mb/google/hatch/var/jinlon: Disable EPS on some SKUs

Disable EPS on the SKUs that do not have it.

Change-Id: I7305097beea3484634933ab856fd084933868a10
Signed-off-by: Rajat Jain <rajatja@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39156
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Mathew King <mathewk@chromium.org>

src/mainboard/google/hatch/variants/jinlon/Makefile.inc

@@ -25,4 +25,5 @@ SPD_SOURCES += 16G_3200_4bg   # 0b1001
 
 bootblock-y += gpio.c
 ramstage-y += gpio.c
+ramstage-y += mainboard.c
 ramstage-y += ramstage.c

src/mainboard/google/hatch/variants/jinlon/include/variant/sku.h

@@ -0,0 +1,23 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2020 Google LLC
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#ifndef __JINLON_SKU_H__
+#define __JINLON_SKU_H__
+
+/*
+ * SKU definition taken from
+ * https://buganizer.corp.google.com/issues/145688887#comment16
+ */
+enum {
+	JINLON_SKU_01 = 1,  /* No LTE, No view-angle-manegement */
+	JINLON_SKU_02 = 2,  /* No LTE, view-angle-manegement */
+	JINLON_SKU_21 = 21, /* LTE, No view-angle-manegement */
+	JINLON_SKU_22 = 22, /* LTE, view-angle-manegement */
+};
+
+#endif /* __JINLON_SKU_H__ */

src/mainboard/google/hatch/variants/jinlon/mainboard.c

@@ -0,0 +1,55 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2020 Google LLC
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include <baseboard/variants.h>
+#include <bootstate.h>
+#include <ec/google/chromeec/ec.h>
+#include <device/device.h>
+#include <drivers/gfx/generic/chip.h>
+#include <variant/sku.h>
+
+static bool eps_sku(uint32_t sku_id)
+{
+	/*
+	 * Assume EPS SKU by default, helpful for testing on
+	 * unprovisioned or development SKUs.
+	 */
+	if (sku_id == JINLON_SKU_01 || sku_id == JINLON_SKU_21)
+		return false;
+	else
+		return true;
+}
+
+static void check_for_eps(uint32_t sku_id)
+{
+	struct device *gfx_dev;
+
+	if (eps_sku(sku_id)) {
+		printk(BIOS_INFO, "SKU ID %u has EPS\n", sku_id);
+		return;
+	}
+
+	gfx_dev = find_gfx_dev();
+	if (!gfx_dev) {
+		printk(BIOS_ERR,
+		       "Error! No EPS dev, view-angle-management won't work\n");
+		return;
+	}
+
+	printk(BIOS_INFO,
+	       "SKU ID %u doesn't have EPS, disabling...\n",
+	       sku_id);
+	gfx_dev->enabled = 0;
+}
+
+void variant_devtree_update(void)
+{
+	uint32_t sku_id = google_chromeec_get_board_sku();
+
+	/* Disable EPS on SKUs that do not support it */
+	check_for_eps(sku_id);
+}