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ram: rk3399: Update lpddr4 vref_mode_ac

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Update vref_mode_ac for lpddr4 based on VDDQ/3/2=16.8%

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
Reviewed-by: Kever Yang <Kever.yang@rock-chips.com>
This commit is contained in:
Jagan Teki
2019-07-16 17:27:28 +05:30
committed by Kever Yang
parent 274c33737b
commit e939f92eae
1 changed files with 2 additions and 1 deletions
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3
drivers/ram/rockchip/sdram_rk3399.c
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@@ -366,7 +366,8 @@ static int phy_io_config(const struct chan_info *chan,
vref_value_dq = (rd_vref - 15300) / 521; vref_value_dq = (rd_vref - 15300) / 521;
} }
vref_mode_ac = 0x6; vref_mode_ac = 0x6;
vref_value_ac = 0x1f; /* VDDQ/3/2=16.8% */
vref_value_ac = 0x3;
} else if (params->base.dramtype == LPDDR3) { } else if (params->base.dramtype == LPDDR3) {
if (params->base.odt == 1) { if (params->base.odt == 1) {
vref_mode_dq = 0x5; /* LPDDR3 ODT */ vref_mode_dq = 0x5; /* LPDDR3 ODT */