netdev - [PATCH net] net: airoha: Fix loopback mode configuration for GDM2 port

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Message-Id: <20251005-airoha-loopback-mode-fix-v1-1-d017f78acf76@kernel.org>
Date: Sun, 05 Oct 2025 09:52:09 -0500
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org, 
 Lorenzo Bianconi <lorenzo@...nel.org>
Subject: [PATCH net] net: airoha: Fix loopback mode configuration for GDM2
 port

Add missing configuration for loopback mode in airhoha_set_gdm2_loopback
routine.

Fixes: 9cd451d414f6e ("net: airoha: Add loopback support for GDM2")
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 drivers/net/ethernet/airoha/airoha_eth.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/airoha/airoha_eth.c b/drivers/net/ethernet/airoha/airoha_eth.c
index 81ea01a652b9c545c348ad6390af8be873a4997f..abe7a23e3ab7a189a3a28007004572719307de90 100644
--- a/drivers/net/ethernet/airoha/airoha_eth.c
+++ b/drivers/net/ethernet/airoha/airoha_eth.c
@@ -1710,7 +1710,9 @@ static void airhoha_set_gdm2_loopback(struct airoha_gdm_port *port)
 	airoha_fe_wr(eth, REG_GDM_RXCHN_EN(2), 0xffff);
 	airoha_fe_rmw(eth, REG_GDM_LPBK_CFG(2),
 		      LPBK_CHAN_MASK | LPBK_MODE_MASK | LPBK_EN_MASK,
-		      FIELD_PREP(LPBK_CHAN_MASK, chan) | LPBK_EN_MASK);
+		      FIELD_PREP(LPBK_CHAN_MASK, chan) |
+		      FIELD_PREP(LPBK_MODE_MASK, 7) |
+		      LPBK_EN_MASK);
 	airoha_fe_rmw(eth, REG_GDM_LEN_CFG(2),
 		      GDM_SHORT_LEN_MASK | GDM_LONG_LEN_MASK,
 		      FIELD_PREP(GDM_SHORT_LEN_MASK, 60) |

---
base-commit: 1b54b0756f051c11f5a5d0fbc1581e0b9a18e2bc
change-id: 20251005-airoha-loopback-mode-fix-3a9c0036017e

Best regards,
-- 
Lorenzo Bianconi <lorenzo@...nel.org>