mb/novacustom/mtl-h/ramstage.c: Configure TBT force power properly

The default state of TBT force power GPIO was not consistent across
variants. Assert TBT force power by default before FSP so that the
initialization will be done when the retimer is active.

De-assert TBT force power before handing off to the payload, so that
the RTD3 logic will work in OS.

Signed-off-by: Michał Żygowski <michal.zygowski@3mdeb.com>

Author: miczyg1

src/mainboard/novacustom/mtl-h/ramstage.c

@@ -5,6 +5,7 @@
 #include <ec/acpi/ec.h>
 #include <ec/dasharo/ec/acpi.h>
 #include <fmap.h>
+#include <gpio.h>
 #include <lib.h>
 #include <mainboard/variants.h>
 #include <security/vboot/vboot_common.h>
@@ -235,6 +236,12 @@ void __weak variant_final(void)
 static void mainboard_final(void *chip_info)
 {
 	variant_final();
+
+	/*
+	 * De-assert TBT force power to allow RTD3.
+	 * It is asserted by default in gpio tables.
+	 */
+	gpio_set(GPP_B21, 0);
 }
 
 struct chip_operations mainboard_ops = {

src/mainboard/novacustom/mtl-h/variants/dgpu/gpio.c

@@ -234,7 +234,7 @@ static const struct pad_config gpio_table[] = {
 	PAD_CFG_GPO(GPP_B18, 1, DEEP),	/* GPIO - PCH_BT_EN */
 	PAD_CFG_GPO(GPP_B19, 1, DEEP),	/* GPIO - WIFI_RF_EN */
 	PAD_CFG_GPO(GPP_B20, 0, DEEP),	/* GPIO */
-	PAD_CFG_GPO(GPP_B21, 0, PLTRST),	/* GPIO - TBT_FORCE_PWR */
+	PAD_CFG_GPO(GPP_B21, 1, PLTRST),	/* GPIO - TBT_FORCE_PWR */
 	PAD_CFG_GPO(GPP_B22, 0, DEEP),	/* GPIO */
 	PAD_CFG_TERM_GPO(GPP_B23, 0, DN_20K, DEEP),	/* GPIO */
 	PAD_CFG_NF(GPP_ACI3C0_CLK_LPBK, NATIVE, DEEP, NF4),	/* n/a */