netdev - Re: [PATCH 3/3] net-next: mediatek: add RX delay support

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Date:	Thu, 5 May 2016 19:37:35 +0200
From:	John Crispin <john@...ozen.org>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	netdev@...r.kernel.org, linux-mediatek@...ts.infradead.org,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, nbd@....name
Subject: Re: [PATCH 3/3] net-next: mediatek: add RX delay support



On 05/05/2016 14:13, Andrew Lunn wrote:
> On Thu, May 05, 2016 at 11:17:36AM +0200, John Crispin wrote:
>> If an external Gigabit PHY is connected to either of the MACs we need to
>> tell the to use a RX delay. Not doing so will result in heavy packet loss
>> and/or data corruption of RX traffic.
> 
> Hi John
> 
> Is this comment correct? Reading the code, all this switch statement
> does is select between RGMII, MII and RMII. It has nothing to do with
> delay. I suspect the PHY is doing the delay, not the MAC, since you
> pass the phy mode to of_phy_connect().
> 
> If my interpretation of the code is correct, you might also want to
> handle PHY_INTERFACE_MODE_RGMII_TXID and PHY_INTERFACE_MODE_RGMII_ID
> which are also RGMII modes.
> 
>       Andrew

Hi Andrew,

the comment is indeed incorrect and the PHY needs to handle the delay. i
will send a V2 and also add _TXID and _ID

	John