From: Jagan Teki <jagan@amarulasolutions.com>
Date: Tue, 16 Jul 2019 11:57:28 +0000 (+0530)
Subject: ram: rk3399: Update lpddr4 vref_mode_ac
X-Git-Tag: v2019.10-rc1~20^2~74
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e939f92eae5b6524c18cbb4a42f4cc3910e5d018;p=platform%2Fkernel%2Fu-boot.git

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>
---

diff --git a/drivers/ram/rockchip/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c
index 84a09fe..da94bbe 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 */