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e1000e: Reset 82577/82578 PHY before first PHY register read

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Reset the PHY before first accessing it.  Doing so, ensure that the PHY is
in a known good state before we read/write PHY registers. This fixes a
driver probe failure.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bruce Allan 2010-05-05 22:00:27 +00:00 committed by David S. Miller
parent 6dfaa76994
commit 627c8a041f
1 changed files with 10 additions and 0 deletions
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10
drivers/net/e1000e/ich8lan.c
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@ -294,6 +294,16 @@ static s32 e1000_init_phy_params_pchlan(struct e1000_hw *hw)
msleep(50);
}
/*
* Reset the PHY before any acccess to it. Doing so, ensures that
* the PHY is in a known good state before we read/write PHY registers.
* The generic reset is sufficient here, because we haven't determined
* the PHY type yet.
*/
ret_val = e1000e_phy_hw_reset_generic(hw);
if (ret_val)
goto out;
phy->id = e1000_phy_unknown;
ret_val = e1000e_get_phy_id(hw);
if (ret_val)