From: Yoshihiro Shimoda <[email protected]> Date: Tue, 28 May 2019 13:10:46 +0900
> 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 > > According to the hardware manual, the RMII mode should be set to 1 > before operation the Ethernet MAC. However, the previous code was not > set to 1 after the driver issued the soft_reset in sh_eth_dev_exit() > so that the mdio read access result seemed incorrect. To fix the issue, > this patch adds a condition and set the RMII mode register in > sh_eth_dev_exit() for R-Car Gen2 and RZ/A1 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 (kernel panic > happened and it seems that a register is accessed while the clock is > off). > > Signed-off-by: Yoshihiro Shimoda <[email protected]> > --- > Changes from v1 (https://patchwork.kernel.org/patch/10944265/): > - Revise the subject, commit log and the comment of the code. > - Move the RMII setting to right after soft_reset. Applied, thank you.
