intel_reg_dumper: Add dumping of GPU turbo regs.

I was interested in finding why my IVB system is not getting GPU turbo
after suspend/resume.  The piece that looks weird to me is that
INTERRUPT_THRESHOLD is sitting at 0, whereas pre-suspend it's
0x12000000.

tools/intel_reg_dumper.c

@@ -1826,6 +1826,23 @@ _intel_dump_regs(struct reg_debug *regs, int count)
 	}
 }
 
+DEBUGSTRING(gen6_rp_control)
+{
+	snprintf(result, len, "%s",
+		 (val & (1 << 7)) ? "enabled" : "disabled");
+}
+
+static struct reg_debug gen6_rp_debug_regs[] = {
+	DEFINEREG2(GEN6_RP_CONTROL, gen6_rp_control),
+	DEFINEREG(GEN6_RPNSWREQ),
+	DEFINEREG(GEN6_RP_DOWN_TIMEOUT),
+	DEFINEREG(GEN6_RP_INTERRUPT_LIMITS),
+	DEFINEREG(GEN6_RP_UP_THRESHOLD),
+	DEFINEREG(GEN6_RP_UP_EI),
+	DEFINEREG(GEN6_RP_DOWN_EI),
+	DEFINEREG(GEN6_RP_IDLE_HYSTERSIS),
+};
+
 static void
 intel_dump_other_regs(void)
 {
@@ -2097,5 +2114,8 @@ int main(int argc, char** argv)
 		intel_dump_other_regs();
 	}
 
+	if (IS_GEN6(devid) || IS_GEN7(devid))
+		intel_dump_regs(gen6_rp_debug_regs);
+
 	return 0;
 }