[edk2-platforms][PATCH 3/6] AmpereAltraPkg: Change PCIe Amba Link Timeout value

[Minh Nguyen <minhnguyen1@os.amperecomputing.com>]

As AMBA_LINK_TIMEOUT_OFF spec, it impacts OS Hot Plug removal delay.
The greater value the longer delay it is. Per experiments, set it 2
from beginning of Root Port initialization for stable operation.

Signed-off-by: Minh Nguyen <minhnguyen1@os.amperecomputing.com>
---
 Silicon/Ampere/AmpereAltraPkg/Library/Ac01PcieLib/PcieCore.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Silicon/Ampere/AmpereAltraPkg/Library/Ac01PcieLib/PcieCore.c b/Silicon/Ampere/AmpereAltraPkg/Library/Ac01PcieLib/PcieCore.c
index c5a299cca6c5..d71f56d5fcf1 100644
--- a/Silicon/Ampere/AmpereAltraPkg/Library/Ac01PcieLib/PcieCore.c
+++ b/Silicon/Ampere/AmpereAltraPkg/Library/Ac01PcieLib/PcieCore.c
@@ -1159,8 +1159,12 @@ Ac01PcieCoreSetupRC (
       }
     }
 
-    // Link timeout after 1ms
-    SetLinkTimeout (RootComplex, PcieIndex, 1);
+    //
+    // As AMBA_LINK_TIMEOUT_OFF spec, it impacts OS HP removal delay.
+    // The greater value the longer delay it is. Per discussion,
+    // set it 2 from beginning of RP initialization.
+    //
+    SetLinkTimeout (RootComplex, PcieIndex, 2);
 
     DisableCompletionTimeOut (RootComplex, PcieIndex, TRUE);
 
-- 
2.39.0