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The Linux kernel PHY driver sets AN_RESTART in the BMCR of the PHY when autonegotiation is started. Recently the kernel started to read back the PHY's AN_RESTART bit and now checks whether the autonegotiation is complete and the bit was cleared [1]. Otherwise the link status is down. The emulated PHY needs to clear AN_RESTART immediately to inform the kernel driver about the completion of autonegotiation phase. [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c36757eb9dee Signed-off-by: Linus Ziegert <linus.ziegert+qemu@holoplot.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20191104181604.21943-1-linus.ziegert+qemu@holoplot.com Cc: qemu-stable@nongnu.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>