netdev - Re: [PATCH] net: phy: at803x: disable delay only for RGMII mode

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Date:   Wed, 13 Feb 2019 09:02:10 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     Vinod Koul <vkoul@...nel.org>, David S Miller <davem@...emloft.net>
CC:     <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        <netdev@...r.kernel.org>, Niklas Cassel <niklas.cassel@...aro.org>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "Nori, Sekhar" <nsekhar@...com>,
        Marc Gonzalez <marc.w.gonzalez@...e.fr>
Subject: Re: [PATCH] net: phy: at803x: disable delay only for RGMII mode

Hi Vinod,

On 12/02/2019 16.19, Vinod Koul wrote:
> Per "Documentation/devicetree/bindings/net/ethernet.txt" RGMII mode
> should not have delay in PHY whereas RGMII_ID and RGMII_RXID/RGMII_TXID
> can have delay in phy.
> 
> So disable the delay only for RGMII mode and disable for other modes
s/disable for other modes/enable for other modes

Works fine on am335x-evmsk:
Tested-by: Peter Ujfalusi <peter.ujfalusi@...com>

and few comment

> Fixes: cd28d1d6e52e: ("net: phy: at803x: Disable phy delay for RGMII mode")
> Reported-by: Peter Ujfalusi <peter.ujfalusi@...com>
> Signed-off-by: Vinod Koul <vkoul@...nel.org>
> ---
>  drivers/net/phy/at803x.c | 33 ++++++++++++++++++++++++++-------
>  1 file changed, 26 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
> index 8ff12938ab47..7b54b54e3316 100644
> --- a/drivers/net/phy/at803x.c
> +++ b/drivers/net/phy/at803x.c
> @@ -110,6 +110,18 @@ static int at803x_debug_reg_mask(struct phy_device *phydev, u16 reg,
>  	return phy_write(phydev, AT803X_DEBUG_DATA, val);
>  }
>  
> +static inline int at803x_enable_rx_delay(struct phy_device *phydev)
> +{
> +	return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_0, 0,
> +				     AT803X_DEBUG_RX_CLK_DLY_EN);
> +}

static inline int at803x_select_rx_delay(struct phy_device *phydev,
					 bool enable)
{
}

> +
> +static inline int at803x_enable_tx_delay(struct phy_device *phydev)
> +{
> +	return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_5, 0,
> +				     AT803X_DEBUG_TX_CLK_DLY_EN);
> +}

static inline int at803x_select_tx_delay(struct phy_device *phydev,
					 bool enable)
{
}

perhaps?

> +
>  static inline int at803x_disable_rx_delay(struct phy_device *phydev)
>  {
>  	return at803x_debug_reg_mask(phydev, AT803X_DEBUG_REG_0,
> @@ -255,18 +267,25 @@ static int at803x_config_init(struct phy_device *phydev)
>  	if (ret < 0)
>  		return ret;
>  
> -	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID ||
> -			phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
> -			phydev->interface == PHY_INTERFACE_MODE_RGMII) {
> +	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;

is it a possibility to have PHY_INTERFACE_MODE_RGMII and other RGMII_ID
|| RGMII_TXID || RGMII_RXID set at the same time?

if not you can just return from here, no need to check for other RGMII
modes?

> +	};
> +
> +	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
> +			phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) {
> +		ret = at803x_enable_rx_delay(phydev);
> +		if (ret < 0)
> +			return ret;
>  	}
>  
> -	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID ||
> -			phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
> -			phydev->interface == PHY_INTERFACE_MODE_RGMII) {
> -		ret = at803x_disable_tx_delay(phydev);
> +	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
> +			phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) {
> +		ret = at803x_enable_tx_delay(phydev);
>  		if (ret < 0)
>  			return ret;
>  	}
> 

- Péter

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