netdev - Re: [PATCH 1/2] net: phy: at803x: Fix RGMII RX and TX clock delays setup

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Date:   Wed, 19 Jul 2017 14:24:10 -0500
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Marc Gonzalez <marc_gonzalez@...madesigns.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>, Mans Rullgard <mans@...sr.com>,
        Martin Blumenstingl <martin.blumenstingl@...il.com>,
        Fabio Estevam <fabio.estevam@....com>,
        Zefir Kurtisi <zefir.kurtisi@...atec.com>,
        Timur Tabi <timur@...eaurora.org>,
        Daniel Mack <zonque@...il.com>, Sekhar Nori <nsekhar@...com>
CC:     netdev <netdev@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "David S. Miller" <davem@...emloft.net>,
        Thibaud Cornic <thibaud_cornic@...madesigns.com>,
        Mason <slash.tmp@...e.fr>
Subject: Re: [PATCH 1/2] net: phy: at803x: Fix RGMII RX and TX clock delays
 setup

Hi

On 07/19/2017 10:31 AM, Marc Gonzalez wrote:
> The current code supports enabling RGMII RX and TX clock delays.
> The unstated assumption is that these settings are disabled by
> default at reset, which is not the case.
> 
> RX clock delay is enabled at reset. And TX clock delay "survives"
> across SW resets. Thus, if the bootloader enables TX clock delay,
> it will remain enabled at reset in Linux.
> 
> Provide disable functions to configure the RGMII clock delays
> exactly as specified in the fwspec.
> 
> Signed-off-by: Marc Gonzalez <marc_gonzalez@...madesigns.com>
> ---
>   drivers/net/phy/at803x.c | 32 ++++++++++++++++++++++++--------
>   1 file changed, 24 insertions(+), 8 deletions(-)
This patch breaks am335x-evm networking.

To restore it I've had to apply below diff:
diff --git a/arch/arm/boot/dts/am335x-evm.dts b/arch/arm/boot/dts/am335x-evm.dts
index 200d6ab..9578bdf 100644
--- a/arch/arm/boot/dts/am335x-evm.dts
+++ b/arch/arm/boot/dts/am335x-evm.dts
@@ -724,12 +724,12 @@
 
 &cpsw_emac0 {
        phy_id = <&davinci_mdio>, <0>;
-       phy-mode = "rgmii-txid";
+       phy-mode = "rgmii-id";
 };
 
 &cpsw_emac1 {
        phy_id = <&davinci_mdio>, <1>;
-       phy-mode = "rgmii-txid";
+       phy-mode = "rgmii-id";
 };
 
 &tscadc {

Sry, can't comment here to much - not E-PHY expert.

-- 
regards,
-grygorii