From: Tinh Nguyen <tinhngu...@os.amperecomputing.com>
Add PCIe link retry logic. If the card is detected to be present,
allow a retry for 3 times.
When the link is down, check if the LTSSMEN bit is cleared.
Based on Altra PCIe IP, the LTSSMEN bit is cleared from 1 to 0
if there is a surprising link down.
This indicates that a card is present.
Signed-off-by: Minh Nguyen <minhnguy...@os.amperecomputing.com>
---
Silicon/Ampere/AmpereAltraPkg/Library/Ac01PcieLib/PcieCore.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/Silicon/Ampere/AmpereAltraPkg/Library/Ac01PcieLib/PcieCore.c
b/Silicon/Ampere/AmpereAltraPkg/Library/Ac01PcieLib/PcieCore.c
index d797442d9fbc..9cc059788581 100644
--- a/Silicon/Ampere/AmpereAltraPkg/Library/Ac01PcieLib/PcieCore.c
+++ b/Silicon/Ampere/AmpereAltraPkg/Library/Ac01PcieLib/PcieCore.c
@@ -1769,7 +1769,11 @@ Ac01PcieCoreUpdateLink (
} else {
FailedPciePtr[*FailedPcieCount] = PcieIndex;
*FailedPcieCount += 1;
- *IsNextRoundNeeded = !(*IsNextRoundNeeded) ?
Ac01PcieCoreCheckCardPresent (Pcie) : TRUE;
+
+ if (Ac01PcieCoreCheckCardPresent (Pcie)) {
+ *IsNextRoundNeeded = TRUE;
+ DEBUG ((DEBUG_INFO, "PCIE%d.%d Link retry\n", RootComplex->ID,
PcieIndex));
+ }
}
}
}
--
2.39.0
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