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net: mvpp2: only update the XLG configuration when needed 

This patch improves the XLG configuration function, to only update the
XLG configuration register when a change is needed. This helps not
writing over and over the same XLG configuration each time phylink
request the MAC to be configured. This mimics the GMAC configuration
function.

Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Antoine Tenart 2019-03-01 11:52:12 +01:00 committed by David S. Miller
parent 6b10bfc51c
commit f17e70d258
1 changed files with 8 additions and 5 deletions
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9
drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
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@ -4505,10 +4505,11 @@ static void mvpp2_mac_an_restart(struct net_device *dev)
static void mvpp2_xlg_config(struct mvpp2_port *port, unsigned int mode,
const struct phylink_link_state *state)
{
u32 ctrl0, ctrl4;
u32 old_ctrl0, ctrl0;
u32 old_ctrl4, ctrl4;
ctrl0 = readl(port->base + MVPP22_XLG_CTRL0_REG);
ctrl4 = readl(port->base + MVPP22_XLG_CTRL4_REG);
old_ctrl0 = ctrl0 = readl(port->base + MVPP22_XLG_CTRL0_REG);
old_ctrl4 = ctrl4 = readl(port->base + MVPP22_XLG_CTRL4_REG);
if (state->pause & MLO_PAUSE_TX)
ctrl0 |= MVPP22_XLG_CTRL0_TX_FLOW_CTRL_EN;
@ -4524,7 +4525,9 @@ static void mvpp2_xlg_config(struct mvpp2_port *port, unsigned int mode,
ctrl4 |= MVPP22_XLG_CTRL4_FWD_FC | MVPP22_XLG_CTRL4_FWD_PFC |
MVPP22_XLG_CTRL4_EN_IDLE_CHECK;
if (old_ctrl0 != ctrl0)
writel(ctrl0, port->base + MVPP22_XLG_CTRL0_REG);
if (old_ctrl4 != ctrl4)
writel(ctrl4, port->base + MVPP22_XLG_CTRL4_REG);
}