netdev - Re: [PATCH] net: phy: at803x: disable delay only for RGMII mode

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Message-ID: <20190213132900.GA24589@lunn.ch>
Date:   Wed, 13 Feb 2019 14:29:00 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Niklas Cassel <niklas.cassel@...aro.org>
Cc:     Vinod Koul <vkoul@...nel.org>,
        David S Miller <davem@...emloft.net>,
        linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        netdev@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
        "Nori, Sekhar" <nsekhar@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Marc Gonzalez <marc.w.gonzalez@...e.fr>
Subject: Re: [PATCH] net: phy: at803x: disable delay only for RGMII mode

> So we have these modes:
> 
> PHY_INTERFACE_MODE_RGMII: TX and RX delays disabled
> PHY_INTERFACE_MODE_RGMII_ID: TX and RX delays enabled
> PHY_INTERFACE_MODE_RGMII_RXID: RX delay enabled, TX delay disabled
> PHY_INTERFACE_MODE_RGMII_TXID: TX delay enabled, RX delay disabled
> 
> What I don't like with this patch, is that if we specify phy-mode
> PHY_INTERFACE_MODE_RGMII_TXID, this patch will enable TX delay,
> but RX delay will not be explicitly set.

That is not the behaviour we want. It is best to assume the device is
in a random state, and correctly enable/disable all delays as
requested. Only leave the hardware alone if PHY_INTERFACE_MODE_NA is
used.

     Andrew