From patchwork Tue Nov 26 07:39:09 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Zhu X-Patchwork-Id: 13885529 Received: from EUR05-AM6-obe.outbound.protection.outlook.com (mail-am6eur05on2047.outbound.protection.outlook.com [40.107.22.47]) (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 329D9194137; Tue, 26 Nov 2024 07:40:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.22.47 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732606805; cv=fail; b=RcbjMzNh641R1tTQq9RKKHe3DrmIrI6ZMJeGdPXhjb1yPClKstsCh4+07ugmmGd6i7RjRHR940kATVMAaptSDGV5KBDuympBIshawk9GQtjCOlGs8m0wGIcT8zpmt/Zu5rCfItlakoY+1oIcqexgU1EBX/kBmPSIcXxc3AAYwCI= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732606805; c=relaxed/simple; bh=oyX9g52A+PIwKlVInKhyePqOC+LgAltjHOhK3oTFgio=; h=From:To:Cc:Subject:Date:Message-Id:Content-Type:MIME-Version; b=jDb27g1VXJjEsGuCF3lWAB/2ym1aT1tL9xHaDAhfWrfaTJgjDxJGL90c4R+GazHF7dQV0mLDTXtQn35KnLztfOr//ZcLRSClD0bS/hlPorqI+6Xa+E9Gx+2qhiBfCOr06sXfkUqFdBJNMZpYd9fyK1vmYvuyDj5IGTbxvX2ALe8= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=nxp.com; spf=pass smtp.mailfrom=nxp.com; dkim=pass (2048-bit key) header.d=nxp.com header.i=@nxp.com header.b=PwHkt2df; arc=fail smtp.client-ip=40.107.22.47 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=nxp.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=nxp.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=nxp.com header.i=@nxp.com header.b="PwHkt2df" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=x0PW+jRznfoUYEtv3+pJVb4jWb28Sebriv93sU3LkLdF0JAba34FRbdT/2DEojcGmNr8gkJJD9XZCjjY1ISVYnrgLZpunleRMXozobLQzmDTTJ0A0eApVMgirccmLgWqD/epQMZ/OptHdvSwOHTGSRO84cmRXt1tYEgbnY/mzxmbkEqXTSIEZ11WKkoFN4ZS4Vjjt0S8/EB9zf+xrH4lKsmTIt+C8zVEVRnofl12J/R4b5GRyR413MRE6jZdhOmkRICCiS7/1G4SvwZuj6JBk8X27n8NXX3tfQn6A/xwI6AdRa9JuRZyPntu8CizkBsjM9llP2IoMyVK6sqDMpy8cA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=CRVG4UEGZf9hhMXWbDT7zUWr4NVjpS7IqJnUBICDnSk=; b=aFkVP0q4z4M+ZGAGTnbwXFHuRepyn3TJNzXIK5qxiWC/Eg8aYM/X4qxKzPOriyYTFAsDQbJACCMvAiwSaaiKHJkTdSrr1nh0eXKerkP1DbNjR7rtVNF8uDdmKlOsiM9bqAcY/9n3wP8figV2CzUxZguc9NfnRy9DSyijne5sgZmuoWsdipPxlFFQ2QN97Lof0hmN9jiekYwUEs7mWMv3dBUTm+zCcFW2BhIo4K49yEDQM+Gqgn7PHAtTKj04+Fea6AhKLvs2o0KTnFFdJAZqKzXx6FSSLs8XlproNDSOMSpHirPy4P7g1csgCLbWHlkTgd9AiMKxc4gxBQDtXufB0g== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nxp.com; dmarc=pass action=none header.from=nxp.com; dkim=pass header.d=nxp.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nxp.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=CRVG4UEGZf9hhMXWbDT7zUWr4NVjpS7IqJnUBICDnSk=; b=PwHkt2dfgvC6SIb0rUgz++iSjd4WEbpok1NyIcYUs38ojHGunS46Brek1+IToz/ZkBnyQiUn6T/qdRphJkNYmzP+OGsLkLu3MvchEFv/S2LSRxaabK3Q8w8STQ5Vpo/e2sDU3MUyKiS3o9uXWEDE2HN53n4H6VLuetQIlvl6QBzTc+IOPoOOi5S0CdP/huOK4U9ROeKnh05cNUBFt0O5nIoF0cRVP9wljJj8MM1QDGAxhHkkDloladgsiVqN34nRLkMdqjVORjxBrS44QjJLze7YWR3ytxHhXoNLYGYWszAPHKfedriRanD330D5DJiSmik+wnuFkcbnKYYIrelVJA== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nxp.com; Received: from AS8PR04MB8676.eurprd04.prod.outlook.com (2603:10a6:20b:42b::10) by PAWPR04MB9813.eurprd04.prod.outlook.com (2603:10a6:102:391::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8182.20; Tue, 26 Nov 2024 07:39:59 +0000 Received: from AS8PR04MB8676.eurprd04.prod.outlook.com ([fe80::28b2:de72:ad25:5d93]) by AS8PR04MB8676.eurprd04.prod.outlook.com ([fe80::28b2:de72:ad25:5d93%4]) with mapi id 15.20.8182.019; Tue, 26 Nov 2024 07:39:59 +0000 From: Richard Zhu To: jingoohan1@gmail.com, bhelgaas@google.com, lpieralisi@kernel.org, kw@linux.com, manivannan.sadhasivam@linaro.org, robh@kernel.org, frank.li@nxp.com, quic_krichai@quicinc.com Cc: imx@lists.linux.dev, kernel@pengutronix.de, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Richard Zhu Subject: [PATCH v5] PCI: dwc: Clean up some unnecessary codes in dw_pcie_suspend_noirq() Date: Tue, 26 Nov 2024 15:39:09 +0800 Message-Id: <20241126073909.4058733-1-hongxing.zhu@nxp.com> X-Mailer: git-send-email 2.37.1 X-ClientProxiedBy: SG2PR04CA0156.apcprd04.prod.outlook.com (2603:1096:4::18) To AS8PR04MB8676.eurprd04.prod.outlook.com (2603:10a6:20b:42b::10) Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AS8PR04MB8676:EE_|PAWPR04MB9813:EE_ X-MS-Office365-Filtering-Correlation-Id: 8749f148-fcf2-4c45-b595-08dd0ded876d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|52116014|7416014|376014|1800799024|366016|38350700014; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:AS8PR04MB8676.