IPL/Stop: Assert ABIST_SRAM_MODE_DC to support ABIST Recovery

Change-Id: I00aaadb18a01594d4706e42bd06e375b995e7aa0
Original-Change-Id: I4465535c32e3cde8e8e2f0f3a13bb1d66d1f7614
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/36728
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Joachim Fenkes <fenkes@de.ibm.com>
Tested-by: PPE CI <ppe-ci+hostboot@us.ibm.com>
Reviewed-by: ASHISH A. MORE <ashish.more@in.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>

import/chips/p9/procedures/ppe_closed/cme/stop_cme/p9_cme_stop_entry.c

@@ -370,6 +370,11 @@ p9_cme_stop_entry()
         PK_TRACE("Assert skew sense to skewadjust fence via NET_CTRL0[22]");
         CME_PUTSCOM(CPPM_NC0INDIR_OR, core, BIT64(22));
 
+        PK_TRACE("Drop ABIST_SRAM_MODE_DC to support ABIST Recovery via BIST[1]");
+        CME_GETSCOM(C_BIST, core, CME_SCOM_AND, scom_data.value);
+        scom_data.words.upper &= ~BIT32(1);
+        CME_PUTSCOM(C_BIST, core, scom_data.value);
+
         PK_TRACE("Assert vital fence via CPLT_CTRL1[3]");
         CME_PUTSCOM(C_CPLT_CTRL1_OR, core, BIT64(3));