Message ID | 20190716115745.12585-41-jagan@amarulasolutions.com |
---|---|
State | Accepted |
Commit | e939f92eae5b6524c18cbb4a42f4cc3910e5d018 |
Delegated to: | Kever Yang |
Headers | show |
Series | ram: rk3399: Add LPDDR4 support | expand |
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 <jagan@amarulasolutions.com> > Signed-off-by: YouMin Chen <cym@rock-chips.com> Reviewed-by: Kever Yang <Kever.yang@rock-chips.com> 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 */
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 */