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From: Andrew Lunn <andrew@lunn.ch>
To: Ravi Gunasekaran <r-gunasekaran@ti.com>
Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
	pabeni@redhat.com, linux-omap@vger.kernel.org,
	netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	kishon@ti.com, vigneshr@ti.com, lkp@intel.com
Subject: Re: [PATCH v3 net-next] net: ethernet: ti: davinci_mdio: Add workaround for errata i2329
Date: Sat, 20 Aug 2022 21:57:26 +0200	[thread overview]
Message-ID: <YwE8pob0SOiHZ7K7@lunn.ch> (raw)
In-Reply-To: <20220817094406.10658-1-r-gunasekaran@ti.com>

On Wed, Aug 17, 2022 at 03:14:06PM +0530, Ravi Gunasekaran wrote:
> On the CPSW and ICSS peripherals, there is a possibility that the MDIO
> interface returns corrupt data on MDIO reads or writes incorrect data
> on MDIO writes. There is also a possibility for the MDIO interface to
> become unavailable until the next peripheral reset.
> 
> The workaround is to configure the MDIO in manual mode and disable the
> MDIO state machine and emulate the MDIO protocol by reading and writing
> appropriate fields in MDIO_MANUAL_IF_REG register of the MDIO controller
> to manipulate the MDIO clock and data pins.
> 
> More details about the errata i2329 and the workaround is available in:
> https://www.ti.com/lit/er/sprz487a/sprz487a.pdf
> 
> Add implementation to disable MDIO state machine, configure MDIO in manual
> mode and achieve MDIO read and writes via MDIO Bitbanging
> 
> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@ti.com>
> Reported-by: kernel test robot <lkp@intel.com>

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

    Andrew

WARNING: multiple messages have this Message-ID (diff)
From: Andrew Lunn <andrew@lunn.ch>
To: Ravi Gunasekaran <r-gunasekaran@ti.com>
Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
	pabeni@redhat.com, linux-omap@vger.kernel.org,
	netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	kishon@ti.com, vigneshr@ti.com, lkp@intel.com
Subject: Re: [PATCH v3 net-next] net: ethernet: ti: davinci_mdio: Add workaround for errata i2329
Date: Sat, 20 Aug 2022 21:57:26 +0200	[thread overview]
Message-ID: <YwE8pob0SOiHZ7K7@lunn.ch> (raw)
In-Reply-To: <20220817094406.10658-1-r-gunasekaran@ti.com>

On Wed, Aug 17, 2022 at 03:14:06PM +0530, Ravi Gunasekaran wrote:
> On the CPSW and ICSS peripherals, there is a possibility that the MDIO
> interface returns corrupt data on MDIO reads or writes incorrect data
> on MDIO writes. There is also a possibility for the MDIO interface to
> become unavailable until the next peripheral reset.
> 
> The workaround is to configure the MDIO in manual mode and disable the
> MDIO state machine and emulate the MDIO protocol by reading and writing
> appropriate fields in MDIO_MANUAL_IF_REG register of the MDIO controller
> to manipulate the MDIO clock and data pins.
> 
> More details about the errata i2329 and the workaround is available in:
> https://www.ti.com/lit/er/sprz487a/sprz487a.pdf
> 
> Add implementation to disable MDIO state machine, configure MDIO in manual
> mode and achieve MDIO read and writes via MDIO Bitbanging
> 
> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@ti.com>
> Reported-by: kernel test robot <lkp@intel.com>

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

    Andrew

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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2022-08-20 19:57 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-17  9:44 [PATCH v3 net-next] net: ethernet: ti: davinci_mdio: Add workaround for errata i2329 Ravi Gunasekaran
2022-08-17  9:44 ` Ravi Gunasekaran
2022-08-20 19:57 ` Andrew Lunn [this message]
2022-08-20 19:57   ` Andrew Lunn
2022-08-22 12:00 ` patchwork-bot+netdevbpf
2022-08-22 12:00   ` patchwork-bot+netdevbpf

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