net: stmmac: dwmac4: Enable RX Jumbo frame support

We are already doing it by default in the TX path so we can also enable
Jumbo Frame support in the RX path independently of MTU value.
Signed-off-by: NJose Abreu <joabreu@synopsys.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/dwmac4.h

@@ -352,7 +352,8 @@ enum power_event {
 
 /* Default operating mode of the MAC */
 #define GMAC_CORE_INIT (GMAC_CONFIG_JD | GMAC_CONFIG_PS | \
-			GMAC_CONFIG_BE | GMAC_CONFIG_DCRS)
+			GMAC_CONFIG_BE | GMAC_CONFIG_DCRS | \
+			GMAC_CONFIG_JE)
 
 /* To dump the core regs excluding  the Address Registers */
 #define	GMAC_REG_NUM	132

drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c

@@ -25,15 +25,9 @@ static void dwmac4_core_init(struct mac_device_info *hw,
 {
 	void __iomem *ioaddr = hw->pcsr;
 	u32 value = readl(ioaddr + GMAC_CONFIG);
-	int mtu = dev->mtu;
 
 	value |= GMAC_CORE_INIT;
 
-	if (mtu > 1500)
-		value |= GMAC_CONFIG_2K;
-	if (mtu > 2000)
-		value |= GMAC_CONFIG_JE;
-
 	if (hw->ps) {
 		value |= GMAC_CONFIG_TE;