Data Type of ATTR_DPO_MIN_FREQ_PERCENT should be int32_t

ATTR_DPO_MIN_FREQ_PERCENT is always a negative value, so it should be
int32_t type, instead of uint32_t.
Make corresponding changes to DPO frequency calculation.

Change-Id: I97d608d71a39b010b60b94bb740ba9fa9df7f17b
CQ: SW390623
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/41337
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Reviewed-by: Corey V. Swenson <cswenson@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Reviewed-by: Christopher J. Cain <cjcain@us.ibm.com>
Reviewed-by: Matthew A. Ploetz <maploetz@us.ibm.com>

Author: mgloff

src/usr/isteps/istep06/call_host_voltage_config.C

@@ -415,13 +415,15 @@ void* call_host_voltage_config( void *io_pArgs )
         l_sys->setAttr<ATTR_NOMINAL_FREQ_MHZ>( l_nominalFreq );
 
         // raise the min freq if there is a system policy for it
-        uint32_t l_dpoPercent = l_sys->getAttr<ATTR_DPO_MIN_FREQ_PERCENT>();
+        int32_t l_dpoPercent = l_sys->getAttr<ATTR_DPO_MIN_FREQ_PERCENT>();
         uint32_t l_dpoFreq = l_nominalFreq;
-        if( (l_dpoPercent != 0) && (l_dpoPercent < 100) )
+        if( (l_dpoPercent != 0) && (l_dpoPercent > -100) )
         {
-            l_dpoFreq = (l_nominalFreq*l_dpoPercent)/100;
+            uint32_t l_multiplierPercent =
+                static_cast<uint32_t>(100 + l_dpoPercent);
+            l_dpoFreq = (l_nominalFreq*l_multiplierPercent)/100;
             TRACFCOMP(ISTEPS_TRACE::g_trac_isteps_trace,
-                      "Computed floor=%d, DPO=%d (percent=-%d)",
+                      "Computed floor=%d, DPO=%d (percent=%d)",
                       l_floorFreq, l_dpoFreq, l_dpoPercent );
             l_floorFreq = std::max( l_floorFreq, l_dpoFreq );
         }

src/usr/targeting/common/xmltohb/attribute_types.xml

@@ -2657,13 +2657,13 @@
         is used to explicitly raise the value of MIN_FREQ_MHZ above
         what is specified by MVPD #V data.  On FSP systems this
         is sourced from the power_management def file.
-        Value must be between 0 and 100.
+        Value must be between 0 and -100.
         A value of zero indicates no override.
     </description>
     <simpleType>
-        <uint32_t>
+        <int32_t>
             <default>0</default>
-        </uint32_t>
+        </int32_t>
     </simpleType>
     <persistency>non-volatile</persistency>
     <readable/>

src/usr/targeting/common/xmltohb/simics_NIMBUS.system.xml

@@ -99,7 +99,7 @@
     </attribute>
     <attribute>
         <id>DPO_MIN_FREQ_PERCENT</id>
-        <default>98</default>
+        <default>-2</default>
     </attribute>
     <attribute>
         <id>REQUIRED_SYNCH_MODE</id>