diff --git a/src/arch/x86/include/arch/pci_io_cfg.h b/src/arch/x86/include/arch/pci_io_cfg.h
index d02e6404d2..3e2129fa1a 100644
--- a/src/arch/x86/include/arch/pci_io_cfg.h
+++ b/src/arch/x86/include/arch/pci_io_cfg.h
@@ -78,43 +78,48 @@ void pci_io_write_config32(pci_devfn_t dev, unsigned int where, uint32_t value)
 }
 
 #if !IS_ENABLED(CONFIG_MMCONF_SUPPORT)
-#ifdef __SIMPLE_DEVICE__
+
+/* Avoid name collisions as different stages have different signature
+ * for these functions. The _s_ stands for simple, fundamental IO or
+ * MMIO variant.
+ */
+
 static __always_inline
-uint8_t pci_read_config8(pci_devfn_t dev, unsigned int where)
+uint8_t pci_s_read_config8(pci_devfn_t dev, unsigned int where)
 {
 	return pci_io_read_config8(dev, where);
 }
 
 static __always_inline
-uint16_t pci_read_config16(pci_devfn_t dev, unsigned int where)
+uint16_t pci_s_read_config16(pci_devfn_t dev, unsigned int where)
 {
 	return pci_io_read_config16(dev, where);
 }
 
 static __always_inline
-uint32_t pci_read_config32(pci_devfn_t dev, unsigned int where)
+uint32_t pci_s_read_config32(pci_devfn_t dev, unsigned int where)
 {
 	return pci_io_read_config32(dev, where);
 }
 
 static __always_inline
-void pci_write_config8(pci_devfn_t dev, unsigned int where, uint8_t value)
+void pci_s_write_config8(pci_devfn_t dev, unsigned int where, uint8_t value)
 {
 	pci_io_write_config8(dev, where, value);
 }
 
 static __always_inline
-void pci_write_config16(pci_devfn_t dev, unsigned int where, uint16_t value)
+void pci_s_write_config16(pci_devfn_t dev, unsigned int where, uint16_t value)
 {
 	pci_io_write_config16(dev, where, value);
 }
 
 static __always_inline
-void pci_write_config32(pci_devfn_t dev, unsigned int where, uint32_t value)
+void pci_s_write_config32(pci_devfn_t dev, unsigned int where, uint32_t value)
 {
 	pci_io_write_config32(dev, where, value);
 }
-#endif /* __SIMPLE_DEVICE__ */
+
 #endif
 
 #endif /* _PCI_IO_CFG_H */
diff --git a/src/include/device/pci_mmio_cfg.h b/src/include/device/pci_mmio_cfg.h
index 0545001102..d7ada4d84e 100644
--- a/src/include/device/pci_mmio_cfg.h
+++ b/src/include/device/pci_mmio_cfg.h
@@ -72,43 +72,46 @@ void pci_mmio_write_config32(pci_devfn_t dev, unsigned int where, u32 value)
 
 #if IS_ENABLED(CONFIG_MMCONF_SUPPORT)
 
-#ifdef __SIMPLE_DEVICE__
+/* Avoid name collisions as different stages have different signature
+ * for these functions. The _s_ stands for simple, fundamental IO or
+ * MMIO variant.
+ */
+
 static __always_inline
-uint8_t pci_read_config8(pci_devfn_t dev, unsigned int where)
+uint8_t pci_s_read_config8(pci_devfn_t dev, unsigned int where)
 {
 	return pci_mmio_read_config8(dev, where);
 }
 
 static __always_inline
-uint16_t pci_read_config16(pci_devfn_t dev, unsigned int where)
+uint16_t pci_s_read_config16(pci_devfn_t dev, unsigned int where)
 {
 	return pci_mmio_read_config16(dev, where);
 }
 
 static __always_inline
-uint32_t pci_read_config32(pci_devfn_t dev, unsigned int where)
+uint32_t pci_s_read_config32(pci_devfn_t dev, unsigned int where)
 {
 	return pci_mmio_read_config32(dev, where);
 }
 
 static __always_inline
-void pci_write_config8(pci_devfn_t dev, unsigned int where, uint8_t value)
+void pci_s_write_config8(pci_devfn_t dev, unsigned int where, uint8_t value)
 {
 	pci_mmio_write_config8(dev, where, value);
 }
 
 static __always_inline
-void pci_write_config16(pci_devfn_t dev, unsigned int where, uint16_t value)
+void pci_s_write_config16(pci_devfn_t dev, unsigned int where, uint16_t value)
 {
 	pci_mmio_write_config16(dev, where, value);
 }
 
 static __always_inline
-void pci_write_config32(pci_devfn_t dev, unsigned int where, uint32_t value)
+void pci_s_write_config32(pci_devfn_t dev, unsigned int where, uint32_t value)
 {
 	pci_mmio_write_config32(dev, where, value);
 }
-#endif /* __SIMPLE_DEVICE__ */
 
 #endif
 
diff --git a/src/include/device/pci_ops.h b/src/include/device/pci_ops.h
index 1cf5b77bf7..6bcb3e95b1 100644
--- a/src/include/device/pci_ops.h
+++ b/src/include/device/pci_ops.h
@@ -5,7 +5,19 @@
 #include <device/device.h>
 #include <arch/pci_ops.h>
 
-#ifndef __SIMPLE_DEVICE__
+#ifdef __SIMPLE_DEVICE__
+
+/* Avoid name collisions as different stages have different signature
+ * for these functions. The _s_ stands for simple, fundamental IO or
+ * MMIO variant.
+ */
+#define pci_read_config8 pci_s_read_config8
+#define pci_read_config16 pci_s_read_config16
+#define pci_read_config32 pci_s_read_config32
+#define pci_write_config8 pci_s_write_config8
+#define pci_write_config16 pci_s_write_config16
+#define pci_write_config32 pci_s_write_config32
+#else
 u8 pci_read_config8(struct device *dev, unsigned int where);
 u16 pci_read_config16(struct device *dev, unsigned int where);
 u32 pci_read_config32(struct device *dev, unsigned int where);