[PATCH V4 06/12] PCI/TPH: Add pcie_tph_enabled() to check TPH state

[Wei Huang <wei.huang2@xxxxxxx>]

Check if TPH has been enabled on a device.

Co-developed-by: Eric Van Tassell <Eric.VanTassell@xxxxxxx>
Signed-off-by: Eric Van Tassell <Eric.VanTassell@xxxxxxx>
Signed-off-by: Wei Huang <wei.huang2@xxxxxxx>
Reviewed-by: Ajit Khaparde <ajit.khaparde@xxxxxxxxxxxx>
Reviewed-by: Somnath Kotur <somnath.kotur@xxxxxxxxxxxx>
Reviewed-by: Andy Gospodarek <andrew.gospodarek@xxxxxxxxxxxx>
---
 drivers/pci/pcie/tph.c  | 12 ++++++++++++
 include/linux/pci-tph.h |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/drivers/pci/pcie/tph.c b/drivers/pci/pcie/tph.c
index 08ce4fdeb160..d949930e7e78 100644
--- a/drivers/pci/pcie/tph.c
+++ b/drivers/pci/pcie/tph.c
@@ -40,6 +40,18 @@ static u8 get_rp_completer_type(struct pci_dev *pdev)
 	return FIELD_GET(PCI_EXP_DEVCAP2_TPH_COMP_MASK, reg);
 }
 
+/**
+ * pcie_tph_enabled - Check whether TPH is enabled in device
+ * @pdev: PCI device
+ *
+ * Return: true if TPH is enabled, otherwise false
+ */
+bool pcie_tph_enabled(struct pci_dev *pdev)
+{
+	return pdev->tph_enabled;
+}
+EXPORT_SYMBOL(pcie_tph_enabled);
+
 /**
  * pcie_disable_tph - Turn off TPH support for device
  * @pdev: PCI device
diff --git a/include/linux/pci-tph.h b/include/linux/pci-tph.h
index 422d395ade68..50e05cdfbc43 100644
--- a/include/linux/pci-tph.h
+++ b/include/linux/pci-tph.h
@@ -10,10 +10,12 @@
 #define LINUX_PCI_TPH_H
 
 #ifdef CONFIG_PCIE_TPH
+bool pcie_tph_enabled(struct pci_dev *pdev);
 void pcie_disable_tph(struct pci_dev *pdev);
 int pcie_enable_tph(struct pci_dev *pdev, int mode);
 int pcie_tph_modes(struct pci_dev *pdev);
 #else
+static inline bool pcie_tph_enabled(struct pci_dev *pdev) { return false; }
 static inline void pcie_disable_tph(struct pci_dev *pdev) { }
 static inline int pcie_enable_tph(struct pci_dev *pdev, int mode)
 { return -EINVAL; }
-- 
2.45.1