Re: [PATCH v2] net: ethernet: ti: cpsw: add check for in-band mode setting with RGMII PHY interface

[Grygorii Strashko]

On 03/15/2018 11:56 AM, SZ Lin (æäæ) wrote:
> According to AM335x TRM[1] 14.3.6.2, AM437x TRM[2] 15.3.6.2 and
> DRA7 TRM[3] 24.11.4.8.7.3.3, in-band mode in EXT_EN(bit18) register is only
> available when PHY is configured in RGMII mode with 10Mbps speed. It will
> cause some networking issues without RGMII mode, such as carrier sense
> errors and low throughput. TI also mentioned this issue in their forum[4].
>
> This patch adds the check mechanism for PHY interface with RGMII interface
> type, the in-band mode can only be set in RGMII mode with 10Mbps speed.
>
> References:
> [1]: https://www.ti.com/lit/ug/spruh73p/spruh73p.pdf
> [2]: http://www.ti.com/lit/ug/spruhl7h/spruhl7h.pdf
> [3]: http://www.ti.com/lit/ug/spruic2b/spruic2b.pdf
> [4]: https://e2e.ti.com/support/arm/sitara_arm/f/791/p/640765/2392155
>
> Suggested-by: Holsety Chen (éæè) <Holsety.Chen@xxxxxxxx>
> Signed-off-by: SZ Lin (æäæ) <sz.lin@xxxxxxxx>
> Signed-off-by: Schuyler Patton <spatton@xxxxxx>
> ---
> Changes from v1:
> - Use phy_interface_is_rgmii helper function
> - Remove blank line

Reviewed-by: Grygorii Strashko <grygorii.strashko@xxxxxx>

>   drivers/net/ethernet/ti/cpsw.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
> index 1b1b78fdc138..b2b30c9df037 100644
> --- a/drivers/net/ethernet/ti/cpsw.c
> +++ b/drivers/net/ethernet/ti/cpsw.c
> @@ -1014,7 +1014,8 @@ static void _cpsw_adjust_link(struct cpsw_slave *slave,
>   		/* set speed_in input in case RMII mode is used in 100Mbps */
>   		if (phy->speed == 100)
>   			mac_control |= BIT(15);
> -		else if (phy->speed == 10)
> +		/* in band mode only works in 10Mbps RGMII mode */
> +		else if ((phy->speed == 10) && phy_interface_is_rgmii(phy))
>   			mac_control |= BIT(18); /* In Band mode */
>   
>   		if (priv->rx_pause)

--
regards,
-grygorii