From nobody Wed Nov 27 12:27:37 2024 Received: from inva021.nxp.com (inva021.nxp.com [92.121.34.21]) (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 81FED1A00E2; Thu, 10 Oct 2024 06:11:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=92.121.34.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728540679; cv=none; b=DUu4bSVCWzfK/Y6JIt+nuzRDcsZ09fZy30+pc6oKJJ2Zvvb6S92KJW5dXqDuB1b+e+WV/pqVHFUZHgWnC6yS57CgSWytcUCjuko9s3dDaP3EaUHtbHn8Ji778EyjbGzQh6KPBPCmXDP1XxJWSjqDoY7KLXIDI6JywAjChx7+jhs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728540679; c=relaxed/simple; bh=4NgXf7xSWI/1Sbxfwsz44UAu39ZpeOOq4QE/ebcvyE8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=IfuXGmbB1FZBuWCdCJSD2qOhM+oy/ZSd82h0F3t2h9sysCDEnM8AaBpqcr5UCpP06M5Nkm2L5hczlImMTwK3XdHQGcpvigb2ConZWyG35LP7GcyqerxkKZPu2LPNiugpLD6dIIydRxouEulqW9rFj1BqbGbB1yZkLr2an2PuVcE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=nxp.com; spf=pass smtp.mailfrom=nxp.com; arc=none smtp.client-ip=92.121.34.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=nxp.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=nxp.com Received: from inva021.nxp.com (localhost [127.0.0.1]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id DA8AD201EA0; Thu, 10 Oct 2024 08:11:15 +0200 (CEST) Received: from aprdc01srsp001v.ap-rdc01.nxp.com (aprdc01srsp001v.ap-rdc01.nxp.com [165.114.16.16]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 9EC9B2025CB; Thu, 10 Oct 2024 08:11:15 +0200 (CEST) Received: from localhost.localdomain (shlinux2.ap.freescale.net [10.192.224.44]) by aprdc01srsp001v.ap-rdc01.nxp.com (Postfix) with ESMTP id 0E8871846662; Thu, 10 Oct 2024 14:11:13 +0800 (+08) From: Richard Zhu To: jingoohan1@gmail.com, manivannan.sadhasivam@linaro.org, kwilczynski@kernel.org, bhelgaas@google.com, lpieralisi@kernel.org, frank.li@nxp.com, robh@kernel.org Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, imx@lists.linux.dev, Richard Zhu Subject: [PATCH v2 1/2] PCI: dwc: Fix resume failure if no EP is connected on some platforms Date: Thu, 10 Oct 2024 13:47:48 +0800 Message-Id: <1728539269-1861-2-git-send-email-hongxing.zhu@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1728539269-1861-1-git-send-email-hongxing.zhu@nxp.com> References: <1728539269-1861-1-git-send-email-hongxing.zhu@nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The dw_pcie_suspend_noirq() function currently returns success directly if no endpoint (EP) device is connected. However, on some platforms, power loss occurs during suspend, causing dw_resume() to do nothing in this case. This results in a system halt because the DWC controller is not initialized after power-on during resume. Call deinit() in suspend and init() at resume regardless of whether there are EP device connections or not. It is not harmful to perform deinit() and init() again for the no power-off case, and it keeps the code simple and consistent in logic. Fixes: 4774faf854f5 ("PCI: dwc: Implement generic suspend/resume functional= ity") Signed-off-by: Richard Zhu Reviewed-by: Frank Li --- .../pci/controller/dwc/pcie-designware-host.c | 30 +++++++++---------- 1 file changed, 15 insertions(+), 15 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pc= i/controller/dwc/pcie-designware-host.c index a0822d5371bc..a52101bbecf4 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -933,23 +933,23 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci) if (dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKCTL) & PCI_EXP_LNKCTL_ASPM= _L1) return 0; =20 - if (dw_pcie_get_ltssm(pci) <=3D DW_PCIE_LTSSM_DETECT_ACT) - return 0; - - if (pci->pp.ops->pme_turn_off) - pci->pp.ops->pme_turn_off(&pci->pp); - else - ret =3D dw_pcie_pme_turn_off(pci); + /* Only send out PME_TURN_OFF when PCIE link is up */ + if (dw_pcie_get_ltssm(pci) > DW_PCIE_LTSSM_DETECT_ACT) { + if (pci->pp.ops->pme_turn_off) + pci->pp.ops->pme_turn_off(&pci->pp); + else + ret =3D dw_pcie_pme_turn_off(pci); =20 - if (ret) - return ret; + if (ret) + return ret; =20 - ret =3D read_poll_timeout(dw_pcie_get_ltssm, val, val =3D=3D DW_PCIE_LTSS= M_L2_IDLE, - PCIE_PME_TO_L2_TIMEOUT_US/10, - PCIE_PME_TO_L2_TIMEOUT_US, false, pci); - if (ret) { - dev_err(pci->dev, "Timeout waiting for L2 entry! LTSSM: 0x%x\n", val); - return ret; + ret =3D read_poll_timeout(dw_pcie_get_ltssm, val, val =3D=3D DW_PCIE_LTS= SM_L2_IDLE, + PCIE_PME_TO_L2_TIMEOUT_US/10, + PCIE_PME_TO_L2_TIMEOUT_US, false, pci); + if (ret) { + dev_err(pci->dev, "Timeout waiting for L2 entry! LTSSM: 0x%x\n", val); + return ret; + } } =20 if (pci->pp.ops->deinit) --=20 2.37.1 From nobody Wed Nov 27 12:27:37 2024 Received: from inva020.nxp.com (inva020.nxp.com [92.121.34.13]) (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 6BB161A0732; Thu, 10 Oct 2024 06:11:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=92.121.34.13 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728540679; cv=none; b=KwjE6XEMvAEVTT38taSQTghzJKu1Ghzruam6M79uY3Xi4jZdflZeKY1VYd3w+0EslH9qdvNdP+UDO9R0EE2mirkTgxP5/2DQhbA+oahiPFyrTjQjhQkyFbxWnmuc7Y2ltUvtcMpka7Huvol0hYlfJMIpMMKKn6JGoyx9FCysUko= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728540679; c=relaxed/simple; bh=MwiKEE1wvhyJ9zJoLL3AnBu7gEh1iYNvknUkhR99PAk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=n+7+LSSuRtK18GbWuUrl6fkWuAPr7/V5A2vZiSxO1ErRUn8yKE1NhEFBPL+cMP0isgCCFDUnX0VRyQNjzcI5OxomGIwA4QjV6i4ryjNSAhYCenS71Mb7cq04wF9+Zv7vQJ+9FnPAH/XJYaetpVNG+Om03AhelHVwNkGTXCQ8Mk0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=nxp.com; spf=pass smtp.mailfrom=nxp.com; arc=none smtp.client-ip=92.121.34.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=nxp.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=nxp.com Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id E8B4A1A1E23; Thu, 10 Oct 2024 08:11:16 +0200 (CEST) Received: from aprdc01srsp001v.ap-rdc01.nxp.com (aprdc01srsp001v.ap-rdc01.nxp.com [165.114.16.16]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id AFC3B1A2894; Thu, 10 Oct 2024 08:11:16 +0200 (CEST) Received: from localhost.localdomain (shlinux2.ap.freescale.net [10.192.224.44]) by aprdc01srsp001v.ap-rdc01.nxp.com (Postfix) with ESMTP id 1EFBC1846661; Thu, 10 Oct 2024 14:11:15 +0800 (+08) From: Richard Zhu To: jingoohan1@gmail.com, manivannan.sadhasivam@linaro.org, kwilczynski@kernel.org, bhelgaas@google.com, lpieralisi@kernel.org, frank.li@nxp.com, robh@kernel.org Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, imx@lists.linux.dev, Richard Zhu Subject: [PATCH v2 2/2] PCI: dwc: Always stop link in the dw_pcie_suspend_noirq Date: Thu, 10 Oct 2024 13:47:49 +0800 Message-Id: <1728539269-1861-3-git-send-email-hongxing.zhu@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1728539269-1861-1-git-send-email-hongxing.zhu@nxp.com> References: <1728539269-1861-1-git-send-email-hongxing.zhu@nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" On i.MX8QM, PCIe link can't be re-established again in dw_pcie_resume_noirq(), if the LTSSM_EN bit is not cleared properly in dw_pcie_suspend_noirq(). Add dw_pcie_stop_link() into dw_pcie_suspend_noirq() to fix this issue and keep symmetric in suspend/resume function since there is dw_pcie_start_link() in dw_pcie_resume_noirq(). Fixes: 4774faf854f5 ("PCI: dwc: Implement generic suspend/resume functional= ity") Signed-off-by: Richard Zhu Reviewed-by: Manivannan Sadhasivam --- drivers/pci/controller/dwc/pcie-designware-host.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pc= i/controller/dwc/pcie-designware-host.c index a52101bbecf4..f673443d4098 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -952,6 +952,7 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci) } } =20 + dw_pcie_stop_link(pci); if (pci->pp.ops->deinit) pci->pp.ops->deinit(&pci->pp); =20 --=20 2.37.1