netdev - Re: [RFC net-next v3 3/3] net: dsa: microchip: implement PHY loopback configuration for KSZ8794 and KSZ8873

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Date: Tue, 16 Jan 2024 02:50:40 +0000
From: <Arun.Ramadoss@...rochip.com>
To: <andrew@...n.ch>, <olteanv@...il.com>, <davem@...emloft.net>,
	<Woojung.Huh@...rochip.com>, <pabeni@...hat.com>, <o.rempel@...gutronix.de>,
	<edumazet@...gle.com>, <f.fainelli@...il.com>, <kuba@...nel.org>
CC: <kernel@...gutronix.de>, <linux-kernel@...r.kernel.org>,
	<netdev@...r.kernel.org>, <UNGLinuxDriver@...rochip.com>
Subject: Re: [RFC net-next v3 3/3] net: dsa: microchip: implement PHY loopback
 configuration for KSZ8794 and KSZ8873

On Fri, 2024-01-12 at 15:07 +0100, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
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> 
> Correct the PHY loopback bit handling in the ksz8_w_phy_bmcr and
> ksz8_r_phy_bmcr functions for KSZ8794 and KSZ8873 variants in the
> ksz8795
> driver. Previously, the code erroneously used Bit 7 of port register
> 0xD
> for both chip variants, which is actually for LED configuration. This
> update ensures the correct registers and bits are used for the PHY
> loopback feature:
> 
> - For KSZ8794: Use 0xF / Bit 7.
> - For KSZ8873: Use 0xD / Bit 0.
> 
> The lack of loopback support was seen on KSZ8873 system by using
> "ethtool -t lanX". After this patch, the ethtool selftest will work,
> but only if port is not part of a bridge.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>

Acked-by: Arun Ramadoss <arun.ramadoss@...rochip.com>