mediatek/mt8183: Implement the dramc init setting

This patch implements the dram init setting by replacing the hard-coded
init sequence with a series of functions to support calibration for more
frequencies. These functions are modified from MediaTek's internal DRAM
full calibration source code.

BUG=b:80501386
BRANCH=none
TEST=1. Kukui boots correctly
     2. Stress test (/usr/sbin/memtester 500M) passes on Kukui

Change-Id: I756ad37e78cd1384ee0eb97e5e18c5461d73bc7b
Signed-off-by: Huayang Duan <huayang.duan@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34988
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/src/soc/mediatek/mt8183/emi.c b/src/soc/mediatek/mt8183/emi.c
index 937d06de37..26e8260deb 100644
--- a/src/soc/mediatek/mt8183/emi.c
+++ b/src/soc/mediatek/mt8183/emi.c
@@ -279,16 +279,17 @@ static void dramc_ac_timing_optimize(void)
 	}
 }
 
-static void init_dram(const struct sdram_params *params)
+static void init_dram(const struct sdram_params *params, u8 freq_group)
 {
 	global_option_init(params);
 	emi_init(params);
 
 	dramc_set_broadcast(DRAMC_BROADCAST_ON);
 	dramc_init_pre_settings();
-	dramc_sw_impedance(params);
+	dramc_sw_impedance_cal(params, ODT_OFF);
+	dramc_sw_impedance_cal(params, ODT_ON);
 
-	dramc_init();
+	dramc_init(params, freq_group);
 	emi_init2(params);
 }
 
@@ -312,6 +313,6 @@ static void do_calib(const struct sdram_params *params)
 
 void mt_set_emi(const struct sdram_params *params)
 {
-	init_dram(params);
+	init_dram(params, LP4X_DDR3200);
 	do_calib(params);
 }