patch 'net/igc/base: fix LTR for i225' has been queued to stable release 23.11.4

[Xueming Li]

Hi,

FYI, your patch has been queued to stable release 23.11.4

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
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://git.dpdk.org/dpdk-stable/log/?h=23.11-staging

This queued commit can be viewed at:
https://git.dpdk.org/dpdk-stable/commit/?h=23.11-staging&id=c6cf6d3f9760c8788b2fb76f4eff1f42b41aace7

Thanks.

Xueming Li <xuemingl at nvidia.com>

---
>From c6cf6d3f9760c8788b2fb76f4eff1f42b41aace7 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
Cc: Xueming Li <xuemingl at nvidia.com>

[ 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 003c060215..e701d00f80 100644
--- a/drivers/net/igc/base/igc_i225.c
+++ b/drivers/net/igc/base/igc_i225.c
@@ -1071,7 +1071,9 @@ 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);
--
2.34.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2025-02-18 19:39:02.512308323 +0800
+++ 0050-net-igc-base-fix-LTR-for-i225.patch	2025-02-18 19:39:00.638244046 +0800
@@ -1 +1 @@
-From 6a304bc65269cfd86193663e9b94c73299b54d00 Mon Sep 17 00:00:00 2001
+From c6cf6d3f9760c8788b2fb76f4eff1f42b41aace7 Mon Sep 17 00:00:00 2001
@@ -4,0 +5,3 @@
+Cc: Xueming Li <xuemingl at nvidia.com>
+
+[ upstream commit 6a304bc65269cfd86193663e9b94c73299b54d00 ]
@@ -10 +12,0 @@
-Cc: stable at dpdk.org
@@ -16 +18 @@
- drivers/net/intel/igc/base/igc_i225.c | 2 ++
+ drivers/net/igc/base/igc_i225.c | 2 ++
@@ -19 +21 @@
-diff --git a/drivers/net/intel/igc/base/igc_i225.c b/drivers/net/intel/igc/base/igc_i225.c
+diff --git a/drivers/net/igc/base/igc_i225.c b/drivers/net/igc/base/igc_i225.c
@@ -21,2 +23,2 @@
---- a/drivers/net/intel/igc/base/igc_i225.c
-+++ b/drivers/net/intel/igc/base/igc_i225.c
+--- a/drivers/net/igc/base/igc_i225.c
++++ b/drivers/net/igc/base/igc_i225.c