linux-kernel - [net-next v3 3/3] net: ethernet: mtk_eth_soc: change code to skip first IRQ completely

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Message-ID: <20250615150333.166202-4-linux@fw-web.de>
Date: Sun, 15 Jun 2025 17:03:18 +0200
From: Frank Wunderlich <linux@...web.de>
To: Felix Fietkau <nbd@....name>,
	Sean Wang <sean.wang@...iatek.com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	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>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Frank Wunderlich <frank-w@...lic-files.de>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	Simon Horman <horms@...nel.org>,
	Daniel Golle <daniel@...rotopia.org>
Subject: [net-next v3 3/3] net: ethernet: mtk_eth_soc: change code to skip first IRQ completely

From: Frank Wunderlich <frank-w@...lic-files.de>

On SoCs without MTK_SHARED_INT capability (mt7621 + mt7628) the first
IRQ (eth->irq[0]) was read but never used. Skip reading it now too.

Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 11 ++++++++---
 drivers/net/ethernet/mediatek/mtk_eth_soc.h |  4 ++--
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 9aec67c9c6d7..4d7de282b940 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -3346,10 +3346,15 @@ static int mtk_get_irqs(struct platform_device *pdev, struct mtk_eth *eth)
 		return 0;
 
 	for (i = 0; i < MTK_ETH_IRQ_MAX; i++) {
-		if (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_INT) && i > 0)
-			eth->irq[i] = eth->irq[MTK_ETH_IRQ_SHARED];
+		if (MTK_HAS_CAPS(eth->soc->caps, MTK_SHARED_INT)) {
+			if (i == 0)
+				eth->irq[MTK_ETH_IRQ_SHARED] = platform_get_irq(pdev, i);
+			else
+				eth->irq[i] = eth->irq[MTK_ETH_IRQ_SHARED];
+		} else if (i < 2)  //skip the 1st and 4th IRQ on !MTK_SHARED_INT
+			eth->irq[i] = platform_get_irq(pdev, i + 1);
 		else
-			eth->irq[i] = platform_get_irq(pdev, i);
+			continue;
 
 		if (eth->irq[i] < 0) {
 			dev_err(&pdev->dev, "no IRQ%d resource found\n", i);
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 6b1208d05f79..ff2ae3c80179 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -643,8 +643,8 @@
 #define MTK_MAC_FSM(x)		(0x1010C + ((x) * 0x100))
 
 #define MTK_ETH_IRQ_SHARED	0
-#define MTK_ETH_IRQ_TX		1
-#define MTK_ETH_IRQ_RX		2
+#define MTK_ETH_IRQ_TX		0
+#define MTK_ETH_IRQ_RX		1
 #define MTK_ETH_IRQ_MAX		3
 
 struct mtk_rx_dma {
-- 
2.43.0