drivers/intel/gma: Use libgfxinit Update_Output to turn off graphics

We were using the libgfxinit `Initialize' function with the
`Clean_State' parameter because the more appropriate `Update_Output'
function was not performing all the necessary clean up operations for
the PEIM driver to be successful when libgfxinit was used in romstage.

Thanks to a lot of experiments and some log analysis efforts, we were
able to identify the missing operation and fix the `Update_Output'
function (cf. https://review.coreboot.org/c/libgfxinit/+/72123).

The `initialized' global variable is now unnecessary as we track the
initialization in the Ada code instead.

Since the `Update_Output' function does not return any value, this
patch modifies the `gma_gfxstop' prototype accordingly. This does not
have any impact as the return value was not used anyway.

BUG=b:264526798
BRANCH=firmware-brya-14505.B
TEST=Developer screen is visible

Change-Id: I53d6fadf65dc09bd984de96edb4c1f15b64aeed0
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72125
Reviewed-by: Tarun Tuli <taruntuli@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>

src/drivers/intel/gma/gma-gfx_init.ads

@@ -11,7 +11,7 @@ is
    procedure gfxinit (lightup_ok : out Interfaces.C.int);
    pragma Export (C, gfxinit, "gma_gfxinit");
 
-   procedure gfxstop (stop_ok : out Interfaces.C.int);
+   procedure gfxstop;
    pragma Export (C, gfxstop, "gma_gfxstop");
 
    ----------------------------------------------------------------------------

src/drivers/intel/gma/hires_fb/gma-gfx_init.adb

@@ -18,6 +18,7 @@ with GMA.Mainboard;
 package body GMA.GFX_Init
 is
 
+   configs : Pipe_Configs;
    ----------------------------------------------------------------------------
 
    procedure gfxinit (lightup_ok : out Interfaces.C.int)
@@ -28,7 +29,6 @@ is
       use type Interfaces.C.size_t;
 
       ports : Port_List;
-      configs : Pipe_Configs;
 
       success : boolean;
 
@@ -97,16 +97,14 @@ is
       end if;
    end gfxinit;
 
-   procedure gfxstop (stop_ok : out Interfaces.C.int)
+   procedure gfxstop
    is
-      success : boolean;
    begin
-      HW.GFX.GMA.Initialize (Clean_State => True,
-			     Success => success);
-      if success then
-         stop_ok := 1;
-      else
-         stop_ok := 0;
+      if configs (Primary).Port /= Disabled then
+         for i in Pipe_Index loop
+            configs (i).Port := Disabled;
+         end loop;
+         HW.GFX.GMA.Update_Outputs (configs);
       end if;
    end gfxstop;
 

src/drivers/intel/gma/libgfxinit.h

@@ -17,7 +17,7 @@ enum {
 };
 
 void gma_gfxinit(int *lightup_ok);
-void gma_gfxstop(int *stop_ok);
+void gma_gfxstop(void);
 int gma_read_edid(unsigned char edid[], int port);
 
 #endif

src/drivers/intel/gma/text_fb/gma-gfx_init.adb

@@ -12,11 +12,11 @@ with GMA.Mainboard;
 
 package body GMA.GFX_Init
 is
+   configs : Pipe_Configs;
 
    procedure gfxinit (lightup_ok : out Interfaces.C.int)
    is
       ports : Port_List;
-      configs : Pipe_Configs;
 
       success : boolean;
 
@@ -56,16 +56,14 @@ is
       end if;
    end gfxinit;
 
-   procedure gfxstop (stop_ok : out Interfaces.C.int)
+   procedure gfxstop
    is
-      success : boolean;
    begin
-      HW.GFX.GMA.Initialize (Clean_State => True,
-			     Success => success);
-      if success then
-         stop_ok := 1;
-      else
-         stop_ok := 0;
+      if configs (Primary).Port /= Disabled then
+         for i in Pipe_Index loop
+            configs (i).Port := Disabled;
+         end loop;
+         HW.GFX.GMA.Update_Outputs (configs);
       end if;
    end gfxstop;
 

src/soc/intel/common/block/graphics/early_graphics.c

@@ -6,8 +6,6 @@
 #include <intelblocks/early_graphics.h>
 #include <soc/pci_devs.h>
 
-static bool initialized;
-
 static void device_init(void)
 {
 	/* Disable response in IO and MMIO space. */
@@ -37,19 +35,15 @@ bool early_graphics_init(void)
 	early_graphics_soc_panel_init();
 
 	gma_gfxinit(&ret);
-	initialized = !!ret;
-
-	return initialized;
+	return !!ret;
 }
 
 void early_graphics_stop(void)
 {
-	int ret;
-
-	if (!initialized)
+	if (!CONFIG(MAINBOARD_USE_EARLY_LIBGFXINIT))
 		return;
 
-	gma_gfxstop(&ret);
+	gma_gfxstop();
 
 	/*
 	 * Temporary workaround