mb/google/poppy/variant/atlas: Update PL2 based on CPU sku

This patch adds a function to overwrite PL2 setting based on CPU
sku. From doc #594883, PL2 is 18W for AML-Y.

BUG=b:110890675
BRANCH=None
TEST=emerge-atlas coreboot chromeos-bootimage & test with AML-Y
     and KBL-Y skus.

Change-Id: I468befcd2c4ad6c2bb9ae91b323a43f87ff65a26
Signed-off-by: Gaggery Tsai <gaggery.tsai@intel.com>
Reviewed-on: https://review.coreboot.org/27765
Reviewed-by: Caveh Jalali <caveh@google.com>
Reviewed-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

2 files changed, 46 insertions, 0 deletions

diff --git a/src/mainboard/google/poppy/variants/atlas/Makefile.inc b/src/mainboard/google/poppy/variants/atlas/Makefile.inc
index ad40bb04d6..06776ffd4a 100644
--- a/src/mainboard/google/poppy/variants/atlas/Makefile.inc
+++ b/src/mainboard/google/poppy/variants/atlas/Makefile.inc
@@ -19,3 +19,4 @@ romstage-y += memory.c
 
 ramstage-y += gpio.c
 ramstage-y += nhlt.c
+ramstage-y += mainboard.c
diff --git a/src/mainboard/google/poppy/variants/atlas/mainboard.c b/src/mainboard/google/poppy/variants/atlas/mainboard.c
new file mode 100644
index 0000000000..07a4e66c1f
--- /dev/null
+++ b/src/mainboard/google/poppy/variants/atlas/mainboard.c
@@ -0,0 +1,45 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 Google Inc.
+ * Copyright (C) 2018 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <baseboard/variants.h>
+#include <chip.h>
+#include <device/device.h>
+#include <device/pci_ids.h>
+#include <device/pci_ops.h>
+
+#define PL2_AML	18
+#define PL2_KBL	15
+
+static uint32_t get_pl2(void)
+{
+	uint16_t id;
+	id = pci_read_config16(SA_DEV_IGD, PCI_DEVICE_ID);
+	/* Assume we only have KLB-Y and AML-Y SKUs */
+	if (id == PCI_DEVICE_ID_INTEL_KBL_GT2_SULXM)
+		return PL2_KBL;
+
+	return PL2_AML;
+}
+
+/* Override dev tree settings per board */
+void variant_devtree_update(void)
+{
+	struct device *root = SA_DEV_ROOT;
+	config_t *cfg = root->chip_info;
+
+	/* Update PL2 based on CPU */
+	cfg->tdp_pl2_override = get_pl2();
+}