[PATCH u-boot-pci] pci: iproc: Set all 24 bits of PCI class code

[Pali Rohár]

Register 0x43c in its low 24 bits contains PCI class code.

Update code to set all 24 bits of PCI class code and not only upper 16 bits
of PCI class code.

Use standard U-Boot macro (PCI_CLASS_BRIDGE_PCI << 8) for constructing all
24-bits of PCI class for PCI bridge Normal decode.

Signed-off-by: Pali Rohár <pali at kernel.org>

---
Roman helped me with this change and confirmed that class code is stored
really in bits [23:0] of custom register 0x43c (normally class code is
stored in bits [31:8] of pci register 0x08).
---
 drivers/pci/pcie_iproc.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/pcie_iproc.c b/drivers/pci/pcie_iproc.c
index be03dcbd97c0..fe68e417ae80 100644
--- a/drivers/pci/pcie_iproc.c
+++ b/drivers/pci/pcie_iproc.c
@@ -1127,15 +1127,14 @@ static int iproc_pcie_check_link(struct iproc_pcie *pcie)
 	u32 link_status, class;
 
 	pcie->link_is_active = false;
-	/* force class to PCI_CLASS_BRIDGE_PCI (0x0604) */
+	/* force class to PCI bridge Normal decode (0x060400) */
 #define PCI_BRIDGE_CTRL_REG_OFFSET      0x43c
-#define PCI_CLASS_BRIDGE_MASK           0xffff00
-#define PCI_CLASS_BRIDGE_SHIFT          8
+#define PCI_BRIDGE_CTRL_REG_CLASS_MASK  0xffffff
 	iproc_pci_raw_config_read32(pcie, 0,
 				    PCI_BRIDGE_CTRL_REG_OFFSET,
 				    4, &class);
-	class &= ~PCI_CLASS_BRIDGE_MASK;
-	class |= (PCI_CLASS_BRIDGE_PCI << PCI_CLASS_BRIDGE_SHIFT);
+	class &= ~PCI_BRIDGE_CTRL_REG_CLASS_MASK;
+	class |= (PCI_CLASS_BRIDGE_PCI << 8);
 	iproc_pci_raw_config_write32(pcie, 0,
 				     PCI_BRIDGE_CTRL_REG_OFFSET,
 				     4, class);
-- 
2.20.1