From e939f92eae5b6524c18cbb4a42f4cc3910e5d018 Mon Sep 17 00:00:00 2001 From: Jagan Teki Date: Tue, 16 Jul 2019 17:27:28 +0530 Subject: [PATCH] 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 Signed-off-by: YouMin Chen Reviewed-by: Kever Yang --- drivers/ram/rockchip/sdram_rk3399.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) 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 */ -- 2.25.1