From: Rodrigo Cataldo <rodrigo.cadore@l-acoustics.com>
Date: Fri, 8 Dec 2023 14:58:16 +0000 (+0100)
Subject: igc: Fix hicredit calculation
X-Git-Tag: v6.6.17~1593
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1d95d871f907e9f355949451252ec45f8515bb6f;p=platform%2Fkernel%2Flinux-rpi.git

igc: Fix hicredit calculation

[ Upstream commit 947dfc8138dfaeb6e966e2d661de89eb203e3064 ]

According to the Intel Software Manual for I225, Section 7.5.2.7,
hicredit should be multiplied by the constant link-rate value, 0x7736.

Currently, the old constant link-rate value, 0x7735, from the boards
supported on igb are being used, most likely due to a copy'n'paste, as
the rest of the logic is the same for both drivers.

Update hicredit accordingly.

Fixes: 1ab011b0bf07 ("igc: Add support for CBS offloading")
Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de>
Signed-off-by: Rodrigo Cataldo <rodrigo.cadore@l-acoustics.com>
Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Tested-by: Naama Meir <naamax.meir@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/net/ethernet/intel/igc/igc_tsn.c b/drivers/net/ethernet/intel/igc/igc_tsn.c
index a9c0832..22cefb1 100644
--- a/drivers/net/ethernet/intel/igc/igc_tsn.c
+++ b/drivers/net/ethernet/intel/igc/igc_tsn.c
@@ -227,7 +227,7 @@ static int igc_tsn_enable_offload(struct igc_adapter *adapter)
 			wr32(IGC_TQAVCC(i), tqavcc);
 
 			wr32(IGC_TQAVHC(i),
-			     0x80000000 + ring->hicredit * 0x7735);
+			     0x80000000 + ring->hicredit * 0x7736);
 		} else {
 			/* Disable any CBS for the queue */
 			txqctl &= ~(IGC_TXQCTL_QAV_SEL_MASK);