[edk2-platforms][PATCH 2/3] AmpereAltraPkg: Fix PCIe link training sequence

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

Currently, the implementation starts link training and put device
out-of-reset right away. This make LinkStat and BlockEventStat registers
indicate that link is not up yet (LinkStat: 0x300 and BlockEventStat: 0x0).
This fix will start link training after putting device out-of-reset.
The values of LinkStat and BlockEventStat registers after this fix are
respectively 0x1103 and 0x1 (Link is up).

Signed-off-by: Minh Nguyen <minhnguyen1@os.amperecomputing.com>
---
 Silicon/Ampere/AmpereAltraPkg/Library/Ac01PcieLib/PcieCore.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Silicon/Ampere/AmpereAltraPkg/Library/Ac01PcieLib/PcieCore.c b/Silicon/Ampere/AmpereAltraPkg/Library/Ac01PcieLib/PcieCore.c
index f7c8defc1906..d797442d9fbc 100644
--- a/Silicon/Ampere/AmpereAltraPkg/Library/Ac01PcieLib/PcieCore.c
+++ b/Silicon/Ampere/AmpereAltraPkg/Library/Ac01PcieLib/PcieCore.c
@@ -1177,12 +1177,12 @@ Ac01PcieCoreSetupRC (
     // Assert PERST low to reset endpoint
     BoardPcieAssertPerst (RootComplex, PcieIndex, FALSE);
 
+    // Complete the PERST pulse
+    BoardPcieAssertPerst (RootComplex, PcieIndex, TRUE);
+
     // Start link training
     StartLinkTraining (RootComplex, PcieIndex, TRUE);
 
-    // Complete the PERST pulse
-    BoardPcieAssertPerst (RootComplex, PcieIndex, TRUE);
-
     // Lock programming of config space
     EnableDbiAccess  (RootComplex, PcieIndex, FALSE);
 
-- 
2.39.0