[68/92] ram: rk3399: Configure tsel write ca for lpddr4
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Message ID 20190611145135.21399-69-jagan@amarulasolutions.com
State New
Headers show
Series
  • ram: rk3399: Add LPDDR4 support
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Commit Message

Jagan Teki June 11, 2019, 2:51 p.m. UTC
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(-)

Patch
diff mbox series

diff --git a/drivers/ram/rockchip/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c
index ecc215b9c7..a251fc6045 100644
--- a/drivers/ram/rockchip/sdram_rk3399.c
+++ b/drivers/ram/rockchip/sdram_rk3399.c
@@ -503,9 +503,18 @@  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 (sdram_params->base.dramtype == 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);