linux-kernel - Re: [PATCH] staging: octeon-ethernet: fix incorrect PHY mode

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Date:   Tue, 26 Mar 2019 10:01:50 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Aaro Koskinen <aaro.koskinen@....fi>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, Vinod Koul <vkoul@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: octeon-ethernet: fix incorrect PHY mode

> -static void cvm_set_rgmii_delay(struct device_node *np, int iface, int port)
> +static void cvm_set_rgmii_delay(struct octeon_ethernet *priv, int iface,
> +				int port)
>  {
> +	struct device_node *np = priv->of_node;
>  	u32 delay_value;
> +	bool rx_delay;
> +	bool tx_delay;
>  
> -	if (!of_property_read_u32(np, "rx-delay", &delay_value))
> +	/* By default, both RX/TX delay is enabled in
> +	 * __cvmx_helper_rgmii_enable().
> +	 */
> +	rx_delay = true;
> +	tx_delay = true;
> +
> +	if (!of_property_read_u32(np, "rx-delay", &delay_value)) {
>  		cvmx_write_csr(CVMX_ASXX_RX_CLK_SETX(port, iface), delay_value);
> -	if (!of_property_read_u32(np, "tx-delay", &delay_value))
> +		rx_delay = delay_value > 0;
> +	}
> +	if (!of_property_read_u32(np, "tx-delay", &delay_value)) {
>  		cvmx_write_csr(CVMX_ASXX_TX_CLK_SETX(port, iface), delay_value);
> +		tx_delay = delay_value > 0;
> +	}
> +
> +	if (!rx_delay && !tx_delay)
> +		priv->phy_mode = PHY_INTERFACE_MODE_RGMII_ID;
> +	else if (!rx_delay)
> +		priv->phy_mode = PHY_INTERFACE_MODE_RGMII_RXID;
> +	else if (!tx_delay)
> +		priv->phy_mode = PHY_INTERFACE_MODE_RGMII_TXID;
> +	else
> +		priv->phy_mode = PHY_INTERFACE_MODE_RGMII;

Humm, that is unique, as far as i know. Every other MAC driver uses
of_get_phy_mode() to get the value out of device tree. The proprietary
delay values can then be used to fine tune the basic delay setting
read from DT.

	Andrew