Re: [PATCH net v2] net: dpaa: fix mode setting

[Sean Anderson <sean.anderson@linux.dev>]

On 7/10/26 10:22, Michael Walle wrote:
> Before converting to the phylink interface, the init function would have
> set the correct I/F mode depending on the maximum link speed of an
> interface. After converting to phylink, the established link speed
> is used to determine this setting and is set in the .link_up()
> callback. The callback isn't called because the link is never
> established between the PCS and a connected SGMII PHY.
> To fix it, don't use the current speed, but set the mode depending on
> the interface (which implies the maximum speed) in .mac_config().
> 
> Fixes: 5d93cfcf7360 ("net: dpaa: Convert to phylink")
> Suggested-by: Sean Anderson <sean.anderson@linux.dev>
> Signed-off-by: Michael Walle <mwalle@kernel.org>
> ---
> FWIW, I dropped setting a non-reserved mode in init(). The hardware
> default is 0 and the mac_config() will set a valid mode anyway.
> 
> Changes in v2:
>   - the setting is/was based on the maximum speed, not the current
>     speed. thus, move the setting into mac_config().
>   - Link to v1: https://lore.kernel.org/r/20260706121011.1948906-1-mwalle@kernel.org/
> 
>   .../net/ethernet/freescale/fman/fman_dtsec.c  | 26 ++++++++++---------
>   1 file changed, 14 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/net/ethernet/freescale/fman/fman_dtsec.c b/drivers/net/ethernet/freescale/fman/fman_dtsec.c
> index fe35703c509e..7075f93bab49 100644
> --- a/drivers/net/ethernet/freescale/fman/fman_dtsec.c
> +++ b/drivers/net/ethernet/freescale/fman/fman_dtsec.c
> @@ -900,22 +900,28 @@ static void dtsec_mac_config(struct phylink_config *config, unsigned int mode,
>   {
>   	struct mac_device *mac_dev = fman_config_to_mac(config);
>   	struct dtsec_regs __iomem *regs = mac_dev->fman_mac->regs;
> -	u32 tmp;
> +	u32 ecntrl, maccfg2;
> +
> +	maccfg2 = ioread32be(&regs->maccfg2);
> +	maccfg2 &= ~(MACCFG2_NIBBLE_MODE | MACCFG2_BYTE_MODE);
>   
>   	switch (state->interface) {
>   	case PHY_INTERFACE_MODE_RMII:
> -		tmp = DTSEC_ECNTRL_RMM;
> +		ecntrl = DTSEC_ECNTRL_RMM;
> +		maccfg2 |= MACCFG2_NIBBLE_MODE;
>   		break;
>   	case PHY_INTERFACE_MODE_RGMII:
>   	case PHY_INTERFACE_MODE_RGMII_ID:
>   	case PHY_INTERFACE_MODE_RGMII_RXID:
>   	case PHY_INTERFACE_MODE_RGMII_TXID:
> -		tmp = DTSEC_ECNTRL_GMIIM | DTSEC_ECNTRL_RPM;
> +		ecntrl = DTSEC_ECNTRL_GMIIM | DTSEC_ECNTRL_RPM;
> +		maccfg2 |= MACCFG2_BYTE_MODE;
>   		break;
>   	case PHY_INTERFACE_MODE_SGMII:
>   	case PHY_INTERFACE_MODE_1000BASEX:
>   	case PHY_INTERFACE_MODE_2500BASEX:
> -		tmp = DTSEC_ECNTRL_TBIM | DTSEC_ECNTRL_SGMIIM;
> +		ecntrl = DTSEC_ECNTRL_TBIM | DTSEC_ECNTRL_SGMIIM;
> +		maccfg2 |= MACCFG2_BYTE_MODE;
>   		break;
>   	default:
>   		dev_warn(mac_dev->dev, "cannot configure dTSEC for %s\n",
> @@ -923,7 +929,8 @@ static void dtsec_mac_config(struct phylink_config *config, unsigned int mode,
>   		return;
>   	}
>   
> -	iowrite32be(tmp, &regs->ecntrl);
> +	iowrite32be(ecntrl, &regs->ecntrl);
> +	iowrite32be(maccfg2, &regs->maccfg2);
>   }
>   
>   static void dtsec_link_up(struct phylink_config *config, struct phy_device *phy,
> @@ -948,15 +955,10 @@ static void dtsec_link_up(struct phylink_config *config, struct phy_device *phy,
>   	iowrite32be(tmp, &regs->ecntrl);
>   
>   	tmp = ioread32be(&regs->maccfg2);
> -	tmp &= ~(MACCFG2_NIBBLE_MODE | MACCFG2_BYTE_MODE | MACCFG2_FULL_DUPLEX);
> -	if (speed >= SPEED_1000)
> -		tmp |= MACCFG2_BYTE_MODE;
> -	else
> -		tmp |= MACCFG2_NIBBLE_MODE;
> -
>   	if (duplex == DUPLEX_FULL)
>   		tmp |= MACCFG2_FULL_DUPLEX;
> -
> +	else
> +		tmp &= ~MACCFG2_FULL_DUPLEX;

Did you test this when forcing 10/100 speed?

>   	iowrite32be(tmp, &regs->maccfg2);
>   
>   	mac_dev->update_speed(mac_dev, speed);

If so,

Reviewed-by: Sean Anderson <sean.anderson@linux.dev>