linux-kernel - Re: [PATCH v3 3/3] net: phy: dp83867: Recover from "port mirroring" N/A MODE4

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Message-ID: <20170207130400.GD31560@lunn.ch>
Date:   Tue, 7 Feb 2017 14:04:00 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Lukasz Majewski <lukma@...x.de>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Karicheri Muralidharan <m-karicheri2@...com>,
        linux-kernel@...r.kernel.org, Eric Engestrom <eric@...estrom.ch>,
        netdev@...r.kernel.org, Kishon Vijay Abraham I <kishon@...com>,
        Grygorii Strashko <grygorii.strashko@...com>
Subject: Re: [PATCH v3 3/3] net: phy: dp83867: Recover from "port mirroring"
 N/A MODE4

On Tue, Feb 07, 2017 at 06:20:24AM +0100, Lukasz Majewski wrote:
> The DP83867 when not properly bootstrapped - especially with LED_0 pin -
> can enter N/A MODE4 for "port mirroring" feature.
> 
> To provide normal operation of the PHY, one needs not only to explicitly
> disable the port mirroring feature, but as well stop some IC internal
> testing (which disables RGMII communication).
> 
> To do that the STRAP_STS1 (0x006E) register must be read and RESERVED bit
> 11 examined. When it is set, the another RESERVED bit (11) at PHYCR
> (0x0010) register must be clear to disable testing mode and enable RGMII
> communication.
> 
> Thorough explanation of the problem can be found at following e2e thread:
> "DP83867IR: Problem with RESERVED bits in PHY Control Register (PHYCR) -
> Linux driver"
> 
> https://e2e.ti.com/support/interface/ethernet/f/903/p/571313/2096954#2096954
> 
> Signed-off-by: Lukasz Majewski <lukma@...x.de>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew