From patchwork Fri Oct 27 19:29:19 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manikanta Maddireddy X-Patchwork-Id: 831456 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-tegra-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3yNv9n6dk1z9t4X for ; Sat, 28 Oct 2017 06:30:53 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932237AbdJ0Tax (ORCPT ); Fri, 27 Oct 2017 15:30:53 -0400 Received: from hqemgate15.nvidia.com ([216.228.121.64]:17870 "EHLO hqemgate15.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932176AbdJ0Taw (ORCPT ); Fri, 27 Oct 2017 15:30:52 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate15.nvidia.com id ; Fri, 27 Oct 2017 12:30:17 -0700 Received: from HQMAIL104.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Fri, 27 Oct 2017 12:30:34 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Fri, 27 Oct 2017 12:30:34 -0700 Received: from HQMAIL104.nvidia.com (172.18.146.11) by HQMAIL104.nvidia.com (172.18.146.11) with Microsoft SMTP Server (TLS) id 15.0.1293.2; Fri, 27 Oct 2017 19:30:19 +0000 Received: from hqnvemgw02.nvidia.com (172.16.227.111) by HQMAIL104.nvidia.com (172.18.146.11) with Microsoft SMTP Server id 15.0.1293.2 via Frontend Transport; Fri, 27 Oct 2017 19:30:19 +0000 Received: from manikanta-pc.nvidia.com (Not Verified[10.19.65.28]) by hqnvemgw02.nvidia.com with Trustwave SEG (v7, 5, 8, 10121) id ; Fri, 27 Oct 2017 12:30:19 -0700 From: Manikanta Maddireddy To: , , CC: , , , , Manikanta Maddireddy Subject: [PATCH 02/12] PCI: tegra: Move REFCLK pad settings out of phy_power_on() Date: Sat, 28 Oct 2017 00:59:19 +0530 Message-ID: <1509132569-9398-3-git-send-email-mmaddireddy@nvidia.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1509132569-9398-1-git-send-email-mmaddireddy@nvidia.com> References: <1509132569-9398-1-git-send-email-mmaddireddy@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Sender: linux-tegra-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org In Tegra186 PHY programming is done by BPMP-FW, so PHY calls are skipped in driver. REFCLK pad settings are independent of PHY and should be programmed by driver. So move REFCLK pad settings out of phy_power_on(). These pad settings improves REFCLK peak to peak amplitude. Signed-off-by: Manikanta Maddireddy --- drivers/pci/host/pci-tegra.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c index b41c60c7414c..2c64eb6cc3cc 100644 --- a/drivers/pci/host/pci-tegra.c +++ b/drivers/pci/host/pci-tegra.c @@ -910,7 +910,6 @@ static int tegra_pcie_port_phy_power_off(struct tegra_pcie_port *port) static int tegra_pcie_phy_power_on(struct tegra_pcie *pcie) { struct device *dev = pcie->dev; - const struct tegra_pcie_soc *soc = pcie->soc; struct tegra_pcie_port *port; int err; @@ -936,12 +935,6 @@ static int tegra_pcie_phy_power_on(struct tegra_pcie *pcie) } } - /* Configure the reference clock driver */ - pads_writel(pcie, soc->pads_refclk_cfg0, PADS_REFCLK_CFG0); - - if (soc->num_ports > 2) - pads_writel(pcie, soc->pads_refclk_cfg1, PADS_REFCLK_CFG1); - return 0; } @@ -2049,6 +2042,17 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie) return 0; } +static void tegra_pcie_apply_pad_settings(struct tegra_pcie *pcie) +{ + const struct tegra_pcie_soc *soc = pcie->soc; + + /* Configure the reference clock driver */ + pads_writel(pcie, soc->pads_refclk_cfg0, PADS_REFCLK_CFG0); + + if (soc->num_ports > 2) + pads_writel(pcie, soc->pads_refclk_cfg1, PADS_REFCLK_CFG1); +} + /* * FIXME: If there are no PCIe cards attached, then calling this function * can result in the increase of the bootup time as there are big timeout @@ -2107,6 +2111,7 @@ static void tegra_pcie_enable_ports(struct tegra_pcie *pcie) struct device *dev = pcie->dev; struct tegra_pcie_port *port, *tmp; + tegra_pcie_apply_pad_settings(pcie); list_for_each_entry_safe(port, tmp, &pcie->ports, list) { dev_info(dev, "probing port %u, using %u lanes\n", port->index, port->lanes);