From patchwork Wed Nov 4 08:50:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vidya Sagar X-Patchwork-Id: 1393705 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-tegra-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=nvidia.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=nvidia.com header.i=@nvidia.com header.a=rsa-sha256 header.s=n1 header.b=qcoyRoCZ; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CR0ld0p1Vz9sTK for ; Wed, 4 Nov 2020 19:52:29 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728776AbgKDIw2 (ORCPT ); Wed, 4 Nov 2020 03:52:28 -0500 Received: from hqnvemgate24.nvidia.com ([216.228.121.143]:2627 "EHLO hqnvemgate24.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728675AbgKDIwU (ORCPT ); Wed, 4 Nov 2020 03:52:20 -0500 Received: from hqmail.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate24.nvidia.com (using TLS: TLSv1.2, AES256-SHA) id ; Wed, 04 Nov 2020 00:52:22 -0800 Received: from HQMAIL105.nvidia.com (172.20.187.12) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 4 Nov 2020 08:52:16 +0000 Received: from vidyas-desktop.nvidia.com (10.124.1.5) by mail.nvidia.com (172.20.187.12) with Microsoft SMTP Server id 15.0.1473.3 via Frontend Transport; Wed, 4 Nov 2020 08:52:12 +0000 From: Vidya Sagar To: , , , , , , , CC: , , , , , , Subject: [PATCH V3 1/5] PCI: tegra: Fix ASPM-L1SS advertisement disable code Date: Wed, 4 Nov 2020 14:20:14 +0530 Message-ID: <20201104085018.13021-2-vidyas@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201104085018.13021-1-vidyas@nvidia.com> References: <20201104085018.13021-1-vidyas@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1604479942; bh=pE6B5W32IRU6jU0blW1A2aBVvj4gHjrSf7CmW+Ju6pg=; h=From:To:CC:Subject:Date:Message-ID:X-Mailer:In-Reply-To: References:X-NVConfidentiality:MIME-Version:Content-Type; b=qcoyRoCZ0piUYe73ac3RXhzFqb2XBUMAuLGZRxa+DjUUQ5uozNBm3gFVaoF5cyHQQ mbqzO9QHYJTjrKgl4cAn++kssJLlXXLQebPPOghBi4Y3q1rnKU89Thed9MLnWW9HeD xbhG0wgKxqBSk4esSaGr2HY66uIbG/Q5alsc9BdnUjORlIp8kuGfRX20iV9GwCeDan aab0YZCQbePSm0DP2XG/UlH0qNLAJADjyYKvcNdik0SdB7KViwJo2hGTgVyXjRC6F5 PY+0BIpRq4DV5+HHt7nSRwiZt3V4OhydPMpC+d9rnw0UfjDG4Yr3fiLhWdmnAtCb0r dhUpxYsdCUumw== Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org If the absence of CLKREQ# signal is indicated by the absence of "supports-clkreq" in the device-tree node, current driver is disabling the advertisement of ASPM-L1 Sub-States *before* the ASPM-L1 Sub-States offset is correctly initialized. Since default value of the ASPM-L1SS offset is zero, this is causing the Vendor-ID wrongly programmed to 0x10d2 instead of Nvidia's 0x10de thereby the quirks applicable for Tegra194 are not being applied. This patch fixes this issue by refactoring the code that disables the ASPM-L1SS advertisement. Fixes: 56e15a238d92 ("PCI: tegra: Add Tegra194 PCIe support") Signed-off-by: Vidya Sagar --- V3: * None V2: * None drivers/pci/controller/dwc/pcie-tegra194.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c index aa511ec0d800..b172b1d49713 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -896,6 +896,12 @@ static void tegra_pcie_prepare_host(struct pcie_port *pp) init_host_aspm(pcie); + /* Disable ASPM-L1SS advertisement if there is no CLKREQ routing */ + if (!pcie->supports_clkreq) { + disable_aspm_l11(pcie); + disable_aspm_l12(pcie); + } + val = dw_pcie_readl_dbi(pci, GEN3_RELATED_OFF); val &= ~GEN3_RELATED_OFF_GEN3_ZRXDC_NONCOMPL; dw_pcie_writel_dbi(pci, GEN3_RELATED_OFF, val); @@ -1400,12 +1406,6 @@ static int tegra_pcie_config_controller(struct tegra_pcie_dw *pcie, pcie->pcie_cap_base = dw_pcie_find_capability(&pcie->pci, PCI_CAP_ID_EXP); - /* Disable ASPM-L1SS advertisement as there is no CLKREQ routing */ - if (!pcie->supports_clkreq) { - disable_aspm_l11(pcie); - disable_aspm_l12(pcie); - } - return ret; fail_phy: