[PATCH 1/3] pci: pcie_dw_rockchip: Fixed the below compilation error

[Anand Moon]

Use the Error values that may be returned by PCI functions
Added the error macro from linux/include/linux/pci.h

drivers/pci/pcie_dw_rockchip.c: In function 'rk_pcie_read':
drivers/pci/pcie_dw_rockchip.c:70:10: error: 'PCIBIOS_UNSUPPORTED'
                        undeclared (first use in this function)
   70 |   return PCIBIOS_UNSUPPORTED;
      |          ^~~~~~~~~~~~~~~~~~~
drivers/pci/pcie_dw_rockchip.c: In function 'rk_pcie_write':
drivers/pci/pcie_dw_rockchip.c:90:10: error: 'PCIBIOS_UNSUPPORTED'
                        undeclared (first use in this function)
   90 |   return PCIBIOS_UNSUPPORTED;
      |          ^~~~~~~~~~~~~~~~~~~

Cc: Neil Armstrong <narmstr...@baylibre.com>
Cc: Kever Yang <kever.y...@rock-chips.com>
Signed-off-by: Anand Moon <linux.am...@gmail.com>
---
 drivers/pci/pcie_dw_common.h   | 9 +++++++++
 drivers/pci/pcie_dw_rockchip.c | 4 ++--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/pcie_dw_common.h b/drivers/pci/pcie_dw_common.h
index 6b701645af..ba5feb5b51 100644
--- a/drivers/pci/pcie_dw_common.h
+++ b/drivers/pci/pcie_dw_common.h
@@ -90,6 +90,15 @@
 #define PCIE_MISC_CONTROL_1_OFF                0x8bc
 #define PCIE_DBI_RO_WR_EN              BIT(0)
 
+/* Error values that may be returned by PCI functions */
+#define PCIBIOS_SUCCESSFUL              0x00
+#define PCIBIOS_FUNC_NOT_SUPPORTED      0x81
+#define PCIBIOS_BAD_VENDOR_ID           0x83
+#define PCIBIOS_DEVICE_NOT_FOUND        0x86
+#define PCIBIOS_BAD_REGISTER_NUMBER     0x87
+#define PCIBIOS_SET_FAILED              0x88
+#define PCIBIOS_BUFFER_TOO_SMALL        0x89
+
 /* Parameters for the waiting for iATU enabled routine */
 #define LINK_WAIT_MAX_IATU_RETRIES     5
 #define LINK_WAIT_IATU                 10000
diff --git a/drivers/pci/pcie_dw_rockchip.c b/drivers/pci/pcie_dw_rockchip.c
index bc22af4230..9702b40019 100644
--- a/drivers/pci/pcie_dw_rockchip.c
+++ b/drivers/pci/pcie_dw_rockchip.c
@@ -67,7 +67,7 @@ static int rk_pcie_read(void __iomem *addr, int size, u32 
*val)
 {
        if ((uintptr_t)addr & (size - 1)) {
                *val = 0;
-               return PCIBIOS_UNSUPPORTED;
+               return PCIBIOS_BAD_REGISTER_NUMBER;
        }
 
        if (size == 4) {
@@ -87,7 +87,7 @@ static int rk_pcie_read(void __iomem *addr, int size, u32 
*val)
 static int rk_pcie_write(void __iomem *addr, int size, u32 val)
 {
        if ((uintptr_t)addr & (size - 1))
-               return PCIBIOS_UNSUPPORTED;
+               return PCIBIOS_BAD_REGISTER_NUMBER;
 
        if (size == 4)
                writel(val, addr);
-- 
2.31.1