soc/intel/alderlake: Inform user of memory training

If memory training is going to happen and early graphics is supported
by the mainboard, an on-screen text message is displayed to inform the
end user.

Memory training can take a while and an impatient end user facing a
black screen for a while may reset the device unnecessarily.

BUG=b:252792591
BRANCH=firmware-brya-14505.B
TEST=On screen text message during MRC training observed on skolas

Change-Id: I4ea15123eed1a4355c5ff7d815925032d4151de0
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70300
Reviewed-by: Tarun Tuli <taruntuli@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/alderlake/romstage/fsp_params.c

@@ -11,8 +11,10 @@
 #include <gpio.h>
 #include <intelbasecode/debug_feature.h>
 #include <intelblocks/cpulib.h>
+#include <intelblocks/early_graphics.h>
 #include <intelblocks/pcie_rp.h>
 #include <option.h>
+#include <pc80/vga.h>
 #include <soc/iomap.h>
 #include <soc/msr.h>
 #include <soc/pci_devs.h>
@@ -361,6 +363,16 @@ static void fill_fspm_ibecc_params(FSP_M_CONFIG *m_cfg,
 	}
 }
 
+static void inform_user_of_memory_training(void)
+{
+	if (!CONFIG(MAINBOARD_HAS_EARLY_LIBGFXINIT) ||
+	    !early_graphics_init())
+		return;
+
+	vga_write_text(VGA_TEXT_CENTER, VGA_TEXT_HORIZONTAL_MIDDLE,
+		       "Your device is finishing an update. This may take 1-2 minutes.\nPlease do not turn off your device.");
+}
+
 static void soc_memory_init_params(FSP_M_CONFIG *m_cfg,
 		const struct soc_intel_alderlake_config *config)
 {
@@ -415,6 +427,15 @@ void platform_fsp_memory_init_params_cb(FSPM_UPD *mupd, uint32_t version)
 			m_cfg->SerialDebugMrcLevel = 0;
 		}
 	}
+
+	/*
+	 * If valid MRC cache data is not found, FSP should perform a memory
+	 * training. Memory training can take a while so let's inform the end
+	 * user with an on-screen text message.
+	 */
+	if (!arch_upd->NvsBufferPtr)
+		inform_user_of_memory_training();
+
 	config = config_of_soc();
 
 	soc_memory_init_params(m_cfg, config);

src/soc/intel/alderlake/romstage/romstage.c

@@ -6,6 +6,7 @@
 #include <fsp/util.h>
 #include <intelblocks/cfg.h>
 #include <intelblocks/cse.h>
+#include <intelblocks/early_graphics.h>
 #include <intelblocks/pmclib.h>
 #include <intelblocks/smbus.h>
 #include <intelblocks/thermal.h>
@@ -172,4 +173,12 @@ void mainboard_romstage_entry(void)
 	pmc_set_disb();
 	if (!s3wake)
 		save_dimm_info();
+
+	/*
+	 * Turn-off early graphics configuration with two purposes:
+	 * - Clear any potentially still on-screen message
+	 * - Allow PEIM graphics driver to smoothly execute in ramstage if
+	 *   RUN_FSP_GOP is selected
+	 */
+	early_graphics_stop();
 }