From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from shout02.mail.de (shout02.mail.de [62.201.172.25]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0C744320CAD; Mon, 20 Jul 2026 11:16:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=62.201.172.25 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784546189; cv=none; b=Cs/3Q8jJuEFVxMlDEd8naeKUq2T5B69D6+qDMapOx0WEJWydvbKM3kVwm7c3lduZigCURrdJrkHXi04MCqVRsYXZ8AY+e2i9TdL2TQmJsX5IRjRQndUnAV2T8mwN12VfglU0WxcdC9NNu5n3AwENyrEuoxZI3kpcPlkxTLDnG0I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784546189; c=relaxed/simple; bh=yK35+AhI3nm/v2z8NTIxfVsSX/APoUmq4QmgKb0ner4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=GP8BMTzirClG9b2lBqWpoBAuoKkuIeloUqHVBfq4zjbkEWRSU0xKWmGyEypArIMmuZPP7bPIPc6wvp9H4LDVwyCEcwvRX9mir0ZVpisDKrVkmbQ/uj2nUT6DvJhTt3u8tvzU9m0UCGdAuyfC/KuEqxIpzy55OU89C90RnpkYa6E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mail.de; spf=pass smtp.mailfrom=mail.de; dkim=pass (2048-bit key) header.d=mail.de header.i=@mail.de header.b=iudP4IyO; arc=none smtp.client-ip=62.201.172.25 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mail.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mail.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mail.de header.i=@mail.de header.b="iudP4IyO" Received: from postfix02.mail.de (postfix02.bt.mail.de [10.0.121.126]) by shout02.mail.de (Postfix) with ESMTP id 3F0B02406E8; Mon, 20 Jul 2026 13:16:20 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mail.de; s=mailde202009; t=1784546180; bh=yK35+AhI3nm/v2z8NTIxfVsSX/APoUmq4QmgKb0ner4=; h=From:To:Cc:Subject:Date:Message-ID:From:To:CC:Subject:Reply-To; b=iudP4IyOkJIL8WarI/TuDlHt61QXpInji5C6sg5IzEIfBkHGrjABNIn/0B0RNVswU b55GrtgMdUtHaYRTepddAkPKW3kacxgH9vjD8g/ZCZMYfOT5Uwj3RpCYbu2dZjh07o i7Cn4PV5xyjWhkLgcrQH5ax9yJVgWjI6pVh0QQ2ng7YSy8mPwzAw5tDFDDinoLWyRZ LWGsvAl/HYSYVObUANqRk+MCazvJRlGV7NSQcHsGTjkICUkC3fcXWMrgj103hynz3x IkDqJYXBBDwQG5O2CpEN9RUYCusXzY1PNtZyFFjxt9pWWuvScCYBU6h/IEtndE/r9q QncxIAL+wLjLw== Received: from smtp01.mail.de (smtp02.bt.mail.de [10.0.121.212]) by postfix02.mail.de (Postfix) with ESMTP id 011262405A7; Mon, 20 Jul 2026 13:16:19 +0200 (CEST) Received: from [127.0.0.1] (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp01.mail.de (Postfix) with ESMTPSA id 64B73240604; Mon, 20 Jul 2026 13:16:14 +0200 (CEST) From: Luis Lang To: netdev@vger.kernel.org Cc: Luis Lang , Andrew Lunn , Maxime Chevallier , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Maxime Coquelin , Alexandre Torgue , "Russell King (Oracle)" , Oleksij Rempel , Ovidiu Panait , Rohan G Thomas , linux-stm32@st-md-mailman.stormreply.com (moderated list:ARM/STM32 ARCHITECTURE), linux-arm-kernel@lists.infradead.org (moderated list:ARM/STM32 ARCHITECTURE), linux-kernel@vger.kernel.org (open list) Subject: [PATCH net v2] net: stmmac: dwmac4: mask interrupts when stopping DMA in suspend Date: Mon, 20 Jul 2026 13:15:29 +0200 Message-ID: <20260720111534.163416-1-luis.la@mail.de> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-purgate: clean X-purgate: This mail is considered clean (visit http://www.eleven.de for further information) X-purgate-type: clean X-purgate-Ad: Categorized by eleven eXpurgate (R) https://www.eleven.de X-purgate: This mail is considered clean (visit https://www.eleven.de for further information) X-purgate: clean X-purgate-size: 5154 X-purgate-ID: 154282::1784546179-3DC66780-1C876AB0/0/0 Since commit 1b9707e6f1a9 ("net: stmmac: enable RPS and RBU interrupts"), suspending causes an interrupt storm from the RPS interrupt. Fix this by adding a deinit_chan() op to stmmac_dma_ops, which masks all default dma channel interrupts. This is called from stmmac_stop_all_dma(), so interrupts don't trigger while suspending. Fixes: 1b9707e6f1a9 ("net: stmmac: enable RPS and RBU interrupts") Suggested-by: Andrew Lunn Suggested-by: Maxime Chevallier Signed-off-by: Luis Lang --- .../net/ethernet/stmicro/stmmac/dwmac4_dma.c | 24 +++++++++++++++++++ drivers/net/ethernet/stmicro/stmmac/hwif.h | 4 ++++ .../net/ethernet/stmicro/stmmac/stmmac_main.c | 4 ++++ 3 files changed, 32 insertions(+) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c index 829a23bdad01..23ffe1adcd0d 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c @@ -106,6 +106,17 @@ static void dwmac4_dma_init_channel(struct stmmac_priv *priv, ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan)); } +static void dwmac4_dma_deinit_channel(struct stmmac_priv *priv, + void __iomem *ioaddr, u32 chan) +{ + const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs; + u32 value; + + value = readl(ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan)); + value &= ~DMA_CHAN_INTR_DEFAULT_MASK; + writel(value, ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan)); +} + static void dwmac410_dma_init_channel(struct stmmac_priv *priv, void __iomem *ioaddr, struct stmmac_dma_cfg *dma_cfg, u32 chan) @@ -125,6 +136,17 @@ static void dwmac410_dma_init_channel(struct stmmac_priv *priv, ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan)); } +static void dwmac410_dma_deinit_channel(struct stmmac_priv *priv, + void __iomem *ioaddr, u32 chan) +{ + const struct dwmac4_addrs *dwmac4_addrs = priv->plat->dwmac4_addrs; + u32 value; + + value = readl(ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan)); + value &= ~DMA_CHAN_INTR_DEFAULT_MASK_4_10; + writel(value, ioaddr + DMA_CHAN_INTR_ENA(dwmac4_addrs, chan)); +} + static void dwmac4_dma_init(void __iomem *ioaddr, struct stmmac_dma_cfg *dma_cfg) { @@ -548,6 +570,7 @@ const struct stmmac_dma_ops dwmac4_dma_ops = { .reset = dwmac4_dma_reset, .init = dwmac4_dma_init, .init_chan = dwmac4_dma_init_channel, + .deinit_chan = dwmac4_dma_deinit_channel, .init_rx_chan = dwmac4_dma_init_rx_chan, .init_tx_chan = dwmac4_dma_init_tx_chan, .axi = dwmac4_dma_axi, @@ -577,6 +600,7 @@ const struct stmmac_dma_ops dwmac410_dma_ops = { .reset = dwmac4_dma_reset, .init = dwmac4_dma_init, .init_chan = dwmac410_dma_init_channel, + .deinit_chan = dwmac410_dma_deinit_channel, .init_rx_chan = dwmac4_dma_init_rx_chan, .init_tx_chan = dwmac4_dma_init_tx_chan, .axi = dwmac4_dma_axi, diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h index e6317b94fff7..04dafec021b4 100644 --- a/drivers/net/ethernet/stmicro/stmmac/hwif.h +++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h @@ -170,6 +170,8 @@ struct stmmac_dma_ops { void (*init)(void __iomem *ioaddr, struct stmmac_dma_cfg *dma_cfg); void (*init_chan)(struct stmmac_priv *priv, void __iomem *ioaddr, struct stmmac_dma_cfg *dma_cfg, u32 chan); + void (*deinit_chan)(struct stmmac_priv *priv, void __iomem *ioaddr, + u32 chan); void (*init_rx_chan)(struct stmmac_priv *priv, void __iomem *ioaddr, struct stmmac_dma_cfg *dma_cfg, dma_addr_t phy, u32 chan); @@ -235,6 +237,8 @@ struct stmmac_dma_ops { stmmac_do_void_callback(__priv, dma, init, __args) #define stmmac_init_chan(__priv, __args...) \ stmmac_do_void_callback(__priv, dma, init_chan, __priv, __args) +#define stmmac_deinit_chan(__priv, __args...) \ + stmmac_do_void_callback(__priv, dma, deinit_chan, __priv, __args) #define stmmac_init_rx_chan(__priv, __args...) \ stmmac_do_void_callback(__priv, dma, init_rx_chan, __priv, __args) #define stmmac_init_tx_chan(__priv, __args...) \ diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 2a0d7eff88d3..af29a50ddb89 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -2560,6 +2560,7 @@ static void stmmac_stop_all_dma(struct stmmac_priv *priv) { u8 rx_channels_count = priv->plat->rx_queues_to_use; u8 tx_channels_count = priv->plat->tx_queues_to_use; + u8 dma_csr_ch = max(rx_channels_count, tx_channels_count); u8 chan; for (chan = 0; chan < rx_channels_count; chan++) @@ -2567,6 +2568,9 @@ static void stmmac_stop_all_dma(struct stmmac_priv *priv) for (chan = 0; chan < tx_channels_count; chan++) stmmac_stop_tx_dma(priv, chan); + + for (chan = 0; chan < dma_csr_ch; chan++) + stmmac_deinit_chan(priv, priv->ioaddr, chan); } /** -- 2.55.0