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net: systemport: only update UMAC_CMD if something changed 

The link adjustment callback can be called as frequently as desired by
the PHY library, as such, let's avoid doing a Read/Modify/Write sequence
if nothing changed, which is more than likely since we are interfaced
with a switch device.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2014-05-14 19:32:13 -07:00 committed by David S. Miller
parent 5f47dfb400
commit d5e32cc7c9
1 changed files with 6 additions and 5 deletions
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11
drivers/net/ethernet/broadcom/bcmsysport.c
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@ -959,15 +959,16 @@ static void bcm_sysport_adj_link(struct net_device *dev)
if (!phydev->pause)
cmd_bits |= CMD_RX_PAUSE_IGNORE | CMD_TX_PAUSE_IGNORE;
reg = umac_readl(priv, UMAC_CMD);
reg &= ~((CMD_SPEED_MASK << CMD_SPEED_SHIFT) |
if (changed) {
reg = umac_readl(priv, UMAC_CMD);
reg &= ~((CMD_SPEED_MASK << CMD_SPEED_SHIFT) |
CMD_HD_EN | CMD_RX_PAUSE_IGNORE |
CMD_TX_PAUSE_IGNORE);
reg |= cmd_bits;
umac_writel(priv, reg, UMAC_CMD);
reg |= cmd_bits;
umac_writel(priv, reg, UMAC_CMD);
if (changed)
phy_print_status(priv->phydev);
}
}
static int bcm_sysport_init_tx_ring(struct bcm_sysport_priv *priv,