linux-kernel - [PATCH RFC 17/25] PCI/LUO: Restore the no

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Message-Id: <20250728-luo-pci-v1-17-955b078dd653@kernel.org>
Date: Mon, 28 Jul 2025 01:24:47 -0700
From: chrisl@...nel.org
To: Bjorn Helgaas <bhelgaas@...gle.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, Danilo Krummrich <dakr@...nel.org>, 
 Len Brown <lenb@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, 
 linux-acpi@...r.kernel.org, David Matlack <dmatlack@...gle.com>, 
 Pasha Tatashin <tatashin@...gle.com>, Jason Miu <jasonmiu@...gle.com>, 
 Vipin Sharma <vipinsh@...gle.com>, Saeed Mahameed <saeedm@...dia.com>, 
 Adithya Jayachandran <ajayachandra@...dia.com>, 
 Parav Pandit <parav@...dia.com>, William Tu <witu@...dia.com>, 
 Mike Rapoport <rppt@...nel.org>, Chris Li <chrisl@...nel.org>, 
 Jason Gunthorpe <jgg@...pe.ca>, Leon Romanovsky <leon@...nel.org>
Subject: [PATCH RFC 17/25] PCI/LUO: Restore the no_d3cold flag

From: Jason Miu <jasonmiu@...gle.com>

When the PCI bus adds a device, restore the saved no_d3cold flag
before the bus does the D3 checking for the bridge. This tells the
bridge the current D3cold availability of the device.

Tested: QEMU VM boot test.

Signed-off-by: Chris Li <chrisl@...nel.org>
---
 drivers/pci/bus.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 69048869ef1c378454f86091ddb2b59a3c3d53ec..e9c7a6dc643d3534755e4ef5218fb6f90d5dcd65 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -353,6 +353,11 @@ void pci_bus_add_device(struct pci_dev *dev)
 		of_pci_make_dev_node(dev);
 	pci_create_sysfs_dev_files(dev);
 	pci_proc_attach_device(dev);
+	/*
+	 * Restore the no_d3cold flag for the device before we start to update
+	 * the D3 state for the bridge.
+	 */
+	dev->no_d3cold = PCI_SER_GET(dev, no_d3cold, dev->no_d3cold);
 	pci_bridge_d3_update(dev);

 	/*

-- 
2.50.1.487.gc89ff58d15-goog