rockchip/rk3399: sdram: correct controller vref setting

When enabling the controller ODT, the controller vref needs to
correspond with the ODT value and DQ drive strength.

BRANCH=none
BUG=chrome-os-partner:54871
TEST=run "stressapptest -M 1024 -s 1000" on kevin board and pass

Original-Commit-Id: a7251c72b87d9f149b68d086c3252f1c668e0e80
Original-Change-Id: I7e54b3473f68a382208a0fb0b0600552fe6390ad
Original-Signed-off-by: Lin Huang <hl@rock-chips.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/358762
Original-Commit-Ready: Dan Shi <dshi@chromium.org>
Original-Tested-by: Caesar Wang <wxt@rock-chips.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>

Squashed with:

rockchip/rk3399: Halt if we get an invalid odt or drv value

When we were pushing the updated sdram.c to coreboot.org, the compiler
there found that we were not initializing vref_value_dq in all code
possible code paths.

This patch updates those code paths to halt the system.

Branch=none
Bug=none
Test=Built with coreboot.org toolchain and verified that the compile
errors were gone.

Change-Id: I0ad4207dc976236d64b6cdda58d10bcfbe1fde11
Signed-off-by: Martin Roth <martinroth@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/362726
Reviewed-by: Julius Werner <jwerner@chromium.org>

Change-Id: I22a0cef6f12d9aae2ea4dcb99e7ebdd788f2cdd1
Signed-off-by: Martin Roth <martinroth@chromium.org>
Reviewed-on: https://review.coreboot.org/15812
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Julius Werner <jwerner@chromium.org>

1 files changed, 76 insertions, 9 deletions

diff --git a/src/soc/rockchip/rk3399/sdram.c b/src/soc/rockchip/rk3399/sdram.c
index c3db47bcf6..a237a80c7b 100644
--- a/src/soc/rockchip/rk3399/sdram.c
+++ b/src/soc/rockchip/rk3399/sdram.c
@@ -318,22 +318,86 @@ static void phy_io_config(u32 channel,
 			  const struct rk3399_sdram_params *sdram_params)
 {
 	u32 *denali_phy = rk3399_ddr_publ[channel]->denali_phy;
-	u32 vref_mode, vref_value;
+	u32 vref_mode_dq, vref_value_dq, vref_mode_ac, vref_value_ac;
 	u32 mode_sel = 0;
 	u32 reg_value;
+	u32 drv_value, odt_value;
 
 	/* vref setting */
-	if (sdram_params->dramtype == LPDDR4)
-		vref_mode = 0x6;
-	else if (sdram_params->dramtype == LPDDR3)
-		vref_mode = 0x2;
-	else if (sdram_params->dramtype == DDR3)
-		vref_mode = 0x1;
+	if (sdram_params->dramtype == LPDDR4) {
+		/* LPDDR4 */
+		vref_mode_dq = 0x6;
+		vref_value_dq = 0x1f;
+		vref_mode_ac = 0x6;
+		vref_value_ac = 0x1f;
+	} else if (sdram_params->dramtype == LPDDR3) {
+		if (sdram_params->odt == 1) {
+			vref_mode_dq = 0x5;  /* LPDDR3 ODT */
+			drv_value = (read32(&denali_phy[6]) >> 12) & 0xf;
+			odt_value = (read32(&denali_phy[6]) >> 4) & 0xf;
+			if (drv_value == PHY_DRV_ODT_48) {
+				switch (odt_value) {
+				case PHY_DRV_ODT_240:
+					vref_value_dq = 0x16;
+					break;
+				case PHY_DRV_ODT_120:
+					vref_value_dq = 0x26;
+					break;
+				case PHY_DRV_ODT_60:
+					vref_value_dq = 0x36;
+					break;
+				default:
+					die("Halting: Invalid ODT value.\n");
+				}
+			} else if (drv_value == PHY_DRV_ODT_40) {
+				switch (odt_value) {
+				case PHY_DRV_ODT_240:
+					vref_value_dq = 0x19;
+					break;
+				case PHY_DRV_ODT_120:
+					vref_value_dq = 0x23;
+					break;
+				case PHY_DRV_ODT_60:
+					vref_value_dq = 0x31;
+					break;
+				default:
+					die("Halting: Invalid ODT value.\n");
+				}
+			} else if (drv_value == PHY_DRV_ODT_34_3) {
+				switch (odt_value) {
+				case PHY_DRV_ODT_240:
+					vref_value_dq = 0x17;
+					break;
+				case PHY_DRV_ODT_120:
+					vref_value_dq = 0x20;
+					break;
+				case PHY_DRV_ODT_60:
+					vref_value_dq = 0x2e;
+					break;
+				default:
+					die("Halting: Invalid ODT value.\n");
+				}
+			} else {
+				die("Halting: Invalid DRV value.\n");
+			}
+		} else {
+			vref_mode_dq = 0x2;  /* LPDDR3 */
+			vref_value_dq = 0x1f;
+		}
+		vref_mode_ac = 0x2;
+		vref_value_ac = 0x1f;
+	} else if (sdram_params->dramtype == DDR3) {
+		/* DDR3L */
+		vref_mode_dq = 0x1;
+		vref_value_dq = 0x1f;
+		vref_mode_ac = 0x1;
+		vref_value_ac = 0x1f;
+	}
 	else
 		die("Halting: Unknown DRAM type.\n");
-	vref_value = 0x1f;
 
-	reg_value = (vref_mode << 9) | (0x1 << 8) | vref_value;
+	reg_value = (vref_mode_dq << 9) | (0x1 << 8) | vref_value_dq;
+
 	/* PHY_913 PHY_PAD_VREF_CTRL_DQ_0 12bits offset_8 */
 	clrsetbits_le32(&denali_phy[913], 0xfff << 8, reg_value << 8);
 	/* PHY_914 PHY_PAD_VREF_CTRL_DQ_1 12bits offset_0 */
@@ -342,6 +406,9 @@ static void phy_io_config(u32 channel,
 	clrsetbits_le32(&denali_phy[914], 0xfff << 16, reg_value << 16);
 	/* PHY_915 PHY_PAD_VREF_CTRL_DQ_3 12bits offset_0 */
 	clrsetbits_le32(&denali_phy[915], 0xfff, reg_value);
+
+	reg_value = (vref_mode_ac << 9) | (0x1 << 8) | vref_value_ac;
+
 	/* PHY_915 PHY_PAD_VREF_CTRL_AC 12bits offset_16 */
 	clrsetbits_le32(&denali_phy[915], 0xfff << 16, reg_value << 16);