netdev - Re: [PATCH] sky2: Use 32bit read to read Y2_VAUX

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Message-ID: <20090901085757.47b5c09c@nehalam>
Date:	Tue, 1 Sep 2009 08:57:57 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Mike McCormack <mikem@...g3k.org>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] sky2: Use 32bit read to read Y2_VAUX_AVAIL

On Tue, 01 Sep 2009 22:54:27 +0900
Mike McCormack <mikem@...g3k.org> wrote:

> B0_CTST is a 24bit register according to the vendor driver (sk98lin).
> A 16bit read on B0_CTST will always return 0 for Y2_VAUX_AVAIL (1<<16),
>  so use a 32bit read when testing Y2_VAUX_AVAIL
> 
> Signed-off-by: Mike McCormack <mikem@...g3k.org>
> ---
>  drivers/net/sky2.c |    2 +-
>  drivers/net/sky2.h |    2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
> index 7108b12..d1f3b46 100644
> --- a/drivers/net/sky2.c
> +++ b/drivers/net/sky2.c
> @@ -273,7 +273,7 @@ static void sky2_power_aux(struct sky2_hw *hw)
>  			    Y2_COR_CLK_LNK2_DIS | Y2_CLK_GAT_LNK2_DIS);
>  
>  	/* switch power to VAUX */
> -	if (sky2_read16(hw, B0_CTST) & Y2_VAUX_AVAIL)
> +	if (sky2_read32(hw, B0_CTST) & Y2_VAUX_AVAIL)
>  		sky2_write8(hw, B0_POWER_CTRL,
>  			    (PC_VAUX_ENA | PC_VCC_ENA |
>  			     PC_VAUX_ON | PC_VCC_OFF));
> diff --git a/drivers/net/sky2.h b/drivers/net/sky2.h
> index 34042ff..e0f23a1 100644
> --- a/drivers/net/sky2.h
> +++ b/drivers/net/sky2.h
> @@ -260,7 +260,7 @@ enum csr_regs {
>  	Y2_CFG_AER      = 0x1d00,	/* PCI Advanced Error Report region */
>  };
>  
> -/*	B0_CTST			16 bit	Control/Status register */
> +/*	B0_CTST			24 bit	Control/Status register */
>  enum {
>  	Y2_VMAIN_AVAIL	= 1<<17,/* VMAIN available (YUKON-2 only) */
>  	Y2_VAUX_AVAIL	= 1<<16,/* VAUX available (YUKON-2 only) */


Acked-by: Stephen Hemminger <shemminger@...tta.com>


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