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[193.12.47.89]) by smtp.gmail.com with ESMTPSA id p6sm1869984lfa.241.2022.01.26.08.05.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Jan 2022 08:05:54 -0800 (PST) From: Tobias Waldekranz To: davem@davemloft.net, kuba@kernel.org Cc: netdev@vger.kernel.org, Andrew Lunn , Marcin Wojtas , Calvin Johnson , Markus Koch , linux-kernel@vger.kernel.org Subject: [PATCH v2 net-next 3/5] net/fsl: xgmac_mdio: Support preamble suppression Date: Wed, 26 Jan 2022 17:05:41 +0100 Message-Id: <20220126160544.1179489-4-tobias@waldekranz.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220126160544.1179489-1-tobias@waldekranz.com> References: <20220126160544.1179489-1-tobias@waldekranz.com> MIME-Version: 1.0 Organization: Westermo Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Support the standard "suppress-preamble" attribute to disable preamble generation. Signed-off-by: Tobias Waldekranz Reviewed-by: Andrew Lunn --- drivers/net/ethernet/freescale/xgmac_mdio.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/net/ethernet/freescale/xgmac_mdio.c b/drivers/net/ethernet/freescale/xgmac_mdio.c index 40442d64a247..18bf2370d45a 100644 --- a/drivers/net/ethernet/freescale/xgmac_mdio.c +++ b/drivers/net/ethernet/freescale/xgmac_mdio.c @@ -39,6 +39,7 @@ struct tgec_mdio_controller { #define MDIO_STAT_CLKDIV(x) (((x>>1) & 0xff) << 8) #define MDIO_STAT_BSY BIT(0) #define MDIO_STAT_RD_ER BIT(1) +#define MDIO_STAT_PRE_DIS BIT(5) #define MDIO_CTL_DEV_ADDR(x) (x & 0x1f) #define MDIO_CTL_PORT_ADDR(x) ((x & 0x1f) << 5) #define MDIO_CTL_PRE_DIS BIT(10) @@ -254,6 +255,21 @@ static int xgmac_mdio_read(struct mii_bus *bus, int phy_id, int regnum) return ret; } +static void xgmac_mdio_set_suppress_preamble(struct mii_bus *bus) +{ + struct mdio_fsl_priv *priv = (struct mdio_fsl_priv *)bus->priv; + struct tgec_mdio_controller __iomem *regs = priv->mdio_base; + struct device *dev = bus->parent; + u32 mdio_stat; + + if (!device_property_read_bool(dev, "suppress-preamble")) + return; + + mdio_stat = xgmac_read32(®s->mdio_stat, priv->is_little_endian); + mdio_stat |= MDIO_STAT_PRE_DIS; + xgmac_write32(mdio_stat, ®s->mdio_stat, priv->is_little_endian); +} + static int xgmac_mdio_probe(struct platform_device *pdev) { struct fwnode_handle *fwnode; @@ -301,6 +317,8 @@ static int xgmac_mdio_probe(struct platform_device *pdev) priv->has_a011043 = device_property_read_bool(&pdev->dev, "fsl,erratum-a011043"); + xgmac_mdio_set_suppress_preamble(bus); + fwnode = pdev->dev.fwnode; if (is_of_node(fwnode)) ret = of_mdiobus_register(bus, to_of_node(fwnode)); -- 2.25.1