From patchwork Mon Jun 19 15:04:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 13284688 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 313F5C001DE for ; Mon, 19 Jun 2023 15:06:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229846AbjFSPGP (ORCPT ); Mon, 19 Jun 2023 11:06:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53778 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231583AbjFSPFZ (ORCPT ); Mon, 19 Jun 2023 11:05:25 -0400 Received: from mail-pg1-x52c.google.com (mail-pg1-x52c.google.com [IPv6:2607:f8b0:4864:20::52c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B37741700 for ; Mon, 19 Jun 2023 08:04:52 -0700 (PDT) Received: by mail-pg1-x52c.google.com with SMTP id 41be03b00d2f7-54f85f8b961so2735846a12.3 for ; Mon, 19 Jun 2023 08:04:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1687187092; x=1689779092; 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=BAHgbKUGLDFGyzp+XWYZ2sseIunYBsYQIO/Xldf05CU=; b=XvdhBRHXtdzN60JPoHiXZGxe3Wk8p3gEVy+80P/yCIUnn5q/UjEz6wGlLUXO/Tcp/B p8G1lcxkxYlP5xBp89pAbZZsu5TTC+qOgOXZx0qANDXGrqsKG5jlWFQVYeQMgog4GiVg wdxkf03RP9va75x46RLsvNHYZv9BMqmZ8LQqPta7Z6Zq8i+eA+ZPRky6UY20MUYFYLkr AiJCUirnH8hMizZurVOfFD4mTj3SdBbkydnp+kTqBxXNiyFRO5NJsTl5mYeFNPA5V9gf rSIvT9+E06Kh8dESXnCMURATxRR6WFsSxEu8qtTmzg8ahZcvAundvWcd7CY1HHfnvrf3 CsnQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687187092; x=1689779092; 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=BAHgbKUGLDFGyzp+XWYZ2sseIunYBsYQIO/Xldf05CU=; b=ZZbN12Ee4TnEfTrvzxpLvhIkVi+GTT2lQguDxXgvXpV/SvKI0NiglGZekzLD5j8yIx rXc/C7xpuupfvUlOlmEBPYvMDyJe+4V1sfxhBedxFMZHv89kuR/EiXW75zvmi6hTazyI 9K3JZE73v40nzjh/FmgNFpWEA8pA/KkK9jIu7PBwwqcrhkfp91BVUpKau1diUO9IISqn txHFCiynwrzidNwYm86xZgN6/MoGYiYMcEAEaXkroHZCX16MAHiwsyTG4nsYOpkAuG8b Uj4ZDjAIOT3MzOJOvkSRTlZpXXotTWcpEfA8WzoRpWPD4ZVPUg4QZ1sKVG/laRmp8ag1 YwYw== X-Gm-Message-State: AC+VfDwpmuZcoknflnJRiqXqiIg05w0bkdinxMO0jhVDPip+E6oDyKB5 r3yWVHWxAxtDs1NcbzgRZQ7a X-Google-Smtp-Source: ACHHUZ6mX5eL59bpG47z5VL6nwHLS8G/J72KGT7pv4yLTGgHpPgvjAqo6OiEFj63qn6HUCs8V7wiOA== X-Received: by 2002:a17:90a:df95:b0:25b:e216:bc15 with SMTP id p21-20020a17090adf9500b0025be216bc15mr10269006pjv.23.1687187092079; Mon, 19 Jun 2023 08:04:52 -0700 (PDT) Received: from localhost.localdomain ([117.217.183.37]) by smtp.gmail.com with ESMTPSA id 10-20020a17090a19ca00b0025efaf7a0d3sm2765480pjj.14.2023.06.19.08.04.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Jun 2023 08:04:51 -0700 (PDT) From: Manivannan Sadhasivam To: lpieralisi@kernel.org, kw@linux.com, bhelgaas@google.com Cc: robh@kernel.org, andersson@kernel.org, konrad.dybcio@linaro.org, linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, steev@kali.org, quic_srichara@quicinc.com, Manivannan Sadhasivam Subject: [PATCH v4 9/9] PCI: qcom: Do not advertise hotplug capability for IP v2.1.0 Date: Mon, 19 Jun 2023 20:34:08 +0530 Message-Id: <20230619150408.8468-10-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230619150408.8468-1-manivannan.sadhasivam@linaro.org> References: <20230619150408.8468-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org SoCs making use of Qcom PCIe controller IP v2.1.0 do not support hotplug functionality. But the hotplug capability bit is set by default in the hardware. This causes the kernel PCI core to register hotplug service for the controller and send hotplug commands to it. But those commands will timeout generating messages as below during boot and suspend/resume. [ 5.782159] pcieport 0001:00:00.0: pciehp: Timeout on hotplug command 0x03c0 (issued 2020 msec ago) [ 5.810161] pcieport 0001:00:00.0: pciehp: Timeout on hotplug command 0x03c0 (issued 2048 msec ago) [ 7.838162] pcieport 0001:00:00.0: pciehp: Timeout on hotplug command 0x07c0 (issued 2020 msec ago) [ 7.870159] pcieport 0001:00:00.0: pciehp: Timeout on hotplug command 0x07c0 (issued 2052 msec ago) This not only spams the console output but also induces a delay of a couple of seconds. To fix this issue, let's clear the HPC bit in PCI_EXP_SLTCAP register as a part of the post init sequence to not advertise the hotplug capability for the controller. Signed-off-by: Manivannan Sadhasivam --- drivers/pci/controller/dwc/pcie-qcom.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index 612266fb849a..7a87a47eb7ed 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -438,6 +438,8 @@ static int qcom_pcie_post_init_2_1_0(struct qcom_pcie *pcie) writel(CFG_BRIDGE_SB_INIT, pci->dbi_base + AXI_MSTR_RESP_COMP_CTRL1); + qcom_pcie_clear_hpc(pcie->pci); + return 0; }