linux-kernel - Re: [PATCH] net: phy: micrel: workaround to NAND_Tree# incorrectly strapp-in during the reset period.

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Message-ID: <54853268.6030701@gmail.com>
Date:	Sun, 07 Dec 2014 21:08:56 -0800
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Wenyou Yang <wenyou.yang@...el.com>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	nicolas.ferre@...el.com,
	linux-arm-kernel-bounces@...ts.infradead.org, johan@...nel.org
Subject: Re: [PATCH] net: phy: micrel: workaround to NAND_Tree# incorrectly
 strapp-in during the reset period.

Le 07/12/2014 19:35, Wenyou Yang a écrit :
> Appearance: On some boards, after power up, the Ethernet doesn't work.
> 
> Reason: On the SAMA5D4EK, the PIOE2 pin is connected to the NAND_Tree# of KSZ8081,
> But it outputs LOW during the reset period, which cause the NAND_Tree# enabled.
> 
> Workaround: In the .config_init(), add code to disable NAND_Tree#
> by operating Operation Mode Strap Override(i.e. Register 16h).

Your patch won't apply cleanly to the net-next tree where the PHY
drivers development is happening, especially not after Johan's recent
changes.

Is not what you are looking for a phy_fixup() rather than clearing this
bit for all Micrel PHYs?

> 
> Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>
> ---
>  drivers/net/phy/micrel.c |    8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
> index 8c2a29a..11d72cb 100644
> --- a/drivers/net/phy/micrel.c
> +++ b/drivers/net/phy/micrel.c
> @@ -31,6 +31,7 @@
>  /* Operation Mode Strap Override */
>  #define MII_KSZPHY_OMSO				0x16
>  #define KSZPHY_OMSO_B_CAST_OFF			(1 << 9)
> +#define KSZPHY_OMSO_NAND_TREE_OVERRIDE		(1 << 5)
>  #define KSZPHY_OMSO_RMII_OVERRIDE		(1 << 1)
>  #define KSZPHY_OMSO_MII_OVERRIDE		(1 << 0)
>  
> @@ -180,7 +181,12 @@ static int kszphy_setup_led(struct phy_device *phydev,
>  
>  static int kszphy_config_init(struct phy_device *phydev)
>  {
> -	return 0;
> +	int rc;
> +
> +	phy_write(phydev, MII_KSZPHY_OMSO, phy_read(phydev, MII_KSZPHY_OMSO)
> +			& (~KSZPHY_OMSO_NAND_TREE_OVERRIDE));
> +	rc = ksz_config_flags(phydev);
> +	return rc < 0 ? rc : 0;
>  }
>  
>  static int kszphy_config_init_led8041(struct phy_device *phydev)
> 

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