netdev - Re: [PATCH v2 net-next] net: phy: microchip: run phy initialization during each link update

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Date:   Mon, 23 Jan 2023 14:06:53 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Rakesh Sankaranarayanan <rakesh.sankaranarayanan@...rochip.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        arun.ramadoss@...rochip.com, UNGLinuxDriver@...rochip.com,
        hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Subject: Re: [PATCH v2 net-next] net: phy: microchip: run phy initialization
 during each link update

On Fri, Jan 20, 2023 at 04:17:33PM +0530, Rakesh Sankaranarayanan wrote:
> PHY initialization is supposed to run on every mode changes.
> "lan87xx_config_aneg()" verifies every mode change using
> "phy_modify_changed()" function. Earlier code had phy_modify_changed()
> followed by genphy_soft_reset. But soft_reset resets all the
> pre-configured register values to default state, and lost all the
> initialization done. With this reason gen_phy_reset was removed.
> But it need to go through init sequence each time the mode changed.
> Update lan87xx_config_aneg() to invoke phy_init once successful mode
> update is detected.
> 
> PHY init sequence added in lan87xx_phy_init() have slave init
> commands executed every time. Update the init sequence to run
> slave init only if phydev is in slave mode.
> 
> Test setup contains LAN9370 EVB connected to SAMA5D3 (Running DSA),
> and issue can be reproduced by connecting link to any of the available
> ports after SAMA5D3 boot-up. With this issue, port will fail to
> update link state. But once the SAMA5D3 is reset with LAN9370 link in
> connected state itself, on boot-up link state will be reported as UP. But
> Again after some time, if link is moved to DOWN state, it will not get
> reported.
> 
> Signed-off-by: Rakesh Sankaranarayanan <rakesh.sankaranarayanan@...rochip.com>

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

    Andrew