linux-kernel - [PATCH V7 3/4] PCI: Unify ACPI and DT 'preserve config' support

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Date: Wed, 8 May 2024 23:11:37 +0530
From: Vidya Sagar <vidyas@...dia.com>
To: <bhelgaas@...gle.com>, <rafael@...nel.org>, <lenb@...nel.org>,
	<will@...nel.org>, <lpieralisi@...nel.org>, <kw@...ux.com>,
	<robh@...nel.org>, <frowand.list@...il.com>
CC: <linux-pci@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>, <treding@...dia.com>, <jonathanh@...dia.com>,
	<kthota@...dia.com>, <mmaddireddy@...dia.com>, <vidyas@...dia.com>,
	<sagar.tv@...il.com>
Subject: [PATCH V7 3/4] PCI: Unify ACPI and DT 'preserve config' support

Unify the 'preserve config' support across ACPI and device-tree
boot flows.

Signed-off-by: Vidya Sagar <vidyas@...dia.com>
---
 drivers/pci/probe.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index ee086d029450..2c232c22d6af 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -894,6 +894,9 @@ static bool pci_preserve_config(struct pci_host_bridge *host_bridge)
 	if (pci_acpi_preserve_config(host_bridge))
 		return true;
 
+	if (host_bridge->dev.parent && host_bridge->dev.parent->of_node)
+		return of_pci_preserve_config(host_bridge->dev.parent->of_node);
+
 	return false;
 }
 
-- 
2.25.1