PM: p9_setup_evid steps voltage to avoid Fleetwood VRM limitations

- use the present value of ATTR_EXT_VRM_STEPSIZE (used by PGPE for Pstate
  movement) to step the the boot voltage setup during istep 8.  This attribute
  defaults to 50mV.
- Done only for rails attached via AVSBus

Key_Cronus_Test=PM_REGRESS

Change-Id: I63feb361323246c8b92f1e96dc41f8fc19bd0912
CQ: SW420343
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/55386
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: HWSV CI <hwsv-ci+hostboot@us.ibm.com>
Tested-by: PPE CI <ppe-ci+hostboot@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: Hostboot CI <hostboot-ci+hostboot@us.ibm.com>
Tested-by: Cronus HW CI <cronushw-ci+hostboot@us.ibm.com>
Reviewed-by: RANGANATHPRASAD G. BRAHMASAMUDRA <prasadbgr@in.ibm.com>
Reviewed-by: Brian T. Vanderpool <vanderp@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com>
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/55395
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/src/import/chips/p9/procedures/hwp/pm/p9_setup_evid.H b/src/import/chips/p9/procedures/hwp/pm/p9_setup_evid.H
index a73f44aab..838783a23 100644
--- a/src/import/chips/p9/procedures/hwp/pm/p9_setup_evid.H
+++ b/src/import/chips/p9/procedures/hwp/pm/p9_setup_evid.H
@@ -5,7 +5,7 @@
 /*                                                                        */
 /* OpenPOWER HostBoot Project                                             */
 /*                                                                        */
-/* Contributors Listed Below - COPYRIGHT 2016,2017                        */
+/* Contributors Listed Below - COPYRIGHT 2016,2018                        */
 /* [+] International Business Machines Corp.                              */
 /*                                                                        */
 /*                                                                        */
@@ -47,7 +47,7 @@ enum P9_SETUP_EVID_CONSTANTS
     BRIDGE_NUMBER = 1,
 
 // Default voltages if mailbox -> attributes are not setup
-    AVSBUS_VOLTAGE_WRITE_RETRY_COUNT = 5,
+    AVSBUS_RETRY_COUNT = 5,
     VDD_SETUP = 6,
     VDN_SETUP = 7,
     VCS_SETUP = 8,
@@ -114,6 +114,7 @@ extern "C"
 /// @param [in]  i_rail_select AVS bus rail select
 /// @param [in]  i_voltage_mv voltage value in mv
 /// @param [in]  i_evid_value EVID setup mode
+/// @param [in]  i_ext_vrm_step_size_mv Maximum VRM step size in mv
 //@return fapi::ReturnCode. FAPI2_RC_SUCCESS if success, else error code.
     fapi2::ReturnCode
     p9_setup_evid_voltageWrite(
@@ -121,9 +122,9 @@ extern "C"
         const uint8_t i_bus_num,
         const uint8_t i_rail_select,
         const uint32_t i_voltage_mv,
+        const uint32_t i_ext_vrm_step_size_mv,
         const P9_SETUP_EVID_CONSTANTS i_evid_value);
 
-
 } // extern C
 
 #endif  // __P9_SETUP_EVID_H__