diff --git a/common/tigerlake/xelpd/hw-gfx-gma-power_domains.adb b/common/tigerlake/xelpd/hw-gfx-gma-power_domains.adb
new file mode 100644
index 0000000..878f6f5
--- /dev/null
+++ b/common/tigerlake/xelpd/hw-gfx-gma-power_domains.adb
@@ -0,0 +1,99 @@
+--
+-- Copyright (C) 2022 Google, LLC
+--
+-- This program is free software; you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation; either version 2 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+
+with GNAT.Source_Info;
+with HW.Debug;
+with HW.GFX.GMA.Config_Helpers;
+with HW.GFX.GMA.Connectors.TC.Ownership;
+with HW.GFX.GMA.Power_Domains_Common;
+use HW.GFX.GMA.Power_Domains_Common;
+
+package body HW.GFX.GMA.Power_Domains is
+
+   function Need_PW (PW : Dynamic_Well; Configs : Pipe_Configs) return Boolean
+   is
+      function Any_PW2_Combo_Port return Boolean is
+        (for some Pipe in Pipe_Index =>
+            Configs (Pipe).Port /= Disabled and then
+            Config_Helpers.To_GPU_Port (Pipe, Configs (Pipe).Port) in DIGI_C .. DIGI_E);
+
+      function Any_TC_Port return Boolean is
+        (for some Pipe in Pipe_Index =>
+            Configs (Pipe).Port /= Disabled and then
+            Config_Helpers.To_GPU_Port (Pipe, Configs (Pipe).Port) in USBC_Port);
+
+      function Any_Pipe_From (First : Pipe_Index) return Boolean is
+        (for some Pipe in First .. Pipe_Index'Last => Configs (Pipe).Port /= Disabled);
+
+      function VGA return Boolean is
+        (Configs (Primary).Framebuffer.Offset = VGA_PLANE_FRAMEBUFFER_OFFSET);
+   begin
+      case PW is
+         when PW2 =>
+            return Any_Pipe_From (Secondary) or Any_PW2_Combo_Port or Any_TC_Port or VGA;
+         when PWA =>
+            return Configs (Primary).Port /= Disabled;
+         when PWB =>
+            return Configs (Secondary).Port /= Disabled;
+         when PWC =>
+            return Configs (Tertiary).Port /= Disabled;
+         when PWD =>
+            return False;  -- Fourth pipe not supported yet.
+      end case;
+   end Need_PW;
+
+   procedure Power_Up (Port : Active_Port_Type; Success : out Boolean)
+   is
+      GPU_Port : constant GMA.GPU_Port :=
+         Config_Helpers.To_GPU_Port (Pipe_Index'First, Port);
+
+      procedure On (Aux : AUX_Domain; DDI : DDI_Domain) is
+      begin
+         PD_On (PW1);
+         if DDI in DDI_PW2_Domain then
+            PD_On (PW2);
+         end if;
+         PD_On (DDI);
+
+         if GPU_Port in USBC_Port then
+            Connectors.TC.Ownership.Claim
+              (Port     => GPU_Port,
+               DP_Alt   => Port in Physical_USBC_Ports,
+               Success  => Success);
+            if not Success then
+               return;
+            end if;
+         end if;
+         PD_On (Aux);
+
+         Success := True;
+      end On;
+   begin
+      pragma Debug (Debug.Put_Line (GNAT.Source_Info.Enclosing_Entity));
+
+      case GPU_Port is
+         when GMA.DIGI_A   => On (AUX_A, DDI_A);
+         when GMA.DIGI_B   => On (AUX_B, DDI_B);
+         when GMA.DIGI_C   => On (AUX_C, DDI_C);
+         when GMA.DIGI_D   => On (AUX_D, DDI_D);
+         when GMA.DIGI_E   => On (AUX_E, DDI_E);
+         when GMA.DDI_TC1  => On (AUX_USBC1, DDI_USBC1);
+         when GMA.DDI_TC2  => On (AUX_USBC2, DDI_USBC2);
+         when GMA.DDI_TC3  => On (AUX_USBC3, DDI_USBC3);
+         when GMA.DDI_TC4  => On (AUX_USBC4, DDI_USBC4);
+         when others       => Success := True;
+      end case;
+   end Power_Up;
+
+end HW.GFX.GMA.Power_Domains;