[PATCH 1/2] net: designware: Reset eth phy before phy connect

[Kever Yang]

On 2024/1/18 15:19, Jonas Karlman wrote:
> Some ethernet PHY require being reset before a phy-id can be read back
> on the MDIO bus. This can result in the following message being show
> on e.g. a Radxa ROCK Pi E v1.21 with a RTL8211F ethernet PHY.
>
>    Could not get PHY for ethernet at ff540000: addr -1
>
> Add support to designware ethernet driver to reset eth phy by calling
> the eth phy uclass function eth_phy_set_mdio_bus(). The call use NULL
> as bus parameter to not set a shared mdio bus reference that would be
> freed when probe fails. Also add a eth_phy_get_addr() call to try and
> get the phy addr from DT when DM_MDIO is disabled.
>
> This help fix ethernet on Radxa ROCK Pi E v1.21:
>
>    => mdio list
>    ethernet at ff540000:
>    1 - RealTek RTL8211F <--> ethernet at ff540000
>
> Reported-by: Trevor Woerner <twoerner at gmail.com>
> Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
Reviewed-by: Kever Yang <kever.yang at rock-chips.com>

Thanks,
- Kever
> ---
>   drivers/net/designware.c | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/drivers/net/designware.c b/drivers/net/designware.c
> index a174344b3ef5..9aa5d8a1409e 100644
> --- a/drivers/net/designware.c
> +++ b/drivers/net/designware.c
> @@ -13,6 +13,7 @@
>   #include <cpu_func.h>
>   #include <dm.h>
>   #include <errno.h>
> +#include <eth_phy.h>
>   #include <log.h>
>   #include <miiphy.h>
>   #include <malloc.h>
> @@ -576,6 +577,9 @@ static int dw_phy_init(struct dw_eth_dev *priv, void *dev)
>   	struct phy_device *phydev;
>   	int ret;
>   
> +	if (IS_ENABLED(CONFIG_DM_ETH_PHY))
> +		eth_phy_set_mdio_bus(dev, NULL);
> +
>   #if IS_ENABLED(CONFIG_DM_MDIO)
>   	phydev = dm_eth_phy_connect(dev);
>   	if (!phydev)
> @@ -583,6 +587,9 @@ static int dw_phy_init(struct dw_eth_dev *priv, void *dev)
>   #else
>   	int phy_addr = -1;
>   
> +	if (IS_ENABLED(CONFIG_DM_ETH_PHY))
> +		phy_addr = eth_phy_get_addr(dev);
> +
>   #ifdef CONFIG_PHY_ADDR
>   	phy_addr = CONFIG_PHY_ADDR;
>   #endif