From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C46FC30ACF1 for ; Thu, 5 Mar 2026 09:00:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772701229; cv=none; b=EdUTXHKN7jUXj69JrQjMSBybrAAtNI4GYO1oN5WjC1w0lbVRCTRFkHrW6xvGXM5rYaV4mgQFLwNIt1fNrg9zxe/2fesyNvrYSpAi9t31IUgbuQ2Hljt4TFoXF038yq3p0BH3jUSKcSFgr3TbFoqB5amN9iGH1ug1jHh7oLACCgY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772701229; c=relaxed/simple; bh=n9Fc58azlTl88dGqttef7BVIdeXVIZctkw5Ln4SbTVg=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=E+fFXPZTXWwTLsca4QYwbr5KX6LTRXBXrAqCvMKdC5xZa/W/nO9vg5xePYKEbQvQpKedaiF0PMeodxXKX1W6Uvv+MMQ9VuYevr4X0UdL67TWbIZpTxa1bKqHp9TPFqb/VUrHWd55reqAXmxugJXFI6zW7WsPXr6TcUggCwyReTM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com; spf=pass smtp.mailfrom=oss.qualcomm.com; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b=P52m3yX2; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b=hIg9fP8f; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b="P52m3yX2"; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b="hIg9fP8f" Received: from pps.filterd (m0279871.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 6251CFuc3473621 for ; Thu, 5 Mar 2026 09:00:27 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= AiHEjSZAG4Mqfi9SoOwsJ/RPKZBaqWBE4m83Wyn/ybs=; b=P52m3yX2Xvq1ovMd xX2lLqrEVfvXZxZEGlfrwt6OtPMkLFtUDIsBR16e3VWXHw5TLGVjwnTL68Z762pH izetg/Gt6qaRXjyqXJOfWo5879w4oIVdfyzYle6x9AVbkG//Ik58BhtWYG1Hdj9m U4MAOWixwsi03L/GSb2HqojNaKFtoWvWx7LQYMZJb/kRQI0n8RNa9H7JHRexKD6b FE+J0ZFRiefZwnDLtpwwkeaVNiQBcuv+Ht51UJ/g4sa+JlUTsq3g4TdRrvS54J/V pkISgqbpekr2i72GIzfISCzcjuw+vDabMAyHzdI8cLiuy1MJrBplrMMYC490iEFd 7DUy/w== Received: from mail-pf1-f198.google.com (mail-pf1-f198.google.com [209.85.210.198]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4cpj184197-1 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT) for ; Thu, 05 Mar 2026 09:00:26 +0000 (GMT) Received: by mail-pf1-f198.google.com with SMTP id d2e1a72fcca58-824b42b8a81so26805739b3a.3 for ; Thu, 05 Mar 2026 01:00:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oss.qualcomm.com; s=google; t=1772701226; x=1773306026; darn=vger.kernel.org; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=AiHEjSZAG4Mqfi9SoOwsJ/RPKZBaqWBE4m83Wyn/ybs=; b=hIg9fP8fPaSURU4bw6DVLhhtoRGPoO4tQFC+cbRKIExEI56JjYgM2h6F+zdn5epsQN Hcf4+TJ2QKJXQarcZbWTYlDySz5+yhTK+mn3Amoz60dJddL1iEx+o4dHAbNS7Jddz7bC afo5G7xPJNvJik3ktIQJVjUxk8d11JuFe00ZAQdZ/PpmzWJcoZpDoFX6Tkr4ncIaiQoS pYShwWV2AaN/o62CN8zgWDqDY1mSRiXxPHPVzhczNyHC/U2FzNl8xyw02wwVVsXi7tJf QdukvEnA8sHGY3q1PADff/m4Vv3ieHoqVFPotIPrNQZzGoNl86PJgKzOJearIi2By1CT Wx+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772701226; x=1773306026; h=content-transfer-encoding:in-reply-to:from:content-language :references:cc:to:subject:user-agent:mime-version:date:message-id :x-gm-gg:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=AiHEjSZAG4Mqfi9SoOwsJ/RPKZBaqWBE4m83Wyn/ybs=; b=Cy4KOGGU/7W1xEl0kk4pXG75/8whpLtErhTU9qayKyOU2e0EVZGRlq+EHxKQOThPpV 