New patch to review for coreboot: nb/amd/amdmct/mct_ddr3: Ensure BlockRxDqsLock does not remain set

[Timothy Pearson]

Timothy Pearson ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/14144

-gerrit

commit 37a93eb7576a76f070501bda8c1ca646b8d6ee3c
Author: Timothy Pearson 
Date:   Sun Mar 20 14:21:53 2016 -0500

nb/amd/amdmct/mct_ddr3: Ensure BlockRxDqsLock does not remain set

Under certain conditions (training abort) BlockRxDqsLock could
    remain set in violation of the BKDG.  Ensure BlockRxDqsLock is
    reset to 0 after a lane training abort.

Change-Id: I1a49a24d02b2b7cacae074794ec274a424a9e66b
---
 src/northbridge/amd/amdmct/mct_ddr3/mctdqs_d.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/northbridge/amd/amdmct/mct_ddr3/mctdqs_d.c b/src/northbridge/amd/amdmct/mct_ddr3/mctdqs_d.c
index 15b5ea4..5697a6e 100644
--- a/src/northbridge/amd/amdmct/mct_ddr3/mctdqs_d.c
+++ b/src/northbridge/amd/amdmct/mct_ddr3/mctdqs_d.c
@@ -1725,6 +1725,11 @@ static void TrainDQSReceiverEnCyc_D_Fam15(struct MCTStatStruc *pMCTstat,
    						"Training for receiver %d on DCT %d aborted\n",
    						__func__, lane, Receiver, dct);
    				}
+
+					/* Restore BlockRxDqsLock to normal operation */
+					dword = Get_NB32_index_wait_DCT(dev, dct, index_reg, 0x0d0f0030 | (lane << 8));
+					dword &= ~(0x1 << 8);								/* BlockRxDqsLock = 0 */
+					Set_NB32_index_wait_DCT(dev, dct, index_reg, 0x0d0f0030 | (lane << 8), dword);
    				break;
    			}