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net: mvpp2: cycle comphy to power it down

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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>
This commit is contained in:
Russell King 2019-12-17 15:47:36 +00:00 committed by David S. Miller
parent 0dea4d039a
commit 6791c10260
1 changed files with 10 additions and 0 deletions
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10
drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
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@ -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");