From patchwork Sat Aug 12 20:44:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Achal Verma X-Patchwork-Id: 13351949 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 31C9AC001B0 for ; Sat, 12 Aug 2023 20:45:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230477AbjHLUpP (ORCPT ); Sat, 12 Aug 2023 16:45:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48664 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230415AbjHLUpN (ORCPT ); Sat, 12 Aug 2023 16:45:13 -0400 Received: from lelv0142.ext.ti.com (lelv0142.ext.ti.com [198.47.23.249]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2B6AE10F2; Sat, 12 Aug 2023 13:45:16 -0700 (PDT) Received: from fllv0034.itg.ti.com ([10.64.40.246]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id 37CKiwGw095270; Sat, 12 Aug 2023 15:44:58 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1691873098; bh=KDMPwakXHnBm1lyuJMieItLxASOIXvE4C4DW6HKNztU=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=N2dGHaG0b7qGs71o83Dcd1oQhPZnCuFkpcq6a2wqH2mPQ92TZAUCqJeqBXJhyAQS+ n2IAGwjqFnvfzm6lqvcqj08fAUfu5pitI2o3zGBXhcUpkBP0NcXEmso2+M2AjQFO3P prCoYumRq3So1Af0lry08atYCRxIqQf/lZRAuSsg= Received: from DFLE113.ent.ti.com (dfle113.ent.ti.com [10.64.6.34]) by fllv0034.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 37CKiwbk127046 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Sat, 12 Aug 2023 15:44:58 -0500 Received: from DFLE108.ent.ti.com (10.64.6.29) by DFLE113.ent.ti.com (10.64.6.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23; Sat, 12 Aug 2023 15:44:58 -0500 Received: from fllv0040.itg.ti.com (10.64.41.20) by DFLE108.ent.ti.com (10.64.6.29) 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; Sat, 12 Aug 2023 15:44:58 -0500 Received: from localhost (ileaxei01-snat2.itg.ti.com [10.180.69.6]) by fllv0040.itg.ti.com (8.15.2/8.15.2) with ESMTP id 37CKivss067879; Sat, 12 Aug 2023 15:44:58 -0500 From: Achal Verma To: Vignesh Raghavendra , Lorenzo Pieralisi , Krzysztof Wilczy_ski , Rob Herring , Bjorn Helgaas CC: , , , , Achal Verma Subject: [PATCH 1/2] PCI: cadence: Advertise ARI Forwarding Supported Date: Sun, 13 Aug 2023 02:14:54 +0530 Message-ID: <20230812204455.479510-2-a-verma1@ti.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230812204455.479510-1-a-verma1@ti.com> References: <20230812204455.479510-1-a-verma1@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org J7 PCIe Root Complex has ARI Forwarding Support (advertised by PCI_EXP_DEVCAP2_ARI bit) which means support for forwarding of TLPs addressed to functions with function number greater than 7 but for some PCIe instances on J7, PCI_EXP_DEVCAP2_ARI bit is cleared which prevents accessing functions with function number > 7. Setting the PCI_EXP_DEVCAP2_ARI explicitly, resolves the issue. Signed-off-by: Achal Verma --- drivers/pci/controller/cadence/pci-j721e.c | 4 ++++ drivers/pci/controller/cadence/pcie-cadence-host.c | 7 +++++++ drivers/pci/controller/cadence/pcie-cadence.h | 12 ++++++++++++ 3 files changed, 23 insertions(+) diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c index 2c3b3af59271..7e94eb94f29c 100644 --- a/drivers/pci/controller/cadence/pci-j721e.c +++ b/drivers/pci/controller/cadence/pci-j721e.c @@ -73,6 +73,7 @@ struct j721e_pcie_data { unsigned int quirk_disable_flr:1; u32 linkdown_irq_regfield; unsigned int byte_access_allowed:1; + unsigned int set_afs_bit:1; }; static inline u32 j721e_pcie_user_readl(struct j721e_pcie *pcie, u32 offset) @@ -292,6 +293,7 @@ static const struct j721e_pcie_data j721e_pcie_rc_data = { .quirk_retrain_flag = true, .byte_access_allowed = false, .linkdown_irq_regfield = LINK_DOWN, + .set_afs_bit = true, }; static const struct j721e_pcie_data j721e_pcie_ep_data = { @@ -304,6 +306,7 @@ static const struct j721e_pcie_data j7200_pcie_rc_data = { .quirk_detect_quiet_flag = true, .linkdown_irq_regfield = J7200_LINK_DOWN, .byte_access_allowed = true, + .set_afs_bit = true, }; static const struct j721e_pcie_data j7200_pcie_ep_data = { @@ -393,6 +396,7 @@ static int j721e_pcie_probe(struct platform_device *pdev) rc = pci_host_bridge_priv(bridge); rc->quirk_retrain_flag = data->quirk_retrain_flag; rc->quirk_detect_quiet_flag = data->quirk_detect_quiet_flag; + rc->set_afs_bit = data->set_afs_bit; cdns_pcie = &rc->pcie; cdns_pcie->dev = dev; diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/pci/controller/cadence/pcie-cadence-host.c index 5b14f7ee3c79..fc696d94f7a2 100644 --- a/drivers/pci/controller/cadence/pcie-cadence-host.c +++ b/drivers/pci/controller/cadence/pcie-cadence-host.c @@ -507,6 +507,7 @@ int cdns_pcie_host_setup(struct cdns_pcie_rc *rc) struct cdns_pcie *pcie; struct resource *res; int ret; + u32 pcie_cap2; bridge = pci_host_bridge_from_priv(rc); if (!bridge) @@ -536,6 +537,12 @@ int cdns_pcie_host_setup(struct cdns_pcie_rc *rc) if (rc->quirk_detect_quiet_flag) cdns_pcie_detect_quiet_min_delay_set(&rc->pcie); + if (rc->set_afs_bit) { + pcie_cap2 = cdns_pcie_rp_readl(pcie, CDNS_PCIE_RP_CAP_OFFSET + PCI_EXP_DEVCAP2); + pcie_cap2 |= PCI_EXP_DEVCAP2_ARI; + cdns_pcie_rp_writel(pcie, CDNS_PCIE_RP_CAP_OFFSET + PCI_EXP_DEVCAP2, pcie_cap2); + } + cdns_pcie_host_enable_ptm_response(pcie); ret = cdns_pcie_start_link(pcie); diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h index 190786e47df9..7a5d05f3febc 100644 --- a/drivers/pci/controller/cadence/pcie-cadence.h +++ b/drivers/pci/controller/cadence/pcie-cadence.h @@ -329,6 +329,7 @@ struct cdns_pcie_rc { bool avail_ib_bar[CDNS_PCIE_RP_MAX_IB]; unsigned int quirk_retrain_flag:1; unsigned int quirk_detect_quiet_flag:1; + unsigned int set_afs_bit:1; }; /** @@ -457,6 +458,17 @@ static inline u16 cdns_pcie_rp_readw(struct cdns_pcie *pcie, u32 reg) return cdns_pcie_read_sz(addr, 0x2); } +static inline void cdns_pcie_rp_writel(struct cdns_pcie *pcie, + u32 reg, u32 value) +{ + writel(value, pcie->reg_base + CDNS_PCIE_RP_BASE + reg); +} + +static inline u32 cdns_pcie_rp_readl(struct cdns_pcie *pcie, u32 reg) +{ + return readl(pcie->reg_base + CDNS_PCIE_RP_BASE + reg); +} + /* Endpoint Function register access */ static inline void cdns_pcie_ep_fn_writeb(struct cdns_pcie *pcie, u8 fn, u32 reg, u8 value)