linux-kernel - [PATCH v4 1/2] PCI: Introduce pci_clear/set_config

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Message-Id: <20250818161431.372590-2-18255117159@163.com>
Date: Tue, 19 Aug 2025 00:14:30 +0800
From: Hans Zhang <18255117159@....com>
To: mahesh@...ux.ibm.com,
	bhelgaas@...gle.com
Cc: oohall@...il.com,
	mani@...nel.org,
	lukas@...ner.de,
	linuxppc-dev@...ts.ozlabs.org,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Hans Zhang <18255117159@....com>
Subject: [PATCH v4 1/2] PCI: Introduce pci_clear/set_config_dword()

Add helper functions to clear or set bits in PCI config space.
These helpers reduce code duplication and improve readability for config
space modifications by encapsulating common read-modify-write patterns.

Signed-off-by: Hans Zhang <18255117159@....com>
---
 include/linux/pci.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 59876de13860..bb0dba2b7aee 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1341,6 +1341,18 @@ static inline int pcie_capability_clear_dword(struct pci_dev *dev, int pos,
 	return pcie_capability_clear_and_set_dword(dev, pos, clear, 0);
 }
 
+static inline void pci_clear_config_dword(const struct pci_dev *dev, int pos,
+					  u32 clear)
+{
+	pci_clear_and_set_config_dword(dev, pos, clear, 0);
+}
+
+static inline void pci_set_config_dword(const struct pci_dev *dev, int pos,
+					u32 set)
+{
+	pci_clear_and_set_config_dword(dev, pos, 0, set);
+}
+
 /* User-space driven config access */
 int pci_user_read_config_byte(struct pci_dev *dev, int where, u8 *val);
 int pci_user_read_config_word(struct pci_dev *dev, int where, u16 *val);
-- 
2.25.1