linux-kernel - [PATCH AUTOSEL for-4.9 38/53] ixgbe: Configure advertised speeds correctly for KR/KX backplane

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Message-ID: <20171108204940.27321-38-alexander.levin@verizon.com>
Date:   Wed, 8 Nov 2017 20:50:04 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@....verizon.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Don Skidmore <donald.c.skidmore@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@....verizon.com>
Subject: [PATCH AUTOSEL for-4.9 38/53] ixgbe: Configure advertised speeds
 correctly for KR/KX backplane

From: Don Skidmore <donald.c.skidmore@...el.com>

[ Upstream commit 54f6d4c42451dbd2cc7e0f0bd8fc3eddcab511fe ]

This patch ensures that the advertised link speeds are configured
for X553 KR/KX backplane.  Without this patch the link remains at
1G when resuming from low power after being downshifted by LPLU.

Signed-off-by: Don Skidmore <donald.c.skidmore@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
index 7e6b9267ca9d..30cb66d84095 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_x550.c
@@ -1995,12 +1995,11 @@ static s32 ixgbe_setup_kx4_x550em(struct ixgbe_hw *hw)
 /**
  * ixgbe_setup_kr_x550em - Configure the KR PHY
  * @hw: pointer to hardware structure
- *
- * Configures the integrated KR PHY for X550EM_x.
  **/
 static s32 ixgbe_setup_kr_x550em(struct ixgbe_hw *hw)
 {
-	if (hw->mac.type != ixgbe_mac_X550EM_x)
+	/* leave link alone for 2.5G */
+	if (hw->phy.autoneg_advertised & IXGBE_LINK_SPEED_2_5GB_FULL)
 		return 0;
 
 	return ixgbe_setup_kr_speed_x550em(hw, hw->phy.autoneg_advertised);
-- 
2.11.0