[S] Change in coreboot[main]: mb/trulo/var/uldrenite: Support x32 memory configuration

[John Su (Code Review)]

John Su has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/86364?usp=email )

Change subject: mb/trulo/var/uldrenite: Support x32 memory configuration
......................................................................

mb/trulo/var/uldrenite: Support x32 memory configuration

Use the GPP_E13 level to determine whether x32 memory configuration
is supported.

BUG=b:379311559
BRANCH=firmware-trulo-15217.771.B
TEST=emerge-nissa coreboot chromeos-bootimage

Change-Id: Idd3534bba0379a7bb06f8fbbeb9469e938e5a629
Signed-off-by: John Su 
---
M src/mainboard/google/brya/Kconfig
M src/mainboard/google/brya/variants/uldrenite/memory.c
2 files changed, 15 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/64/86364/1

diff --git a/src/mainboard/google/brya/Kconfig b/src/mainboard/google/brya/Kconfig
index 58b8922..8d09f2e 100644
--- a/src/mainboard/google/brya/Kconfig
+++ b/src/mainboard/google/brya/Kconfig
@@ -644,6 +644,7 @@
    select HAVE_WWAN_POWER_SEQUENCE
    select DRIVERS_WWAN_FM350GL
    select SOC_INTEL_COMMON_BLOCK_HDA_VERB
+	select ENFORCE_MEM_CHANNEL_DISABLE

config BOARD_GOOGLE_VELL
    select BOARD_GOOGLE_BASEBOARD_BRYA
diff --git a/src/mainboard/google/brya/variants/uldrenite/memory.c b/src/mainboard/google/brya/variants/uldrenite/memory.c
index 9ade7c2..949164f 100644
--- a/src/mainboard/google/brya/variants/uldrenite/memory.c
+++ b/src/mainboard/google/brya/variants/uldrenite/memory.c
@@ -3,6 +3,7 @@
 #include <baseboard/variants.h>
 #include <gpio.h>
 #include <soc/romstage.h>
+#include <soc/meminit.h>

static const struct mb_cfg variant_memcfg = {
    .type = MEM_TYPE_LP5X,
@@ -109,3 +110,16 @@
    spd_info->topo = MEM_TOPO_MEMORY_DOWN;
    spd_info->cbfs_index = variant_memory_sku();
 }
+
+uint8_t mb_get_channel_disable_mask(void)
+{
+	/*
+	 * GPP_E13 High -> One RAM Chip
+	 * GPP_E13 Low  -> Two RAM Chip
+	 */
+	if (gpio_get(GPP_E13)) {
+                // Disable all other channels except first two on each controller
+                return (BIT(2) | BIT(3));
+        }
+        return 0;
+}