From 1783575c1a11f726130522b851737cddda4c14c0 Mon Sep 17 00:00:00 2001 From: Emil Tantilov Date: Wed, 16 Feb 2011 01:38:13 +0000 Subject: [PATCH] ixgbe: add polling test to end of PHY reset Some PHYs require that we poll the reset bit and wait for it to clear before continuing initialization. As such we should add this check to the end of the ixgbe_reset_phy_generic routine. Signed-off-by: Emil Tantilov Tested-by: Stephen Ko Signed-off-by: Jeff Kirsher --- drivers/net/ixgbe/ixgbe_phy.c | 40 +++++++++++++++++++++++++++++++++++++--- 1 file changed, 37 insertions(+), 3 deletions(-) diff --git a/drivers/net/ixgbe/ixgbe_phy.c b/drivers/net/ixgbe/ixgbe_phy.c index f8a60ca..ebd6e44 100644 --- a/drivers/net/ixgbe/ixgbe_phy.c +++ b/drivers/net/ixgbe/ixgbe_phy.c @@ -138,17 +138,51 @@ static enum ixgbe_phy_type ixgbe_get_phy_type_from_id(u32 phy_id) **/ s32 ixgbe_reset_phy_generic(struct ixgbe_hw *hw) { + u32 i; + u16 ctrl = 0; + s32 status = 0; + + if (hw->phy.type == ixgbe_phy_unknown) + status = ixgbe_identify_phy_generic(hw); + + if (status != 0 || hw->phy.type == ixgbe_phy_none) + goto out; + /* Don't reset PHY if it's shut down due to overtemp. */ if (!hw->phy.reset_if_overtemp && (IXGBE_ERR_OVERTEMP == hw->phy.ops.check_overtemp(hw))) - return 0; + goto out; /* * Perform soft PHY reset to the PHY_XS. * This will cause a soft reset to the PHY */ - return hw->phy.ops.write_reg(hw, MDIO_CTRL1, MDIO_MMD_PHYXS, - MDIO_CTRL1_RESET); + hw->phy.ops.write_reg(hw, MDIO_CTRL1, + MDIO_MMD_PHYXS, + MDIO_CTRL1_RESET); + + /* + * Poll for reset bit to self-clear indicating reset is complete. + * Some PHYs could take up to 3 seconds to complete and need about + * 1.7 usec delay after the reset is complete. + */ + for (i = 0; i < 30; i++) { + msleep(100); + hw->phy.ops.read_reg(hw, MDIO_CTRL1, + MDIO_MMD_PHYXS, &ctrl); + if (!(ctrl & MDIO_CTRL1_RESET)) { + udelay(2); + break; + } + } + + if (ctrl & MDIO_CTRL1_RESET) { + status = IXGBE_ERR_RESET_FAILED; + hw_dbg(hw, "PHY reset polling failed to complete.\n"); + } + +out: + return status; } /** -- 2.7.4