linux-kernel - Re: [PATCH] net: dsa: b53: add support for BCM63xx RGMIIs

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Date:   Sun, 19 Mar 2023 19:50:47 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Álvaro Fernández Rojas <noltari@...il.com>
Cc:     f.fainelli@...il.com, jonas.gorski@...il.com, olteanv@...il.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: dsa: b53: add support for BCM63xx RGMIIs

> +static void b53_adjust_63xx_rgmii(struct dsa_switch *ds, int port,
> +				  phy_interface_t interface)
> +{
> +	struct b53_device *dev = ds->priv;
> +	u8 rgmii_ctrl = 0, off;
> +
> +	if (port == dev->imp_port)
> +		off = B53_RGMII_CTRL_IMP;
> +	else
> +		off = B53_RGMII_CTRL_P(port);
> +
> +	b53_read8(dev, B53_CTRL_PAGE, off, &rgmii_ctrl);
> +
> +	rgmii_ctrl &= ~(RGMII_CTRL_DLL_RXC | RGMII_CTRL_DLL_TXC);
> +	if (interface == PHY_INTERFACE_MODE_RGMII_ID)
> +		rgmii_ctrl |= (RGMII_CTRL_DLL_RXC | RGMII_CTRL_DLL_TXC);
> +	else if (interface == PHY_INTERFACE_MODE_RGMII_RXID)
> +		rgmii_ctrl |= RGMII_CTRL_DLL_RXC;
> +	else if (interface == PHY_INTERFACE_MODE_RGMII_TXID)
> +		rgmii_ctrl |= RGMII_CTRL_DLL_TXC;

Please change this to a switch statement. Then i would suggest having
a case PHY_INTERFACE_MODE_RGMII: to make it clear you are handling
that as well, removing all delays. You do look to be handling it, so
it is not a big problem, but in the past we have had code where one of
the RGMII modes has been ignored resulting in some horrible problems
later. So it is something i now always look for, and like to be obvious.

> +
> +	if (port != dev->imp_port)
> +		rgmii_ctrl |= RGMII_CTRL_ENABLE_GMII;
> +
> +	b53_write8(dev, B53_CTRL_PAGE, off, rgmii_ctrl);
> +
> +	dev_info(ds->dev, "Configured port %d for %s\n", port,
> +		 phy_modes(interface));

dev_dbg().

	Andrew