netdev - [PATCH net-next 4/6] net: stmmac: move stmmac_axi_blen_to_mask() to stmmac

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Message-Id: <E1vLfLW-0000000FMb1-0zKV@rmk-PC.armlinux.org.uk>
Date: Wed, 19 Nov 2025 10:23:30 +0000
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-stm32@...md-mailman.stormreply.com,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next 4/6] net: stmmac: move stmmac_axi_blen_to_mask() to
 stmmac_main.c

Move the call to stmmac_axi_blen_to_mask() out of the individual
MAC version drivers into the main code in stmmac_init_dma_engine(),
passing the resulting value through a new member, axi_blen_regval,
in the struct stmmac_axi structure.

There is now no need for stmmac_axi_blen_to_dma_mask() to use
u32p_replace_bits(), so use FIELD_PREP() instead.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c | 3 +--
 drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c    | 3 +--
 drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c  | 3 +--
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c   | 8 ++++++--
 include/linux/stmmac.h                              | 1 +
 5 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
index b6476a1bfeab..6d9b8fac3c6d 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
@@ -41,8 +41,7 @@ static void dwmac1000_dma_axi(void __iomem *ioaddr, struct stmmac_axi *axi)
 	 * set). Note that the UNDEF bit is readonly, and is the inverse of
 	 * Bus Mode bit 16.
 	 */
-	stmmac_axi_blen_to_mask(&value, axi->axi_blen,
-				ARRAY_SIZE(axi->axi_blen));
+	value = (value & ~DMA_AXI_BLEN_MASK) | axi->axi_blen_regval;
 
 	writel(value, ioaddr + DMA_AXI_BUS_MODE);
 }
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
index 90d03c7b29f4..7b513324cfb0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
@@ -40,8 +40,7 @@ static void dwmac4_dma_axi(void __iomem *ioaddr, struct stmmac_axi *axi)
 	 * set). Note that the UNDEF bit is readonly, and is the inverse of
 	 * Bus Mode bit 16.
 	 */
-	stmmac_axi_blen_to_mask(&value, axi->axi_blen,
-				ARRAY_SIZE(axi->axi_blen));
+	value = (value & ~DMA_AXI_BLEN_MASK) | axi->axi_blen_regval;
 
 	writel(value, ioaddr + DMA_SYS_BUS_MODE);
 }
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
index 8a2cb6ca9588..cc1bdc0975d5 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
@@ -106,8 +106,7 @@ static void dwxgmac2_dma_axi(void __iomem *ioaddr, struct stmmac_axi *axi)
 	 * set). Note that the UNDEF bit is readonly, and is the inverse of
 	 * Bus Mode bit 16.
 	 */
-	stmmac_axi_blen_to_mask(&value, axi->axi_blen,
-				ARRAY_SIZE(axi->axi_blen));
+	value = (value & ~DMA_AXI_BLEN_MASK) | axi->axi_blen_regval;
 
 	writel(value, ioaddr + XGMAC_DMA_SYSBUS_MODE);
 	writel(XGMAC_TDPS, ioaddr + XGMAC_TX_EDMA_CTRL);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index e5ed61154557..99a7d4c463d9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -223,7 +223,7 @@ void stmmac_axi_blen_to_mask(u32 *regval, const u32 *blen, size_t len)
 		val |= burst >> 2;
 	}
 
-	u32p_replace_bits(regval, val, DMA_AXI_BLEN_MASK);
+	*regval = FIELD_PREP(DMA_AXI_BLEN_MASK, val);
 }
 
 /**
@@ -3212,8 +3212,12 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
 	/* DMA Configuration */
 	stmmac_dma_init(priv, priv->ioaddr, priv->plat->dma_cfg);
 
-	if (priv->plat->axi)
+	if (priv->plat->axi) {
+		/* Encode the AXI burst length to a register value */
+		stmmac_axi_blen_to_mask(&priv->plat->axi->axi_blen_regval,
+					priv->plat->axi->axi_blen, AXI_BLEN);
 		stmmac_axi(priv, priv->ioaddr, priv->plat->axi);
+	}
 
 	/* DMA CSR Channel configuration */
 	for (chan = 0; chan < dma_csr_ch; chan++) {
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index 673b068fdadf..d1a41fe0825f 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -113,6 +113,7 @@ struct stmmac_axi {
 	u32 axi_wr_osr_lmt;
 	u32 axi_rd_osr_lmt;
 	bool axi_kbbe;
+	u32 axi_blen_regval;
 	u32 axi_blen[AXI_BLEN];
 	bool axi_fb;
 	bool axi_mb;
-- 
2.47.3