[Intel-wired-lan] [PATCH v1 3/3] e1000e: Additional PHY power saving in s0ix

[Sasha Neftin]

On 7/13/2021 10:12, Paul Menzel wrote:
> Dear Sasha, dear Dima,
>
>
> Am 24.06.21 um 10:19 schrieb Sasha Neftin:
>
> Could you please use a statement in the commit message summary? Maybe:
>
>> Disable additional PHY features(?) in S0ix
>
>> After transferring the MAC-PHY interface to the SMBus the PHY
>> will save power in S0ix low power idle mode.
>
> I do not understand this. Please rewrite, and mention the three PHY 
> features(?) you change.
>
> Please document how you tested this, and exactly how much power is saved.

Dear Paul,

The PHY will save 47-85mW in s0ix. It is tested (by our electrical 
validation team) on a sense resistor on a specific external board over 
the TGL platform.

This measurement could variate from platform to platform and depends on 
the specific platform design.

>
>> Suggested-by: Dima Ruinskiy <dima.ruinskiy at intel.com>
>> Signed-off-by: Sasha Neftin <sasha.neftin at intel.com>
>> ---
>>   drivers/net/ethernet/intel/e1000e/netdev.c | 6 ++++++
>>   1 file changed, 6 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c 
>> b/drivers/net/ethernet/intel/e1000e/netdev.c
>> index 6e6e2e685e9d..c4f3e5ca7294 100644
>> --- a/drivers/net/ethernet/intel/e1000e/netdev.c
>> +++ b/drivers/net/ethernet/intel/e1000e/netdev.c
>> @@ -6380,10 +6380,16 @@ static void e1000e_s0ix_entry_flow(struct 
>> e1000_adapter *adapter)
>>           ew32(CTRL_EXT, mac_data);
>>             /* DFT control: PHY bit: page769_20[0] = 1
>> +         * page769_20[7] - PHY PLL stop
>> +         * page769_20[8] - PHY go to the electrical idle
>> +         * page769_20[9] - PHY serdes disable
>>            * Gate PPW via EXTCNF_CTRL - set 0x0F00[7] = 1
>>            */
>>           e1e_rphy(hw, I82579_DFT_CTRL, &phy_data);
>>           phy_data |= BIT(0);
>> +        phy_data |= BIT(7);
>> +        phy_data |= BIT(8);
>> +        phy_data |= BIT(9);
>>           e1e_wphy(hw, I82579_DFT_CTRL, phy_data);
>>             mac_data = er32(EXTCNF_CTRL);
>>
>
>
> Kind regards,
>
> Paul

Thanks,

Sasha

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