diff options
| author | Jagan Teki <jagan@amarulasolutions.com> | 2019-07-16 14:57:28 +0300 |
|---|---|---|
| committer | Kever Yang <kever.yang@rock-chips.com> | 2019-07-20 18:59:44 +0300 |
| commit | e939f92eae5b6524c18cbb4a42f4cc3910e5d018 (patch) | |
| tree | a3458c4bb22899ffbde489020f6060362d8516e5 /drivers/ram | |
| parent | 274c33737bcb49d9120ea222ba1a434d3fdca1c7 (diff) | |
| download | u-boot-e939f92eae5b6524c18cbb4a42f4cc3910e5d018.tar.xz | |
ram: rk3399: Update lpddr4 vref_mode_ac
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>
Diffstat (limited to 'drivers/ram')
| -rw-r--r-- | drivers/ram/rockchip/sdram_rk3399.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/ram/rockchip/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c index 84a09fe67d..da94bbef5d 100644 --- a/drivers/ram/rockchip/sdram_rk3399.c +++ b/drivers/ram/rockchip/sdram_rk3399.c @@ -366,7 +366,8 @@ static int phy_io_config(const struct chan_info *chan, vref_value_dq = (rd_vref - 15300) / 521; } vref_mode_ac = 0x6; - vref_value_ac = 0x1f; + /* VDDQ/3/2=16.8% */ + vref_value_ac = 0x3; } else if (params->base.dramtype == LPDDR3) { if (params->base.odt == 1) { vref_mode_dq = 0x5; /* LPDDR3 ODT */ |