Change in libgfxinit[master]: Add flag to set up GMCH Panel Fitter

[Arthur Heymans (Code Review)]

Arthur Heymans has uploaded this change for review. ( https://review.coreboot.org/25409

Change subject: Add flag to set up GMCH Panel Fitter
......................................................................

Add flag to set up GMCH Panel Fitter

Change-Id: I4949fbb5356bd244d3d6f3eec71847b6e683079a
Signed-off-by: Arthur Heymans 
---
M common/hw-gfx-gma-config.ads.template
M common/hw-gfx-gma-pipe_setup.adb
M common/hw-gfx-gma-registers.ads
3 files changed, 15 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/libgfxinit refs/changes/09/25409/1

diff --git a/common/hw-gfx-gma-config.ads.template b/common/hw-gfx-gma-config.ads.template
index 75e1481..ceac67b 100644
--- a/common/hw-gfx-gma-config.ads.template
+++ b/common/hw-gfx-gma-config.ads.template
@@ -58,6 +58,7 @@
    VGA_Plane_Workaround    : constant Boolean := CPU = Ivybridge;
    Has_GMCH_VGACNTRL       : constant Boolean := false;
    Has_GMCH_DP_Transcoder  : constant Boolean := false;
+   Has_GMCH_PFIT_CONTROL   : constant Boolean := false;

----- Panel power: -----
    Has_PP_Write_Protection : constant Boolean := CPU <= Ivybridge;
diff --git a/common/hw-gfx-gma-pipe_setup.adb b/common/hw-gfx-gma-pipe_setup.adb
index 8b02798..5328582 100644
--- a/common/hw-gfx-gma-pipe_setup.adb
+++ b/common/hw-gfx-gma-pipe_setup.adb
@@ -419,6 +419,16 @@
          Value    => Shift_Left (Word32 (Width), 16) or Word32 (Height));
    end Setup_Ironlake_Panel_Fitter;

+   -- Simply set the pannel fitter to pipe A on which
+   -- the legacy VGA cycles are also displayed
+   procedure Setup_Gmch_Panel_Fitter
+   is
+   begin
+      Registers.Write
+	(Register => Registers.GMCH_PFIT_CONTROL,
+	 Value    => PF_CTRL_ENABLE);
+   end Setup_Gmch_Panel_Fitter;
+
    procedure Setup_Scaling
      (Controller  : in     Controller_Type;
       Mode        : in     HW.GFX.Mode_Type;
@@ -434,6 +444,8 @@
       then
          if Config.Has_Plane_Control then
             Setup_Skylake_Pipe_Scaler (Controller, Mode, Framebuffer);
+	 elsif Config.Has_GMCH_PFIT_CONTROL then
+	    Setup_Gmch_Panel_Fitter;
          else
             Setup_Ironlake_Panel_Fitter (Controller, Mode, Framebuffer);
          end if;
diff --git a/common/hw-gfx-gma-registers.ads b/common/hw-gfx-gma-registers.ads
index 468d79d..480ee32 100644
--- a/common/hw-gfx-gma-registers.ads
+++ b/common/hw-gfx-gma-registers.ads
@@ -160,6 +160,7 @@
       GMCH_PP_ON_DELAYS,
       GMCH_PP_OFF_DELAYS,
       GMCH_PP_DIVISOR,
+      GMCH_PFIT_CONTROL,
       PIPEB_DDI_FUNC_CTL,
       PIPEB_MSA_MISC,
       SRD_CTL_B,
@@ -1293,6 +1294,7 @@
       GMCH_PP_ON_DELAYS     => 16#06_1208# / Register_Width,
       GMCH_PP_OFF_DELAYS    => 16#06_120c# / Register_Width,
       GMCH_PP_DIVISOR       => 16#06_1210# / Register_Width,
+      GMCH_PFIT_CONTROL     => 16#06_1230# / Register_Width,
       PCH_PP_STATUS         => 16#0c_7200# / Register_Width,
       PCH_PP_CONTROL        => 16#0c_7204# / Register_Width,
       PCH_PP_ON_DELAYS      => 16#0c_7208# / Register_Width,