From patchwork Tue Apr 18 07:46:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rick Wertenbroek X-Patchwork-Id: 13215147 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com 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 189F7C77B78 for ; Tue, 18 Apr 2023 07:48:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231352AbjDRHsc (ORCPT ); Tue, 18 Apr 2023 03:48:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56258 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230244AbjDRHsP (ORCPT ); Tue, 18 Apr 2023 03:48:15 -0400 Received: from mail-ej1-x635.google.com (mail-ej1-x635.google.com [IPv6:2a00:1450:4864:20::635]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4EFFE10F4; Tue, 18 Apr 2023 00:47:56 -0700 (PDT) Received: by mail-ej1-x635.google.com with SMTP id fy21so27827288ejb.9; Tue, 18 Apr 2023 00:47:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1681804075; x=1684396075; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=8ZCZ5e5bMUuiLuVoL5OvscU41DtPpM74Tn58tXxWzas=; b=SaVyeU4Y/Xfw7a284ug9kXFgGGV9R70EM5r9/R6vLGR50D+F2O5lnksM3orQQ9KUPs 5fOuzhV5KAG44vpsCHdWPRpxtCkOMiJBF7I71YimKWnC/0p8jj99AI8IFgjyv8Uxa5PQ jvYESH1hZ26IgBju+L+WNC9tyI+sOQSQxvboGfu3TKG1kwd/rSJl7E6aa0PuW3ewmuZ9 lNHkiA8XKJVMn6Z6HgIvsQqroo11H2TQv2PkskCweHtkcG4ew4etoS3FOHA4xvwYsrp5 rmdW4jaq5L8iPqaVwXYYrnl5Dtj7nCaCrxhCo9iZqhfjJ+FGggmAd8o177jOdbaE3QSo Yiew== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1681804075; x=1684396075; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=8ZCZ5e5bMUuiLuVoL5OvscU41DtPpM74Tn58tXxWzas=; b=JSdP21IXmvHwOQAPK97JmJMNhdhJyAo/u7YuvydjaaEYhbU8ZDJbRs/ATszdhU4wjL 87rozARBheqKWQhrsE7SooN6JcYvnEO+06PzHmgEVYmtg0e05t5yamrbGxIYD55vkYat 6HYofkCpw+kQ0XbjM42djiEhkgB15mVtTKC2dzv+KjSydVeX85iS+2r/el2FvEGmniHf ubOEXLYE6ZzaGelBkqiwcmmbwE+AllNdHZ69r/d6I33yDGgaDQDVtmp1lwkDjPC7ieDQ WCN95hU7webzS09fEJRFIaP9K8gfnLjSfhAmzzd9lBJf1R1+OJ+kpxjoJ1IYycgebrZW uBMQ== X-Gm-Message-State: AAQBX9f9+14SkJ054rH0IsxaFP8VVkLyCydG3qjHttgz8qszn5r18nPI u/L6EYpBOWHgqo3Ejqe0PBiuq35oXWEgyw== X-Google-Smtp-Source: AKy350a6u35FLS9g3OrEFPFpy2W/guflwSS1XgidmyoL8Cj5s+O+s8QIC6mK4KWF+ct2yxETvhEcdw== X-Received: by 2002:a17:906:b242:b0:931:cd1b:3c0 with SMTP id ce2-20020a170906b24200b00931cd1b03c0mr8232669ejb.3.1681804074814; Tue, 18 Apr 2023 00:47:54 -0700 (PDT) Received: from A13PC04R.einet.ad.eivd.ch ([193.134.219.72]) by smtp.googlemail.com with ESMTPSA id gs8-20020a1709072d0800b0094f694e4ecbsm3048545ejc.146.2023.04.18.00.47.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Apr 2023 00:47:54 -0700 (PDT) From: Rick Wertenbroek To: alberto.dassatti@heig-vd.ch Cc: xxm@rock-chips.com, dlemoal@kernel.org, Rick Wertenbroek , stable@vger.kernel.org, Shawn Lin , Bjorn Helgaas , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84?= =?utf-8?q?ski?