From patchwork Wed Jan 5 15:02:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Pali_Roh=C3=A1r?= X-Patchwork-Id: 12704471 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 2380DC4332F for ; Wed, 5 Jan 2022 15:03:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241241AbiAEPDG (ORCPT ); Wed, 5 Jan 2022 10:03:06 -0500 Received: from ams.source.kernel.org ([145.40.68.75]:55242 "EHLO ams.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241200AbiAEPC6 (ORCPT ); Wed, 5 Jan 2022 10:02:58 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id D074AB81BAA; Wed, 5 Jan 2022 15:02:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 628E4C36AE3; Wed, 5 Jan 2022 15:02:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1641394975; bh=a6auHCW+ic8+PezBDokk6QACr1ciBtOMQMlDuFxtZwg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uORkDIOC/C0YKuZY3x//JxXXm4OQkvs9hlJo3LKcYXyOpRkfMkLl8GL0erYBPBQWB nA6sCxS9EbvNhtMY9smoTKJrUUfOvqBCSuJ2d9LODvL17RsYPweId593ynHzypNkfE SjWn9H8Oki6w11bDBicXtiydFXc9rllU2eOlwU7yrLn67Zc/EOFEo9m9+b6jWcUygV MBXzWgZYqhPzme0yTsHQ2l9TRQuL4J5XQwyOskNmLrhIT6AYm+ILC7mqrZd4aa7/71 ul/KdOyV5ou04I3xLXc3bzBzpO9IZgkSZB34VGvn3HVhi6yinC9U9X+y6io34IKPfX FitYLE7FUB11A== Received: by pali.im (Postfix) id 1BEF682A; Wed, 5 Jan 2022 16:02:55 +0100 (CET) From: =?utf-8?q?Pali_Roh=C3=A1r?= To: Lorenzo Pieralisi , Bjorn Helgaas , Rob Herring , Thomas Petazzoni , =?utf-8?q?Krzysztof_Wilczy?= =?utf-8?q?=C5=84ski?= , =?utf-8?q?Marek_Beh=C3=BAn?= , Russell King Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 05/11] PCI: mvebu: Correctly configure x1/x4 mode Date: Wed, 5 Jan 2022 16:02:33 +0100 Message-Id: <20220105150239.9628-6-pali@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220105150239.9628-1-pali@kernel.org> References: <20220105150239.9628-1-pali@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org If x1/x4 mode is not set correctly then link with endpoint card is not established. Use DTS property 'num-lanes' to deteriminate x1/x4 mode. Signed-off-by: Pali Rohár --- drivers/pci/controller/pci-mvebu.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c index a075ba26cff1..0f2ec0a17874 100644 --- a/drivers/pci/controller/pci-mvebu.c +++ b/drivers/pci/controller/pci-mvebu.c @@ -93,6 +93,7 @@ struct mvebu_pcie_port { void __iomem *base; u32 port; u32 lane; + bool is_x4; int devfn; unsigned int mem_target; unsigned int mem_attr; @@ -233,13 +234,25 @@ static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port) static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port) { - u32 ctrl, cmd, dev_rev, mask; + u32 ctrl, lnkcap, cmd, dev_rev, mask; /* Setup PCIe controller to Root Complex mode. */ ctrl = mvebu_readl(port, PCIE_CTRL_OFF); ctrl |= PCIE_CTRL_RC_MODE; mvebu_writel(port, ctrl, PCIE_CTRL_OFF); + /* + * Set Maximum Link Width to X1 or X4 in Root Port's PCIe Link + * Capability register. This register is defined by PCIe specification + * as read-only but this mvebu controller has it as read-write and must + * be set to number of SerDes PCIe lanes (1 or 4). If this register is + * not set correctly then link with endpoint card is not established. + */ + lnkcap = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCAP); + lnkcap &= ~PCI_EXP_LNKCAP_MLW; + lnkcap |= (port->is_x4 ? 4 : 1) << 4; + mvebu_writel(port, lnkcap, PCIE_CAP_PCIEXP + PCI_EXP_LNKCAP); + /* Disable Root Bridge I/O space, memory space and bus mastering. */ cmd = mvebu_readl(port, PCIE_CMD_OFF); cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); @@ -986,6 +999,7 @@ static int mvebu_pcie_parse_port(struct mvebu_pcie *pcie, struct device *dev = &pcie->pdev->dev; enum of_gpio_flags flags; int reset_gpio, ret; + u32 num_lanes; port->pcie = pcie; @@ -998,6 +1012,9 @@ static int mvebu_pcie_parse_port(struct mvebu_pcie *pcie, if (of_property_read_u32(child, "marvell,pcie-lane", &port->lane)) port->lane = 0; + if (!of_property_read_u32(child, "num-lanes", &num_lanes) && num_lanes == 4) + port->is_x4 = true; + port->name = devm_kasprintf(dev, GFP_KERNEL, "pcie%d.%d", port->port, port->lane); if (!port->name) {