netdev - Re: [PATCH] net: fec: fix phy reset operation to let imx6sl evk work

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Date:	Tue, 10 Sep 2013 20:48:56 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Fugang Duan <B38611@...escale.com>
Cc:	shawn.guo@...aro.org, davem@...emloft.net, netdev@...r.kernel.org,
	bhutchings@...arflare.com, stephen@...workplumber.org,
	b20596@...escale.com
Subject: Re: [PATCH] net: fec: fix phy reset operation to let imx6sl evk work

On Tue, Sep 10, 2013 at 05:07:33PM +0800, Fugang Duan wrote:
> diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
> index f9aacf5..0c17df2 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -61,6 +61,7 @@
>  #include "fec.h"
>  
>  static void set_multicast_list(struct net_device *ndev);
> +static void fec_enet_reset_phy(struct platform_device *pdev);

Please move the function up and remove the prototype.

> @@ -1780,6 +1781,10 @@ fec_enet_open(struct net_device *ndev)
>  	phy_start(fep->phy_dev);
>  	netif_start_queue(ndev);
>  	fep->opened = 1;
> +
> +	/* reset phy */
> +	fec_enet_reset_phy(fep->pdev);

Drop this comment. It's very redundant to the function name.

> +static void fec_enet_reset_phy(struct platform_device *pdev)
>  {
> -	/*
> -	 * In case of platform probe, the reset has been done
> -	 * by machine code.
> -	 */
> +	struct net_device *ndev = platform_get_drvdata(pdev);
> +	struct fec_enet_private *fep = netdev_priv(ndev);
> +
> +	/* check GPIO valid to avoid kernel print warning when no gpio reset */
> +	if (gpio_is_valid(fep->phy_reset_gpio)) {
> +		gpio_set_value(fep->phy_reset_gpio, 0);
> +		msleep(fep->reset_duration);
> +		gpio_set_value(fep->phy_reset_gpio, 1);
> +	}

Drop the comment. It's obvious why it's a good idea to check for a valid
gpio.

Sascha

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