linux-kernel - Re: [PATCH v3 net-next] net: ethernet: cadence-macb: Add disabled usrio caps

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Message-ID: <568A3A79.5070502@atmel.com>
Date:	Mon, 4 Jan 2016 10:25:13 +0100
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Neil Armstrong <narmstrong@...libre.com>, <davem@...emloft.net>,
	<harini.katakam@...inx.com>, <boris.brezillon@...e-electrons.com>,
	<alexandre.belloni@...e-electrons.com>,
	<linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
	<joshc@...com>
Subject: Re: [PATCH v3 net-next] net: ethernet: cadence-macb: Add disabled
 usrio caps

Le 04/01/2016 10:01, Neil Armstrong a écrit :
> On some platforms, the macb integration does not use the USRIO
> register to configure the (R)MII port and clocks.
> When the register is not implemented and the MACB error signal
> is connected to the bus error, reading or writing to the USRIO
> register can trigger some Imprecise External Aborts on ARM platforms.
> 
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> ---
>  drivers/net/ethernet/cadence/macb.c | 27 +++++++++++++++------------
>  drivers/net/ethernet/cadence/macb.h |  1 +
>  2 files changed, 16 insertions(+), 12 deletions(-)
> 
> Nicolas,
> I post only the first patch of the previous set posted here :
> http://lkml.kernel.org/r/1449582726-6148-1-git-send-email-narmstrong@baylibre.com
> to hopefully make it into the 4.5 merge time,
> I'll post the vendor prefix once this patch will hit mainline.

Okay, but I don't see how you will activate this capability (or I lost
track of it). So, before I can accept one solution, can you please
repost the whole solution as a v4.

Thanks. Bye,


> 
> Regards,
> Neil
> 
> diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
> index 8b45bc9..fa53bc3 100644
> --- a/drivers/net/ethernet/cadence/macb.c
> +++ b/drivers/net/ethernet/cadence/macb.c
> @@ -2124,7 +2124,8 @@ static void macb_get_regs(struct net_device *dev, struct ethtool_regs *regs,
>  	regs_buff[10] = macb_tx_dma(&bp->queues[0], tail);
>  	regs_buff[11] = macb_tx_dma(&bp->queues[0], head);
>  
> -	regs_buff[12] = macb_or_gem_readl(bp, USRIO);
> +	if (!(bp->caps & MACB_CAPS_USRIO_DISABLED))
> +		regs_buff[12] = macb_or_gem_readl(bp, USRIO);
>  	if (macb_is_gem(bp)) {
>  		regs_buff[13] = gem_readl(bp, DMACFG);
>  	}
> @@ -2403,19 +2404,21 @@ static int macb_init(struct platform_device *pdev)
>  		dev->hw_features &= ~NETIF_F_SG;
>  	dev->features = dev->hw_features;
>  
> -	val = 0;
> -	if (bp->phy_interface == PHY_INTERFACE_MODE_RGMII)
> -		val = GEM_BIT(RGMII);
> -	else if (bp->phy_interface == PHY_INTERFACE_MODE_RMII &&
> -		 (bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII))
> -		val = MACB_BIT(RMII);
> -	else if (!(bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII))
> -		val = MACB_BIT(MII);
> +	if (!(bp->caps & MACB_CAPS_USRIO_DISABLED)) {
> +		val = 0;
> +		if (bp->phy_interface == PHY_INTERFACE_MODE_RGMII)
> +			val = GEM_BIT(RGMII);
> +		else if (bp->phy_interface == PHY_INTERFACE_MODE_RMII &&
> +			 (bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII))
> +			val = MACB_BIT(RMII);
> +		else if (!(bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII))
> +			val = MACB_BIT(MII);
>  
> -	if (bp->caps & MACB_CAPS_USRIO_HAS_CLKEN)
> -		val |= MACB_BIT(CLKEN);
> +		if (bp->caps & MACB_CAPS_USRIO_HAS_CLKEN)
> +			val |= MACB_BIT(CLKEN);
>  
> -	macb_or_gem_writel(bp, USRIO, val);
> +		macb_or_gem_writel(bp, USRIO, val);
> +	}
>  
>  	/* Set MII management clock divider */
>  	val = macb_mdc_clk_div(bp);
> diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
> index 5c03e81..0d4ecfc 100644
> --- a/drivers/net/ethernet/cadence/macb.h
> +++ b/drivers/net/ethernet/cadence/macb.h
> @@ -400,6 +400,7 @@
>  #define MACB_CAPS_USRIO_HAS_CLKEN		0x00000002
>  #define MACB_CAPS_USRIO_DEFAULT_IS_MII		0x00000004
>  #define MACB_CAPS_NO_GIGABIT_HALF		0x00000008
> +#define MACB_CAPS_USRIO_DISABLED		0x00000010
>  #define MACB_CAPS_FIFO_MODE			0x10000000
>  #define MACB_CAPS_GIGABIT_MODE_AVAILABLE	0x20000000
>  #define MACB_CAPS_SG_DISABLED			0x40000000
> 


-- 
Nicolas Ferre
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