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Sat, 3 Aug 2024 03:23:28 GMT Received: from hu-krichai-hyd.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Fri, 2 Aug 2024 20:23:22 -0700 From: Krishna chaitanya chundru Date: Sat, 3 Aug 2024 08:52:50 +0530 Subject: [PATCH v2 4/8] PCI: Change the parent to correctly represent pcie hierarchy Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <20240803-qps615-v2-4-9560b7c71369@quicinc.com> References: <20240803-qps615-v2-0-9560b7c71369@quicinc.com> In-Reply-To: <20240803-qps615-v2-0-9560b7c71369@quicinc.com> To: Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy?= =?utf-8?q?=C5=84ski?= , Rob Herring , Bjorn Helgaas , Krzysztof Kozlowski , Conor Dooley , Konrad Dybcio , , "Bartosz Golaszewski" , Jingoo Han , "Manivannan Sadhasivam" CC: , , , , , , "Bartosz Golaszewski" , Krishna chaitanya chundru X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1722655379; l=2478; i=quic_krichai@quicinc.com; s=20230907; h=from:subject:message-id; bh=/UJecY37sURWFmZx6zfajLYjVRo/C7QywTe44hmNwtY=; b=ft0/oYYzPz1BSC1O8f5dxF9VSgTCN6N/utq+sq+chwRXNh11usVfzHXFW2SacCAna9OcwDnCo Ggvy0uhcKTYDrDjemyrCC5kmhlNdK2emGRHLNhw7vzrVqVixIZXRL72 X-Developer-Key: i=quic_krichai@quicinc.com; a=ed25519; pk=10CL2pdAKFyzyOHbfSWHCD0X0my7CXxj8gJScmn1FAg= X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: b1MA5kdoT896RYWqnYfAwtMHA2tC0EPH X-Proofpoint-ORIG-GUID: b1MA5kdoT896RYWqnYfAwtMHA2tC0EPH X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-08-02_20,2024-08-02_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 mlxlogscore=643 clxscore=1015 spamscore=0 malwarescore=0 lowpriorityscore=3 impostorscore=0 suspectscore=0 adultscore=0 mlxscore=0 bulkscore=3 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2407110000 definitions=main-2408030020 Currently the pwrctl driver is child of pci-pci bridge driver, this will cause issue when suspend resume is introduced in the pwr control driver. If the supply is removed to the endpoint in the power control driver then the config space access by the pci-pci bridge driver can cause issues like Timeouts. For this reason change the parent to controller from pci-pci bridge. Fixes: 4565d2652a37 ("PCI/pwrctl: Add PCI power control core code") Signed-off-by: Krishna chaitanya chundru Acked-by: Bartosz Golaszewski Tested-by: Bartosz Golaszewski --- drivers/pci/bus.c | 3 ++- drivers/pci/pwrctl/core.c | 9 ++++++++- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c index 55c853686051..15b42f0f588f 100644 --- a/drivers/pci/bus.c +++ b/drivers/pci/bus.c @@ -328,6 +328,7 @@ void __weak pcibios_bus_add_device(struct pci_dev *pdev) { } */ void pci_bus_add_device(struct pci_dev *dev) { + struct pci_host_bridge *host = pci_find_host_bridge(dev->bus); struct device_node *dn = dev->dev.of_node; int retval; @@ -352,7 +353,7 @@ void pci_bus_add_device(struct pci_dev *dev) if (dev_of_node(&dev->dev) && pci_is_bridge(dev)) { retval = of_platform_populate(dev_of_node(&dev->dev), NULL, NULL, - &dev->dev); + host->dev.parent); if (retval) pci_err(dev, "failed to populate child OF nodes (%d)\n", retval); diff --git a/drivers/pci/pwrctl/core.c b/drivers/pci/pwrctl/core.c index feca26ad2f6a..4f2ffa0b0a5f 100644 --- a/drivers/pci/pwrctl/core.c +++ b/drivers/pci/pwrctl/core.c @@ -11,6 +11,8 @@ #include #include +#include "../pci.h" + static int pci_pwrctl_notify(struct notifier_block *nb, unsigned long action, void *data) { @@ -64,18 +66,23 @@ static int pci_pwrctl_notify(struct notifier_block *nb, unsigned long action, */ int pci_pwrctl_device_set_ready(struct pci_pwrctl *pwrctl) { + struct pci_bus *bus; int ret; if (!pwrctl->dev) return -ENODEV; + bus = pci_find_bus(of_get_pci_domain_nr(pwrctl->dev->parent->of_node), 0); + if (!bus) + return -ENODEV; + pwrctl->nb.notifier_call = pci_pwrctl_notify; ret = bus_register_notifier(&pci_bus_type, &pwrctl->nb); if (ret) return ret; pci_lock_rescan_remove(); - pci_rescan_bus(to_pci_dev(pwrctl->dev->parent)->bus); + pci_rescan_bus(bus); pci_unlock_rescan_remove(); return 0;