= , Rob Herring , Krzysztof Kozlowski , Heiko Stuebner , Corentin Labbe , Caleb Connolly , Brian Norris , Johan Jonker , Arnaud Ferraris , Judy Hsiao , Hugh Cole-Baker , linux-pci@vger.kernel.org, linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 04/11] PCI: rockchip: Add poll and timeout to wait for PHY PLLs to be locked Date: Tue, 18 Apr 2023 09:46:51 +0200 Message-Id: <20230418074700.1083505-5-rick.wertenbroek@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230418074700.1083505-1-rick.wertenbroek@gmail.com> References: <20230418074700.1083505-1-rick.wertenbroek@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The RK3399 PCIe controller should wait until the PHY PLLs are locked. Add poll and timeout to wait for PHY PLLs to be locked. If they cannot be locked generate error message and jump to error handler. Accessing registers in the PHY clock domain when PLLs are not locked causes hang The PHY PLLs status is checked through a side channel register. This is documented in the TRM section 17.5.8.1 "PCIe Initialization Sequence". Fixes: cf590b078391 ("PCI: rockchip: Add EP driver for Rockchip PCIe controller") Cc: stable@vger.kernel.org Reviewed-by: Damien Le Moal Tested-by: Damien Le Moal Signed-off-by: Rick Wertenbroek --- drivers/pci/controller/pcie-rockchip.c | 17 +++++++++++++++++ drivers/pci/controller/pcie-rockchip.h | 2 ++ 2 files changed, 19 insertions(+) diff --git a/drivers/pci/controller/pcie-rockchip.c b/drivers/pci/controller/pcie-rockchip.c index 990a00e08bc5..1aa84035a8bc 100644 --- a/drivers/pci/controller/pcie-rockchip.c +++ b/drivers/pci/controller/pcie-rockchip.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -153,6 +154,12 @@ int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip) } EXPORT_SYMBOL_GPL(rockchip_pcie_parse_dt); +#define rockchip_pcie_read_addr(addr) rockchip_pcie_read(rockchip, addr) +/* 100 ms max wait time for PHY PLLs to lock */ +#define RK_PHY_PLL_LOCK_TIMEOUT_US 100000 +/* Sleep should be less than 20ms */ +#define RK_PHY_PLL_LOCK_SLEEP_US 1000 + int rockchip_pcie_init_port(struct rockchip_pcie *rockchip) { struct device *dev = rockchip->dev; @@ -254,6 +261,16 @@ int rockchip_pcie_init_port(struct rockchip_pcie *rockchip) } } + err = readx_poll_timeout(rockchip_pcie_read_addr, + PCIE_CLIENT_SIDE_BAND_STATUS, + regs, !(regs & PCIE_CLIENT_PHY_ST), + RK_PHY_PLL_LOCK_SLEEP_US, + RK_PHY_PLL_LOCK_TIMEOUT_US); + if (err) { + dev_err(dev, "PHY PLLs could not lock, %d\n", err); + goto err_power_off_phy; + } + /* * Please don't reorder the deassert sequence of the following * four reset pins. diff --git a/drivers/pci/controller/pcie-rockchip.h b/drivers/pci/controller/pcie-rockchip.h index 51a123e5c0cf..f3a5ff1cf7f4 100644 --- a/drivers/pci/controller/pcie-rockchip.h +++ b/drivers/pci/controller/pcie-rockchip.h @@ -38,6 +38,8 @@ #define PCIE_CLIENT_MODE_EP HIWORD_UPDATE(0x0040, 0) #define PCIE_CLIENT_GEN_SEL_1 HIWORD_UPDATE(0x0080, 0) #define PCIE_CLIENT_GEN_SEL_2 HIWORD_UPDATE_BIT(0x0080) +#define PCIE_CLIENT_SIDE_BAND_STATUS (PCIE_CLIENT_BASE + 0x20) +#define PCIE_CLIENT_PHY_ST BIT(12) #define PCIE_CLIENT_DEBUG_OUT_0 (PCIE_CLIENT_BASE + 0x3c) #define PCIE_CLIENT_DEBUG_LTSSM_MASK GENMASK(5, 0) #define PCIE_CLIENT_DEBUG_LTSSM_L1 0x18