netdev - Re: [PATCH RFC net 2/2] net: dsa: lantiq_gswip: Configure all remaining GSWIP_MII

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Date:   Tue, 6 Apr 2021 23:09:27 +0200
From:   Hauke Mehrtens <hauke@...ke-m.de>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
        olteanv@...il.com, netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, linux@...linux.org.uk,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH RFC net 2/2] net: dsa: lantiq_gswip: Configure all
 remaining GSWIP_MII_CFG bits

On 4/6/21 10:35 PM, Martin Blumenstingl wrote:
> There are a few more bits in the GSWIP_MII_CFG register for which we
> did rely on the boot-loader (or the hardware defaults) to set them up
> properly.
> 
> For some external RMII PHYs we need to select the GSWIP_MII_CFG_RMII_CLK
> bit and also we should un-set it for non-RMII PHYs.

The GSWIP_MII_CFG_RMII_CLK option is ignored in other modes.

> The GSWIP IP also
> supports in-band auto-negotiation for RGMII PHYs. Set or unset the
> corresponding bit depending on the auto-negotiation mode.
> 
> Clear the xMII isolation bit when set at initialization time if it was
> previously set by the bootloader. Not doing so could lead to no traffic
> (neither RX nor TX) on a port with this bit set.
> 
> While here, also add the GSWIP_MII_CFG_RESET bit. We don't need to
> manage it because this bit is self-clearning when set. We still add it
> here to get a better overview of the GSWIP_MII_CFG register.
> 
> Fixes: 14fceff4771e51 ("net: dsa: Add Lantiq / Intel DSA driver for vrx200")
> Cc: stable@...r.kernel.org
> Suggested-by: Hauke Mehrtens <hauke@...ke-m.de>
> Acked-by: Hauke Mehrtens <hauke@...ke-m.de>
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> ---
>   drivers/net/dsa/lantiq_gswip.c | 22 +++++++++++++++++++---
>   1 file changed, 19 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
> index 47ea3a8c90a4..f330035ed85b 100644
> --- a/drivers/net/dsa/lantiq_gswip.c
> +++ b/drivers/net/dsa/lantiq_gswip.c
> @@ -93,8 +93,12 @@
>   
>   /* GSWIP MII Registers */
>   #define GSWIP_MII_CFGp(p)		(0x2 * (p))
> +#define  GSWIP_MII_CFG_RESET		BIT(15)
>   #define  GSWIP_MII_CFG_EN		BIT(14)
> +#define  GSWIP_MII_CFG_ISOLATE		BIT(13)
>   #define  GSWIP_MII_CFG_LDCLKDIS		BIT(12)
> +#define  GSWIP_MII_CFG_RGMII_IBS	BIT(8)
> +#define  GSWIP_MII_CFG_RMII_CLK		BIT(7)
>   #define  GSWIP_MII_CFG_MODE_MIIP	0x0
>   #define  GSWIP_MII_CFG_MODE_MIIM	0x1
>   #define  GSWIP_MII_CFG_MODE_RMIIP	0x2
> @@ -821,9 +825,11 @@ static int gswip_setup(struct dsa_switch *ds)
>   	/* Configure the MDIO Clock 2.5 MHz */
>   	gswip_mdio_mask(priv, 0xff, 0x09, GSWIP_MDIO_MDC_CFG1);
>   
> -	/* Disable the xMII link */
> +	/* Disable the xMII interface and clear it's isolation bit */
>   	for (i = 0; i < priv->hw_info->max_ports; i++)
> -		gswip_mii_mask_cfg(priv, GSWIP_MII_CFG_EN, 0, i);
> +		gswip_mii_mask_cfg(priv,
> +				   GSWIP_MII_CFG_EN | GSWIP_MII_CFG_ISOLATE,
> +				   0, i);
>   
>   	/* enable special tag insertion on cpu port */
>   	gswip_switch_mask(priv, 0, GSWIP_FDMA_PCTRL_STEN,
> @@ -1597,19 +1603,29 @@ static void gswip_phylink_mac_config(struct dsa_switch *ds, int port,
>   		break;
>   	case PHY_INTERFACE_MODE_RMII:
>   		miicfg |= GSWIP_MII_CFG_MODE_RMIIM;
> +
> +		/* Configure the RMII clock as output: */
> +		miicfg |= GSWIP_MII_CFG_RMII_CLK;
>   		break;
>   	case PHY_INTERFACE_MODE_RGMII:
>   	case PHY_INTERFACE_MODE_RGMII_ID:
>   	case PHY_INTERFACE_MODE_RGMII_RXID:
>   	case PHY_INTERFACE_MODE_RGMII_TXID:
>   		miicfg |= GSWIP_MII_CFG_MODE_RGMII;
> +
> +		if (phylink_autoneg_inband(mode))
> +			miicfg |= GSWIP_MII_CFG_RGMII_IBS;
>   		break;
>   	default:
>   		dev_err(ds->dev,
>   			"Unsupported interface: %d\n", state->interface);
>   		return;
>   	}
> -	gswip_mii_mask_cfg(priv, GSWIP_MII_CFG_MODE_MASK, miicfg, port);
> +
> +	gswip_mii_mask_cfg(priv,
> +			   GSWIP_MII_CFG_MODE_MASK | GSWIP_MII_CFG_RMII_CLK |
> +			   GSWIP_MII_CFG_RGMII_IBS | GSWIP_MII_CFG_LDCLKDIS,
> +			   miicfg, port);
>   
>   	gswip_port_set_link(priv, port, state->link);
>   	gswip_port_set_speed(priv, port, state->speed, state->interface);
>