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Mon, 18 Oct 2021 11:07:27 -0700 Received: from ipgpd01.cadence.com (localhost.localdomain [127.0.0.1]) by ipgpd01.cadence.com (8.14.4/8.14.4) with ESMTP id 19II7RlN089813; Mon, 18 Oct 2021 11:07:27 -0700 Received: (from pthombar@localhost) by ipgpd01.cadence.com (8.14.4/8.14.4/Submit) id 19II7Rfe089810; Mon, 18 Oct 2021 11:07:27 -0700 From: Parshuram Raju Thombare To: , , , , , CC: , , , , , Subject: [PATCH] PCI: cadence: Disable Function Level Reset support Date: Mon, 18 Oct 2021 11:07:25 -0700 Message-ID: <1634580445-89772-1-git-send-email-pthombar@cadence.com> X-Mailer: git-send-email 2.2.2 MIME-Version: 1.0 Content-Type: text/plain X-CrossPremisesHeadersFilteredBySendConnector: mailsj9.global.cadence.com X-OrganizationHeadersPreserved: mailsj9.global.cadence.com X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: c31d9df4-6c2c-4024-cfde-08d992622701 X-MS-TrafficTypeDiagnostic: DM5PR0701MB3752: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7219; 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X-OriginatorOrg: cadence.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Oct 2021 18:07:30.6957 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c31d9df4-6c2c-4024-cfde-08d992622701 X-MS-Exchange-CrossTenant-Id: d36035c5-6ce6-4662-a3dc-e762e61ae4c9 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=d36035c5-6ce6-4662-a3dc-e762e61ae4c9;Ip=[199.43.4.23];Helo=[rmmaillnx1.cadence.com] X-MS-Exchange-CrossTenant-AuthSource: MW2NAM12FT045.eop-nam12.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR0701MB3752 X-Proofpoint-ORIG-GUID: dzFvyqvcybN90gYauaPmLNk4fsA_a16p X-Proofpoint-GUID: dzFvyqvcybN90gYauaPmLNk4fsA_a16p X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.0.607.475 definitions=2021-10-18_07,2021-10-18_01,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_check_notspam policy=outbound_check score=0 mlxlogscore=977 suspectscore=0 mlxscore=0 spamscore=0 adultscore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 priorityscore=1501 clxscore=1011 phishscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2109230001 definitions=main-2110180102 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Parshuram Thombare This patch disables FLR (Function Level Reset) support on all physical functions. During FLR, the Margining Lane Status and Margining Lane Control registers should not be reset, as per PCIe specification. However, the Controller incorrectly resets these registers upon FLR. This causes PCISIG compliance FLR test to fail. Hence disabling FLR on all functions using quirk flag. Signed-off-by: Parshuram Thombare --- drivers/pci/controller/cadence/pci-j721e.c | 3 +++ drivers/pci/controller/cadence/pcie-cadence-ep.c | 18 +++++++++++++++++- drivers/pci/controller/cadence/pcie-cadence.h | 3 +++ 3 files changed, 23 insertions(+), 1 deletion(-) diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c index ffb176d..635e36c 100644 --- a/drivers/pci/controller/cadence/pci-j721e.c +++ b/drivers/pci/controller/cadence/pci-j721e.c @@ -70,6 +70,7 @@ struct j721e_pcie_data { enum j721e_pcie_mode mode; unsigned int quirk_retrain_flag:1; unsigned int quirk_detect_quiet_flag:1; + unsigned int quirk_disable_flr:1; u32 linkdown_irq_regfield; unsigned int byte_access_allowed:1; }; @@ -308,6 +309,7 @@ static int cdns_ti_pcie_config_write(struct pci_bus *bus, unsigned