On 2019/7/16 下午7:57, Jagan Teki wrote:
Update vref_mode_ac for lpddr4 based on VDDQ/3/2=16.8%
Signed-off-by: Jagan Teki <[email protected]>
Signed-off-by: YouMin Chen <[email protected]>
Reviewed-by: Kever Yang <[email protected]>
Thanks,
- Kever
---
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 63763062f9..e3f1abf7e7 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 */
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