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Issue: Ethernet mplan stability tests at -20C for 10Mbps fails with rate 15% Basically the GPHY 10M power saving includes the below parameters, clock speed down, pll off and reference voltage off. During debugging it was found that enable/disable pll circuit frequently when in 10M low data traffic (such as idle mode) may have a corner case and plays a part in this issue repro. Fix: So plloff saving function should be disable (do not have to open it) for nvidia -20C mplan test case. Bug 3946623 Change-Id: I87ab9b487fe5924ee9ee16bbb14d7f8c19f3a4e7 Signed-off-by: Sushil Kumar Singh <sushilkumars@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2939046 Tested-by: Revanth Kumar Uppala <ruppala@nvidia.com> Reviewed-by: Revanth Kumar Uppala <ruppala@nvidia.com> Reviewed-by: Bitan Biswas <bbiswas@nvidia.com> GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com> Signed-off-by: Revanth Kumar Uppala <ruppala@nvidia.com> (cherry picked from commit 80f6470d40821bfbad8f8166d22442e949b47173) Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2942039 Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>