[PATCH 06/12] net: stmmac: sun8i: force select external PHY when no internal one

[Sergei Shtylyov]

Hello!

On 06.04.2019 2:45, megous at megous.com wrote:

> From: Icenowy Zheng <icenowy at aosc.io>
> 
> The PHY selection bit also exists on SoCs without an internal PHY; if
> it's set to 1 (internal PHY) then the MAC will not make use of any PHY.
> 
> This problem appears when adapting for H6, which has no real internal
> PHY (the "internal PHY" on H6 is not on-die, but on a co-packaged AC200
> chip, via RMII interface at GPIO bank A), but the PHY selection bit is
> set.
> 
> Force the PHY selection bit to 0 when no external PHY to select this
> problem.

    "Select this problem" sound weird...

> Signed-off-by: Icenowy Zheng <icenowy at aosc.io>
> ---
>   drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
> index e3e3dc44b33b..bd340e77b2ea 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
> @@ -908,6 +908,11 @@ static int sun8i_dwmac_set_syscon(struct stmmac_priv *priv)
>   		 * address. No need to mask it again.
>   		 */
>   		reg |= 1 << H3_EPHY_ADDR_SHIFT;
> +	} else {
> +		/* For SoCs without internal PHY the PHY selection bit should be
> +		 * set to 0 (external PHY).
> +		 */
> +		reg &= ~(H3_EPHY_SELECT);
    No () should be needed here, add () around the macro body if still needed.

[...]

MBR, Sergei