sh_eth: fix SH7757 GEther initialization

Renesas SH7757 has 2 Fast and 2 Gigabit Ether controllers, while the 'sh_eth' driver can only reset and initialize TSU of the first controller pair. Shimoda-san tried to solve that adding the 'needs_init' member to the 'struct sh_eth_plat_data', however the platform code still never sets this flag. I think that we can infer this information from the 'devno' variable (set to 'platform_device::id') and reset/init the Ether controller pair only for an even 'devno'; therefore 'sh_eth_plat_data::needs_init' can be removed...

---
The patch is against DaveM's 'net.git' repo.

 drivers/net/ethernet/renesas/sh_eth.c |    4 ++--
 include/linux/sh_eth.h                |    1 -
 2 files changed, 2 insertions(+), 3 deletions(-)

Index: net/drivers/net/ethernet/renesas/sh_eth.c =================================--- net.orig/drivers/net/ethernet/renesas/sh_eth.c +++ net/drivers/net/ethernet/renesas/sh_eth.c
@@ -3254,8 +3254,8 @@ static int sh_eth_drv_probe(struct platf
ndev->features = NETIF_F_HW_VLAN_CTAG_FILTER;
}

- /* initialize first or needed device */
- if (!devno || pd->needs_init) {
+ /* Need to init only the first port of the two sharing a TSU */
+ if (devno % 2 = 0) {
if (mdp->cd->chip_reset)
mdp->cd->chip_reset(ndev);

Index: net/include/linux/sh_eth.h =================================--- net.orig/include/linux/sh_eth.h +++ net/include/linux/sh_eth.h
@@ -17,7 +17,6 @@ struct sh_eth_plat_data {
unsigned char mac_addr[ETH_ALEN];
unsigned no_ether_link:1;
unsigned ether_link_active_low:1;
- unsigned needs_init:1;
};

#endif

From: Sergei Shtylyov <[email protected]>
Date: Thu, 04 Jan 2018 21:06:49 +0300

Applied and queued up for -stable.