On Wed, May 13, 2020 at 04:25:44PM +0800, Huazhong Tan wrote:
> From: Yufeng Mo <moyuf...@huawei.com>
> 
> PHY loopback is already supported by genphy driver. This patch
> adds the set_loopback interface to RTL8211F PHY driver, so the PHY
> selftest can run properly on it.
> 
> Signed-off-by: Yufeng Mo <moyuf...@huawei.com>
> Signed-off-by: Jian Shen <shenjia...@huawei.com>
> Signed-off-by: Huazhong Tan <tanhuazh...@huawei.com>

It took three people to write a 1 line patch?

> ---
>  drivers/net/phy/realtek.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
> index c7229d0..6c5918c 100644
> --- a/drivers/net/phy/realtek.c
> +++ b/drivers/net/phy/realtek.c
> @@ -615,6 +615,7 @@ static struct phy_driver realtek_drvs[] = {
>               .resume         = genphy_resume,
>               .read_page      = rtl821x_read_page,
>               .write_page     = rtl821x_write_page,
> +             .set_loopback   = genphy_loopback,
>       }, {
>               .name           = "Generic FE-GE Realtek PHY",
>               .match_phy_device = rtlgen_match_phy_device,

Do you have access to the data sheets? Can you check if the other PHYs
supported by this driver also support loopback in the standard way?
They probably do.

          Andrew

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