8pewSqnbbSSIVeEJX9VHen/EiWpzGsADLNWuSykWVaF4OMRsh0obLJGF98lQ4Ngv2/cg vnrUkq4+WmvydbEw/uAfSuMCVKPWFl0V/ZESFGbQ/TjW8/e54oLPND4q3ERwL3PilwrZ KOsMRozGGqyOitXMpJx+z3fjN/vlq1n07+D9JthRI0cZLNRiGQ8x7N+Exg+JcpBgodW9 0lxbawBI2HbqLRkcJxfFIKGj+rOwLcao9igb37YDPr0Gkpb3jCqE1dMFy3jHPbTza99s 5mTw== X-Forwarded-Encrypted: i=1; AJvYcCXZVp9B17yMY6ozV1uE6GrypvKMPD2CBAdQ/yZBfibDUS+ytV0ZDGXv+Yq4nt06o7czgF1Y/q6t+mPB+4I=@vger.kernel.org X-Gm-Message-State: AOJu0Yx5wZozkz4caLAD93yBx03VEryMStIuXix/hu5OqCJ4WnaGFnl2 Mlcgv9n5RT0FJ+SrwbcTHYJEnoD7EQJwwL9aPZzenBlCAnJ3VTSrWvGpRI/4Ft+NFngl9H5uhae cMwswdyYs9Cl4sdSsVxNa0L89yeXGQTi0ELRGT+kyXLphwm/+6OzHAqa7WYRMO6v8lm4WOFnddz s= X-Gm-Gg: ATEYQzy6NcFOQPPlpIgkkFkgKErjGq7ntZ3OLf2S+ZnHg2TbyANS9foyeqD2ggGEl0q gjzQHiWB+5BzMXf26FERKNwioF+wWMhIdPYhMt1oEf8MpeRMfX/WFtwd4urAiJc33FtCYuZ7T6Q KFK/9tVwCOuHTa1i96Ny/ZYpTaUOLDyBHHorloO/yZNyGCU4P6Z9uCuVgfiOrD1Lu3PlqvfjVzU R8bYhlJCvjBR0p5G/4hVWD4H43LmiPD2SjXAFUpEBwEM8bFwcGvRs5k7Z1btLjAVdXfmSsCqaQk 6rCx4ukp0dA3N9iVx5KVhT+Vuy18By/HuOd8kVNdwWNSq9kMfF9IExibrZ9vKDi8Ye4zvNW4l0l WU4LmosL3DzukC5ipLTSMTU0HaYdRICDRLrj9NxZtcyiS1dQFL6npkg== X-Received: by 2002:a05:6a00:1ca2:b0:81f:5f49:6913 with SMTP id d2e1a72fcca58-82972c326aemr4406451b3a.30.1772701225502; Thu, 05 Mar 2026 01:00:25 -0800 (PST) X-Received: by 2002:a05:6a00:1ca2:b0:81f:5f49:6913 with SMTP id d2e1a72fcca58-82972c326aemr4406402b3a.30.1772701224928; Thu, 05 Mar 2026 01:00:24 -0800 (PST) Received: from [10.218.35.45] ([202.46.22.19]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8297ef26eb1sm2222701b3a.49.2026.03.05.01.00.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 05 Mar 2026 01:00:24 -0800 (PST) Message-ID: Date: Thu, 5 Mar 2026 14:30:17 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 5/5] PCI: qcom: Add D3cold support To: Manivannan Sadhasivam Cc: Jingoo Han , Lorenzo Pieralisi , =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= , Rob Herring , Bjorn Helgaas , Will Deacon , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, jonathanh@nvidia.com, bjorn.andersson@oss.qualcomm.com References: <20260217-d3cold-v2-0-89b322864043@oss.qualcomm.com> <20260217-d3cold-v2-5-89b322864043@oss.qualcomm.com> Content-Language: en-US From: Krishna Chaitanya Chundru In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: fmaDBeCFVIWCDKoLgjqym_uEqNf2T_sd X-Proofpoint-ORIG-GUID: fmaDBeCFVIWCDKoLgjqym_uEqNf2T_sd X-Authority-Analysis: v=2.4 cv=Ed7FgfmC c=1 sm=1 tr=0 ts=69a9462a cx=c_pps a=m5Vt/hrsBiPMCU0y4gIsQw==:117 a=fChuTYTh2wq5r3m49p7fHw==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=3WHJM1ZQz_JShphwDgj5:22 a=EUspDBNiAAAA:8 a=cbGetAF2pF-RjulI4vsA:9 a=QEXdDO2ut3YA:10 a=IoOABgeZipijB_acs4fv:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzA1MDA3MSBTYWx0ZWRfXz57J4iVLdGex mVjUd3Hl13QmXTzG+GxE80vCXBialz8YQia9DkSnHex1H8/1dUXSyJ6NtrcIGf84pN5V4/NBpIf XnYF4eGfIJHpAxFJbcPkSydmse/22BKIMZo2ckCx49YddJDuIUIvcBdrUQFqYG3wW7ToGBh+kDu