bootmode: add display_init_required()

Some of the Chrome OS boards were directly calling vboot
called in some form after contorting around #ifdef preprocessor
macros. The reasoning is that Chrome OS doesn't always do display
initialization during startup. It's runtime dependent. While
this is a requirement that doesn't mean vboot functions should be
sprinkled around in the mainboard and chipset code. Instead provide
one function, display_init_required(), that provides the policy
for determining display initialization action. For Chrome OS
devices this function honors vboot_skip_display_init() and all
other configurations default to initializing display.

Change-Id: I403213e22c0e621e148773597a550addfbaf3f7e
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11490
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/soc/nvidia/tegra124/soc.c

@@ -20,13 +20,13 @@
  */
 
 #include <arch/io.h>
+#include <bootmode.h>
 #include <console/console.h>
 #include <device/device.h>
 #include <soc/nvidia/tegra/dc.h>
 #include <soc/display.h>
 #include <soc/sdram.h>
 #include <symbols.h>
-#include <vendorcode/google/chromeos/chromeos.h>
 
 #include "chip.h"
 
@@ -53,10 +53,10 @@ static void soc_enable(device_t dev)
 
 static void soc_init(device_t dev)
 {
-	if (vboot_skip_display_init())
-		printk(BIOS_INFO, "Skipping display init.\n");
-	else
+	if (display_init_required())
 		display_startup(dev);
+	else
+		printk(BIOS_INFO, "Skipping display init.\n");
 	printk(BIOS_INFO, "CPU: Tegra124\n");
 }
 

src/soc/nvidia/tegra132/soc.c

@@ -22,6 +22,7 @@
 #include <arch/cache.h>
 #include <arch/spintable.h>
 #include <cpu/cpu.h>
+#include <bootmode.h>
 #include <bootstate.h>
 #include <cbmem.h>
 #include <console/console.h>
@@ -34,7 +35,6 @@
 #include <soc/nvidia/tegra/apbmisc.h>
 #include <string.h>
 #include <timer.h>
-#include <vendorcode/google/chromeos/chromeos.h>
 
 #include "chip.h"
 
@@ -101,12 +101,13 @@ static void soc_init(device_t dev)
 	/* Lock down VPR */
 	lock_down_vpr();
 
-#if IS_ENABLED(CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT)
-	if (vboot_skip_display_init())
-		printk(BIOS_INFO, "Skipping display init.\n");
-	else
+	if (!IS_ENABLED(CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT))
+		return;
+
+	if (display_init_required())
 		display_startup(dev);
-#endif
+	else
+		printk(BIOS_INFO, "Skipping display init.\n");
 }
 
 static struct device_operations soc_ops = {

src/soc/nvidia/tegra210/soc.c

@@ -22,6 +22,7 @@
 #include <arch/cache.h>
 #include <arch/spintable.h>
 #include <cpu/cpu.h>
+#include <bootmode.h>
 #include <bootstate.h>
 #include <cbmem.h>
 #include <console/console.h>
@@ -35,7 +36,6 @@
 #include <soc/nvidia/tegra/apbmisc.h>
 #include <string.h>
 #include <timer.h>
-#include <vendorcode/google/chromeos/chromeos.h>
 #include <soc/sdram.h>
 #include <soc/sdram_configs.h>
 
@@ -92,12 +92,13 @@ static void soc_init(device_t dev)
 	spintable_init((void *)cfg->spintable_addr);
 	arch_initialize_cpus(dev, &cntrl_ops);
 
-#if IS_ENABLED(CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT)
-	if (vboot_skip_display_init())
-		printk(BIOS_INFO, "Skipping display init.\n");
-	else
+	if (!IS_ENABLED(CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT))
+		return;
+
+	if (display_init_required())
 		display_startup(dev);
-#endif
+	else
+		printk(BIOS_INFO, "Skipping display init.\n");
 }
 
 static void soc_noop(device_t dev)