNfxO5zOrBvF/PLQ3MQ2ZuMhL1SAhZYH/kVe0W4ND3Am3r7yMV3FJeeNgF7YxiwkDZATaDHISCGTzNsoeeUHwEleVAMHig/Nt7404fuZrWYVWE6pyoRESLwHhutLvEA543z40RHHP21N41zJHG6dddDDY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=ti.com; spf=pass smtp.mailfrom=ti.com; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b=km6Clk7q; arc=none smtp.client-ip=198.47.23.248 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=ti.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ti.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="km6Clk7q" Received: from fllv0034.itg.ti.com ([10.64.40.246]) by lelv0143.ext.ti.com (8.15.2/8.15.2) with ESMTP id 42D6pBSN009136; Wed, 13 Mar 2024 01:51:11 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1710312671; bh=rzD+EzX/k7d5q06olV4JiQMj7NEc0ZLvW6rR4gLdO+Q=; h=Date:From:To:CC:Subject:References:In-Reply-To; b=km6Clk7qp/+sN3+TgPu6pY/9+6Y4NqK55vGuGGeuzCQE07yYflykG9/SNVsFWTjyK DHzTupyUxpiXmEFCei2+2g7Sg9HNbR+VcOrIuHFluhVAXESUuymUmH541bvrq171xZ ZmcuNa5Rvcr0NnqaOTr/IWF6QnHGy9odQ3zclXBQ= Received: from DFLE106.ent.ti.com (dfle106.ent.ti.com [10.64.6.27]) by fllv0034.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 42D6pBXi064923 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 13 Mar 2024 01:51:11 -0500 Received: from DFLE106.ent.ti.com (10.64.6.27) by DFLE106.ent.ti.com (10.64.6.27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23; Wed, 13 Mar 2024 01:51:10 -0500 Received: from lelvsmtp5.itg.ti.com (10.180.75.250) by DFLE106.ent.ti.com (10.64.6.27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23 via Frontend Transport; Wed, 13 Mar 2024 01:51:10 -0500 Received: from localhost (uda0492258.dhcp.ti.com [172.24.227.9]) by lelvsmtp5.itg.ti.com (8.15.2/8.15.2) with ESMTP id 42D6pAAW097772; Wed, 13 Mar 2024 01:51:10 -0500 Date: Wed, 13 Mar 2024 12:21:09 +0530 From: Siddharth Vadapalli To: Thomas Richard CC: Linus Walleij , Bartosz Golaszewski , Andy Shevchenko , Tony Lindgren , Haojian Zhuang , Vignesh R , Aaro Koskinen , Janusz Krzysztofik , Andi Shyti , Peter Rosin , Vinod Koul , Kishon Vijay Abraham I , Philipp Zabel , Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Rob Herring , Bjorn Helgaas , , , , , , , , , , , , Subject: Re: [PATCH v4 18/18] PCI: j721e: Add suspend and resume support Message-ID: References: <20240102-j7200-pcie-s2r-v4-0-6f1f53390c85@bootlin.com> <20240102-j7200-pcie-s2r-v4-18-6f1f53390c85@bootlin.com> Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20240102-j7200-pcie-s2r-v4-18-6f1f53390c85@bootlin.com> X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 On Mon, Mar 04, 2024 at 04:36:01PM +0100, Thomas Richard wrote: > 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 > Signed-off-by: Thomas Richard Reviewed-by: Siddharth Vadapalli Regards, Siddharth. > --- > drivers/pci/controller/cadence/pci-j721e.c | 86 ++++++++++++++++++++++++++++++ > 1 file changed, 86 insertions(+) > > diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c > index 9af4fd64c1f9..a1f1232e8ee5 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 > @@ -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 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. > + */ > + if (pcie->reset_gpio) { > + fsleep(100); > + 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); > > -- > 2.39.2 > > From mboxrd@z Thu Jan 1 00:00:00 1970 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 64563C54791 for ; Wed, 13 Mar 2024 06:51:41 +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:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:CC:To:From:Date:Reply-To:Content-ID:Content-Description: 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