e1000e: Resolve intermittent negotiation issue on 82574/82583.
For 82574 and 82583 devices, resolve an intermittent link issue where
the link negotiates to 100Mbps rather than 1Gbps when powering off the
PHY and powering on the PHY after several seconds.
Signed-off-by: Matthew Vick <matthew.vick@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/e1000e/phy.c b/drivers/net/ethernet/intel/e1000e/phy.c
index bd5ef64..ad22b8c 100644
--- a/drivers/net/ethernet/intel/e1000e/phy.c
+++ b/drivers/net/ethernet/intel/e1000e/phy.c
@@ -722,8 +722,24 @@
phy_data |= M88E1000_PSCR_POLARITY_REVERSAL;
/* Enable downshift on BM (disabled by default) */
- if (phy->type == e1000_phy_bm)
+ if (phy->type == e1000_phy_bm) {
+ /* For 82574/82583, first disable then enable downshift */
+ if (phy->id == BME1000_E_PHY_ID_R2) {
+ phy_data &= ~BME1000_PSCR_ENABLE_DOWNSHIFT;
+ ret_val = e1e_wphy(hw, M88E1000_PHY_SPEC_CTRL,
+ phy_data);
+ if (ret_val)
+ return ret_val;
+ /* Commit the changes. */
+ ret_val = e1000e_commit_phy(hw);
+ if (ret_val) {
+ e_dbg("Error committing the PHY changes\n");
+ return ret_val;
+ }
+ }
+
phy_data |= BME1000_PSCR_ENABLE_DOWNSHIFT;
+ }
ret_val = e1e_wphy(hw, M88E1000_PHY_SPEC_CTRL, phy_data);
if (ret_val)