patch 'net/e1000/base: clear DPG enable bit post MAC reset' has been queued to stable release 25.11.3

[Kevin Traynor]

Hi,

FYI, your patch has been queued to stable release 25.11.3

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 07/27/26. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/kevintraynor/dpdk-stable

This queued commit can be viewed at:
https://github.com/kevintraynor/dpdk-stable/commit/b809d7377525319a61874284a6bdb81eb27f9f65

Thanks.

Kevin

---
>From b809d7377525319a61874284a6bdb81eb27f9f65 Mon Sep 17 00:00:00 2001
From: Vitaly Lifshits <vitaly.lifshits at intel.com>
Date: Wed, 20 May 2026 12:52:42 +0000
Subject: [PATCH] net/e1000/base: clear DPG enable bit post MAC reset

[ upstream commit bd72896afb32e6326e79c68737054580551cdaa4 ]

The GbE autonomous power gating feature was added to support G3 to S5
flow. However, this changed the reset value of DPG_EN bit to 1, causing
a possible autonomous transition to power gating state during D0. This
might result in undefined errors such as: packet loss, packet corruption
and Tx/Rx hangs. Therefore, clear DPG_EN bit after hardware reset flow.

Fixes: 5a32a257f957 ("e1000: more NICs in base driver")

Signed-off-by: Vitaly Lifshits <vitaly.lifshits at intel.com>
Signed-off-by: Ciara Loftus <ciara.loftus at intel.com>
Acked-by: Bruce Richardson <bruce.richardson at intel.com>
---
 drivers/net/intel/e1000/base/e1000_defines.h | 1 +
 drivers/net/intel/e1000/base/e1000_ich8lan.c | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/net/intel/e1000/base/e1000_defines.h b/drivers/net/intel/e1000/base/e1000_defines.h
index eb93675823..6c710300a6 100644
--- a/drivers/net/intel/e1000/base/e1000_defines.h
+++ b/drivers/net/intel/e1000/base/e1000_defines.h
@@ -37,4 +37,5 @@
 /* Extended Device Control */
 #define E1000_CTRL_EXT_LPCD		0x00000004 /* LCD Power Cycle Done */
+#define E1000_CTRL_EXT_DPG_EN		0x00000008 /* Dynamic Power Gating Enable */
 #define E1000_CTRL_EXT_SDP4_DATA	0x00000010 /* SW Definable Pin 4 data */
 #define E1000_CTRL_EXT_SDP6_DATA	0x00000040 /* SW Definable Pin 6 data */
diff --git a/drivers/net/intel/e1000/base/e1000_ich8lan.c b/drivers/net/intel/e1000/base/e1000_ich8lan.c
index 6190052368..96b9ad6a70 100644
--- a/drivers/net/intel/e1000/base/e1000_ich8lan.c
+++ b/drivers/net/intel/e1000/base/e1000_ich8lan.c
@@ -5108,4 +5108,11 @@ STATIC s32 e1000_reset_hw_ich8lan(struct e1000_hw *hw)
 	E1000_WRITE_REG(hw, E1000_KABGTXD, reg);
 
+	if (hw->mac.type >= e1000_pch_ptp) {
+		DEBUGOUT("Clearing DPG EN bit post reset\n");
+		reg = E1000_READ_REG(hw, E1000_CTRL_EXT);
+		reg &= ~E1000_CTRL_EXT_DPG_EN;
+		E1000_WRITE_REG(hw, E1000_CTRL_EXT, reg);
+	}
+
 	return E1000_SUCCESS;
 }
-- 
2.55.0

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2026-07-23 17:58:00.419561621 +0100
+++ 0061-net-e1000-base-clear-DPG-enable-bit-post-MAC-reset.patch	2026-07-23 17:57:58.678918561 +0100
@@ -1 +1 @@
-From bd72896afb32e6326e79c68737054580551cdaa4 Mon Sep 17 00:00:00 2001
+From b809d7377525319a61874284a6bdb81eb27f9f65 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit bd72896afb32e6326e79c68737054580551cdaa4 ]
+
@@ -13 +14,0 @@
-Cc: stable at dpdk.org