int devfn, static const struct j721e_pcie_data j7200_pcie_ep_data = { .mode = PCI_MODE_EP, .quirk_detect_quiet_flag = true, + .quirk_disable_flr = true, }; static const struct j721e_pcie_data am64_pcie_rc_data = { @@ -510,6 +512,7 @@ static int j721e_pcie_probe(struct platform_device *pdev) goto err_get_sync; } ep->quirk_detect_quiet_flag = data->quirk_detect_quiet_flag; + ep->quirk_disable_flr = data->quirk_disable_flr; cdns_pcie = &ep->pcie; cdns_pcie->dev = dev; diff --git a/drivers/pci/controller/cadence/pcie-cadence-ep.c b/drivers/pci/controller/cadence/pcie-cadence-ep.c index 88e05b9..4b1c4bc 100644 --- a/drivers/pci/controller/cadence/pcie-cadence-ep.c +++ b/drivers/pci/controller/cadence/pcie-cadence-ep.c @@ -565,7 +565,8 @@ static int cdns_pcie_ep_start(struct pci_epc *epc) struct cdns_pcie_ep *ep = epc_get_drvdata(epc); struct cdns_pcie *pcie = &ep->pcie; struct device *dev = pcie->dev; - int ret; + int max_epfs = sizeof(epc->function_num_map) * 8; + int ret, value, epf; /* * BIT(0) is hardwired to 1, hence function 0 is always enabled @@ -573,6 +574,21 @@ static int cdns_pcie_ep_start(struct pci_epc *epc) */ cdns_pcie_writel(pcie, CDNS_PCIE_LM_EP_FUNC_CFG, epc->function_num_map); + if (ep->quirk_disable_flr) { + for (epf = 0; epf < max_epfs; epf++) { + if (!(epc->function_num_map & BIT(epf))) + continue; + + value = cdns_pcie_ep_fn_readl(pcie, epf, + CDNS_PCIE_EP_FUNC_DEV_CAP_OFFSET + + PCI_EXP_DEVCAP); + value &= ~PCI_EXP_DEVCAP_FLR; + cdns_pcie_ep_fn_writel(pcie, epf, + CDNS_PCIE_EP_FUNC_DEV_CAP_OFFSET + + PCI_EXP_DEVCAP, value); + } + } + ret = cdns_pcie_start_link(pcie); if (ret) { dev_err(dev, "Failed to start link\n"); diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h index 262421e..e978e7c 100644 --- a/drivers/pci/controller/cadence/pcie-cadence.h +++ b/drivers/pci/controller/cadence/pcie-cadence.h @@ -123,6 +123,7 @@ #define CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET 0x90 #define CDNS_PCIE_EP_FUNC_MSIX_CAP_OFFSET 0xb0 +#define CDNS_PCIE_EP_FUNC_DEV_CAP_OFFSET 0xc0 #define CDNS_PCIE_EP_FUNC_SRIOV_CAP_OFFSET 0x200 /* @@ -357,6 +358,7 @@ struct cdns_pcie_epf { * minimize time between read and write * @epf: Structure to hold info about endpoint function * @quirk_detect_quiet_flag: LTSSM Detect Quiet min delay set as quirk + * @quirk_disable_flr: Disable FLR (Function Level Reset) quirk flag */ struct cdns_pcie_ep { struct cdns_pcie pcie; @@ -372,6 +374,7 @@ struct cdns_pcie_ep { spinlock_t lock; struct cdns_pcie_epf *epf; unsigned int quirk_detect_quiet_flag:1; + unsigned int quirk_disable_flr:1; }; -- 1.9.1 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4E38CC433EF for ; Mon, 18 Oct 2021 18:09:41 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 1EF1660F59 for ; Mon, 18 Oct 2021 18:09:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 1EF1660F59 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=cadence.