linux-kernel - [116/143] e1000e: Reset 82577/82578 PHY before first PHY register read

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Message-Id: <20110506002216.647860787@clark.kroah.org>
Date:	Thu, 05 May 2011 17:21:41 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Bruce Allan <bruce.w.allan@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [116/143] e1000e: Reset 82577/82578 PHY before first PHY register read

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Bruce Allan <bruce.w.allan@...el.com>

commit 627c8a041f7aaaea93c766f69bd61d952a277586 upstream.

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@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
[Backported to 2.6.32 by dann frazier <dannf@...ian.org>]
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/net/e1000e/ich8lan.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

--- a/drivers/net/e1000e/ich8lan.c
+++ b/drivers/net/e1000e/ich8lan.c
@@ -274,6 +274,16 @@ static s32 e1000_init_phy_params_pchlan(
 	phy->ops.write_phy_reg_locked = e1000_write_phy_reg_hv_locked;
 	phy->autoneg_mask             = AUTONEG_ADVERTISE_SPEED_DEFAULT;
 
+	/*
+	 * 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;
 	e1000e_get_phy_id(hw);
 	phy->type = e1000e_get_phy_type_from_id(phy->id);
@@ -287,6 +297,7 @@ static s32 e1000_init_phy_params_pchlan(
 		phy->ops.commit_phy = e1000e_phy_sw_reset;
 	}
 
+ out:
 	return ret_val;
 }
 


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