diff mbox series

[v2,79/99] ram: rk3399: Update lpddr4 vref_mode_ac

Message ID 20190617073252.27810-80-jagan@amarulasolutions.com (mailing list archive)
State New, archived
Headers show
Series ram: rk3399: Add LPDDR4 support | expand

Commit Message

Jagan Teki June 17, 2019, 7:32 a.m. UTC 
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>
---
 drivers/ram/rockchip/sdram_rk3399.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/ram/rockchip/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c
index 0e98079468..e3180d0ef2 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 */