netdev - Re: [PATCH] net: phy: enhance GPY115 loopback disable function

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Date:   Fri, 24 Sep 2021 13:59:54 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Xu Liang <lxu@...linear.com>
Cc:     hkallweit1@...il.com, netdev@...r.kernel.org, davem@...emloft.net,
        kuba@...nel.org, vee.khee.wong@...ux.intel.com,
        linux@...linux.org.uk, hmehrtens@...linear.com,
        tmohren@...linear.com, mohammad.athari.ismail@...el.com
Subject: Re: [PATCH] net: phy: enhance GPY115 loopback disable function

On Fri, Sep 24, 2021 at 05:05:37PM +0800, Xu Liang wrote:
> GPY115 need reset PHY when it comes out from loopback mode if the firmware
> version number (lower 8 bits) is equal to or below 0x76.
> 
> Signed-off-by: Xu Liang <lxu@...linear.com>
> ---
>  drivers/net/phy/mxl-gpy.c | 30 ++++++++++++++++++++++++++++--
>  1 file changed, 28 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/phy/mxl-gpy.c b/drivers/net/phy/mxl-gpy.c
> index 2d5d5081c3b6..3ef62d5c4776 100644
> --- a/drivers/net/phy/mxl-gpy.c
> +++ b/drivers/net/phy/mxl-gpy.c
> @@ -493,6 +493,32 @@ static int gpy_loopback(struct phy_device *phydev, bool enable)
>  	return ret;
>  }
>  
> +static int gpy115_loopback(struct phy_device *phydev, bool enable)
> +{
> +	int ret;
> +	int fw_minor;
> +
> +	if (enable)
> +		return gpy_loopback(phydev, enable);
> +
> +	/* Show GPY PHY FW version in dmesg */

You don't show anything.

> +	ret = phy_read(phydev, PHY_FWV);
> +	if (ret < 0)
> +		return ret;
> +
> +	fw_minor = FIELD_GET(PHY_FWV_MINOR_MASK, ret);
> +	if (fw_minor > 0x0076)
> +		return gpy_loopback(phydev, 0);
> +
> +	ret = phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK, BMCR_RESET);
> +	if (!ret) {
> +		/* Some delay for the reset complete. */
> +		msleep(100);
> +	}

genphy_soft_reset() would be better. Does a soft reset clear the
BMCR_LOOPBACK bit? It should do, according to C22.

	      Andrew