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From: Antoine Tenart <antoine.tenart@bootlin.com>
To: davem@davemloft.net, kishon@ti.com, linux@armlinux.org.uk,
	gregory.clement@bootlin.com, andrew@lunn.ch,
	jason@lakedaemon.net, sebastian.hesselbarth@gmail.com
Cc: Antoine Tenart <antoine.tenart@bootlin.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: [PATCH net-next v2 02/13] net: phy: sfp: handle non-wired SFP connectors
Date: Fri,  4 May 2018 15:56:32 +0200	[thread overview]
Message-ID: <20180504135643.23466-3-antoine.tenart@bootlin.com> (raw)
In-Reply-To: <20180504135643.23466-1-antoine.tenart@bootlin.com>

SFP connectors can be solder on a board without having any of their pins
(LOS, i2c...) wired. In such cases the SFP link state cannot be guessed,
and the overall link status reporting is left to other layers.

In order to achieve this, a new SFP_DEV status is added, named UNKNOWN.
This mode is set when it is not possible for the SFP code to get the
link status and as a result the link status is reported to be always UP
from the SFP point of view.

Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
---
 drivers/net/phy/sfp.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 4686c443fc22..8e323a4b70da 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -48,6 +48,7 @@ enum {
 
 	SFP_DEV_DOWN = 0,
 	SFP_DEV_UP,
+	SFP_DEV_UNKNOWN,
 
 	SFP_S_DOWN = 0,
 	SFP_S_INIT,
@@ -737,6 +738,15 @@ static void sfp_sm_event(struct sfp *sfp, unsigned int event)
 			sfp->sm_dev_state = SFP_DEV_DOWN;
 		}
 		break;
+
+	case SFP_DEV_UNKNOWN:
+		/* We can't know the state of the SFP link. Report the
+		 * link as being up as its status has to be guessed by
+		 * other layers.
+		 */
+		if (event != SFP_E_DEV_UP)
+			sfp_link_up(sfp->sfp_bus);
+		break;
 	}
 
 	/* Some events are global */
@@ -1077,6 +1087,12 @@ static int sfp_probe(struct platform_device *pdev)
 	if (poll)
 		mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
 
+	/* We won't be able to know the state of the SFP link, report it as
+	 * unknown.
+	 */
+	if (!sfp->gpio[GPIO_MODDEF0] && !sfp->gpio[GPIO_LOS])
+		sfp->sm_dev_state = SFP_DEV_UNKNOWN;
+
 	return 0;
 }
 
-- 
2.17.0

  parent reply	other threads:[~2018-05-04 14:00 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 ` Antoine Tenart [this message]
2018-05-04 17:04   ` [PATCH net-next v2 02/13] net: phy: sfp: handle non-wired SFP connectors 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
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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