M7X9cokHVvZ3sWh5ihChnWhqnwNdjU5uSK/SjMnIgpPAiMM/aIel8SRLvxvFSy8j0aGsTWtGfSg mcb51wuMj8rUuR56WHJRZHmlcCPrm01a0Jg0jm3FRXJgGRsnZkvLwJbA40HSEq9ELQ2OtBnGVje Rc/0zx3N6SC23QtF76OfHuFuJoSA/zQIvLLP46mx2Soi9aJ8ZDsS91L/9C4aHKVTgtDz6FhKGxP fbhp8JlrJemhPmNGcuf+iq3cAbW4GV20143049A8EJ+dck1eGhVGRPirKP0TLyPvz8Bitm0/F8p M8YDzF9FM8m4SXXprlQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-05_02,2026-03-04_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 suspectscore=0 spamscore=0 adultscore=0 lowpriorityscore=0 clxscore=1015 malwarescore=0 impostorscore=0 priorityscore=1501 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603050071 On 3/5/2026 1:28 PM, Manivannan Sadhasivam wrote: > On Tue, Feb 17, 2026 at 04:49:10PM +0530, Krishna Chaitanya Chundru wrote: >> Add support for transitioning Qcom PCIe controllers into D3cold by > You cannot transition a 'PCIe controller' to D3Cold state, but only the > endpoints and bridges. > >> integrating with the DWC core suspend/resume helpers. >> >> Implement PME_TurnOff message generation via ELBI_SYS_CTRL and hook it >> into the DWC host operations so the controller follows the standard >> PME_TurnOff-based power-down sequence before entering D3cold. >> >> When the link is suspended into D3cold, fully tear down interconnect > You cannot suspend a link into D3Cold. Link and D-State are different. > >> bandwidth, OPP votes. If D3cold is not entered, retain existing behavior >> by keeping the required interconnect and OPP votes. >> >> Drop the qcom_pcie::suspended flag and rely on the existing >> dw_pcie::suspended state, which now drives both the power-management >> flow and the interconnect/OPP handling. >> >> Signed-off-by: Krishna Chaitanya Chundru >> --- >> drivers/pci/controller/dwc/pcie-qcom.c | 121 ++++++++++++++++++++------------- >> 1 file changed, 74 insertions(+), 47 deletions(-) >> >> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c >> index b02c19bbdf2ea5db252c2a0281a569bb3a0cc497..37442bbe588c36b0b0414cc4d0016da2d8424a87 100644 >> --- a/drivers/pci/controller/dwc/pcie-qcom.c >> +++ b/drivers/pci/controller/dwc/pcie-qcom.c >> @@ -145,6 +145,7 @@ > [...] > >> - if (pcie->suspended) { >> - ret = qcom_pcie_host_init(&pcie->pci->pp); >> - if (ret) >> - return ret; >> + ret = icc_enable(pcie->icc_mem); >> + if (ret) { >> + dev_err(dev, "Failed to enable PCIe-MEM interconnect path: %d\n", ret); >> + goto disable_icc_cpu; >> + } >> >> - pcie->suspended = false; >> + /* >> + * Ignore -ETIMEDOUT here since it is expected when no endpoint is >> + * connected to the PCIe link. >> + */ >> + ret = dw_pcie_resume_noirq(pcie->pci); >> + if (ret && (ret != -ETIMEDOUT)) > No, dw_pcie_resume_noirq() was reworked to return -ETIMEDOUT to indicate a hard > failure. If the device is not found, it will return -ENODEV. So you should > fail the resume if -ETIMEDOUT is returned. Ack, didn't noticed the reworked changes, I will change -ETIMEDOUT to -ENODEV. - Krishna Chaitanya. > - Mani >