From patchwork Mon Oct 15 05:44:45 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Honghui Zhang X-Patchwork-Id: 10641149 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 03AD9112B for ; Mon, 15 Oct 2018 05:46:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E5BA8295F0 for ; Mon, 15 Oct 2018 05:46:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D81A0295F6; Mon, 15 Oct 2018 05:46:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE,UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 5BBE2295F0 for ; Mon, 15 Oct 2018 05:46:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=xoXl+zo/Fxqbyk6a9W94ghEsB41MC2IAqjp4nmDc1zI=; b=IQJFRbG+dcoF1T BneL8eX3Uxq7M1jPCISTHTqOxXkoBDogsW2ZYIT+FEPdazGtTmh3vEyC0HvoDk6jSIWqUa1glZg2K cTYDD9z8DB6VE1n8I7IiDK7JyU/CEZ+E1PzDx3sqs9/R/peFr+Pzsqc/n7XHTMaYIm8gQ3jcxcd7F eKed6FQX0B+i8gZGVUjeBB1GKd4r0Pej6DcrWGAbsF+xiDeZ7+VrbVNNC5A7FitihETWyjITgvOih Ju5CiOgUJBLIRZesyYxEKKsqJMLFMU9ABHj9FKMxUQqRP5Ug7xsVaQKMNtBRopvrGtFaoPAWYjwUW MEDDJgSD36Omu5f2h0zQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gBvhs-0003Ho-P1; Mon, 15 Oct 2018 05:46:20 +0000 Received: from [210.61.82.183] (helo=mailgw01.mediatek.com) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gBvgj-0001Zm-Rg; Mon, 15 Oct 2018 05:45:12 +0000 X-UUID: 7b48a999d39046b4939bdd77ec4cd215-20181015 X-UUID: 7b48a999d39046b4939bdd77ec4cd215-20181015 Received: from mtkmrs01.mediatek.inc [(172.21.131.159)] by mailgw01.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 1857975892; Mon, 15 Oct 2018 13:44:58 +0800 Received: from mtkcas08.mediatek.inc (172.21.101.126) by mtkmbs08n2.mediatek.inc (172.21.101.56) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Mon, 15 Oct 2018 13:44:56 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkcas08.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Mon, 15 Oct 2018 13:44:55 +0800 From: To: , , , , , , Subject: [PATCH v7 7/9] PCI: mediatek: Add system PM support for MT2712 and MT7622 Date: Mon, 15 Oct 2018 13:44:45 +0800 Message-ID: <1539582287-9171-8-git-send-email-honghui.zhang@mediatek.com> X-Mailer: git-send-email 2.6.4 In-Reply-To: <1539582287-9171-1-git-send-email-honghui.zhang@mediatek.com> References: <1539582287-9171-1-git-send-email-honghui.zhang@mediatek.com> MIME-Version: 1.0 X-TM-SNTS-SMTP: 57D238B6B36C32FBB21E2365C21D2A27CAE1B1B2E22E99DC9C9AAC3B6F46C66E2000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181014_224510_056156_218CA4B6 X-CRM114-Status: UNSURE ( 9.18 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: youlin.pei@mediatek.com, devicetree@vger.kernel.org, ulf.hansson@linaro.org, marc.zyngier@arm.com, jianjun.wang@mediatek.com, yt.shen@mediatek.com, honghui.zhang@mediatek.com, matthias.bgg@gmail.com, yingjoe.chen@mediatek.com, eddie.huang@mediatek.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Honghui Zhang In order to reduce the PCIe power consuming while system suspend, the physical layer should be gated. And the PCIe link should be re-established and the related control register values should be re-initialized after system resume. Register suspend_noirq & resume_noirq callback functions to allow PCIe to come up after resume from RAM. Signed-off-by: Honghui Zhang --- drivers/pci/controller/pcie-mediatek.c | 50 ++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c index d3f4694..42cf2a4 100644 --- a/drivers/pci/controller/pcie-mediatek.c +++ b/drivers/pci/controller/pcie-mediatek.c @@ -1168,6 +1168,55 @@ static int mtk_pcie_probe(struct platform_device *pdev) return err; } +static int __maybe_unused mtk_pcie_suspend_noirq(struct device *dev) +{ + struct mtk_pcie *pcie = dev_get_drvdata(dev); + struct mtk_pcie_port *port; + + if (list_empty(&pcie->ports)) + return 0; + + list_for_each_entry(port, &pcie->ports, list) { + clk_disable_unprepare(port->pipe_ck); + clk_disable_unprepare(port->obff_ck); + clk_disable_unprepare(port->axi_ck); + clk_disable_unprepare(port->aux_ck); + clk_disable_unprepare(port->ahb_ck); + clk_disable_unprepare(port->sys_ck); + phy_power_off(port->phy); + phy_exit(port->phy); + } + + clk_disable_unprepare(pcie->free_ck); + + return 0; +} + +static int __maybe_unused mtk_pcie_resume_noirq(struct device *dev) +{ + struct mtk_pcie *pcie = dev_get_drvdata(dev); + struct mtk_pcie_port *port, *tmp; + + if (list_empty(&pcie->ports)) + return 0; + + clk_prepare_enable(pcie->free_ck); + + list_for_each_entry_safe(port, tmp, &pcie->ports, list) + mtk_pcie_enable_port(port); + + /* In case of EP was removed while system suspend. */ + if (list_empty(&pcie->ports)) + clk_disable_unprepare(pcie->free_ck); + + return 0; +} + +static const struct dev_pm_ops mtk_pcie_pm_ops = { + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_pcie_suspend_noirq, + mtk_pcie_resume_noirq) +}; + static const struct mtk_pcie_soc mtk_pcie_soc_v1 = { .ops = &mtk_pcie_ops, .startup = mtk_pcie_startup_port, @@ -1200,6 +1249,7 @@ static struct platform_driver mtk_pcie_driver = { .name = "mtk-pcie", .of_match_table = mtk_pcie_ids, .suppress_bind_attrs = true, + .pm = &mtk_pcie_pm_ops, }, }; builtin_platform_driver(mtk_pcie_driver);