From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pidgin.makrotopia.org (pidgin.makrotopia.org [185.142.180.65]) (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 E98BC3655CC; Wed, 10 Jun 2026 19:55:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.142.180.65 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781121342; cv=none; b=Xh8j6DGgugbaYh4Of+XqnZQhOEVjY9xSRog9uWkqNRQc5rnlu94SJl+jk1h+dnjJU/q9YXwa/YRrAa3IcLinwAHu0Rn+y0WCn+a3NKRT1bFmcjBHVToLpvNtrliaai6O5Bt4Xg+UuXXReISgAnBXXv9rkHzP7oHMGSetafKM5sA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781121342; c=relaxed/simple; bh=wVZX4/DnjO+GwycXy6qrdtkybpX5RSVyIGP/2hnI3+g=; h=Date:From:To:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=tIVu78eXGDqmbsOqUmY8ABSBsB0RSR9XccXupjM9E3tZWjPYkCrzaH3X6FTfVeOtdE4hyA+gjoKWXpHY/+9InXXTaVs1grhkw/FnsWA9LMGW9xCaRLjs9lEhfQ2H3focxafxAonhq2Q5xoyigHS+QRMtgCjm/u4Y62Jf0A9/UtY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=makrotopia.org; spf=pass smtp.mailfrom=makrotopia.org; arc=none smtp.client-ip=185.142.180.65 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=makrotopia.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=makrotopia.org Received: from local by pidgin.makrotopia.org with esmtpsa (TLS1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.99) (envelope-from ) id 1wXP1T-000000000EO-0oub; Wed, 10 Jun 2026 19:55:35 +0000 Date: Wed, 10 Jun 2026 20:55:32 +0100 From: Daniel Golle To: "Chester A. Unal" , Daniel Golle , Andrew Lunn , Vladimir Oltean , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Matthias Brugger , AngeloGioacchino Del Regno , Russell King , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Subject: [PATCH net-next 1/8] net: dsa: mt7530: move MDIO bus locking into regmap Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: The switch register regmap was created with .disable_locking = true, relying on callers to manually lock the MDIO bus. Move the locking into the regmap using .lock/.unlock callbacks, matching the PCS regmaps that already do this. This allows any code path reaching the regmap to be automatically protected. With regmap handling bus locking, the manual mt7530_mutex_lock/unlock wrappers in mt7530_write(), _mt7530_read(), mt7530_rmw() and mt7530_port_change_mtu() become redundant and are removed. The MT7531 indirect PHY access functions need serialization of their multi-step register sequences, but no longer need to hold bus->mdio_lock across the whole operation. Switch them to reg_mutex. core_write()/core_rmw() are the only remaining callers of mt7530_mutex_lock(). They access TRGMII core PHY registers via the clause 22 MMD indirect protocol -- a separate register space that bypasses regmap and needs manual bus->mdio_lock protection. Generated using the following semantic patch: // Remove mt7530_mutex_lock/unlock around single regmap-based calls. @@ expression priv, reg, val; @@ { - mt7530_mutex_lock(priv); - mt7530_mii_write(priv, reg, val); - - mt7530_mutex_unlock(priv); } @@ expression priv, reg, mask, set; @@ { - mt7530_mutex_lock(priv); - regmap_update_bits(priv->regmap, reg, mask, set); - - mt7530_mutex_unlock(priv); } @@ expression p; identifier val; @@ { - u32 val; - mt7530_mutex_lock(p->priv); - val = mt7530_mii_read(p->priv, p->reg); - mt7530_mutex_unlock(p->priv); - return val; + return mt7530_mii_read(p->priv, p->reg); } @@ expression priv; @@ - mt7530_mutex_lock(priv); val = mt7530_mii_read(priv, MT7530_GMACCR); ... mt7530_mii_write(priv, MT7530_GMACCR, val); - mt7530_mutex_unlock(priv); @@ expression priv, port; @@ INIT_MT7530_DUMMY_POLL(&p, priv, MT7531_PHY_IAC); - mt7530_mutex_lock(priv); + mutex_lock(&priv->reg_mutex); @@ expression priv; @@ out: - mt7530_mutex_unlock(priv); + mutex_unlock(&priv->reg_mutex); Signed-off-by: Daniel Golle --- drivers/net/dsa/mt7530-mdio.c | 9 ++++++--- drivers/net/dsa/mt7530.c | 38 +++++++++-------------------------- 2 files changed, 15 insertions(+), 32 deletions(-) diff --git a/drivers/net/dsa/mt7530-mdio.c b/drivers/net/dsa/mt7530-mdio.c index 11ea924a9f35..f7c8eeb27211 100644 --- a/drivers/net/dsa/mt7530-mdio.c +++ b/drivers/net/dsa/mt7530-mdio.c @@ -141,12 +141,14 @@ static const struct regmap_config regmap_config = { .val_bits = 32, .reg_stride = 4, .max_register = MT7530_CREV, - .disable_locking = true, + .lock = mt7530_mdio_regmap_lock, + .unlock = mt7530_mdio_regmap_unlock, }; static int mt7530_probe(struct mdio_device *mdiodev) { + struct regmap_config rc = regmap_config; struct mt7530_priv *priv; struct device_node *dn; int ret; @@ -200,8 +202,9 @@ mt7530_probe(struct mdio_device *mdiodev) return PTR_ERR(priv->io_pwr); } - priv->regmap = devm_regmap_init(priv->dev, &mt7530_regmap_bus, priv, - ®map_config); + rc.lock_arg = &priv->bus->mdio_lock; + priv->regmap = devm_regmap_init(priv->dev, &mt7530_regmap_bus, + priv, &rc); if (IS_ERR(priv->regmap)) return PTR_ERR(priv->regmap); diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c index 3c2a3029b10c..5f56a423b147 100644 --- a/drivers/net/dsa/mt7530.c +++ b/drivers/net/dsa/mt7530.c @@ -184,11 +184,7 @@ mt7530_mii_read(struct mt7530_priv *priv, u32 reg) static void mt7530_write(struct mt7530_priv *priv, u32 reg, u32 val) { - mt7530_mutex_lock(priv); - mt7530_mii_write(priv, reg, val); - - mt7530_mutex_unlock(priv); } static u32 @@ -200,15 +196,7 @@ _mt7530_unlocked_read(struct mt7530_dummy_poll *p) static u32 _mt7530_read(struct mt7530_dummy_poll *p) { - u32 val; - - mt7530_mutex_lock(p->priv); - - val = mt7530_mii_read(p->priv, p->reg); - - mt7530_mutex_unlock(p->priv); - - return val; + return mt7530_mii_read(p->priv, p->reg); } static u32 @@ -224,11 +212,7 @@ static void mt7530_rmw(struct mt7530_priv *priv, u32 reg, u32 mask, u32 set) { - mt7530_mutex_lock(priv); - regmap_update_bits(priv->regmap, reg, mask, set); - - mt7530_mutex_unlock(priv); } static void @@ -555,7 +539,7 @@ mt7531_ind_c45_phy_read(struct mt7530_priv *priv, int port, int devad, INIT_MT7530_DUMMY_POLL(&p, priv, MT7531_PHY_IAC); - mt7530_mutex_lock(priv); + mutex_lock(&priv->reg_mutex); ret = readx_poll_timeout(_mt7530_unlocked_read, &p, val, !(val & MT7531_PHY_ACS_ST), 20, 100000); @@ -588,7 +572,7 @@ mt7531_ind_c45_phy_read(struct mt7530_priv *priv, int port, int devad, ret = val & MT7531_MDIO_RW_DATA_MASK; out: - mt7530_mutex_unlock(priv); + mutex_unlock(&priv->reg_mutex); return ret; } @@ -603,7 +587,7 @@ mt7531_ind_c45_phy_write(struct mt7530_priv *priv, int port, int devad, INIT_MT7530_DUMMY_POLL(&p, priv, MT7531_PHY_IAC); - mt7530_mutex_lock(priv); + mutex_lock(&priv->reg_mutex); ret = readx_poll_timeout(_mt7530_unlocked_read, &p, val, !(val & MT7531_PHY_ACS_ST), 20, 100000); @@ -635,7 +619,7 @@ mt7531_ind_c45_phy_write(struct mt7530_priv *priv, int port, int devad, } out: - mt7530_mutex_unlock(priv); + mutex_unlock(&priv->reg_mutex); return ret; } @@ -649,7 +633,7 @@ mt7531_ind_c22_phy_read(struct mt7530_priv *priv, int port, int regnum) INIT_MT7530_DUMMY_POLL(&p, priv, MT7531_PHY_IAC); - mt7530_mutex_lock(priv); + mutex_lock(&priv->reg_mutex); ret = readx_poll_timeout(_mt7530_unlocked_read, &p, val, !(val & MT7531_PHY_ACS_ST), 20, 100000); @@ -672,7 +656,7 @@ mt7531_ind_c22_phy_read(struct mt7530_priv *priv, int port, int regnum) ret = val & MT7531_MDIO_RW_DATA_MASK; out: - mt7530_mutex_unlock(priv); + mutex_unlock(&priv->reg_mutex); return ret; } @@ -687,7 +671,7 @@ mt7531_ind_c22_phy_write(struct mt7530_priv *priv, int port, int regnum, INIT_MT7530_DUMMY_POLL(&p, priv, MT7531_PHY_IAC); - mt7530_mutex_lock(priv); + mutex_lock(&priv->reg_mutex); ret = readx_poll_timeout(_mt7530_unlocked_read, &p, reg, !(reg & MT7531_PHY_ACS_ST), 20, 100000); @@ -709,7 +693,7 @@ mt7531_ind_c22_phy_write(struct mt7530_priv *priv, int port, int regnum, } out: - mt7530_mutex_unlock(priv); + mutex_unlock(&priv->reg_mutex); return ret; } @@ -1444,8 +1428,6 @@ mt7530_port_change_mtu(struct dsa_switch *ds, int port, int new_mtu) if (!dsa_is_cpu_port(ds, port)) return 0; - mt7530_mutex_lock(priv); - val = mt7530_mii_read(priv, MT7530_GMACCR); val &= ~MAX_RX_PKT_LEN_MASK; @@ -1465,8 +1447,6 @@ mt7530_port_change_mtu(struct dsa_switch *ds, int port, int new_mtu) mt7530_mii_write(priv, MT7530_GMACCR, val); - mt7530_mutex_unlock(priv); - return 0; } -- 2.54.0