[PATCH 3/4] DynamicTablesPkg: AcpiSsdtPcieLibArm: Support UID > 0xF

["Jeff Brasen" <jbrasen@nvidia.com>]

Add support for PCIe devices with UID > 0xF.
This is done by using the next value in the name so
PCI5, PC26, etc

Signed-off-by: Jeff Brasen <jbrasen@nvidia.com>
---
 .../Acpi/Arm/AcpiSsdtPcieLibArm/SsdtPcieGenerator.c   | 11 +++++++----
 .../Acpi/Arm/AcpiSsdtPcieLibArm/SsdtPcieGenerator.h   |  2 +-
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtPcieLibArm/SsdtPcieGenerator.c b/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtPcieLibArm/SsdtPcieGenerator.c
index 85782af380..c5b23d91d0 100644
--- a/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtPcieLibArm/SsdtPcieGenerator.c
+++ b/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtPcieLibArm/SsdtPcieGenerator.c
@@ -818,7 +818,10 @@ GeneratePciDevice (
 
   // Write the name of the PCI device.
   CopyMem (AslName, "PCIx", AML_NAME_SEG_SIZE + 1);
-  AslName[AML_NAME_SEG_SIZE - 1] = AsciiFromHex (Uid);
+  AslName[AML_NAME_SEG_SIZE - 1] = AsciiFromHex (Uid & 0xF);
+  if (Uid > 0xF) {
+    AslName[AML_NAME_SEG_SIZE - 2] = AsciiFromHex ((Uid >> 4) & 0xF);
+  }
 
   // ASL: Device (PCIx) {}
   Status = AmlCodeGenDevice (AslName, ScopeNode, &PciNode);
@@ -1054,13 +1057,13 @@ BuildSsdtPciTableEx (
   for (Index = 0; Index < PciCount; Index++) {
     if (PcdGetBool (PcdPciUseSegmentAsUid)) {
       Uid = PciInfo[Index].PciSegmentGroupNumber;
-      if (Uid > MAX_PCI_ROOT_COMPLEXES_SUPPORTED) {
+      if (Uid >= MAX_PCI_ROOT_COMPLEXES_SUPPORTED) {
         DEBUG ((
           DEBUG_ERROR,
           "ERROR: SSDT-PCI: Pci root complexes segment number: %d."
-          " Greater than maximum number of Pci root complexes supported = %d.\n",
+          " Greater than maximum supported value = %d.\n",
           Uid,
-          MAX_PCI_ROOT_COMPLEXES_SUPPORTED
+          MAX_PCI_ROOT_COMPLEXES_SUPPORTED - 1
           ));
         return EFI_INVALID_PARAMETER;
       }
diff --git a/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtPcieLibArm/SsdtPcieGenerator.h b/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtPcieLibArm/SsdtPcieGenerator.h
index 59a0d601a3..515a3e1785 100644
--- a/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtPcieLibArm/SsdtPcieGenerator.h
+++ b/DynamicTablesPkg/Library/Acpi/Arm/AcpiSsdtPcieLibArm/SsdtPcieGenerator.h
@@ -31,7 +31,7 @@
         Corresponding changes would be needed to support the Name and
         UID fields describing the Pci root complexes.
 */
-#define MAX_PCI_ROOT_COMPLEXES_SUPPORTED  16
+#define MAX_PCI_ROOT_COMPLEXES_SUPPORTED  256
 
 // _SB scope of the AML namespace.
 #define SB_SCOPE  "\\_SB_"
-- 
2.25.1