soc/intel/broadwell: Conditionally skip PRE_GRAPHICS_DELAY

It was commented that the need for the delay was mainly related
to external displays and only with VBIOS execution. Move the
delay such that it is done only when we actually need to execute
the VBIOS aka option rom.

A delay is currently only defined for librem/purism_bdw in
its Kconfig. As the description of the issue sounds like it
would equally happen on other platforms when VBIOS is involved,
promote the Kconfig visible option to global scope.

Change-Id: I4503158576f35057373f003586bbf76af4d59b3d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48787
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/device/Kconfig

@@ -117,6 +117,16 @@ config NO_GFX_INIT
 
 endchoice
 
+config PRE_GRAPHICS_DELAY
+	int "Graphics initialization delay in ms"
+	default 0
+	depends on VGA_ROM_RUN
+	help
+	  On some systems, coreboot boots so fast that connected monitors
+	  (mostly TVs) won't be able to wake up fast enough to talk to the
+	  VBIOS. On those systems we need to wait for a bit before executing
+	  the VBIOS.
+
 config ONBOARD_VGA_IS_PRIMARY
 	bool "Use onboard VGA as primary video device"
 	default n

src/device/pci_device.c

@@ -732,6 +732,12 @@ static int should_load_oprom(struct device *dev)
 	return 0;
 }
 
+static void oprom_pre_graphics_stall(void)
+{
+	if (CONFIG_PRE_GRAPHICS_DELAY)
+		mdelay(CONFIG_PRE_GRAPHICS_DELAY);
+}
+
 /** Default handler: only runs the relevant PCI BIOS. */
 void pci_dev_init(struct device *dev)
 {
@@ -760,6 +766,9 @@ void pci_dev_init(struct device *dev)
 	if (!should_run_oprom(dev, rom))
 		return;
 
+	/* Wait for any configured pre-graphics delay */
+	oprom_pre_graphics_stall();
+
 	run_bios(dev, (unsigned long)ram);
 
 	gfx_set_init_done(1);

src/northbridge/intel/haswell/Kconfig

@@ -90,15 +90,6 @@ config HASWELL_HIDE_PEG_FROM_MRC
 	  However, it prevents MRC from programming PEG AFE registers,
 	  which can make PEG devices unstable. When unsure, choose N.
 
-config PRE_GRAPHICS_DELAY
-	int "Graphics initialization delay in ms"
-	default 0
-	help
-	  On some systems, coreboot boots so fast that connected monitors
-	  (mostly TVs) won't be able to wake up fast enough to talk to the
-	  VBIOS. On those systems we need to wait for a bit before executing
-	  the VBIOS.
-
 # The UEFI System Agent binary needs to be at a fixed offset in the flash
 # and can therefore only reside in the COREBOOT fmap region
 config RO_REGION_ONLY

src/northbridge/intel/haswell/gma.c

@@ -444,7 +444,6 @@ static void gma_func0_init(struct device *dev)
 
 	if (!lightup_ok) {
 		printk(BIOS_SPEW, "FUI did not run; using VBIOS\n");
-		mdelay(CONFIG_PRE_GRAPHICS_DELAY);
 		pci_dev_init(dev);
 	}
 

src/soc/intel/broadwell/Kconfig

@@ -141,15 +141,6 @@ config RO_REGION_ONLY
 
 endif # HAVE_MRC
 
-config PRE_GRAPHICS_DELAY
-	int "Graphics initialization delay in ms"
-	default 0
-	help
-	  On some systems, coreboot boots so fast that connected monitors
-	  (mostly TVs) won't be able to wake up fast enough to talk to the
-	  VBIOS. On those systems we need to wait for a bit before executing
-	  the VBIOS.
-
 config INTEL_PCH_UART_CONSOLE
 	bool "Use Serial IO UART for console"
 	default n

src/soc/intel/broadwell/gma.c

@@ -513,12 +513,6 @@ static void igd_init(struct device *dev)
 	if (!CONFIG(NO_GFX_INIT))
 		pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_MASTER);
 
-	/* Wait for any configured pre-graphics delay */
-	if (!acpi_is_wakeup_s3()) {
-		if (!CONFIG(CHROMEOS) || display_init_required())
-			mdelay(CONFIG_PRE_GRAPHICS_DELAY);
-	}
-
 	/* Early init steps */
 	if (is_broadwell) {
 		reg_script_run_on_dev(dev, broadwell_early_init_script);