netdev - Re: LAN8720: RX errors / packet loss when using smsc PHY driver on i.MX6Q

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Message-ID: <CAOMZO5CbNEspuYTUVfMysNkzzMXgTZaRxCTKSXfT0=WmoK=i5Q@mail.gmail.com>
Date: Sat, 15 Nov 2025 18:01:38 -0300
From: Fabio Estevam <festevam@...il.com>
To: Heiner Kallweit <hkallweit1@...il.com>
Cc: Russell King - ARM Linux <linux@...linux.org.uk>, edumazet <edumazet@...gle.com>, 
	netdev <netdev@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>
Subject: Re: LAN8720: RX errors / packet loss when using smsc PHY driver on i.MX6Q

Hi Heiner,

On Fri, Nov 14, 2025 at 6:33 PM Heiner Kallweit <hkallweit1@...il.com> wrote:

> The smsc PHY driver for LAN8720 has a number of callbacks and flags.
> Try commenting them out one after the other until it works.
>
> .read_status    = lan87xx_read_status,
> .config_init    = smsc_phy_config_init,
> .soft_reset     = smsc_phy_reset,
> .config_aneg    = lan95xx_config_aneg_ext,
> .suspend        = genphy_suspend,
> .resume         = genphy_resume,
> .flags          = PHY_RST_AFTER_CLK_EN,
>
> All of them are optional. If all are commented out, you should have
> the behavior of the genphy driver.
>
> Once we know which callback is problematic, we have a starting point.

Thanks for the suggestion.

After removing the '.soft_reset = smsc_phy_reset,' line, there is no
packet loss anymore.

If you have any other suggestions regarding smsc_phy_reset(), please
let me know.

Thanks