From patchwork Thu Jan 26 13:50:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rick Wertenbroek X-Patchwork-Id: 13117117 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 E22F3C61D97 for ; Thu, 26 Jan 2023 13:53:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231718AbjAZNxD (ORCPT ); Thu, 26 Jan 2023 08:53:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43422 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231714AbjAZNwv (ORCPT ); Thu, 26 Jan 2023 08:52:51 -0500 Received: from mail-ed1-x52e.google.com (mail-ed1-x52e.google.com [IPv6:2a00:1450:4864:20::52e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 11BCB561B2; Thu, 26 Jan 2023 05:52:37 -0800 (PST) Received: by mail-ed1-x52e.google.com with SMTP id m12so1911526edq.5; Thu, 26 Jan 2023 05:52:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; 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=PM5Y0kazrqAopyAd14Bg1D8C86SLWnGba3pwWureGTo=; b=qfPFLRS+a5cbguePUixRS979CRQ5NY7AVPXDzmN02A76rymCD1Sf/wEC5SDE3e7Spm XNBqCtXGmmPI1eZKPsBuLjWztNmxqM23awGKKM3J3sNvWWfBUkO2ISF/L/8tpZztNWe6 qqbpNYC46Me2h85qbAtEUaX1MQYC+k4eA219ccrBJftptBQgJtdEXRS4cH8YPwiQvnoR lFVLG9vywJxOq7sW+7mUBf/yQHxSCom938Zi79of7CHFvzlzQ9QvxaNiqlP5T2/XtoTc u48DlO4MoWDAWWaJK/Jx1o8sZc3V9NWqhb4Gux/9U/HB9YTdMZCdAheJR7dOC0CYQlKA aefw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; 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=PM5Y0kazrqAopyAd14Bg1D8C86SLWnGba3pwWureGTo=; b=1/OyZ2nbocrbGa/tTJFUuGXZ4x84EukJ4DC7XY9znMlwpsTw7wF38S2jlUjcHlt4f8 s0k43C7MLRbu4ZtwzQBK4JEeP+1G3IT4aRefZsNNtqo1XVkKq/PvSapicWt5VrhvezE3 R/c/mx/zvGf5M2l480/sYOowIRRpg5AOnaag9byjPbJxshcjm+PKk8ilA7WptyKprFEX RdLLIRr7KNRifbmlqhdHLSFrp474Ez/vMn7bDCCEPIOPj9CB0kBxUfo+mdeDPgK1wyeO AQNnt6OtdFtiBxO66OdFEJPg7Twi6xYNpyMrXTq/ASZwSVHFZ64mbITdcO19PkmXQ/0Z ypFg== X-Gm-Message-State: AFqh2kp+tBJpItsjFDACiUv2vjOYJvfVE5na2+V+Gksl6boezagAWxQ5 eMgiN+Xt1cgxTVRUkT24Q0Q= X-Google-Smtp-Source: AMrXdXuPlhOj7jDAVrt6QwPTrMne4wS7HKyWLhiCIc/EINEVuGxnCL9kGwTs0CiJ4lUZ8PQOtkZcpg== X-Received: by 2002:a05:6402:141:b0:46f:a6ea:202 with SMTP id s1-20020a056402014100b0046fa6ea0202mr38900619edu.37.1674741155772; Thu, 26 Jan 2023 05:52:35 -0800 (PST) Received: from A13PC04R.einet.ad.eivd.ch ([193.134.219.72]) by smtp.googlemail.com with ESMTPSA id t15-20020a508d4f000000b004a0e2fe619esm591611edt.39.2023.01.26.05.52.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Jan 2023 05:52:35 -0800 (PST) From: Rick Wertenbroek To: alberto.dassatti@heig-vd.ch Cc: xxm@rock-chips.com, wenrui.li@rock-chips.com, rick.wertenbroek@heig-vd.ch, Rick Wertenbroek , Rob Herring , Krzysztof Kozlowski , Heiko Stuebner , Shawn Lin , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84?= =?utf-8?q?ski?= , Bjorn Helgaas , Jani Nikula , Rodrigo Vivi , Mikko Kovanen , Greg Kroah-Hartman , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org Subject: [PATCH 4/8] PCI: rockchip: Added poll and timeout to wait for PHY PLLs to be locked Date: Thu, 26 Jan 2023 14:50:44 +0100 Message-Id: <20230126135049.708524-5-rick.wertenbroek@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230126135049.708524-1-rick.wertenbroek@gmail.com> References: <20230126135049.708524-1-rick.wertenbroek@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The Rockchip PCIe controller did not wait until the PHY PLLs were locked. This could cause hangs. Now the PHY PLLs status is checked through a side channel bit with a poll and timeout. If the PHY PLLs cannot lock an error is generated. This is documented in the TRM section 17.5.8.1 PCIe Initalization Sequence. Signed-off-by: Rick Wertenbroek --- drivers/pci/controller/pcie-rockchip.c | 16 ++++++++++++++++ drivers/pci/controller/pcie-rockchip.h | 2 ++ 2 files changed, 18 insertions(+) diff --git a/drivers/pci/controller/pcie-rockchip.c b/drivers/pci/controller/pcie-rockchip.c index 990a00e08..5f2e2dd5d 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 +261,15 @@ 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 51a123e5c..f3a5ff1cf 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