On 4/13/2024 12:27 PM, Hui Wang wrote:
The commit 861e8086029e ("e1000e: move force SMBUS from enable ulp
function to avoid PHY loss issue") introduces a regression on
CH_MTP_I219_LM18 (PCIID: 0x8086550A). Without this commit, the
ethernet works well after suspend and resume, but after applying the
commit, the ethernet couldn't work anymore after the resume and the
dmesg shows that the NIC Link changes to 10Mbps (1000Mbps originally):
[ 43.305084] e1000e 0000:00:1f.6 enp0s31f6: NIC Link is Up 10 Mbps Full
Duplex, Flow Control: Rx/Tx
Without the commit, the force SMBUS code will not be executed if
"return 0" or "goto out" is executed in the enable_ulp(), and in my
case, the "goto out" is executed since FWSM_FW_VALID is set. But after
applying the commit, the force SMBUS code will be ran unconditionally.
Here move the force SMBUS code back to enable_ulp() and put it
immediate ahead of hw->phy.ops.release(hw), this could allow the
longest settling time as possible for interface in this function and
doesn't change the original code logic.
Fixes: 861e8086029e ("e1000e: move force SMBUS from enable ulp function to avoid PHY
loss issue")
Signed-off-by: Hui Wang <[email protected]>
After discussing this patch offline with Hui this solution is the
safest, therefore, I suggest to accept it.
Acked-by: Vitaly Lifshits <[email protected]>
