mb/google/hatch/var/helios: Implement variant_memory_sku()

This change provides an implementation of variant_memory_sku() for
helios that overrides memory ID 3 and 4 to 0 and 1 to workaround the
incorrect memory straps in hardware for board id 0 and unknown.

BUG=b:133455595

Change-Id: I38fab1f91decac5d0a146e5a6c74e88f677af305
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34252
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/src/mainboard/google/hatch/variants/helios/memory.c b/src/mainboard/google/hatch/variants/helios/memory.c
index 64b4cac8d04d..a3cd813f09eb 100644
--- a/src/mainboard/google/hatch/variants/helios/memory.c
+++ b/src/mainboard/google/hatch/variants/helios/memory.c
@@ -15,8 +15,11 @@
 
 #include <baseboard/variants.h>
 #include <baseboard/gpio.h>
+#include <boardid.h>
+#include <gpio.h>
 #include <soc/cnl_memcfg_init.h>
 #include <string.h>
+#include <variant/gpio.h>
 
 static const struct cnl_mb_cfg baseboard_memcfg = {
 	/*
@@ -66,3 +69,34 @@ void variant_memory_params(struct cnl_mb_cfg *bcfg)
 {
 	memcpy(bcfg, &baseboard_memcfg, sizeof(baseboard_memcfg));
 }
+
+int variant_memory_sku(void)
+{
+	const gpio_t spd_gpios[] = {
+		GPIO_MEM_CONFIG_0,
+		GPIO_MEM_CONFIG_1,
+		GPIO_MEM_CONFIG_2,
+		GPIO_MEM_CONFIG_3,
+	};
+
+	int val = gpio_base2_value(spd_gpios, ARRAY_SIZE(spd_gpios));
+
+	if ((board_id() != 0) && (board_id() != BOARD_ID_UNKNOWN))
+		return val;
+
+	/*
+	 * For boards with id 0 or unknown, memory straps 3 and 4 are
+	 * incorrectly stuffed in hardware. This is a workaround for these
+	 * boards to override memory strap 3 to 0 and 4 to 1.
+	 */
+	switch (val) {
+	case 3:
+		val = 0;
+		break;
+	case 4:
+		val = 1;
+		break;
+	}
+
+	return val;
+}