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From: Russell King - ARM Linux <linux@armlinux.org.uk>
To: Antoine Tenart <antoine.tenart@bootlin.com>
Cc: davem@davemloft.net, kishon@ti.com, gregory.clement@bootlin.com,
	andrew@lunn.ch, jason@lakedaemon.net,
	sebastian.hesselbarth@gmail.com, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org, thomas.petazzoni@bootlin.com,
	maxime.chevallier@bootlin.com, miquel.raynal@bootlin.com,
	nadavh@marvell.com, stefanc@marvell.com, ymarkman@marvell.com,
	mw@semihalf.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH net-next v2 03/13] net: phy: sfp: warn the user when no tx_disable pin is available
Date: Tue, 8 May 2018 12:53:32 +0100	[thread overview]
Message-ID: <20180508115332.GG16141@n2100.armlinux.org.uk> (raw)
In-Reply-To: <20180504135643.23466-4-antoine.tenart@bootlin.com>

On Fri, May 04, 2018 at 03:56:33PM +0200, Antoine Tenart wrote:
> In case no Tx disable pin is available the SFP modules will always be
> emitting. This could be an issue when using modules using laser as their
> light source as we would have no way to disable it when the fiber is
> removed. This patch adds a warning when registering an SFP cage which do
> not have its tx_disable pin wired or available.
> 
> Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>

Looks fine, thanks.

Acked-by: Russell King <rmk+kernel@armlinux.org.uk>

> ---
>  drivers/net/phy/sfp.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
> index 8e323a4b70da..d4f503b2e3e2 100644
> --- a/drivers/net/phy/sfp.c
> +++ b/drivers/net/phy/sfp.c
> @@ -1093,6 +1093,15 @@ static int sfp_probe(struct platform_device *pdev)
>  	if (!sfp->gpio[GPIO_MODDEF0] && !sfp->gpio[GPIO_LOS])
>  		sfp->sm_dev_state = SFP_DEV_UNKNOWN;
>  
> +	/* We could have an issue in cases no Tx disable pin is available or
> +	 * wired as modules using a laser as their light source will continue to
> +	 * be active when the fiber is removed. This could be a safety issue and
> +	 * we should at least warn the user about that.
> +	 */
> +	if (!sfp->gpio[GPIO_TX_DISABLE])
> +		dev_warn(sfp->dev,
> +			 "No tx_disable pin: SFP modules will always be emitting.\n");
> +
>  	return 0;
>  }
>  
> -- 
> 2.17.0
> 

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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According to speedtest.net: 8.21Mbps down 510kbps up

  parent reply	other threads:[~2018-05-08 11:53 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-04 13:56 [PATCH net-next v2 00/13] net: mvpp2: phylink conversion Antoine Tenart
2018-05-04 13:56 ` [PATCH net-next v2 01/13] net: phy: sfp: make the i2c-bus property really optional Antoine Tenart
2018-05-04 17:03   ` Florian Fainelli
2018-05-04 17:19     ` Antoine Tenart
2018-05-04 13:56 ` [PATCH net-next v2 02/13] net: phy: sfp: handle non-wired SFP connectors Antoine Tenart
2018-05-04 17:04   ` Florian Fainelli
2018-05-04 17:17     ` Andrew Lunn
2018-05-04 17:23     ` Antoine Tenart
2018-05-05 15:39       ` Thomas Petazzoni
2018-05-05 17:48         ` Andrew Lunn
2018-05-08 11:52   ` Russell King - ARM Linux
2018-05-14  9:26     ` Antoine Tenart
2018-05-04 13:56 ` [PATCH net-next v2 03/13] net: phy: sfp: warn the user when no tx_disable pin is available Antoine Tenart
2018-05-04 17:07   ` Florian Fainelli
2018-05-04 17:14     ` Andrew Lunn
2018-05-05 20:38       ` Florian Fainelli
2018-05-05 20:52         ` Andrew Lunn
2018-05-08 12:45           ` Russell King - ARM Linux
2018-05-08 11:53   ` Russell King - ARM Linux [this message]
2018-05-04 13:56 ` [PATCH net-next v2 04/13] net: mvpp2: align the ethtool ops definition Antoine Tenart
2018-05-04 13:56 ` [PATCH net-next v2 05/13] net: mvpp2: phylink support Antoine Tenart
2018-05-04 13:56 ` [PATCH net-next v2 06/13] phy: add 2.5G SGMII mode to the phy_mode enum Antoine Tenart
2018-05-08 12:34   ` Russell King - ARM Linux
2018-05-14  8:37     ` Antoine Tenart
2018-05-04 13:56 ` [PATCH net-next v2 07/13] phy: cp110-comphy: 2.5G SGMII mode Antoine Tenart
2018-05-04 13:56 ` [PATCH net-next v2 08/13] net: mvpp2: 1000baseX support Antoine Tenart
2018-05-04 13:56 ` [PATCH net-next v2 09/13] net: mvpp2: 2500baseX support Antoine Tenart
2018-05-04 13:56 ` [PATCH net-next v2 10/13] arm64: dts: marvell: mcbin: add 10G SFP support Antoine Tenart
2018-05-04 13:56 ` [PATCH net-next v2 11/13] arm64: dts: marvell: mcbin: enable the fourth network interface Antoine Tenart
2018-05-04 13:56 ` [PATCH net-next v2 12/13] arm64: dts: marvell: 7040-db: describe the 10G SFP cage Antoine Tenart
2018-05-04 13:56 ` [PATCH net-next v2 13/13] arm64: dts: marvell: 8040-db: describe the 10G SFP cages Antoine Tenart
2018-05-08  3:18 ` [PATCH net-next v2 00/13] net: mvpp2: phylink conversion David Miller

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