netdev - Re: [PATCH net-next 6/7] net/faraday: Fix phy link irq on Aspeed G5 SoCs

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Message-ID: <d4433fc6-1cda-3631-3fda-e3f41d05f27e@cogentembedded.com>
Date:   Tue, 20 Sep 2016 15:14:03 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Joel Stanley <joel@....id.au>, davem@...emloft.net
Cc:     gwshan@...ux.vnet.ibm.com, andrew@...n.ch, andrew@...id.au,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        benh@...nel.crashing.org
Subject: Re: [PATCH net-next 6/7] net/faraday: Fix phy link irq on Aspeed G5
 SoCs

Hello.

On 9/20/2016 9:30 AM, Joel Stanley wrote:

> On Aspeed SoC with a direct PHY connection (non-NSCI), we receive
> continual PHYSTS interrupts:
>
>  [   20.280000] ftgmac100 1e660000.ethernet eth0: [ISR] = 0x200: PHYSTS_CHG
>  [   20.280000] ftgmac100 1e660000.ethernet eth0: [ISR] = 0x200: PHYSTS_CHG
>  [   20.280000] ftgmac100 1e660000.ethernet eth0: [ISR] = 0x200: PHYSTS_CHG
>  [   20.300000] ftgmac100 1e660000.ethernet eth0: [ISR] = 0x200: PHYSTS_CHG
>
> This is because the driver was enabling low-level sensitive interrupt
> generation where the systems are wired for high-level. All CPU cycles
> are spent servicing this interrupt.
>
> Signed-off-by: Joel Stanley <joel@....id.au>
> ---
>  drivers/net/ethernet/faraday/ftgmac100.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
> index 7ba0f2d58a8b..5466df028381 100644
> --- a/drivers/net/ethernet/faraday/ftgmac100.c
> +++ b/drivers/net/ethernet/faraday/ftgmac100.c
> @@ -223,6 +223,10 @@ static void ftgmac100_start_hw(struct ftgmac100 *priv, int speed)
>  {
>  	int maccr = MACCR_ENABLE_ALL;
>
> +	if (of_machine_is_compatible("aspeed,ast2500")) {
> +		maccr &= ~FTGMAC100_MACCR_PHY_LINK_LEVEL;
> +	}

    {} not needed here.

[...]

MBR, Sergei