From patchwork Mon Jun 15 21:06:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Marangi X-Patchwork-Id: 11605839 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 65D5914E3 for ; Mon, 15 Jun 2020 21:07:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4B39C207D3 for ; Mon, 15 Jun 2020 21:07:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="HJO8fxl5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731603AbgFOVGf (ORCPT ); Mon, 15 Jun 2020 17:06:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43062 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731659AbgFOVGc (ORCPT ); Mon, 15 Jun 2020 17:06:32 -0400 Received: from mail-ej1-x642.google.com (mail-ej1-x642.google.com [IPv6:2a00:1450:4864:20::642]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AD43DC061A0E; Mon, 15 Jun 2020 14:06:31 -0700 (PDT) Received: by mail-ej1-x642.google.com with SMTP id q19so18971644eja.7; Mon, 15 Jun 2020 14:06:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=CS8a9xmEYV2zxLnPApYUEQTrSfGGAUQgoBCAgN5bfRg=; b=HJO8fxl51MsYSZvPlWvkfVXGvnKbCKu9PsZddDTqeMd7r6CrVrWvHG8oIS94ZnQaPy GCUtzizqeUrYBF6cQQ+hksCXRnwgULl6hrW1zbPRavNi33EKR1dCkWjgy4t+PmthP19P PLZkXlSp7OgMEYEMe9EaxRHvj5xlkLZ+oYBGJIyKfJyLdNe2/Uei7o6zW06RjDeCM0tR Hd4NKxgNWwn6ihfnT+/Rk+DjNEXdM4bsed20as50O6JunMISD5A64GUNGCOZk59qq/K9 YS+ivTkpAM2JqziTQef0BJ1R2fGMRsUTCoqaX36mgTruW9VQ/m+nkO8YuAZPlG7fEIBD hqLw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=CS8a9xmEYV2zxLnPApYUEQTrSfGGAUQgoBCAgN5bfRg=; b=sJcemd8FhS3p0pBH9yLkCrw8jlcvxs2DPONMD71GrmAk9/7Ru5qtSbsC6MA3s217vV 0uU/Del0nYeJYWx9TaJ/60Xf8TXjsT6kkZLso+dccE30Af+sjIUNZB/jINe13975fGl+ yVtI9VShzLECBbOmtW+hdrxSZivcAHiDE8vESzCjv7f3/pvDmpiUZ2jEpPzfcKAlFZRy cZqQAAlkgxgSL/Fmz+2cjr/LUeEynBWSMgSFOLpVS5b/Wa+OPBvF9lbmFVokUsTrXGbY oH587/5NfPQE1sccoPBc1P+tph9M0KtP8kiBlzmjuPEHYRm57khKcuegqMZGlYyVHrUL 8gKQ== X-Gm-Message-State: AOAM530DSXqXJliWUmqOv3CMx9OMES80chOg2PJ8DxCaxnYTSJXCQvTS KgeCvzTKFS28NRWULWXxt0I= X-Google-Smtp-Source: ABdhPJzxQJYWD2zxH/0Cvmke6amig3FRjV+C5U4aGZUL0XDJK7ocGL62YRx1Ornbtozf2Vj3tcSwDA== X-Received: by 2002:a17:906:b88c:: with SMTP id hb12mr26824630ejb.483.1592255190309; Mon, 15 Jun 2020 14:06:30 -0700 (PDT) Received: from Ansuel-XPS.localdomain (host-95-238-254-39.retail.telecomitalia.it. [95.238.254.39]) by smtp.googlemail.com with ESMTPSA id d5sm9662226ejr.78.2020.06.15.14.06.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Jun 2020 14:06:29 -0700 (PDT) From: Ansuel Smith To: Rob Herring Cc: Vinod Koul , Ansuel Smith , stable@vger.kernel.org, Rob Herring , Andy Gross , Bjorn Andersson , Bjorn Helgaas , Mark Rutland , Stanimir Varbanov , Lorenzo Pieralisi , Andrew Murray , Philipp Zabel , linux-arm-msm@vger.kernel.org, linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v7 07/12] PCI: qcom: Define some PARF params needed for ipq8064 SoC Date: Mon, 15 Jun 2020 23:06:03 +0200 Message-Id: <20200615210608.21469-8-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.27.0.rc0 In-Reply-To: <20200615210608.21469-1-ansuelsmth@gmail.com> References: <20200615210608.21469-1-ansuelsmth@gmail.com> MIME-Version: 1.0 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Set some specific value for Tx De-Emphasis, Tx Swing and Rx equalization needed on some ipq8064 based device (Netgear R7800 for example). Without this the system locks on kernel load. Fixes: 82a823833f4e ("PCI: qcom: Add Qualcomm PCIe controller driver") Signed-off-by: Ansuel Smith Cc: stable@vger.kernel.org # v4.5+ Reviewed-by: Rob Herring --- drivers/pci/controller/dwc/pcie-qcom.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index f2ea1ab6f584..85313493d51b 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -77,6 +77,18 @@ #define DBI_RO_WR_EN 1 #define PERST_DELAY_US 1000 +/* PARF registers */ +#define PCIE20_PARF_PCS_DEEMPH 0x34 +#define PCS_DEEMPH_TX_DEEMPH_GEN1(x) ((x) << 16) +#define PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(x) ((x) << 8) +#define PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(x) ((x) << 0) + +#define PCIE20_PARF_PCS_SWING 0x38 +#define PCS_SWING_TX_SWING_FULL(x) ((x) << 8) +#define PCS_SWING_TX_SWING_LOW(x) ((x) << 0) + +#define PCIE20_PARF_CONFIG_BITS 0x50 +#define PHY_RX0_EQ(x) ((x) << 24) #define PCIE20_v3_PARF_SLV_ADDR_SPACE_SIZE 0x358 #define SLV_ADDR_SPACE_SZ 0x10000000 @@ -293,6 +305,7 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie) struct qcom_pcie_resources_2_1_0 *res = &pcie->res.v2_1_0; struct dw_pcie *pci = pcie->pci; struct device *dev = pci->dev; + struct device_node *node = dev->of_node; u32 val; int ret; @@ -347,6 +360,17 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie) val &= ~BIT(0); writel(val, pcie->parf + PCIE20_PARF_PHY_CTRL); + if (of_device_is_compatible(node, "qcom,pcie-ipq8064")) { + writel(PCS_DEEMPH_TX_DEEMPH_GEN1(24) | + PCS_DEEMPH_TX_DEEMPH_GEN2_3_5DB(24) | + PCS_DEEMPH_TX_DEEMPH_GEN2_6DB(34), + pcie->parf + PCIE20_PARF_PCS_DEEMPH); + writel(PCS_SWING_TX_SWING_FULL(120) | + PCS_SWING_TX_SWING_LOW(120), + pcie->parf + PCIE20_PARF_PCS_SWING); + writel(PHY_RX0_EQ(4), pcie->parf + PCIE20_PARF_CONFIG_BITS); + } + /* enable external reference clock */ val = readl(pcie->parf + PCIE20_PARF_PHY_REFCLK); val |= BIT(16);