linux-kernel - Re: [PATCH v2 13/13] net: phy: nxp-c45-tja11xx: reset PCS if the link goes down

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Message-ID: <0c2033a2-beb9-47ce-92f6-3c700e7980fc@lunn.ch>
Date:   Sat, 24 Jun 2023 21:33:03 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     "Radu Pirea (NXP OSS)" <radu-nicolae.pirea@....nxp.com>
Cc:     hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        richardcochran@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, sebastian.tobuschat@....com
Subject: Re: [PATCH v2 13/13] net: phy: nxp-c45-tja11xx: reset PCS if the
 link goes down

On Fri, Jun 23, 2023 at 10:41:23AM +0300, Radu Pirea (NXP OSS) wrote:
> During PTP testing on early TJA1120 engineering samples I observed that
> if the link is lost and recovered, the tx timestamps will be randomly
> lost. To avoid this HW issue, the PCS should be reseted.
> 
> Resetting the PCS will break the link and we should reset the PCS on
> LINK UP -> LINK DOWN transition, otherwise we will trigger and infinite
> loop of LINK UP -> LINK DOWN events.
> 
> Signed-off-by: Radu Pirea (NXP OSS) <radu-nicolae.pirea@....nxp.com>

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

    Andrew