netdev - Re: [PATCH 3/4] net: phy: aquantia: Poll for TX ready at PHY system side

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Date: Wed, 28 Jun 2023 14:33:47 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Revanth Kumar Uppala <ruppala@...dia.com>
Cc: andrew@...n.ch, hkallweit1@...il.com, netdev@...r.kernel.org,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH 3/4] net: phy: aquantia: Poll for TX ready at PHY system
 side

On Wed, Jun 28, 2023 at 06:13:25PM +0530, Revanth Kumar Uppala wrote:
> +	/* Lane bring-up failures are seen during interface up, as interface
> +	 * speed settings are configured while the PHY is still initializing.
> +	 * To resolve this, poll until PHY system side interface gets ready
> +	 * and the interface speed settings are configured.
> +	 */
> +	ret = phy_read_mmd_poll_timeout(phydev, MDIO_MMD_PHYXS, MDIO_PHYXS_VEND_IF_STATUS,
> +					val, (val & MDIO_PHYXS_VEND_IF_STATUS_TX_READY),
> +					20000, 2000000, false);

What does this actually mean when the condition succeeds? Does it mean
that the system interface is now fully configured (but may or may not
have link)?

If that's correct, then that's fine. If it doesn't succeed because
the system interface doesn't have link, then that would be very bad,
because _this_ function needs to return so the MAC side can then be
configured to gain link with the PHY with the appropriate link
parameters.

The comment doesn't make it clear which it is.

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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