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vc/mediatek/mt8195: Optimize DRAM init time by limiting frequency count

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Support the config MEDIATEK_DRAM_DVFS_LIMIT_FREQ_CNT to limit DRAM
frequency counts to reduce DRAM initialization time by about 100ms.

BUG=b:195274787

Signed-off-by: Ryan Chuang <ryan.chuang@mediatek.corp-partner.google.com>
Change-Id: Ibcb9a50c24f428358ef682b64946d4c91ebd81d2
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56849
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.corp-partner.google.com>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
This commit is contained in:
Ryan Chuang
2021-08-06 11:00:25 +08:00
committed by Hung-Te Lin
parent 5889f02032
commit eb94a4a6de
1 changed files with 3 additions and 0 deletions
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3
src/vendorcode/mediatek/mt8195/dramc/dramc_pi_main.c
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@ -1882,6 +1882,9 @@ int Init_DRAM(DRAM_DRAM_TYPE_T dram_type, DRAM_CBT_MODE_EXTERN_T dram_cbt_mode_e
ett_fix_freq = 1; /* only 1600 & 4266 */
#endif
if (CONFIG(MEDIATEK_DRAM_DVFS_LIMIT_FREQ_CNT))
ett_fix_freq = 0x1; // 4266, 1600
if (ett_fix_freq != 0xff)
gAndroid_DVFS_en = FALSE;