net: mvpp2: do not disable GMAC padding

commit e749aca8 upstream.

Short fragmented packets may never be sent by the hardware when padding
is disabled. This patch stop modifying the GMAC padding bits, to leave
them to their reset value (disabled).

Fixes: 3919357f ("net: mvpp2: initialize the GMAC when using a port")
Signed-off-by: Yan Markman <ymarkman@marvell.com>
[Antoine: commit message]
Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/ethernet/marvell/mvpp2.c

@@ -4552,11 +4552,6 @@ static void mvpp2_port_mii_gmac_configure_mode(struct mvpp2_port *port)
 		       MVPP22_CTRL4_QSGMII_BYPASS_ACTIVE;
 		val &= ~MVPP22_CTRL4_EXT_PIN_GMII_SEL;
 		writel(val, port->base + MVPP22_GMAC_CTRL_4_REG);
-
-		val = readl(port->base + MVPP2_GMAC_CTRL_2_REG);
-		val |= MVPP2_GMAC_DISABLE_PADDING;
-		val &= ~MVPP2_GMAC_FLOW_CTRL_MASK;
-		writel(val, port->base + MVPP2_GMAC_CTRL_2_REG);
 	} else if (phy_interface_mode_is_rgmii(port->phy_interface)) {
 		val = readl(port->base + MVPP22_GMAC_CTRL_4_REG);
 		val |= MVPP22_CTRL4_EXT_PIN_GMII_SEL |
@@ -4564,10 +4559,6 @@ static void mvpp2_port_mii_gmac_configure_mode(struct mvpp2_port *port)
 		       MVPP22_CTRL4_QSGMII_BYPASS_ACTIVE;
 		val &= ~MVPP22_CTRL4_DP_CLK_SEL;
 		writel(val, port->base + MVPP22_GMAC_CTRL_4_REG);
-
-		val = readl(port->base + MVPP2_GMAC_CTRL_2_REG);
-		val &= ~MVPP2_GMAC_DISABLE_PADDING;
-		writel(val, port->base + MVPP2_GMAC_CTRL_2_REG);
 	}
 
 	/* The port is connected to a copper PHY */