stm32mp157d开发板网卡在1Gbps与100Mbps之间跳变问题，导致Link下线问题

jay2599

详细的错误信息如下所示：
# [ 7078.249008] stm32-dwmac 5800a000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 7079.287034] stm32-dwmac 5800a000.ethernet eth0: Link is Down
[ 7081.368959] stm32-dwmac 5800a000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 7084.487021] stm32-dwmac 5800a000.ethernet eth0: Link is Down
[ 7087.608936] stm32-dwmac 5800a000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 7088.647025] stm32-dwmac 5800a000.ethernet eth0: Link is Down
[ 7091.768940] stm32-dwmac 5800a000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 7094.887028] stm32-dwmac 5800a000.ethernet eth0: Link is Down
[ 7098.008876] stm32-dwmac 5800a000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 7099.047027] stm32-dwmac 5800a000.ethernet eth0: Link is Down
[ 7105.288929] stm32-dwmac 5800a000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 7106.327024] stm32-dwmac 5800a000.ethernet eth0: Link is Down
[ 7112.568950] stm32-dwmac 5800a000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 7113.607016] stm32-dwmac 5800a000.ethernet eth0: Link is Down
[ 7115.688467] stm32-dwmac 5800a000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx