netdev - Re: [PATCH net-next 10/14] net: stmmac: hw->ps becomes hw->reverse_sgmii

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Message-ID: <7a935c07-4e1b-40c8-bf9f-00576fb465e7@lunn.ch>
Date: Wed, 15 Oct 2025 22:57:38 +0200
From: Andrew Lunn <andrew@...n.ch>
To: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Cc: Heiner Kallweit <hkallweit1@...il.com>,
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	Yu-Chun Lin <eleanor15x@...il.com>
Subject: Re: [PATCH net-next 10/14] net: stmmac: hw->ps becomes
 hw->reverse_sgmii_enable

On Wed, Oct 15, 2025 at 03:20:48PM +0100, Russell King (Oracle) wrote:
> After a lot of digging, it seems that the oddly named hw->ps member
> is all about setting the core into reverse SGMII speed. When set to
> a non-zero value, it:
> 
> 1. Configures the MAC at initialisation time to operate at a specific
>    speed.
> 2. It _incorrectly_ enables the transmitter (GMAC_CONFIG_TE) which
>    makes no sense, rather than enabling the "transmit configuration"
>    bit (GMAC_CONFIG_TC).
> 3. It configures the SGMII rate adapter layer to retrieve its speed
>    setting from the MAC configuration register rather than the PHY.
> 
> In the previous commit, we removed (1) and (2) as phylink overwrites
> the configuration set at that step.
> 
> Thus, the only functional aspect is (3), which is a boolean operation.
> This means there is no need to store the actual speed, and just have a
> boolean flag.
> 
> Convert the priv->ps member to a boolean, and rename it to
> priv->reverse_sgmii_enable to make it more understandable.
> 
> Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>

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

    Andrew