[U-Boot] [PATCH v3 31/57] ram: rk3399: Configure tsel write ca for lpddr4

Jagan Teki
2019-07-16T11:57:19Z

tsel write ca_p and ca_n values need to write on PHY 544, 672
and 800 to configure ds odt.

Configure the same PHY register for lpddr4 would require a mask
value of (300 << 8).

Add support for it.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: YouMin Chen <cym@rock-chips.com>
---
drivers/ram/rockchip/sdram_rk3399.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/ram/rockchip/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c
index 7689711a99..1050cbdb07 100644
--- a/drivers/ram/rockchip/sdram_rk3399.c
+++ b/drivers/ram/rockchip/sdram_rk3399.c
@@ -502,9 +502,18 @@ static void set_ds_odt(const struct chan_info *chan,

/* phy_adr_tsel_select_ 8bits DENALI_PHY_544/672/800 offset_0 */
reg_value = tsel_wr_select_ca_n | (tsel_wr_select_ca_p << 0x4);
- clrsetbits_le32(&denali_phy[544], 0xff, reg_value);
- clrsetbits_le32(&denali_phy[672], 0xff, reg_value);
- clrsetbits_le32(&denali_phy[800], 0xff, reg_value);
+ if (IS_ENABLED(CONFIG_RAM_RK3399_LPDDR4)) {
+ /* LPDDR4 these register read always return 0, so
+ * can not use clrsetbits_le32(), need to write32
+ */
+ writel((0x300 << 8) | reg_value, &denali_phy[544]);
+ writel((0x300 << 8) | reg_value, &denali_phy[672]);
+ writel((0x300 << 8) | reg_value, &denali_phy[800]);
+ } else {
+ clrsetbits_le32(&denali_phy[544], 0xff, reg_value);
+ clrsetbits_le32(&denali_phy[672], 0xff, reg_value);
+ clrsetbits_le32(&denali_phy[800], 0xff, reg_value);
+ }

/* phy_pad_addr_drive 8bits DENALI_PHY_928 offset_0 */
clrsetbits_le32(&denali_phy[928], 0xff, reg_value);
--
2.18.0.321.gffc6fa0e3