[dpdk-dev] [PATCH 17/26] ixgbe/base: new simplified x550em init flow

[Wenzhuo Lu]

The init flow is simplified. We no longer wait for the PHY FW init
complete bit to be set as this bit is only set once by the PHY at power
on and then cleared on the first read. So only the first instance of
running SW (or possibly MAC FW) needs to initialize the PHY.

The PHY initialization has been simplified and now only requires that
the PHY FW be "un-stalled". SW no longer needs to put the PHY in
low-power mode or enable the transceiver.

Signed-off-by: Wenzhuo Lu <wenzhuo.lu at intel.com>
---
 drivers/net/ixgbe/base/ixgbe_x550.c | 85 +++++++++----------------------------
 1 file changed, 19 insertions(+), 66 deletions(-)

diff --git a/drivers/net/ixgbe/base/ixgbe_x550.c b/drivers/net/ixgbe/base/ixgbe_x550.c
index 34ea26f..a321594 100644
--- a/drivers/net/ixgbe/base/ixgbe_x550.c
+++ b/drivers/net/ixgbe/base/ixgbe_x550.c
@@ -1293,84 +1293,37 @@ s32 ixgbe_init_ext_t_x550em(struct ixgbe_hw *hw)
 {
 	u32 status;
 	u16 reg;
-	u32 retries = 1;
-
-	/* TODO: The number of attempts and delay between attempts is undefined */
-	do {
-		/* decrement retries counter and exit if we hit 0 */
-		if (retries < 1) {
-			ERROR_REPORT1(IXGBE_ERROR_INVALID_STATE,
-				      "External PHY not yet finished resetting.");
-			return IXGBE_ERR_PHY;
-		}
-		retries--;
-
-		usec_delay(0);
-
-		status = hw->phy.ops.read_reg(hw,
-					      IXGBE_MDIO_TX_VENDOR_ALARMS_3,
-					      IXGBE_MDIO_PMA_PMD_DEV_TYPE,
-					      &reg);
-
-		if (status != IXGBE_SUCCESS)
-			return status;
-
-		/* Verify PHY FW reset has completed */
-	} while ((reg & IXGBE_MDIO_TX_VENDOR_ALARMS_3_RST_MASK) != 1);
 
-	/* Set port to low power mode */
 	status = hw->phy.ops.read_reg(hw,
-				      IXGBE_MDIO_VENDOR_SPECIFIC_1_CONTROL,
-				      IXGBE_MDIO_VENDOR_SPECIFIC_1_DEV_TYPE,
-				      &reg);
-
-	if (status != IXGBE_SUCCESS)
-		return status;
-
-	reg |= IXGBE_MDIO_PHY_SET_LOW_POWER_MODE;
-
-	status = hw->phy.ops.write_reg(hw,
-				       IXGBE_MDIO_VENDOR_SPECIFIC_1_CONTROL,
-				       IXGBE_MDIO_VENDOR_SPECIFIC_1_DEV_TYPE,
-				       reg);
-
-	if (status != IXGBE_SUCCESS)
-		return status;
-
-	/* Enable the transmitter */
-	status = hw->phy.ops.read_reg(hw,
-				      IXGBE_MDIO_PMD_STD_TX_DISABLE_CNTR,
+				      IXGBE_MDIO_TX_VENDOR_ALARMS_3,
 				      IXGBE_MDIO_PMA_PMD_DEV_TYPE,
 				      &reg);
 
 	if (status != IXGBE_SUCCESS)
 		return status;
 
-	reg &= ~IXGBE_MDIO_PMD_GLOBAL_TX_DISABLE;
-
-	status = hw->phy.ops.write_reg(hw,
-				       IXGBE_MDIO_PMD_STD_TX_DISABLE_CNTR,
-				       IXGBE_MDIO_PMA_PMD_DEV_TYPE,
-				       reg);
-
-	if (status != IXGBE_SUCCESS)
-		return status;
+	/* If PHY FW reset completed bit is set then this is the first
+	 * SW instance after a power on so the PHY FW must be un-stalled.
+	 */
+	if (reg & IXGBE_MDIO_TX_VENDOR_ALARMS_3_RST_MASK) {
+		status = hw->phy.ops.read_reg(hw,
+					IXGBE_MDIO_GLOBAL_RES_PR_10,
+					IXGBE_MDIO_VENDOR_SPECIFIC_1_DEV_TYPE,
+					&reg);
 
-	/* Un-stall the PHY FW */
-	status = hw->phy.ops.read_reg(hw,
-				      IXGBE_MDIO_GLOBAL_RES_PR_10,
-				      IXGBE_MDIO_VENDOR_SPECIFIC_1_DEV_TYPE,
-				      &reg);
+		if (status != IXGBE_SUCCESS)
+			return status;
 
-	if (status != IXGBE_SUCCESS)
-		return status;
+		reg &= ~IXGBE_MDIO_POWER_UP_STALL;
 
-	reg &= ~IXGBE_MDIO_POWER_UP_STALL;
+		status = hw->phy.ops.write_reg(hw,
+					IXGBE_MDIO_GLOBAL_RES_PR_10,
+					IXGBE_MDIO_VENDOR_SPECIFIC_1_DEV_TYPE,
+					reg);
 
-	status = hw->phy.ops.write_reg(hw,
-				       IXGBE_MDIO_GLOBAL_RES_PR_10,
-				       IXGBE_MDIO_VENDOR_SPECIFIC_1_DEV_TYPE,
-				       reg);
+		if (status != IXGBE_SUCCESS)
+			return status;
+	}
 
 	return status;
 }
-- 
1.9.3