PCI: cadence: Remove duplicate message code definitions

The Cadence PCIe controller driver defines message codes in enum
cdns_pcie_msg_code duplicating the existing PCIE_MSG_CODE_* definitions in
drivers/pci/pci.h. The driver only uses ASSERT_INTA and DEASSERT_INTA codes
from this enum.

Remove the redundant Cadence-specific enum definitions and use the ones
available in drivers/pci/pci.h. This helps in avoiding code duplication,
maintaining consistency with the spec, and simplifying the code
maintenance.

Signed-off-by: Hans Zhang <[email protected]>
[mani: commit message rewording]
Signed-off-by: Manivannan Sadhasivam <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: Hans Zhang

drivers/pci/controller/cadence/pcie-cadence-ep.c

@@ -12,6 +12,7 @@
 #include <linux/sizes.h>
 
 #include "pcie-cadence.h"
+#include "../../pci.h"
 
 #define CDNS_PCIE_EP_MIN_APERTURE		128	/* 128 bytes */
 #define CDNS_PCIE_EP_IRQ_PCI_ADDR_NONE		0x1
@@ -337,10 +338,10 @@ static void cdns_pcie_ep_assert_intx(struct cdns_pcie_ep *ep, u8 fn, u8 intx,
 
 	if (is_asserted) {
 		ep->irq_pending |= BIT(intx);
-		msg_code = MSG_CODE_ASSERT_INTA + intx;
+		msg_code = PCIE_MSG_CODE_ASSERT_INTA + intx;
 	} else {
 		ep->irq_pending &= ~BIT(intx);
-		msg_code = MSG_CODE_DEASSERT_INTA + intx;
+		msg_code = PCIE_MSG_CODE_DEASSERT_INTA + intx;
 	}
 
 	spin_lock_irqsave(&ep->lock, flags);

drivers/pci/controller/cadence/pcie-cadence.h

@@ -250,17 +250,6 @@ struct cdns_pcie_rp_ib_bar {
 
 struct cdns_pcie;
 
-enum cdns_pcie_msg_code {
-	MSG_CODE_ASSERT_INTA	= 0x20,
-	MSG_CODE_ASSERT_INTB	= 0x21,
-	MSG_CODE_ASSERT_INTC	= 0x22,
-	MSG_CODE_ASSERT_INTD	= 0x23,
-	MSG_CODE_DEASSERT_INTA	= 0x24,
-	MSG_CODE_DEASSERT_INTB	= 0x25,
-	MSG_CODE_DEASSERT_INTC	= 0x26,
-	MSG_CODE_DEASSERT_INTD	= 0x27,
-};
-
 enum cdns_pcie_msg_routing {
 	/* Route to Root Complex */
 	MSG_ROUTING_TO_RC,