From patchwork Wed Sep 25 05:48:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hongxing Zhu X-Patchwork-Id: 13811628 X-Patchwork-Delegate: kw@linux.com 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 E4C731547E3; Wed, 25 Sep 2024 06:11:20 +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=1727244682; cv=none; b=j03OU2K6J3JyoWqx7P6cMxXR3bePM008SsOSxfW2P13ffY/o+Gvc+xbFQUNoR7eX2a0YoLVGwMgZ1DYiI+7VbNaRvvul43clQhfurtg9j6fww2LRhL5udHXmP7hK+bYVK1O4XVj/i51pYqFuK2mg3N1mwUxxe1gTS+EO/fGRzqA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727244682; c=relaxed/simple; bh=yxYhK0cG5aIl08hHVN84VTg9HtT1T9/hQgvtWYLi9to=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=TSg9bc/S/h/ncKLA+TFSfnURA5bnq1DlnK/WhbCGOdAmJyzJEOhPBI2JuCuumBfLHwY3FbcxsrteqsSxFN/PPIY67WTDgWIw2k7xYUBQ6qq3OKd6gPnQFblbQiEgqDv3AXEhYQBo6sK44YoLCeHQb1m78idnMlPSXn6PVmcGeqI= 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 44C43201FF5; Wed, 25 Sep 2024 08:11:13 +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 D792C201FED; Wed, 25 Sep 2024 08:11:12 +0200 (CEST) Received: from localhost.localdomain (shlinux2.ap.freescale.net [10.192.224.44]) by aprdc01srsp001v.ap-rdc01.nxp.com (Postfix) with ESMTP id BAC38183AD47; Wed, 25 Sep 2024 14:11:10 +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 v1 1/2] PCI: dwc: Fix resume failure if no EP is connected on some platforms Date: Wed, 25 Sep 2024 13:48:36 +0800 Message-Id: <1727243317-15729-2-git-send-email-hongxing.zhu@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1727243317-15729-1-git-send-email-hongxing.zhu@nxp.com> References: <1727243317-15729-1-git-send-email-hongxing.zhu@nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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. Change call to 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 functionality") 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/pci/controller/dwc/pcie-designware-host.c index a0822d5371bc..cb8c3c2bcc79 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; - if (dw_pcie_get_ltssm(pci) <= DW_PCIE_LTSSM_DETECT_ACT) - return 0; - - if (pci->pp.ops->pme_turn_off) - pci->pp.ops->pme_turn_off(&pci->pp); - else - ret = dw_pcie_pme_turn_off(pci); + if (dw_pcie_get_ltssm(pci) > DW_PCIE_LTSSM_DETECT_ACT) { + /* Only send out PME_TURN_OFF when PCIE link is up */ + if (pci->pp.ops->pme_turn_off) + pci->pp.ops->pme_turn_off(&pci->pp); + else + ret = dw_pcie_pme_turn_off(pci); - if (ret) - return ret; + if (ret) + return ret; - ret = read_poll_timeout(dw_pcie_get_ltssm, val, val == DW_PCIE_LTSSM_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 = read_poll_timeout(dw_pcie_get_ltssm, val, val == DW_PCIE_LTSSM_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; + } } if (pci->pp.ops->deinit)