The sh_eth_close() resets the MAC and then calls phy_stop()
so that mdio read access result is incorrect without any error
according to kernel trace like below:
ifconfig-216 [003] .n.. 109.133124: mdio_access: ee700000.ethernet-ffffffff
read phy:0x01 reg:0x00 val:0xffff
To fix the issue, this patch adds a condition and set the RMII mode
regiseter in sh_eth_dev_exit() for some SoCs.
Note that when I have tried to move the sh_eth_dev_exit() calling
after phy_stop() on sh_eth_close(), but it gets worse.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda...@renesas.com>
---
drivers/net/ethernet/renesas/sh_eth.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/net/ethernet/renesas/sh_eth.c
b/drivers/net/ethernet/renesas/sh_eth.c
index e33af37..106ae90 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -1596,6 +1596,10 @@ static void sh_eth_dev_exit(struct net_device *ndev)
/* Set MAC address again */
update_mac_address(ndev);
+
+ /* Set the mode again if required */
+ if (mdp->cd->rmiimode)
+ sh_eth_write(ndev, 0x1, RMIIMODE);
}
static void sh_eth_rx_csum(struct sk_buff *skb)
--
2.7.4
