netdev - Re: [PATCH v2 4/5] net: phy: at803x: Disable phy delay for RGMII mode

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Message-ID: <3baa95a5-5905-5d34-b656-698c792e6716@gmail.com>
Date:   Tue, 8 Jan 2019 09:59:09 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vinod Koul <vkoul@...nel.org>, David S Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Niklas Cassel <niklas.cassel@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH v2 4/5] net: phy: at803x: Disable phy delay for RGMII mode

On 1/8/19 8:29 AM, Vinod Koul wrote:
> For RGMII mode, phy delay should be disabled. Add this case along
> with disable delay routines.
> 
> Signed-off-by: Vinod Koul <vkoul@...nel.org>
> ---
>  drivers/net/phy/at803x.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
> index f9432d053a22..e7cf1d5b0514 100644
> --- a/drivers/net/phy/at803x.c
> +++ b/drivers/net/phy/at803x.c
> @@ -122,6 +122,18 @@ static inline int at803x_enable_tx_delay(struct phy_device *phydev)
>  					AT803X_DEBUG_TX_CLK_DLY_EN);
>  }
>  
> +static inline int at803x_disable_rx_delay(struct phy_device *phydev)
> +{
> +	return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_0,
> +				     AT803X_DEBUG_RX_CLK_DLY_EN, 0);
> +}
> +
> +static inline int at803x_disable_tx_delay(struct phy_device *phydev)
> +{
> +	return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_5,
> +				     AT803X_DEBUG_TX_CLK_DLY_EN, 0);
> +}
> +
>  /* save relevant PHY registers to private copy */
>  static void at803x_context_save(struct phy_device *phydev,
>  				struct at803x_context *context)
> @@ -269,6 +281,15 @@ static int at803x_config_init(struct phy_device *phydev)
>  			return ret;
>  	}
>  
> +	if (phydev->interface == PHY_INTERFACE_MODE_RGMII) {
> +		ret = at803x_disable_rx_delay(phydev);
> +		if (ret < 0)
> +			return ret;
> +		ret = at803x_disable_tx_delay(phydev);
> +		if (ret < 0)
> +			return ret;
> +	}

This looks right in that PHY_INTERFACE_MODE_RGMII from the perspective
of the PHY means no TX/RX delays, but you would also have to take care
of PHY_INTERFACE_MODE_RGMII_TXID and disable the RX delay in that case,
and PHY_INTERFACE_MODE_RGMII_RXID and disabled the TX delay in that case.


Thanks!
-- 
Florian