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Parshuram Thombare This patch disables FLR (Function Level Reset) support on all physical functions. During FLR, the Margining Lane Status and Margining Lane Control registers should not be reset, as per PCIe specification. However, the Controller incorrectly resets these registers upon FLR. This causes PCISIG compliance FLR test to fail. Hence disabling FLR on all functions using quirk flag. Signed-off-by: Parshuram Thombare --- drivers/pci/controller/cadence/pci-j721e.c | 3 +++ drivers/pci/controller/cadence/pcie-cadence-ep.c | 18 +++++++++++++++++- drivers/pci/controller/cadence/pcie-cadence.h | 3 +++ 3 files changed, 23 insertions(+), 1 deletion(-) diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c index ffb176d..635e36c 100644 --- a/drivers/pci/controller/cadence/pci-j721e.c +++ b/drivers/pci/controller/cadence/pci-j721e.c @@ -70,6 +70,7 @@ struct j721e_pcie_data { enum j721e_pcie_mode mode; unsigned int quirk_retrain_flag:1; unsigned int quirk_detect_quiet_flag:1; + unsigned int quirk_disable_flr:1; u32 linkdown_irq_regfield; unsigned int byte_access_allowed:1; }; @@ -308,6 +309,7 @@ static int cdns_ti_pcie_config_write(struct pci_bus *bus, unsigned int devfn, static const struct j721e_pcie_data j7200_pcie_ep_data = { .mode = PCI_MODE_EP, .quirk_detect_quiet_flag = true, + .quirk_disable_flr = true, }; static const struct j721e_pcie_data am64_pcie_rc_data = { @@ -510,6 +512,7 @@ static int j721e_pcie_probe(struct platform_device *pdev) goto err_get_sync; } ep->quirk_detect_quiet_flag = data->quirk_detect_quiet_flag; + ep->quirk_disable_flr = data->quirk_disable_flr; cdns_pcie = &ep->pcie; cdns_pcie->dev = dev; diff --git a/drivers/pci/controller/cadence/pcie-cadence-ep.c b/drivers/pci/controller/cadence/pcie-cadence-ep.c index 88e05b9..4b1c4bc 100644 --- a/drivers/pci/controller/cadence/pcie-cadence-ep.c +++ b/drivers/pci/controller/cadence/pcie-cadence-ep.c @@ -565,7 +565,8 @@ static int cdns_pcie_ep_start(struct pci_epc *epc) struct cdns_pcie_ep *ep = epc_get_drvdata(epc); struct cdns_pcie *pcie = &ep->pcie; struct device *dev = pcie->dev; - int ret; + int max_epfs = sizeof(epc->function_num_map) * 8; + int ret, value, epf; /* * BIT(0) is hardwired to 1, hence function 0 is always enabled @@ -573,6 +574,21 @@ static int cdns_pcie_ep_start(struct pci_epc *epc) */ cdns_pcie_writel(pcie, CDNS_PCIE_LM_EP_FUNC_CFG, epc->function_num_map); + if (ep->quirk_disable_flr) { + for (epf = 0; epf < max_epfs; epf++) { + if (!(epc->function_num_map & BIT(epf))) + continue; + + value = cdns_pcie_ep_fn_readl(pcie, epf, + CDNS_PCIE_EP_FUNC_DEV_CAP_OFFSET + + PCI_EXP_DEVCAP); + value &= ~PCI_EXP_DEVCAP_FLR; + cdns_pcie_ep_fn_writel(pcie, epf, + CDNS_PCIE_EP_FUNC_DEV_CAP_OFFSET + + PCI_EXP_DEVCAP, value); + } + } + ret = cdns_pcie_start_link(pcie); if (ret) { dev_err(dev, "Failed to start link\n"); diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h index 262421e..e978e7c 100644 --- a/drivers/pci/controller/cadence/pcie-cadence.h +++ b/drivers/pci/controller/cadence/pcie-cadence.h @@ -123,6 +123,7 @@ #define CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET 0x90 #define CDNS_PCIE_EP_FUNC_MSIX_CAP_OFFSET 0xb0 +#define CDNS_PCIE_EP_FUNC_DEV_CAP_OFFSET 0xc0 #define CDNS_PCIE_EP_FUNC_SRIOV_CAP_OFFSET 0x200 /* @@ -357,6 +358,7 @@ struct cdns_pcie_epf { * minimize time between read and write * @epf: Structure to hold info about endpoint function * @quirk_detect_quiet_flag: LTSSM Detect Quiet min delay set as quirk + * @quirk_disable_flr: Disable FLR (Function Level Reset) quirk flag */ struct cdns_pcie_ep { struct cdns_pcie pcie; @@ -372,6 +374,7 @@ struct cdns_pcie_ep { spinlock_t lock; struct cdns_pcie_epf *epf; unsigned int quirk_detect_quiet_flag:1; + unsigned int quirk_disable_flr:1; }; -- 1.9.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel