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authorRussell King <rmk+kernel@armlinux.org.uk>2019-12-17 15:47:36 +0000
committerDavid S. Miller <davem@davemloft.net>2019-12-19 17:27:29 -0800
commit6791c102602b428b729890f6a38a319dfe225aba (patch)
treebcb4e603c154bf4ff681f617c1ddd3cc225e7bb2
parentnet: sfp: report error on failure to read sfp soft status (diff)
downloadlinux-dev-6791c102602b428b729890f6a38a319dfe225aba.tar.xz
linux-dev-6791c102602b428b729890f6a38a319dfe225aba.zip
net: mvpp2: cycle comphy to power it down
Presently, at boot time, the comphys are enabled. For firmware compatibility reasons, the comphy driver does not power down the comphys at boot. Consequently, the ethernet comphys are left active until the network interfaces are brought through an up/down cycle. If the port is never used, the port wastes power needlessly. Arrange for the ethernet comphys to be cycled by the mvpp2 driver as if the interface went through an up/down cycle during driver probe, thereby powering them down. This saves: 270mW per 10G SFP+ port on the Macchiatobin Single Shot (eth0/eth1) 370mW per 10G PHY port on the Macchiatobin Double Shot (eth0/eth1) 160mW on the SFP port on either Macchiatobin flavour (eth3) Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Acked-by: Antoine Tenart <antoine.tenart@bootlin.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
index 3d9eb5747d9e..28eba99888c3 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
@@ -5425,6 +5425,16 @@ static int mvpp2_port_probe(struct platform_device *pdev,
port->phylink = NULL;
}
+ /* Cycle the comphy to power it down, saving 270mW per port -
+ * don't worry about an error powering it up. When the comphy
+ * driver does this, we can remove this code.
+ */
+ if (port->comphy) {
+ err = mvpp22_comphy_init(port);
+ if (err == 0)
+ phy_power_off(port->comphy);
+ }
+
err = register_netdev(dev);
if (err < 0) {
dev_err(&pdev->dev, "failed to register netdev\n");