netdev - Re: [PATCH net 1/3] amd-xgbe: handle corner-case during sfp hotplug

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Date: Wed, 22 Nov 2023 11:31:18 +0100
From: Wojciech Drewek <wojciech.drewek@...el.com>
To: Raju Rangoju <Raju.Rangoju@....com>, <netdev@...r.kernel.org>
CC: <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <Thomas.Lendacky@....com>, <Shyam-sundar.S-k@....com>
Subject: Re: [PATCH net 1/3] amd-xgbe: handle corner-case during sfp hotplug



On 21.11.2023 20:14, Raju Rangoju wrote:
> Force the mode change for SFI in Fixed PHY configurations. Fixed PHY
> configurations needs PLL to be enabled while doing mode set. When the
> SFP module isn't connected during boot, driver assumes AN is ON and
> attempts auto-negotiation. However, if the connected SFP comes up in
> Fixed PHY configuration the link will not come up as PLL isn't enabled
> while the initial mode set command is issued. So, force the mode change
> for SFI in Fixed PHY configuration to fix link issues.
> 
> Fixes: e57f7a3feaef ("amd-xgbe: Prepare for working with more than one type of phy")
> Acked-by: Shyam Sundar S K <Shyam-sundar.S-k@....com>
> Signed-off-by: Raju Rangoju <Raju.Rangoju@....com>
> ---

Thanks for our patches!
Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com>

>  drivers/net/ethernet/amd/xgbe/xgbe-mdio.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c b/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
> index 32d2c6fac652..4a2dc705b528 100644
> --- a/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
> +++ b/drivers/net/ethernet/amd/xgbe/xgbe-mdio.c
> @@ -1193,7 +1193,19 @@ static int xgbe_phy_config_fixed(struct xgbe_prv_data *pdata)
>  	if (pdata->phy.duplex != DUPLEX_FULL)
>  		return -EINVAL;
>  
> -	xgbe_set_mode(pdata, mode);
> +	/* Force the mode change for SFI in Fixed PHY config.
> +	 * Fixed PHY configs needs PLL to be enabled while doing mode set.
> +	 * When the SFP module isn't connected during boot, driver assumes
> +	 * AN is ON and attempts autonegotiation. However, if the connected
> +	 * SFP comes up in Fixed PHY config, the link will not come up as
> +	 * PLL isn't enabled while the initial mode set command is issued.
> +	 * So, force the mode change for SFI in Fixed PHY configuration to
> +	 * fix link issues.
> +	 */
> +	if (mode == XGBE_MODE_SFI)
> +		xgbe_change_mode(pdata, mode);
> +	else
> +		xgbe_set_mode(pdata, mode);
>  
>  	return 0;
>  }