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 X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C1CB9C10F14 for ; Tue, 23 Apr 2019 09:29:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 922C221738 for ; Tue, 23 Apr 2019 09:29:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="XgKOyJs1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726893AbfDWJ3k (ORCPT ); Tue, 23 Apr 2019 05:29:40 -0400 Received: from hqemgate14.nvidia.com ([216.228.121.143]:7928 "EHLO hqemgate14.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726304AbfDWJ3j (ORCPT ); Tue, 23 Apr 2019 05:29:39 -0400 Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqemgate14.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Tue, 23 Apr 2019 02:29:44 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Tue, 23 Apr 2019 02:29:38 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Tue, 23 Apr 2019 02:29:38 -0700 Received: from HQMAIL109.nvidia.com (172.20.187.15) by HQMAIL106.nvidia.com (172.18.146.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 23 Apr 2019 09:29:37 +0000 Received: from HQMAIL103.nvidia.com (172.20.187.11) by HQMAIL109.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 23 Apr 2019 09:29:35 +0000 Received: from manikanta-bm2.nvidia.com (172.20.13.39) by HQMAIL.nvidia.com (172.20.187.11) with Microsoft SMTP Server id 15.0.1473.3 via Frontend Transport; Tue, 23 Apr 2019 09:29:32 +0000 From: Manikanta Maddireddy To: , , , , , , CC: , , , Manikanta Maddireddy Subject: [PATCH V2 15/28] PCI: tegra: Update flow control timer frequency in Tegra210 Date: Tue, 23 Apr 2019 14:58:12 +0530 Message-ID: <20190423092825.759-16-mmaddireddy@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190423092825.759-1-mmaddireddy@nvidia.com> References: <20190423092825.759-1-mmaddireddy@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Content-Type: text/plain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1556011784; bh=AKLF/o8XbIc6Wx1NErdjF5v31weV/6qYMOYGNiHmijU=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=XgKOyJs1tkUlMf+T2j6mys7lK/H+15pOsy9ERftmwl8xKQlCxaKVWSVeTiIGupHMa oZDqfJDJNll4Xx1ASRguAD9bbQxmK3B/NiIFYxf7ZwQx4vgM0voo2ikne1I2LAjsS/ mVt81ho22O6skQKG4tr+fw3xsSLwHvzqxuMKGknsdrg7/mssD5rpBYgprmo6Pv2IIG wV1zXshR3/QTgAInKbUci1Gp4il/Ju/xpTbXqTJ7chPr1UZ2850KUgdqUtLi3oES9d IKiir7U1T162NjVPqbviw1Z4W6rwCyr2xt6A1YPAy9Rb4gFKTR7u0kMhCCLDnLUjC+ CpWk1SBnD0Tog== Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Recommended UpdateFC threshold in Tegra210 is 0x60 for best performance of x1 link. Setting this to 0x60 provides the best balance between number of UpdateFC packets and read data sent over the link. UpdateFC timer frequency is equal to twice the value of register content in nsec, i.e (2 * 0x60) = 192 nsec. Signed-off-by: Manikanta Maddireddy --- V2: Changed update_fc_val to update_fc_threshold drivers/pci/controller/pci-tegra.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c index b170ff20914c..7ab7d1387357 100644 --- a/drivers/pci/controller/pci-tegra.c +++ b/drivers/pci/controller/pci-tegra.c @@ -320,6 +320,7 @@ struct tegra_pcie_soc { bool update_clamp_threshold; bool program_deskew_time; bool raw_violation_fixup; + bool update_fc_timer; struct { struct { u32 rp_ectl_2_r1; @@ -668,6 +669,13 @@ static void tegra_pcie_apply_sw_fixup(struct tegra_pcie_port *port) value |= soc->update_fc_threshold; writel(value, port->base + RP_VEND_XP); } + + if (soc->update_fc_timer) { + value = readl(port->base + RP_VEND_XP); + value &= ~RP_VEND_XP_UPDATE_FC_THRESHOLD_MASK; + value |= soc->update_fc_threshold; + writel(value, port->base + RP_VEND_XP); + } } static void tegra_pcie_port_enable(struct tegra_pcie_port *port) @@ -2411,6 +2419,7 @@ static const struct tegra_pcie_soc tegra20_pcie = { .update_clamp_threshold = false, .program_deskew_time = false, .raw_violation_fixup = false, + .update_fc_timer = false, .ectl.enable = false, }; @@ -2438,6 +2447,7 @@ static const struct tegra_pcie_soc tegra30_pcie = { .update_clamp_threshold = false, .program_deskew_time = false, .raw_violation_fixup = false, + .update_fc_timer = false, .ectl.enable = false, }; @@ -2460,6 +2470,7 @@ static const struct tegra_pcie_soc tegra124_pcie = { .update_clamp_threshold = true, .program_deskew_time = false, .raw_violation_fixup = true, + .update_fc_timer = false, .ectl.enable = false, }; @@ -2470,6 +2481,8 @@ static const struct tegra_pcie_soc tegra210_pcie = { .pads_pll_ctl = PADS_PLL_CTL_TEGRA30, .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN, .pads_refclk_cfg0 = 0x90b890b8, + /* FC threshold is bit[25:18] */ + .update_fc_threshold = 0x01800000, .has_pex_clkreq_en = true, .has_pex_bias_ctrl = true, .has_intr_prsnt_sense = true, @@ -2480,6 +2493,7 @@ static const struct tegra_pcie_soc tegra210_pcie = { .update_clamp_threshold = true, .program_deskew_time = true, .raw_violation_fixup = false, + .update_fc_timer = true, .ectl = { .regs = { .rp_ectl_2_r1 = 0x0000000f, @@ -2519,6 +2533,7 @@ static const struct tegra_pcie_soc tegra186_pcie = { .update_clamp_threshold = false, .program_deskew_time = false, .raw_violation_fixup = false, + .update_fc_timer = false, .ectl.enable = false, }; -- 2.17.1