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>
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 1853f7f..1763e48 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/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);