linux-kernel - [PATCH v10 3/5] PCI: move pci_clear_and_set

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Date:   Sat,  4 Nov 2023 21:32:14 +0800
From:   Shuai Xue <xueshuai@...ux.alibaba.com>
To:     kaishen@...ux.alibaba.com, helgaas@...nel.org,
        yangyicong@...wei.com, will@...nel.org,
        Jonathan.Cameron@...wei.com, baolin.wang@...ux.alibaba.com,
        robin.murphy@....com
Cc:     chengyou@...ux.alibaba.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
        rdunlap@...radead.org, mark.rutland@....com,
        zhuo.song@...ux.alibaba.com, xueshuai@...ux.alibaba.com,
        renyu.zj@...ux.alibaba.com
Subject: [PATCH v10 3/5] PCI: move pci_clear_and_set_dword helper to pci header

The clear and set pattern is commonly used for accessing pci config,
move the helper pci_clear_and_set_dword from aspm.c into pci header.

Signed-off-by: Shuai Xue <xueshuai@...ux.alibaba.com>
---
 drivers/pci/access.c    | 12 ++++++++++++
 drivers/pci/pcie/aspm.c | 11 -----------
 include/linux/pci.h     |  2 ++
 3 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 6554a2e89d36..526360481d99 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -598,3 +598,15 @@ int pci_write_config_dword(const struct pci_dev *dev, int where,
 	return pci_bus_write_config_dword(dev->bus, dev->devfn, where, val);
 }
 EXPORT_SYMBOL(pci_write_config_dword);
+
+void pci_clear_and_set_dword(const struct pci_dev *dev, int pos,
+				    u32 clear, u32 set)
+{
+	u32 val;
+
+	pci_read_config_dword(dev, pos, &val);
+	val &= ~clear;
+	val |= set;
+	pci_write_config_dword(dev, pos, val);
+}
+EXPORT_SYMBOL(pci_clear_and_set_dword);
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 1bf630059264..f4e64fedc048 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -423,17 +423,6 @@ static void pcie_aspm_check_latency(struct pci_dev *endpoint)
 	}
 }
 
-static void pci_clear_and_set_dword(struct pci_dev *pdev, int pos,
-				    u32 clear, u32 set)
-{
-	u32 val;
-
-	pci_read_config_dword(pdev, pos, &val);
-	val &= ~clear;
-	val |= set;
-	pci_write_config_dword(pdev, pos, val);
-}
-
 /* Calculate L1.2 PM substate timing parameters */
 static void aspm_calc_l12_info(struct pcie_link_state *link,
 				u32 parent_l1ss_cap, u32 child_l1ss_cap)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 8c7c2c3c6c65..271f30fd7ca4 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1213,6 +1213,8 @@ int pci_read_config_dword(const struct pci_dev *dev, int where, u32 *val);
 int pci_write_config_byte(const struct pci_dev *dev, int where, u8 val);
 int pci_write_config_word(const struct pci_dev *dev, int where, u16 val);
 int pci_write_config_dword(const struct pci_dev *dev, int where, u32 val);
+void pci_clear_and_set_dword(const struct pci_dev *dev, int pos,
+				    u32 clear, u32 set);
 
 int pcie_capability_read_word(struct pci_dev *dev, int pos, u16 *val);
 int pcie_capability_read_dword(struct pci_dev *dev, int pos, u32 *val);
-- 
2.39.3