> -Original Message-
> From: netdev-ow...@vger.kernel.org [mailto:netdev-ow...@vger.kernel.org]
> On Behalf Of Lin Yun Sheng
> Sent: Tuesday, June 27, 2017 2:01 PM
> To: da...@davemloft.net; and...@lunn.ch; f.faine...@gmail.com
> Cc: huangda...@hisilicon.com; xuw...@hisilicon.com;
> liguo...@hisilicon.com; yisen.zhu...@huawei.com;
> gabriele.paol...@huawei.com; john.ga...@huawei.com; linux...@huawei.com;
> yisen.zhu...@huawei.com; salil.me...@huawei.com; lipeng...@huawei.com;
> trem...@gmail.com; netdev@vger.kernel.org; linux-ker...@vger.kernel.org
> Subject: [PATCH NET V6 1/2] net: phy: Add phy loopback support in net phy
> framework
>
> This patch add set_loopback in phy_driver, which is used by Mac
> driver to enable or disable a phy. it also add a generic
> genphy_loopback function, which use BMCR loopback bit to enable
> or disable a phy.
"disable a phy" or disable the PHY loopback function?
>
> Signed-off-by: Lin Yun Sheng
> ---
> drivers/net/phy/marvell.c| 1 +
> drivers/net/phy/phy_device.c | 51
>
> include/linux/phy.h | 5 +
> 3 files changed, 57 insertions(+)
>
> diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
> index 57297ba..01a1586 100644
> --- a/drivers/net/phy/marvell.c
> +++ b/drivers/net/phy/marvell.c
> @@ -2094,6 +2094,7 @@ static int m88e1510_probe(struct phy_device *phydev)
> .get_sset_count = marvell_get_sset_count,
> .get_strings = marvell_get_strings,
> .get_stats = marvell_get_stats,
> + .set_loopback = genphy_loopback,
> },
> {
> .phy_id = MARVELL_PHY_ID_88E1540,
> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> index 1219eea..1e08d62 100644
> --- a/drivers/net/phy/phy_device.c
> +++ b/drivers/net/phy/phy_device.c
> @@ -1123,6 +1123,39 @@ int phy_resume(struct phy_device *phydev)
> }
> EXPORT_SYMBOL(phy_resume);
>
> +int phy_loopback(struct phy_device *phydev, bool enable)
> +{
> + struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver);
> + int ret = 0;
> +
> + mutex_lock(&phydev->lock);
> +
> + if (enable && phydev->loopback_enabled) {
> + ret = -EBUSY;
> + goto out;
> + }
> +
> + if (!enable && !phydev->loopback_enabled) {
> + ret = -EINVAL;
> + goto out;
> + }
> +
if (enable == phydev->loopback_enabled)
> + if (phydev->drv && phydrv->set_loopback)
> + ret = phydrv->set_loopback(phydev, enable);
> + else
> + ret = -EOPNOTSUPP;
> +
> + if (ret)
> + goto out;
> +
> + phydev->loopback_enabled = enable;
> +
> +out:
> + mutex_unlock(&phydev->lock);
> + return ret;
> +}
> +EXPORT_SYMBOL(phy_loopback);
> +
> /* Generic PHY support and helper functions */
>
> /**
> @@ -1628,6 +1661,23 @@ static int gen10g_resume(struct phy_device *phydev)
> return 0;
> }
>
> +int genphy_loopback(struct phy_device *phydev, bool enable)
> +{
> + int value;
> +
> + value = phy_read(phydev, MII_BMCR);
> + if (value < 0)
> + return value;
> +
> + if (enable)
> + value |= BMCR_LOOPBACK;
> + else
> + value &= ~BMCR_LOOPBACK;
> +
> + return phy_write(phydev, MII_BMCR, value);
> +}
> +EXPORT_SYMBOL(genphy_loopback);
> +
> static int __set_phy_supported(struct phy_device *phydev, u32 max_speed)
> {
> /* The default values for phydev->supported are provided by the PHY
> @@ -1874,6 +1924,7 @@ void phy_drivers_unregister(struct phy_driver *drv,
> int n)
> .read_status= genphy_read_status,
> .suspend= genphy_suspend,
> .resume = genphy_resume,
> + .set_loopback = genphy_loopback,
> }, {
> .phy_id = 0x,
> .phy_id_mask= 0x,
> diff --git a/include/linux/phy.h b/include/linux/phy.h
> index e76e4ad..49c903dc 100644
> --- a/include/linux/phy.h
> +++ b/include/linux/phy.h
> @@ -364,6 +364,7 @@ struct phy_c45_device_ids {
> * is_pseudo_fixed_link: Set to true if this phy is an Ethernet switch,
> etc.
> * has_fixups: Set to true if this phy has fixups/quirks.
> * suspended: Set to true if this phy has been suspended successfully.
> + * loopback_enabled: Set true if this phy has been loopbacked
> successfully.
> * state: state of the PHY for management purposes
> * dev_flags: Device-specific flags used by the PHY driver.
> * link_timeout: The number of timer firings to wait before the
> @@ -400,6 +401,7 @@ struct phy_device {
> bool is_pseudo_fixed_link;
> bool has_fixups;
> bool suspended;
> + bool loopback_enabled;
>
> enum phy_state state;
>
> @@ -639,6 +641,7 @@ struct phy_driver {
> int (*set_tunable)(struct phy_device *dev,
> struct ethtool_tunable *tuna,
> const void *data);
> + int (*set_loopback)(struct
