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

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Date:   Fri, 24 Sep 2021 15:48:42 +0000
From:   Liang Xu <lxu@...linear.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "vee.khee.wong@...ux.intel.com" <vee.khee.wong@...ux.intel.com>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        Hauke Mehrtens <hmehrtens@...linear.com>,
        Thomas Mohren <tmohren@...linear.com>,
        "Ismail, Mohammad Athari" <mohammad.athari.ismail@...el.com>
Subject: Re: [PATCH] net: phy: enhance GPY115 loopback disable function

On 24/9/2021 7:59 pm, Andrew Lunn wrote:
> This email was sent from outside of MaxLinear.
>
>
> 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.
You are right. Sorry it was a mistake. I will fix it.
>
>> +     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
>
Yes, I will use genphy_soft_reset instead.


Thanks & Regards,

Xu Liang