linux-kernel - [PATCH net v2 3/4] net: stmmac: dwmac4: Receive Watchdog Timeout is not in abnormal interrupt summary

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Message-ID: <20241016031832.3701260-4-leyfoon.tan@starfivetech.com>
Date: Wed, 16 Oct 2024 11:18:31 +0800
From: Ley Foon Tan <leyfoon.tan@...rfivetech.com>
To: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>
Cc: "David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lftan.linux@...i.com
Subject: [PATCH net v2 3/4] net: stmmac: dwmac4: Receive Watchdog Timeout is not in abnormal interrupt summary

The Receive Watchdog Timeout (RWT, bit[9]) is not part of Abnormal
Interrupt Summary (AIS). Move the RWT handling out of the AIS
condition statement.

>From databook, the AIS is the logical OR of the following interrupt bits:

- Bit 1: Transmit Process Stopped
- Bit 7: Receive Buffer Unavailable
- Bit 8: Receive Process Stopped
- Bit 10: Early Transmit Interrupt
- Bit 12: Fatal Bus Error
- Bit 13: Context Descriptor Error

Fixes: 48863ce5940f ("stmmac: add DMA support for GMAC 4.xx")
Signed-off-by: Ley Foon Tan <leyfoon.tan@...rfivetech.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
index 0d185e54eb7e..57c03d491774 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_lib.c
@@ -185,8 +185,6 @@ int dwmac4_dma_interrupt(struct stmmac_priv *priv, void __iomem *ioaddr,
 			x->rx_buf_unav_irq++;
 		if (unlikely(intr_status & DMA_CHAN_STATUS_RPS))
 			x->rx_process_stopped_irq++;
-		if (unlikely(intr_status & DMA_CHAN_STATUS_RWT))
-			x->rx_watchdog_irq++;
 		if (unlikely(intr_status & DMA_CHAN_STATUS_ETI))
 			x->tx_early_irq++;
 		if (unlikely(intr_status & DMA_CHAN_STATUS_TPS)) {
@@ -198,6 +196,10 @@ int dwmac4_dma_interrupt(struct stmmac_priv *priv, void __iomem *ioaddr,
 			ret = tx_hard_error;
 		}
 	}
+
+	if (unlikely(intr_status & DMA_CHAN_STATUS_RWT))
+		x->rx_watchdog_irq++;
+
 	/* TX/RX NORMAL interrupts */
 	if (likely(intr_status & DMA_CHAN_STATUS_RI)) {
 		u64_stats_update_begin(&stats->syncp);
-- 
2.34.1