IPL/Stop: Assert ABIST_SRAM_MODE_DC to support ABIST Recovery

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>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/36731
Reviewed-by: Hostboot Team <hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

src/import/chips/p9/procedures/hwp/core/p9_hcd_core_stopclocks.C

@@ -220,6 +220,10 @@ p9_hcd_core_stopclocks(
     FAPI_DBG("Assert skew sense to skew adjust fence via NET_CTRL0[22]");
     FAPI_TRY(putScom(i_target, C_NET_CTRL0_WOR, MASK_SET(22)));
 
+    FAPI_DBG("Drop ABIST_SRAM_MODE_DC to support ABIST Recovery via BIST[1]");
+    FAPI_TRY(getScom(i_target, C_BIST, l_data64));
+    FAPI_TRY(putScom(i_target, C_BIST, DATA_UNSET(1)));
+
     FAPI_DBG("Assert vital fence via CPLT_CTRL1[3]");
     FAPI_TRY(putScom(i_target, C_CPLT_CTRL1_OR, MASK_SET(3)));