NET: dwmac: Make dwmac reset unconditional

Unconditional reset dwmac before HW init if reset controller is present.

In existing implementation we reset dwmac only after second module
probing:
(module load -> unload -> load again [reset happens])

Now we reset dwmac at every module load:
(module load [reset happens] -> unload -> load again [reset happens])

Also some reset controllers have only reset callback instead of
assert + deassert callbacks pair, so handle this case.
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -4120,8 +4120,15 @@ int stmmac_dvr_probe(struct device *device,
 	if ((phyaddr >= 0) && (phyaddr <= 31))
 		priv->plat->phy_addr = phyaddr;
 
-	if (priv->plat->stmmac_rst)
+	if (priv->plat->stmmac_rst) {
+		ret = reset_control_assert(priv->plat->stmmac_rst);
 		reset_control_deassert(priv->plat->stmmac_rst);
+		/* Some reset controllers have only reset callback instead of
+		 * assert + deassert callbacks pair.
+		 */
+		if (ret == -ENOTSUPP)
+			reset_control_reset(priv->plat->stmmac_rst);
+	}
 
 	/* Init MAC and get the capabilities */
 	ret = stmmac_hw_init(priv);