From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Kirsher Subject: [net-2.6 PATCH 1/6] e1000e: PHY loopback broken on 82578 Date: Wed, 01 Jul 2009 16:27:31 -0700 Message-ID: <20090701232731.20555.63487.stgit@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, gospo@redhat.com, Bruce Allan , Jeff Kirsher To: davem@davemloft.net Return-path: Received: from qmta05.emeryville.ca.mail.comcast.net ([76.96.30.48]:54020 "EHLO QMTA05.emeryville.ca.mail.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752504AbZGAX1u (ORCPT ); Wed, 1 Jul 2009 19:27:50 -0400 Sender: netdev-owner@vger.kernel.org List-ID: From: Bruce Allan PHY loopback on 82578 fails to work as a result of flushing the packets in the FIFO buffer in the link stall workaround. Don't perform the workaround if in PHY loopback mode. Signed-off-by: Bruce Allan Signed-off-by: Jeff Kirsher --- drivers/net/e1000e/defines.h | 2 ++ drivers/net/e1000e/phy.c | 5 +++++ 2 files changed, 7 insertions(+), 0 deletions(-) diff --git a/drivers/net/e1000e/defines.h b/drivers/net/e1000e/defines.h index 8890c97..4329ec3 100644 --- a/drivers/net/e1000e/defines.h +++ b/drivers/net/e1000e/defines.h @@ -575,6 +575,8 @@ #define PHY_1000T_STATUS 0x0A /* 1000Base-T Status Reg */ #define PHY_EXT_STATUS 0x0F /* Extended Status Reg */ +#define PHY_CONTROL_LB 0x4000 /* PHY Loopback bit */ + /* NVM Control */ #define E1000_EECD_SK 0x00000001 /* NVM Clock */ #define E1000_EECD_CS 0x00000002 /* NVM Chip Select */ diff --git a/drivers/net/e1000e/phy.c b/drivers/net/e1000e/phy.c index e23459c..d845394 100644 --- a/drivers/net/e1000e/phy.c +++ b/drivers/net/e1000e/phy.c @@ -2737,6 +2737,11 @@ s32 e1000_link_stall_workaround_hv(struct e1000_hw *hw) if (hw->phy.type != e1000_phy_82578) goto out; + /* Do not apply workaround if in PHY loopback bit 14 set */ + hw->phy.ops.read_phy_reg(hw, PHY_CONTROL, &data); + if (data & PHY_CONTROL_LB) + goto out; + /* check if link is up and at 1Gbps */ ret_val = hw->phy.ops.read_phy_reg(hw, BM_CS_STATUS, &data); if (ret_val)