linux-kernel - [PATCH net v2 1/1] net: stmmac: xgmac: Disable FPE MMC interrupts

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Message-Id: <20231124015433.2223696-1-0x1207@gmail.com>
Date:   Fri, 24 Nov 2023 09:54:33 +0800
From:   Furong Xu <0x1207@...il.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Joao Pinto <jpinto@...opsys.com>,
        Simon Horman <horms@...nel.org>
Cc:     netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        xfr@...look.com, rock.xu@....com, Furong Xu <0x1207@...il.com>
Subject: [PATCH net v2 1/1] net: stmmac: xgmac: Disable FPE MMC interrupts

Commit aeb18dd07692 ("net: stmmac: xgmac: Disable MMC interrupts
by default") tries to disable MMC interrupts to avoid a storm of
unhandled interrupts, but leaves the FPE(Frame Preemption) MMC
interrupts enabled.
Now we mask FPE TX and RX interrupts to disable all MMC interrupts.

Fixes: aeb18dd07692 ("net: stmmac: xgmac: Disable MMC interrupts by default")
Signed-off-by: Furong Xu <0x1207@...il.com>
---
Changes in v2:
  - Update commit message, thanks Wojciech and Andrew.
---
 drivers/net/ethernet/stmicro/stmmac/mmc_core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/mmc_core.c b/drivers/net/ethernet/stmicro/stmmac/mmc_core.c
index ea4910ae0921..cdd7fbde2bfa 100644
--- a/drivers/net/ethernet/stmicro/stmmac/mmc_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/mmc_core.c
@@ -177,8 +177,10 @@
 #define MMC_XGMAC_RX_DISCARD_OCT_GB	0x1b4
 #define MMC_XGMAC_RX_ALIGN_ERR_PKT	0x1bc
 
+#define MMC_XGMAC_FPE_TX_INTR_MASK	0x204
 #define MMC_XGMAC_TX_FPE_FRAG		0x208
 #define MMC_XGMAC_TX_HOLD_REQ		0x20c
+#define MMC_XGMAC_FPE_RX_INTR_MASK	0x224
 #define MMC_XGMAC_RX_PKT_ASSEMBLY_ERR	0x228
 #define MMC_XGMAC_RX_PKT_SMD_ERR	0x22c
 #define MMC_XGMAC_RX_PKT_ASSEMBLY_OK	0x230
@@ -352,6 +354,8 @@ static void dwxgmac_mmc_intr_all_mask(void __iomem *mmcaddr)
 {
 	writel(0x0, mmcaddr + MMC_RX_INTR_MASK);
 	writel(0x0, mmcaddr + MMC_TX_INTR_MASK);
+	writel(MMC_DEFAULT_MASK, mmcaddr + MMC_XGMAC_FPE_TX_INTR_MASK);
+	writel(MMC_DEFAULT_MASK, mmcaddr + MMC_XGMAC_FPE_RX_INTR_MASK);
 	writel(MMC_DEFAULT_MASK, mmcaddr + MMC_XGMAC_RX_IPC_INTR_MASK);
 }
 
-- 
2.34.1