linux-kernel - Re: [PATCH NET] net/hns:bugfix of ethtool -t phy self

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Date:   Mon, 19 Jun 2017 14:00:43 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Lin Yun Sheng <linyunsheng@...wei.com>, davem@...emloft.net
Cc:     huangdaode@...ilicon.com, xuwei5@...ilicon.com,
        liguozhu@...ilicon.com, Yisen.Zhuang@...wei.com,
        gabriele.paoloni@...wei.com, john.garry@...wei.com,
        linuxarm@...wei.com, salil.mehta@...wei.com, lipeng321@...wei.com,
        yankejian@...wei.com, tremyfr@...il.com, xieqianqian@...wei.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH NET] net/hns:bugfix of ethtool -t phy self_test

On 06/16/2017 02:24 AM, Lin Yun Sheng wrote:
> This patch fixes the phy loopback self_test failed issue. when
> Marvell Phy Module is loaded, it will powerdown fiber when doing
> phy loopback self test, which cause phy loopback self_test fail.
> 
> Signed-off-by: Lin Yun Sheng <linyunsheng@...wei.com>
> ---
>  drivers/net/ethernet/hisilicon/hns/hns_ethtool.c | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
> index b8fab14..e95795b 100644
> --- a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
> +++ b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
> @@ -288,9 +288,15 @@ static int hns_nic_config_phy_loopback(struct phy_device *phy_dev, u8 en)

The question really is, why is not this properly integrated into the PHY
driver and PHYLIB such that the only thing the Ethernet MAC driver has
to call is a function of the PHY driver putting it in self-test?

>  
>  		/* Force 1000M Link, Default is 0x0200 */
>  		phy_write(phy_dev, 7, 0x20C);
> -		phy_write(phy_dev, HNS_PHY_PAGE_REG, 0);
>  
> -		/* Enable PHY loop-back */
> +		/* Powerup Fiber */
> +		phy_write(phy_dev, HNS_PHY_PAGE_REG, 1);
> +		val = phy_read(phy_dev, COPPER_CONTROL_REG);
> +		val &= ~PHY_POWER_DOWN;
> +		phy_write(phy_dev, COPPER_CONTROL_REG, val);
> +
> +		/* Enable Phy Loopback */
> +		phy_write(phy_dev, HNS_PHY_PAGE_REG, 0);
>  		val = phy_read(phy_dev, COPPER_CONTROL_REG);
>  		val |= PHY_LOOP_BACK;
>  		val &= ~PHY_POWER_DOWN;
> @@ -299,6 +305,12 @@ static int hns_nic_config_phy_loopback(struct phy_device *phy_dev, u8 en)
>  		phy_write(phy_dev, HNS_PHY_PAGE_REG, 0xFA);
>  		phy_write(phy_dev, 1, 0x400);
>  		phy_write(phy_dev, 7, 0x200);
> +
> +		phy_write(phy_dev, HNS_PHY_PAGE_REG, 1);
> +		val = phy_read(phy_dev, COPPER_CONTROL_REG);
> +		val |= PHY_POWER_DOWN;
> +		phy_write(phy_dev, COPPER_CONTROL_REG, val);
> +
>  		phy_write(phy_dev, HNS_PHY_PAGE_REG, 0);
>  		phy_write(phy_dev, 9, 0xF00);
>  
> 


-- 
Florian