npu2-hw-procedures: Fix link retraining on reset

Link retraining was showing reliability problems due to some
opencapi-only settings not being optimized. This patch updates some
extra PHY state, as agreed with the PHY team. Though they mostly
impact link retraining behavior, they should also be set at boot.

Reviewed-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>

hw/npu2-hw-procedures.c

@@ -60,8 +60,14 @@ static struct npu2_phy_reg NPU2_PHY_RX_PR_FW_OFF	   = {0x08a, 56, 1};
 static struct npu2_phy_reg NPU2_PHY_RX_PR_FW_INERTIA_AMT   = {0x08a, 57, 3};
 static struct npu2_phy_reg NPU2_PHY_RX_CFG_LTE_MC	   = {0x000, 60, 4};
 static struct npu2_phy_reg NPU2_PHY_RX_A_INTEG_COARSE_GAIN = {0x00a, 48, 4};
+static struct npu2_phy_reg NPU2_PHY_RX_A_CTLE_COARSE	   = {0x00c, 48, 5};
+static struct npu2_phy_reg NPU2_PHY_RX_A_CTLE_GAIN	   = {0x00c, 53, 4};
 static struct npu2_phy_reg NPU2_PHY_RX_B_INTEG_COARSE_GAIN = {0x026, 48, 4};
+static struct npu2_phy_reg NPU2_PHY_RX_B_CTLE_COARSE	   = {0x028, 48, 5};
+static struct npu2_phy_reg NPU2_PHY_RX_B_CTLE_GAIN	   = {0x028, 53, 4};
 static struct npu2_phy_reg NPU2_PHY_RX_E_INTEG_COARSE_GAIN = {0x030, 48, 4};
+static struct npu2_phy_reg NPU2_PHY_RX_E_CTLE_COARSE	   = {0x032, 48, 5};
+static struct npu2_phy_reg NPU2_PHY_RX_E_CTLE_GAIN	   = {0x032, 53, 4};
 
 /* These registers are per-PHY, not per lane */
 static struct npu2_phy_reg NPU2_PHY_RX_SPEED_SELECT	       = {0x262, 51, 2};
@@ -429,6 +435,16 @@ static uint32_t phy_reset_complete(struct npu2_dev *ndev)
 		phy_write_lane(ndev, &NPU2_PHY_RX_A_INTEG_COARSE_GAIN, lane, 11);
 		phy_write_lane(ndev, &NPU2_PHY_RX_B_INTEG_COARSE_GAIN, lane, 11);
 		phy_write_lane(ndev, &NPU2_PHY_RX_E_INTEG_COARSE_GAIN, lane, 11);
+
+		if (ndev->type == NPU2_DEV_TYPE_OPENCAPI) {
+			phy_write_lane(ndev, &NPU2_PHY_RX_A_CTLE_GAIN, lane, 0);
+			phy_write_lane(ndev, &NPU2_PHY_RX_B_CTLE_GAIN, lane, 0);
+			phy_write_lane(ndev, &NPU2_PHY_RX_E_CTLE_GAIN, lane, 0);
+
+			phy_write_lane(ndev, &NPU2_PHY_RX_A_CTLE_COARSE, lane, 20);
+			phy_write_lane(ndev, &NPU2_PHY_RX_B_CTLE_COARSE, lane, 20);
+			phy_write_lane(ndev, &NPU2_PHY_RX_E_CTLE_COARSE, lane, 20);
+		}
 	}
 
 	set_iovalid(ndev, true);