From: patrick <patrick@openbsd.org>
Date: Wed, 29 Dec 2021 18:48:45 +0000 (+0000)
Subject: PHYs that we want to talk to over SGMII need to be switched into SGMII
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=fe414f1d401bd6463191c827098a263c15575973;p=openbsd

PHYs that we want to talk to over SGMII need to be switched into SGMII
mode for the link to go up.  This is relevant on RJ45 SFPs.

ok sthen@
---

diff --git a/sys/dev/pci/if_em_hw.c b/sys/dev/pci/if_em_hw.c
index 4ee98572be7..37a6b940d13 100644
--- a/sys/dev/pci/if_em_hw.c
+++ b/sys/dev/pci/if_em_hw.c
@@ -31,7 +31,7 @@
 
 *******************************************************************************/
 
-/* $OpenBSD: if_em_hw.c,v 1.111 2021/12/14 10:48:10 patrick Exp $ */
+/* $OpenBSD: if_em_hw.c,v 1.112 2021/12/29 18:48:45 patrick Exp $ */
 /*
  * if_em_hw.c Shared functions for accessing and configuring the MAC
  */
@@ -2342,6 +2342,20 @@ em_copper_link_preconfig(struct em_hw *hw)
 	    hw->mac_type == em_82541 || hw->mac_type == em_82547 ||
 	    hw->mac_type == em_82541_rev_2 || hw->mac_type == em_82547_rev_2)
 		hw->phy_reset_disable = FALSE;
+	if ((hw->mac_type == em_82575 || hw->mac_type == em_82580 ||
+	    hw->mac_type == em_82576 ||
+	    hw->mac_type == em_i210 || hw->mac_type == em_i350) &&
+	    hw->sgmii_active) {
+		/* allow time for SFP cage time to power up phy */
+		msec_delay(300);
+
+		/*
+		 * SFP documentation requires the following to configure the SFP module
+		 * to work on SGMII.  No further documentation is given.
+		 */
+		em_write_phy_reg(hw, 0x1B, 0x8084);
+		em_phy_hw_reset(hw);
+	}
 
 	return E1000_SUCCESS;
 }