linux-kernel - Re: [PATCH net-next v2 31/35] [RFT] net: dpaa: Convert to phylink

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Date:   Thu, 30 Jun 2022 11:56:27 -0400
From:   Sean Anderson <sean.anderson@...o.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Madalin Bucur <madalin.bucur@....com>, netdev@...r.kernel.org,
        Paolo Abeni <pabeni@...hat.com>,
        linux-arm-kernel@...ts.infradead.org,
        Eric Dumazet <edumazet@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 31/35] [RFT] net: dpaa: Convert to phylink

Hi Russell,

On 6/29/22 10:44 AM, Russell King (Oracle) wrote:
> On Tue, Jun 28, 2022 at 06:14:00PM -0400, Sean Anderson wrote:
>> +static void dtsec_mac_config(struct phylink_config *config, unsigned int mode,
>> +			     const struct phylink_link_state *state)
>> +{
>> +	struct mac_device *mac_dev = fman_config_to_mac(config);
>> +	struct dtsec_regs __iomem *regs = mac_dev->fman_mac->regs;
>> +	u32 tmp;
>> +
>> +	switch (state->interface) {
>> +	case PHY_INTERFACE_MODE_RMII:
>> +		tmp = DTSEC_ECNTRL_RMM;
>> +		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;
>> +		break;
>> +	case PHY_INTERFACE_MODE_SGMII:
>> +	case PHY_INTERFACE_MODE_1000BASEX:
>> +	case PHY_INTERFACE_MODE_2500BASEX:
>> +		tmp = DTSEC_ECNTRL_TBIM | DTSEC_ECNTRL_SGMIIM;
>> +		break;
>> +	default:
>> +		dev_warn(mac_dev->dev, "cannot configure dTSEC for %s\n",
>> +			 phy_modes(state->interface));
>> +	}
>> +
>> +	if (state->speed == SPEED_100)
>> +		tmp |= DTSEC_ECNTRL_R100M;
> 
> Please do not refer to state->speed here, it is meaningless. What are
> you trying to achieve here?

Well, it's part of ECNTRL, so I figured I might as well set it all at once.

> It looks like the old dtsec_adjust_link() used to set/clear this when
> the link comes up - so can it be moved to dtsec_link_up() ?

Sure.

---

I forgot to mention this in the commit description, but I touched on this
in our previous discussion: do you have a suggestion for the Aquantia stuff
in dpaa_phy_init? There's no direct access to the phy any more, so it's
harder to bodge it and say "we must enable flow control for this phy".

--Sean