patch 'net/igc/base: fix LTR for i225' has been queued to stable release 22.11.8

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 22.11.8

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 02/19/25. 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/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/f65e7af5701cbb5c25d05269a4f5048d8024220e

Thanks.

Luca Boccassi

---
>From f65e7af5701cbb5c25d05269a4f5048d8024220e Mon Sep 17 00:00:00 2001
From: Sasha Neftin <sasha.neftin at intel.com>
Date: Thu, 6 Feb 2025 16:08:29 +0000
Subject: [PATCH] net/igc/base: fix LTR for i225

[ upstream commit 6a304bc65269cfd86193663e9b94c73299b54d00 ]

i225 specification recommends minus 1 microsecond from a value
calculated for a LTR. Fix the calculation to match spec.

Fixes: 8cb7c57d9b3c ("net/igc: support device initialization")

Signed-off-by: Sasha Neftin <sasha.neftin at intel.com>
Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
Acked-by: Bruce Richardson <bruce.richardson at intel.com>
---
 drivers/net/igc/base/igc_i225.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/igc/base/igc_i225.c b/drivers/net/igc/base/igc_i225.c
index 25cd2a8039..a6f0ac0612 100644
--- a/drivers/net/igc/base/igc_i225.c
+++ b/drivers/net/igc/base/igc_i225.c
@@ -1068,7 +1068,9 @@ static s32 igc_set_ltr_i225(struct igc_hw *hw, bool link)
 		scale_max = (ltr_max / 1024) < 1024 ? IGC_LTRMAXV_SCALE_1024 :
 			    IGC_LTRMAXV_SCALE_32768;
 		ltr_min /= scale_min == IGC_LTRMINV_SCALE_1024 ? 1024 : 32768;
+		ltr_min -= 1;
 		ltr_max /= scale_max == IGC_LTRMAXV_SCALE_1024 ? 1024 : 32768;
+		ltr_max -= 1;
 
 		/* Only write the LTR thresholds if they differ from before. */
 		ltrv = IGC_READ_REG(hw, IGC_LTRMINV);
-- 
2.47.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2025-02-17 16:13:18.246653784 +0000
+++ 0039-net-igc-base-fix-LTR-for-i225.patch	2025-02-17 16:13:16.838441592 +0000
@@ -1 +1 @@
-From 6a304bc65269cfd86193663e9b94c73299b54d00 Mon Sep 17 00:00:00 2001
+From f65e7af5701cbb5c25d05269a4f5048d8024220e Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 6a304bc65269cfd86193663e9b94c73299b54d00 ]
+
@@ -10 +11,0 @@
-Cc: stable at dpdk.org
@@ -16 +17 @@
- drivers/net/intel/igc/base/igc_i225.c | 2 ++
+ drivers/net/igc/base/igc_i225.c | 2 ++
@@ -19,5 +20,5 @@
-diff --git a/drivers/net/intel/igc/base/igc_i225.c b/drivers/net/intel/igc/base/igc_i225.c
-index 003c060215..e701d00f80 100644
---- a/drivers/net/intel/igc/base/igc_i225.c
-+++ b/drivers/net/intel/igc/base/igc_i225.c
-@@ -1071,7 +1071,9 @@ static s32 igc_set_ltr_i225(struct igc_hw *hw, bool link)
+diff --git a/drivers/net/igc/base/igc_i225.c b/drivers/net/igc/base/igc_i225.c
+index 25cd2a8039..a6f0ac0612 100644
+--- a/drivers/net/igc/base/igc_i225.c
++++ b/drivers/net/igc/base/igc_i225.c
+@@ -1068,7 +1068,9 @@ static s32 igc_set_ltr_i225(struct igc_hw *hw, bool link)