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Commit dfc70755 authored by Akeem G Abodunrin's avatar Akeem G Abodunrin Committed by Jeff Kirsher
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igb: M88E1543 PHY downshift implementation 



This patch implements downshift mechanism for M88E1543 PHY, so that
downshift is disabled first during link setup process, and later enabled
if we are master and downshift link is negotiated. Also cleaned up
return code implementation.

Signed-off-by: default avatarAkeem G Abodunrin <akeem.g.abodunrin@intel.com>
Tested-by: default avatarAaron Brown <aaron.f.brown@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 99af4729

drivers/net/ethernet/intel/igb/e1000_phy.c

+20 −9
Original line number Diff line number Diff line
@@ -731,15 +731,13 @@ s32 igb_copper_link_setup_m88_gen2(struct e1000_hw *hw) 
	s32 ret_val;

	u16 phy_data;



	if (phy->reset_disable) {

		ret_val = 0;

		goto out;

	}

	if (phy->reset_disable)

		return 0;



	/* Enable CRS on Tx. This must be set for half-duplex operation. */

	ret_val = phy->ops.read_reg(hw, M88E1000_PHY_SPEC_CTRL, &phy_data);

	if (ret_val)

		goto out;

		return ret_val;



	/* Options:

	 *   MDI/MDI-X = 0 (default)
@@ -780,23 +778,36 @@ s32 igb_copper_link_setup_m88_gen2(struct e1000_hw *hw) 
		phy_data |= M88E1000_PSCR_POLARITY_REVERSAL;



	/* Enable downshift and setting it to X6 */

	if (phy->id == M88E1543_E_PHY_ID) {

		phy_data &= ~I347AT4_PSCR_DOWNSHIFT_ENABLE;

		ret_val =

		    phy->ops.write_reg(hw, M88E1000_PHY_SPEC_CTRL, phy_data);

		if (ret_val)

			return ret_val;



		ret_val = igb_phy_sw_reset(hw);

		if (ret_val) {

			hw_dbg("Error committing the PHY changes\n");

			return ret_val;

		}

	}



	phy_data &= ~I347AT4_PSCR_DOWNSHIFT_MASK;

	phy_data |= I347AT4_PSCR_DOWNSHIFT_6X;

	phy_data |= I347AT4_PSCR_DOWNSHIFT_ENABLE;



	ret_val = phy->ops.write_reg(hw, M88E1000_PHY_SPEC_CTRL, phy_data);

	if (ret_val)

		goto out;

		return ret_val;



	/* Commit the changes. */

	ret_val = igb_phy_sw_reset(hw);

	if (ret_val) {

		hw_dbg("Error committing the PHY changes\n");

		goto out;

		return ret_val;

	}



out:

	return ret_val;

	return 0;

}



/**