Subject: Re: [PATCH 2/2] net: ethernet: mvneta: Add back interface mode validation

From: Russell King - ARM Linux admin <[email-masked]>
Date: Wed, 24 Jun 2020 10:55:02 +0100

On Wed, Jun 24, 2020 at 09:00:45AM +0200, Sascha Hauer wrote:
> When writing the serdes configuration register was moved to
> mvneta_config_interface() the whole code block was removed from
> mvneta_port_power_up() in the assumption that its only purpose was to
> write the serdes configuration register. As mentioned by Russell King
> its purpose was also to check for valid interface modes early so that
> later in the driver we do not have to care for unexpected interface
> modes.
> Add back the test to let the driver bail out early on unhandled
> interface modes.
> 
> Signed-off-by: Sascha Hauer <[email-masked]>

Fixes: b4748553f53f ("net: ethernet: mvneta: Fix Serdes configuration for SoCs without comphy")
Reviewed-by: Russell King <[email-masked]>

Thanks.

> ---
>  drivers/net/ethernet/marvell/mvneta.c | 22 +++++++++++++++++++---
>  1 file changed, 19 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
> index c4552f868157c..c639e3a293024 100644
> --- a/drivers/net/ethernet/marvell/mvneta.c
> +++ b/drivers/net/ethernet/marvell/mvneta.c
> @@ -5009,10 +5009,18 @@ static void mvneta_conf_mbus_windows(struct mvneta_port *pp,
>  }
>  
>  /* Power up the port */
> -static void mvneta_port_power_up(struct mvneta_port *pp, int phy_mode)
> +static int mvneta_port_power_up(struct mvneta_port *pp, int phy_mode)
>  {
>  	/* MAC Cause register should be cleared */
>  	mvreg_write(pp, MVNETA_UNIT_INTR_CAUSE, 0);
> +
> +	if (phy_mode != PHY_INTERFACE_MODE_QSGMII &&
> +	    phy_mode != PHY_INTERFACE_MODE_SGMII &&
> +	    !phy_interface_mode_is_8023z(phy_mode) &&
> +	    !phy_interface_mode_is_rgmii(phy_mode))
> +		return -EINVAL;
> +
> +	return 0;
>  }
>  
>  /* Device initialization routine */
> @@ -5198,7 +5206,11 @@ static int mvneta_probe(struct platform_device *pdev)
>  	if (err < 0)
>  		goto err_netdev;
>  
> -	mvneta_port_power_up(pp, phy_mode);
> +	err = mvneta_port_power_up(pp, pp->phy_interface);
> +	if (err < 0) {
> +		dev_err(&pdev->dev, "can't power up port\n");
> +		return err;
> +	}
>  
>  	/* Armada3700 network controller does not support per-cpu
>  	 * operation, so only single NAPI should be initialized.
> @@ -5352,7 +5364,11 @@ static int mvneta_resume(struct device *device)
>  		}
>  	}
>  	mvneta_defaults_set(pp);
> -	mvneta_port_power_up(pp, pp->phy_interface);
> +	err = mvneta_port_power_up(pp, pp->phy_interface);
> +	if (err < 0) {
> +		dev_err(device, "can't power up port\n");
> +		return err;
> +	}
>  
>  	netif_device_attach(dev);
>  
> -- 
> 2.27.0

-- 
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