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Wysocki" Subject: [PATCH v16 7/9] PCI: Setup ACPI fwnode early and at the same time with OF Date: Tue, 17 Aug 2021 23:34:58 +0530 Message-Id: <20210817180500.1253-8-ameynarkhede03@gmail.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210817180500.1253-1-ameynarkhede03@gmail.com> References: <20210817180500.1253-1-ameynarkhede03@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Shanker Donthineni The pci_dev objects are created through two mechanisms 1) during PCI bus scan and 2) from I/O Virtualization. The fwnode in pci_dev object is being set at different places depends on the type of firmware used, device creation mechanism, and acpi_pci_bridge_d3(). The software features which have a dependency on ACPI fwnode properties and need to be handled before device_add() will not work. One use case, the software has to check the existence of _RST method to support ACPI based reset method. This patch does the two changes in order to provide fwnode consistently. - Set ACPI and OF fwnodes from pci_setup_device(). - Cleanup acpi_pci_bridge_d3() since FWNODE is available long before it's being called. After this patch, ACPI/OF firmware properties are visible at the same time during the early stage of pci_dev setup. And also call sites should be able to use firmware agnostic functions device_property_xxx() for the early PCI quirks in the future. Signed-off-by: Shanker Donthineni Reviewed-by: Alex Williamson --- drivers/pci/pci-acpi.c | 49 ++++++++++++++++-------------------------- drivers/pci/probe.c | 7 +++--- 2 files changed, 23 insertions(+), 33 deletions(-) diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index eaddbf701..e9a403191 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -941,55 +941,44 @@ void pci_set_acpi_fwnode(struct pci_dev *dev) acpi_pci_find_companion(&dev->dev)); } +static bool acpi_pci_power_manageable(struct pci_dev *dev) +{ + struct acpi_device *adev = ACPI_COMPANION(&dev->dev); + return adev ? acpi_device_power_manageable(adev) : false; +} + static bool acpi_pci_bridge_d3(struct pci_dev *dev) { - const struct fwnode_handle *fwnode; + const union acpi_object *obj; struct acpi_device *adev; - struct pci_dev *root; - u8 val; + struct pci_dev *rpdev; if (!dev->is_hotplug_bridge) return false; /* Assume D3 support if the bridge is power-manageable by ACPI. */ - pci_set_acpi_fwnode(dev); - adev = ACPI_COMPANION(&dev->dev); - - if (adev && acpi_device_power_manageable(adev)) + if (acpi_pci_power_manageable(dev)) return true; /* - * Look for a special _DSD property for the root port and if it - * is set we know the hierarchy behind it supports D3 just fine. + * The ACPI firmware will provide the device-specific properties through + * _DSD configuration object. Look for the 'HotPlugSupportInD3' property + * for the root port and if it is set we know the hierarchy behind it + * supports D3 just fine. */ - root = pcie_find_root_port(dev); - if (!root) + rpdev = pcie_find_root_port(dev); + if (!rpdev) return false; - adev = ACPI_COMPANION(&root->dev); - if (root == dev) { - /* - * It is possible that the ACPI companion is not yet bound - * for the root port so look it up manually here. - */ - if (!adev && !pci_dev_is_added(root)) - adev = acpi_pci_find_companion(&root->dev); - } - + adev = ACPI_COMPANION(&rpdev->dev); if (!adev) return false; - fwnode = acpi_fwnode_handle(adev); - if (fwnode_property_read_u8(fwnode, "HotPlugSupportInD3", &val)) + if (acpi_dev_get_property(adev, "HotPlugSupportInD3", + ACPI_TYPE_INTEGER, &obj) < 0) return false; - return val == 1; -} - -static bool acpi_pci_power_manageable(struct pci_dev *dev) -{ - struct acpi_device *adev = ACPI_COMPANION(&dev->dev); - return adev ? acpi_device_power_manageable(adev) : false; + return obj->integer.value == 1; } static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 379e85037..15a6975d3 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1789,6 +1789,9 @@ int pci_setup_device(struct pci_dev *dev) dev->error_state = pci_channel_io_normal; set_pcie_port_type(dev); + pci_set_of_node(dev); + pci_set_acpi_fwnode(dev); + pci_dev_assign_slot(dev); /* @@ -1924,6 +1927,7 @@ int pci_setup_device(struct pci_dev *dev) default: /* unknown header */ pci_err(dev, "unknown header type %02x, ignoring device\n", dev->hdr_type); + pci_release_of_node(dev); return -EIO; bad: @@ -2351,10 +2355,7 @@ static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn) dev->vendor = l & 0xffff; dev->device = (l >> 16) & 0xffff; - pci_set_of_node(dev); - if (pci_setup_device(dev)) { - pci_release_of_node(dev); pci_bus_put(dev->bus); kfree(dev); return NULL; -- 2.32.0