linux-kernel - Re: [PATCH RFC net-next v2 06/12] net: mdio: mdio-bitbang: Separate C22 and C45 transactions

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Message-ID: <20230103131555.5i4tj7sk72gmed5d@skbuf>
Date:   Tue, 3 Jan 2023 15:15:55 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Michael Walle <michael@...le.cc>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Wei Fang <wei.fang@....com>,
        Shenwei Wang <shenwei.wang@....com>,
        Clark Wang <xiaoning.wang@....com>,
        NXP Linux Team <linux-imx@....com>,
        Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, Andrew Lunn <andrew@...n.ch>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: Re: [PATCH RFC net-next v2 06/12] net: mdio: mdio-bitbang: Separate
 C22 and C45 transactions

On Wed, Dec 28, 2022 at 12:07:22AM +0100, Michael Walle wrote:
> From: Andrew Lunn <andrew@...n.ch>
> 
> The bitbbanging bus driver can perform both C22 and C45 transfers.
> Create separate functions for each and register the C45 versions using
> the new driver API calls.
> 
> The SH Ethernet driver places wrappers around these functions. In
> order to not break boards which might be using C45, add similar
> wrappers for C45 operations.
> 
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---

Incomplete conversion, this breaks the build. Need to update all users
of the bitbang driver (also davinci_mdio). Something like the diff below
fixes that, but it leaves the davinci_mdio driver in a partially
converted state (if data->manual_mode is true, new API is used,
otherwise old API is used). So another patch to convert the other case
will likely be needed.

diff --git a/drivers/net/ethernet/ti/davinci_mdio.c b/drivers/net/ethernet/ti/davinci_mdio.c
index 946b9753ccfb..23169e36a3d4 100644
--- a/drivers/net/ethernet/ti/davinci_mdio.c
+++ b/drivers/net/ethernet/ti/davinci_mdio.c
@@ -225,7 +225,7 @@ static int davinci_get_mdio_data(struct mdiobb_ctrl *ctrl)
 	return test_bit(MDIO_PIN, &reg);
 }
 
-static int davinci_mdiobb_read(struct mii_bus *bus, int phy, int reg)
+static int davinci_mdiobb_read_c22(struct mii_bus *bus, int phy, int reg)
 {
 	int ret;
 
@@ -233,7 +233,7 @@ static int davinci_mdiobb_read(struct mii_bus *bus, int phy, int reg)
 	if (ret < 0)
 		return ret;
 
-	ret = mdiobb_read(bus, phy, reg);
+	ret = mdiobb_read_c22(bus, phy, reg);
 
 	pm_runtime_mark_last_busy(bus->parent);
 	pm_runtime_put_autosuspend(bus->parent);
@@ -241,8 +241,8 @@ static int davinci_mdiobb_read(struct mii_bus *bus, int phy, int reg)
 	return ret;
 }
 
-static int davinci_mdiobb_write(struct mii_bus *bus, int phy, int reg,
-				u16 val)
+static int davinci_mdiobb_write_c22(struct mii_bus *bus, int phy, int reg,
+				    u16 val)
 {
 	int ret;
 
@@ -250,7 +250,41 @@ static int davinci_mdiobb_write(struct mii_bus *bus, int phy, int reg,
 	if (ret < 0)
 		return ret;
 
-	ret = mdiobb_write(bus, phy, reg, val);
+	ret = mdiobb_write_c22(bus, phy, reg, val);
+
+	pm_runtime_mark_last_busy(bus->parent);
+	pm_runtime_put_autosuspend(bus->parent);
+
+	return ret;
+}
+
+static int davinci_mdiobb_read_c45(struct mii_bus *bus, int phy, int devad,
+				   int reg)
+{
+	int ret;
+
+	ret = pm_runtime_resume_and_get(bus->parent);
+	if (ret < 0)
+		return ret;
+
+	ret = mdiobb_read_c45(bus, phy, devad, reg);
+
+	pm_runtime_mark_last_busy(bus->parent);
+	pm_runtime_put_autosuspend(bus->parent);
+
+	return ret;
+}
+
+static int davinci_mdiobb_write_c45(struct mii_bus *bus, int phy, int devad,
+				    int reg, u16 val)
+{
+	int ret;
+
+	ret = pm_runtime_resume_and_get(bus->parent);
+	if (ret < 0)
+		return ret;
+
+	ret = mdiobb_write_c45(bus, phy, devad, reg, val);
 
 	pm_runtime_mark_last_busy(bus->parent);
 	pm_runtime_put_autosuspend(bus->parent);
@@ -573,8 +607,10 @@ static int davinci_mdio_probe(struct platform_device *pdev)
 	data->bus->name		= dev_name(dev);
 
 	if (data->manual_mode) {
-		data->bus->read		= davinci_mdiobb_read;
-		data->bus->write	= davinci_mdiobb_write;
+		data->bus->read		= davinci_mdiobb_read_c22;
+		data->bus->write	= davinci_mdiobb_write_c22;
+		data->bus->read_c45	= davinci_mdiobb_read_c45;
+		data->bus->write_c45	= davinci_mdiobb_write_c45;
 		data->bus->reset	= davinci_mdiobb_reset;
 
 		dev_info(dev, "Configuring MDIO in manual mode\n");