netdev - [PATCH (net-next.git) 14/18] stmmac: do not poll phy handler when attach a switch

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Date:	Mon, 4 Jan 2016 14:06:59 +0100
From:	Giuseppe Cavallaro <peppe.cavallaro@...com>
To:	<netdev@...r.kernel.org>
CC:	<alexandre.torgue@...com>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>
Subject: [PATCH (net-next.git) 14/18] stmmac: do not poll phy handler when attach a switch

This patch avoids to call the stmmac_adjust_link when
the driver is connected to a switch by using the FIXED_PHY
support. Prior this patch the phydev->irq was set as PHY_POLL
so periodically the phy handler was invoked spending useless
time because the link cannot actually change.
Note that the stmmac_adjust_link will be called just one
time and this guarantees that the ST glue logic will be
setup according to the mode and speed fixed.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 4a75f79..76ca54c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -881,6 +881,11 @@ static int stmmac_init_phy(struct net_device *dev)
 		phy_disconnect(phydev);
 		return -ENODEV;
 	}
+
+	/* If attached to a switch, there is no reason to poll phy handler */
+	if (!strcmp(priv->plat->phy_bus_name, "fixed"))
+		phydev->irq = PHY_IGNORE_INTERRUPT;
+
 	pr_debug("stmmac_init_phy:  %s: attached to PHY (UID 0x%x)"
 		 " Link = %d\n", dev->name, phydev->phy_id, phydev->link);
 
-- 
1.7.4.4

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