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(52116014)(7416014)(376014)(1800799024)(366016)(38350700014);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8749f148-fcf2-4c45-b595-08dd0ded876d X-MS-Exchange-CrossTenant-AuthSource: AS8PR04MB8676.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Nov 2024 07:39:59.0081 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: geYO6BD22CSFCQqDKrf0vQGFqhRpnEX9YO/k7/T3RhVq82UkehnQWGV6RBfeuAFJptxOv9gPAlb8MvdWq1XyoQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAWPR04MB9813 Before sending PME_TURN_OFF, don't test the LTSSM state. Since it's safe to send PME_TURN_OFF message regardless of whether the link is up or down. So, there would be no need to test the LTSSM state before sending PME_TURN_OFF message. Only print the message when ltssm_stat is not in DETECT and POLL. In the other words, there isn't an error message when no endpoint is connected at all. Signed-off-by: Richard Zhu --- v5 changes: - Remove the redundant check "(val > DW_PCIE_LTSSM_DETECT_WAIT)". v4 changes: - Keep error return when L2 entry is failed and the endpoint is connected refer to Krishna' comments. Thanks. v3 changes: - Refine the commit message refer to Manivannan's comments. - Regarding Frank's comments, avoid 10ms wait when no link up. v2 changes: - Don't remove L2 poll check. - Add one 1us delay after L2 entry. - No error return when L2 entry is timeout - Don't print message when no link up. --- .../pci/controller/dwc/pcie-designware-host.c | 38 +++++++++++-------- drivers/pci/controller/dwc/pcie-designware.h | 1 + 2 files changed, 23 insertions(+), 16 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index 24e89b66b772..bbd0ee862c12 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -927,25 +927,31 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci) if (dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKCTL) & PCI_EXP_LNKCTL_ASPM_L1) return 0; - /* Only send out PME_TURN_OFF when PCIE link is up */ - if (dw_pcie_get_ltssm(pci) > DW_PCIE_LTSSM_DETECT_ACT) { - if (pci->pp.ops->pme_turn_off) - pci->pp.ops->pme_turn_off(&pci->pp); - else - ret = dw_pcie_pme_turn_off(pci); - - if (ret) - return ret; + if (pci->pp.ops->pme_turn_off) + pci->pp.ops->pme_turn_off(&pci->pp); + else + ret = dw_pcie_pme_turn_off(pci); + if (ret) + return ret; - ret = read_poll_timeout(dw_pcie_get_ltssm, val, val == DW_PCIE_LTSSM_L2_IDLE, - PCIE_PME_TO_L2_TIMEOUT_US/10, - PCIE_PME_TO_L2_TIMEOUT_US, false, pci); - if (ret) { - dev_err(pci->dev, "Timeout waiting for L2 entry! LTSSM: 0x%x\n", val); - return ret; - } + ret = read_poll_timeout(dw_pcie_get_ltssm, val, + val == DW_PCIE_LTSSM_L2_IDLE || + val <= DW_PCIE_LTSSM_DETECT_WAIT, + PCIE_PME_TO_L2_TIMEOUT_US/10, + PCIE_PME_TO_L2_TIMEOUT_US, false, pci); + if (ret) { + /* Only dump message when ltssm_stat isn't in DETECT and POLL */ + dev_err(pci->dev, "Timeout waiting for L2 entry! LTSSM: 0x%x\n", val); + return ret; } + /* + * Refer to r6.0, sec 5.3.3.2.1, software should wait at least + * 100ns after L2/L3 Ready before turning off refclock and + * main power. It's harmless too when no endpoint connected. + */ + udelay(1); + dw_pcie_stop_link(pci); if (pci->pp.ops->deinit) pci->pp.ops->deinit(&pci->pp); diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index 347ab74ac35a..bf036e66717e 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -330,6 +330,7 @@ enum dw_pcie_ltssm { /* Need to align with PCIE_PORT_DEBUG0 bits 0:5 */ DW_PCIE_LTSSM_DETECT_QUIET = 0x0, DW_PCIE_LTSSM_DETECT_ACT = 0x1, + DW_PCIE_LTSSM_DETECT_WAIT = 0x6, DW_PCIE_LTSSM_L0 = 0x11, DW_PCIE_LTSSM_L2_IDLE = 0x15,