netdev - Re: [PATCH net-next] amd-xgbe: let the MAC manage PHY PM

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Message-ID: <7dbcbe6c-d0fe-4321-b4ca-34b7b322823a@amd.com>
Date: Fri, 21 Nov 2025 15:52:18 +0530
From: "Rangoju, Raju" <raju.rangoju@....com>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>, netdev@...r.kernel.org
Cc: pabeni@...hat.com, kuba@...nel.org, edumazet@...gle.com,
 davem@...emloft.net, andrew+netdev@...n.ch, Shyam-sundar.S-k@....com
Subject: Re: [PATCH net-next] amd-xgbe: let the MAC manage PHY PM



On 11/19/2025 9:27 PM, Maxime Chevallier wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
> 
> 
> Hi Raju,
> 
> On 19/11/2025 10:31, Raju Rangoju wrote:
>> Use the MAC managed PM flag to indicate that MAC driver takes care of
>> suspending/resuming the PHY, and reset it when the device is brought up.
>>
>> Signed-off-by: Raju Rangoju <Raju.Rangoju@....com>
>> ---
>>   drivers/net/ethernet/amd/xgbe/xgbe-drv.c    | 3 +++
>>   drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c | 1 +
>>   2 files changed, 4 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
>> index f3adf29b222b..1c03fb138ce6 100644
>> --- a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
>> +++ b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
>> @@ -1266,6 +1266,9 @@ static int xgbe_start(struct xgbe_prv_data *pdata)
>>
>>        clear_bit(XGBE_STOPPED, &pdata->dev_state);
>>
>> +     /* Reset the phy settings */
>> +     xgbe_phy_reset(pdata);
>> +
> 
> At a first glance, this looks like 2 different things, so maybe 2
> different patches ?
> 

Hi Maxime,

Patch is setting MAC managed PM flag and moving the reset to appropriate 
place. Do you see a need for separate patch for this?

> That said, with this change does it still make sense to call
> xgbe_phy_reset() in xgbe_open() ?

No, calling it in xgbe_open() isn't needed.

> 
> With this patch we have :
> 
> xgpe_open() {
> 
>    xgbe_phy_reset();
> 
>    xgbe_start() {
>      xgbe_phy_reset(); /* again */
>    }
> }
> 
> Can you remove the first call in .ndo_open ?

sure, I'll take of this in V2.

> 
> Maxime
>