soc/mediatek/mt8183: Run DRAM full calibration

Load the calibration params from flash first and check the correctness
of the params. If the params have correct format, perform DRAM fast
calibration with these params to reduce bootup time. Otherwise, load the
DRAM blob and perform DRAM full calibration.

Bootup time of DRAM partial calibration:
 - 1,349,385 usecs with low frequency
 -   924,698 usecs with middle frequency
 - 1,270,089 usecs with high frequency
3,544,172 usecs in total.

Bootup time of DRAM fast calibration:
 - 216,663 usecs with low frequency
 - 328,220 usecs with middle frequency
 - 322,612 usecs with high frequency
867,495 usecs in total.

BUG=b:139099592
BRANCH=none
TEST=emerge-kukui coreboot

Change-Id: I8de29b14b1fb24b3b4f351c855c5c4d8f350cc34
Signed-off-by: Huayang Duan <huayang.duan@mediatek.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35110
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/soc/mediatek/mt8183/include/soc/emi.h b/src/soc/mediatek/mt8183/include/soc/emi.h
index ab21bc7e1216..624c0a4ac314 100644
--- a/src/soc/mediatek/mt8183/include/soc/emi.h
+++ b/src/soc/mediatek/mt8183/include/soc/emi.h
@@ -71,6 +71,8 @@ struct sdram_params {
 	u16 delay_cell_unit;
 };
 
+struct dramc_param_ops;
+
 enum {
 	LP4X_DDR1600,
 	LP4X_DDR2400,
@@ -86,6 +88,6 @@ size_t sdram_size(void);
 const struct sdram_params *get_sdram_config(void);
 void enable_emi_dcm(void);
 void mt_set_emi(const struct sdram_params *freq_params);
-void mt_mem_init(const struct sdram_params *freq_params);
+void mt_mem_init(struct dramc_param_ops *dparam_ops);
 
 #endif /* SOC_MEDIATEK_MT8183_EMI_H */