Re: [PATCH net v3] net: dpaa: fix mode setting

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

On 7/17/26 09:20, Michael Walle wrote:
> Before converting to the phylink interface, the init function would have
> set a non-reserved I/F mode in the maccfg2 register. After converting to
> phylink, 0 is written as mode, which is a reserved value (although it's
> the hardware default). Without a valid mode, a SGMII link is never
> established between the MAC and the PHY and thus .link_up() is never
> called which could set the correct mode according to the actual speed.
> 
> Fix it by setting the maximum speed of the phy_interface_t in use in
> .mac_config() - just like the driver did before the phylink conversion.
> 
> Fixes: 5d93cfcf7360 ("net: dpaa: Convert to phylink")
> Suggested-by: Sean Anderson <sean.anderson@linux.dev>
> Signed-off-by: Michael Walle <mwalle@kernel.org>
> ---
> I didn't grab Sean's Rb tag as this is somewhat different.
> 
> Changes in v3:
>   - keep the mode setting also in .adjust_link().
>   - reword the commit message, to be (hopefully) more precise
>   - Link to v2: https://lore.kernel.org/r/20260710143430.2276141-1-mwalle@kernel.org/
> 
> 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    | 17 ++++++++++++-----
>   1 file changed, 12 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/freescale/fman/fman_dtsec.c b/drivers/net/ethernet/freescale/fman/fman_dtsec.c
> index fe35703c509e..b8d70c0ecb6c 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,

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

Christian, can you test this patch with ethernet at 100/1G speed if you still have
access to those P5020/P5040 boards?

https://lore.kernel.org/all/0bfc8f3d-cb62-25f4-2590-ff424adbe48a@xenosoft.de/