From: "Russell King (Oracle)" <linux@armlinux•org.uk>
To: Vladimir Oltean <olteanv@gmail•com>
Cc: Jakub Kicinski <kuba@kernel•org>,
"David S. Miller" <davem@davemloft•net>,
netdev@vger•kernel.org, Florian Fainelli <f.fainelli@gmail•com>,
Andrew Lunn <andrew@lunn•ch>,
Heiner Kallweit <hkallweit1@gmail•com>,
Radu Pirea <radu-nicolae.pirea@oss•nxp.com>,
Vladimir Oltean <vladimir.oltean@nxp•com>
Subject: Re: [PATCH v2 net-next 3/3] net: phy: nxp-c45-tja11xx: enable MDIO write access to the master/slave registers
Date: Mon, 14 Jun 2021 13:51:09 +0100 [thread overview]
Message-ID: <20210614125108.GT22278@shell.armlinux.org.uk> (raw)
In-Reply-To: <20210614123815.443467-4-olteanv@gmail.com>
On Mon, Jun 14, 2021 at 03:38:15PM +0300, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@nxp•com>
>
> The SJA1110 switch integrates TJA1103 PHYs, but in SJA1110 switch rev B
> silicon, there is a bug in that the registers for selecting the 100base-T1
> autoneg master/slave roles are not writable.
>
> To enable write access to the master/slave registers, these additional
> PHY writes are necessary during initialization.
>
> The issue has been corrected in later SJA1110 silicon versions and is
> not present in the standalone PHY variants, but applying the workaround
> unconditionally in the driver should not do any harm.
>
> Suggested-by: Radu Pirea (NXP OSS) <radu-nicolae.pirea@oss•nxp.com>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp•com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux•org.uk>
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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prev parent reply other threads:[~2021-06-14 12:51 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-14 12:38 [PATCH v2 net-next 0/3] Fixes and improvements to TJA1103 PHY driver Vladimir Oltean
2021-06-14 12:38 ` [PATCH v2 net-next 1/3] net: phy: nxp-c45-tja11xx: demote the "no PTP support" message to debug Vladimir Oltean
2021-06-14 12:47 ` Russell King (Oracle)
2021-06-14 12:38 ` [PATCH v2 net-next 2/3] net: phy: nxp-c45-tja11xx: fix potential RX timestamp wraparound Vladimir Oltean
2021-06-14 12:59 ` Russell King (Oracle)
2021-06-14 12:38 ` [PATCH v2 net-next 3/3] net: phy: nxp-c45-tja11xx: enable MDIO write access to the master/slave registers Vladimir Oltean
2021-06-14 12:51 ` Russell King (Oracle) [this message]
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