[coreboot-gerrit] Change in coreboot[master]: mb/google/drallion: Update IA VR TDC current limit

[John Su (Code Review)]

John Su has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/38718 )

Change subject: mb/google/drallion: Update IA VR TDC current limit
......................................................................

mb/google/drallion: Update IA VR TDC current limit

Since Drallion is run CML U platform use baseline CPU
and follow b:148912093#comment1.

Change IA TDC value from 58w to 48w.

BUG=b:148912093
BRANCH=None
TEST=build coreboot and checked IA_TDC from TAT tool.

Change-Id: I5a80fb4fd0a9bd9bc343c1c0c7b47bb947fca226
Signed-off-by: John Su 
---
M src/mainboard/google/drallion/ramstage.c
1 file changed, 22 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/18/38718/1

diff --git a/src/mainboard/google/drallion/ramstage.c b/src/mainboard/google/drallion/ramstage.c
index 3855045..40a0faf 100644
--- a/src/mainboard/google/drallion/ramstage.c
+++ b/src/mainboard/google/drallion/ramstage.c
@@ -21,11 +21,33 @@
 #include <soc/ramstage.h>
 #include <variant/gpio.h>
 #include <vendorcode/google/chromeos/chromeos.h>
+#include <device/pci_ids.h>
+#include <device/pci_ops.h>

#define VPD_KEY_SYSTEM_SERIAL		"serial_number"
 #define VPD_KEY_MAINBOARD_SERIAL	"mlb_serial_number"
 #define VPD_SERIAL_LEN			64

+/* Thermal Design Current current limit. 0-4095 in 1/8A units. 1000 = 125A */
+#define VR_CFG_TDC(i) (uint16_t)((i) * 8)
+
+void mainboard_silicon_init_params(FSP_S_CONFIG *params)
+{
+	config_t *cfg = config_of_soc();
+	static uint16_t mch_id = 0;
+
+	if (!mch_id) {
+		struct device *dev = pcidev_path_on_root(SA_DEVFN_ROOT);
+		mch_id = dev ? pci_read_config16(dev, PCI_DEVICE_ID) : 0xffff;
+	}
+	/* IA TDC current limit is 48A for baseline U42 and U62 */
+	if ((mch_id == PCI_DEVICE_ID_INTEL_CML_ULT) || (mch_id == PCI_DEVICE_ID_INTEL_CML_ULT_6_2)) {
+		if (cfg->cpu_pl2_4_cfg == baseline)
+		/* TdcPowerLimit[1] = IA TDC current limit */
+			params->TdcPowerLimit[1] = VR_CFG_TDC(48);
+	}
+}
+
 const char *smbios_system_serial_number(void)
 {
    static char serial[VPD_SERIAL_LEN];