[PATCH 75/92] ram: rk3399: Update lpddr4 vref based on io settings

Jagan Teki
2019-06-11T14:51:18Z

The vref_mode_dq, vref_value_dq on lpddr4 value is depending
on IO settings of rd_vref.

Add support for it.

Signed-off-by: Jagan Teki <jagan-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>
Signed-off-by: YouMin Chen <cym-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
---
drivers/ram/rockchip/sdram_rk3399.c | 21 ++++++++++++++++-----
1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/ram/rockchip/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c
index c0e9a4e7c8..413469f4cc 100644
--- a/drivers/ram/rockchip/sdram_rk3399.c
+++ b/drivers/ram/rockchip/sdram_rk3399.c
@@ -339,7 +339,8 @@ static void set_memory_map(const struct chan_info *chan, u32 channel,
}

static int phy_io_config(const struct chan_info *chan,
- const struct rk3399_sdram_params *sdram_params)
+ const struct rk3399_sdram_params *sdram_params,
+ u32 mr5)
{
u32 *denali_phy = chan->publ->denali_phy;
u32 vref_mode_dq, vref_value_dq, vref_mode_ac, vref_value_ac;
@@ -350,9 +351,19 @@ static int phy_io_config(const struct chan_info *chan,

/* vref setting */
if (sdram_params->base.dramtype == LPDDR4) {
- /* LPDDR4 */
- vref_mode_dq = 0x6;
- vref_value_dq = 0x1f;
+ struct io_setting *io = lpddr4_get_io_settings(sdram_params,
+ mr5);
+ u32 rd_vref = io->rd_vref * 1000;
+
+ if (rd_vref < 36700) {
+ /* MODE_LV[2:0] = LPDDR4 (Range 2)*/
+ vref_mode_dq = 0x7;
+ vref_value_dq = (rd_vref - 3300) / 521;
+ } else {
+ /* MODE_LV[2:0] = LPDDR4 (Range 1)*/
+ vref_mode_dq = 0x6;
+ vref_value_dq = (rd_vref - 15300) / 521;
+ }
vref_mode_ac = 0x6;
vref_value_ac = 0x1f;
mode_sel = 0x6;
@@ -771,7 +782,7 @@ static void set_ds_odt(const struct chan_info *chan,
/* phy_pad_fdbk_term 1bit DENALI_PHY_930 offset_17 */
clrsetbits_le32(&denali_phy[930], 0x1 << 17, reg_value);

- phy_io_config(chan, sdram_params);
+ phy_io_config(chan, sdram_params, mr5);
}

static void pctl_start(struct dram_info *dram,
--
2.18.0.321.gffc6fa0e3