netdev - Re: [PATCH v2 net 3/5] amd-xgbe: enable PLL

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Date:   Wed, 19 Oct 2022 15:13:57 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Raju Rangoju <Raju.Rangoju@....com>, davem@...emloft.net,
        kuba@...nel.org, Shyam-sundar.S-k@....com
Cc:     netdev@...r.kernel.org, rajesh1.kumar@....com
Subject: Re: [PATCH v2 net 3/5] amd-xgbe: enable PLL_CTL for fixed PHY modes
 only

On 10/19/22 14:01, Tom Lendacky wrote:
> On 10/19/22 13:20, Raju Rangoju wrote:
>> PLL control setting(RRC) is needed only in fixed PHY configuration to
>> fix the peer-peer issues. Without the PLL control setting, the link up
>> takes longer time in a fixed phy configuration.
>>
>> Driver implements SW RRC for Autoneg On configuration, hence PLL control
>> setting (RRC) is not needed for AN On configuration, and can be skipped.
>>
>> Also, PLL re-initialization is not needed for PHY Power Off and RRCM
> 
> s/RRCM/RRC/
> 
>> commands. Otherwise, they lead to mailbox errors. Added the changes
>> accordingly.
>>
>> Fixes: daf182d360e5 ("net: amd-xgbe: Toggle PLL settings during rate 
>> change")
>> Signed-off-by: Raju Rangoju <Raju.Rangoju@....com>
>> ---
>> Changes since v1:
>> - used enums for all mailxbox command and subcommands, pre-patch to this
>> contains the enum updates
>> - updated the comment section to include RRC command
>> - updated the commit message to use RRC instead of RRCM
>>
>>   drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c | 10 ++++++++--
>>   1 file changed, 8 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c 
>> b/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
>> index 8cf5d81fca36..b9c65322248a 100644
>> --- a/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
>> +++ b/drivers/net/ethernet/amd/xgbe/xgbe-phy-v2.c
>> @@ -1979,6 +1979,10 @@ static void xgbe_phy_rx_reset(struct 
>> xgbe_prv_data *pdata)
>>   static void xgbe_phy_pll_ctrl(struct xgbe_prv_data *pdata, bool enable)
>>   {
>> +    /* PLL_CTRL feature needs to be enabled for fixed PHY modes 
>> (Non-Autoneg) only */
>> +    if (pdata->phy.autoneg != AUTONEG_DISABLE)
>> +        return;
>> +
>>       XMDIO_WRITE_BITS(pdata, MDIO_MMD_PMAPMD, MDIO_VEND2_PMA_MISC_CTRL0,
>>                XGBE_PMA_PLL_CTRL_MASK,
>>                enable ? XGBE_PMA_PLL_CTRL_ENABLE
>> @@ -2029,8 +2033,10 @@ static void xgbe_phy_perform_ratechange(struct 
>> xgbe_prv_data *pdata,
>>       xgbe_phy_rx_reset(pdata);
>>   reenable_pll:
>> -    /* Enable PLL re-initialization */
>> -    xgbe_phy_pll_ctrl(pdata, true);
>> +    /* Enable PLL re-initialization, not needed for PHY Power Off and 
>> RRC cmds */
>> +    if (cmd != XGBE_MAILBOX_CMD_POWER_OFF &&

Also, XGBE_MAILBOX_CMD_POWER_OFF isn't defined.

Thanks,
Tom

>> +        cmd != XGBE_MAILBOX_CMD_RRCM)
> 
> XGBE_MAILBOX_CMD_RRCM isn't defined, so this patch won't build.
> 
> Thanks,
> Tom
> 
>> +        xgbe_phy_pll_ctrl(pdata, true);
>>   }
>>   static void xgbe_phy_rrc(struct xgbe_prv_data *pdata)