Change in coreboot[master]: vc/mediatek/mt8195: Enable DRAM Vcore DVFS settings

[Hung-Te Lin (Code Review)]

Hung-Te Lin has submitted this change. ( https://review.coreboot.org/c/coreboot/+/56106 )

Change subject: vc/mediatek/mt8195: Enable DRAM Vcore DVFS settings
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vc/mediatek/mt8195: Enable DRAM Vcore DVFS settings

Add the implementation for vcore voltage control.
Also remove the reporting of vio18 because it is fixed during DRAM init,
and we won't provide drivers for reading or writing it.

Signed-off-by: Ryan Chuang 
Change-Id: I39342aea902a87cdc2c5b862e5d1a889fcc822c5
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56106
Reviewed-by: Hung-Te Lin 
Reviewed-by: Yu-Ping Wu 
Tested-by: build bot (Jenkins) 
---
M src/vendorcode/mediatek/mt8195/dramc/dramc_pi_main.c
M src/vendorcode/mediatek/mt8195/dramc/dramc_top.c
2 files changed, 6 insertions(+), 2 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Hung-Te Lin: Looks good to me, but someone else must approve
  Yu-Ping Wu: Looks good to me, approved

diff --git a/src/vendorcode/mediatek/mt8195/dramc/dramc_pi_main.c b/src/vendorcode/mediatek/mt8195/dramc/dramc_pi_main.c
index b761473..b5de592 100644
--- a/src/vendorcode/mediatek/mt8195/dramc/dramc_pi_main.c
+++ b/src/vendorcode/mediatek/mt8195/dramc/dramc_pi_main.c
@@ -272,7 +272,6 @@

#ifndef DDR_INIT_TIME_PROFILING
     print("Read voltage for %d, %d\n", p->frequency, vGet_Current_SRAMIdx(p));
-    print("Vio18 = %d\n", dramc_get_vio18_voltage());
     print("Vcore = %d\n", dramc_get_vcore_voltage());
     print("Vdram = %d\n", dramc_get_vmdd_voltage(p->dram_type));
     print("Vddq = %d\n", dramc_get_vmddq_voltage(p->dram_type));
diff --git a/src/vendorcode/mediatek/mt8195/dramc/dramc_top.c b/src/vendorcode/mediatek/mt8195/dramc/dramc_top.c
index 570c976..5662412 100644
--- a/src/vendorcode/mediatek/mt8195/dramc/dramc_top.c
+++ b/src/vendorcode/mediatek/mt8195/dramc/dramc_top.c
@@ -352,8 +352,13 @@
 {
 #ifdef MTK_PMIC_MT6359
    return mtk_regulator_set_voltage(&reg_vcore, vcore, MAX_VCORE);
-#endif
+#elif defined(FOR_COREBOOT)
+	dramc_debug("%s set vcore to %u\n", __func__, vcore);
+	mainboard_set_regulator_vol(MTK_REGULATOR_VCORE, vcore);
    return 0;
+#else
+	return 0;
+#endif
 }

unsigned int dramc_get_vcore_voltage(void)