[PATCH] net: ethernet: ti: am65-cpsw-nuss: enable 10Mbps link speed in rgmii mode

[Murali Karicheri <m-karicheri2@ti.com>]

+ Lokesh

On 04/17/2020 11:12 AM, Murali Karicheri wrote:
> In RGMII mode the 10Mbps link speed is supported only when CPSW2G MAC SL is
> configured for External Control ("in band") mode
> CPSW_PN_MAC_CONTROL_REG.CTL_EN(18) = 1
> 
> Hence update am65_cpsw_update_link() to follow documentation.
> 
> Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
> ---
>   drivers/net/ti/am65-cpsw-nuss.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/ti/am65-cpsw-nuss.c b/drivers/net/ti/am65-cpsw-nuss.c
> index 2b77213001..7531a07203 100644
> --- a/drivers/net/ti/am65-cpsw-nuss.c
> +++ b/drivers/net/ti/am65-cpsw-nuss.c
> @@ -61,6 +61,7 @@
>   
>   #define AM65_CPSW_MACSL_CTL_REG			0x0
>   #define AM65_CPSW_MACSL_CTL_REG_IFCTL_A		BIT(15)
> +#define AM65_CPSW_MACSL_CTL_EXT_EN		BIT(18)
>   #define AM65_CPSW_MACSL_CTL_REG_GIG		BIT(7)
>   #define AM65_CPSW_MACSL_CTL_REG_GMII_EN		BIT(5)
>   #define AM65_CPSW_MACSL_CTL_REG_LOOPBACK	BIT(1)
> @@ -187,6 +188,9 @@ static int am65_cpsw_update_link(struct am65_cpsw_priv *priv)
>   			      AM65_CPSW_MACSL_CTL_REG_GMII_EN;
>   		if (phy->speed == 1000)
>   			mac_control |= AM65_CPSW_MACSL_CTL_REG_GIG;
> +		if (phy->speed == 10 && phy_interface_is_rgmii(phy))
> +			/* Can be used with in band mode only */
> +			mac_control |= AM65_CPSW_MACSL_CTL_EXT_EN;
>   		if (phy->duplex == DUPLEX_FULL)
>   			mac_control |= AM65_CPSW_MACSL_CTL_REG_FULL_DUPLEX;
>   		if (phy->speed == 100)
> 

-- 
Murali Karicheri
Texas Instruments