Danish,
On 07/02/2023 17:29, Md Danish Anwar wrote:
> Hi Andrew,
>
> On 06/02/23 19:45, Andrew Lunn wrote:
>>> +enum mii_mode {
>>> + MII_MODE_MII = 0,
>>> + MII_MODE_RGMII,
>>> + MII_MODE_SGMII
>>
>> There is no mention of SGMII anywhere else. And in a couple of places,
>> the code makes the assumption that if it is not RGMII it is MII.
>>
>> Does the hardware really support SGMII?
>>
>
> As far as I know, the hardware does support SGMII but it's not yet supported by
> the driver. I will drop the SGMII because it's not needed as of now. If in
> future support for SGMII is there, I'll add it.
>
>>> +static int prueth_config_rgmiidelay(struct prueth *prueth,
>>> + struct device_node *eth_np,
>>> + phy_interface_t phy_if)
>>> +{
>>
>> ...
>>
>>> + if (phy_if == PHY_INTERFACE_MODE_RGMII_ID ||
>>> + phy_if == PHY_INTERFACE_MODE_RGMII_TXID)
>>> + rgmii_tx_id |= ICSSG_CTRL_RGMII_ID_MODE;
>>> +
>>> + regmap_update_bits(ctrl_mmr, icssgctrl_reg, ICSSG_CTRL_RGMII_ID_MODE, rgmii_tx_id);
This is only applicable to some devices so you need to restrict this only
to those devices.
And only when you enable MAC TX delay you need to change emac->phy_if to PHY_INTERFACE_MODE_RGMII_RXID
if it was PHY_INTERFACE_MODE_RGMII_ID.
>>
>> Here you are adding the TX delay if the phy-mode indicates it should
>> be added.
>>
>>> +static int prueth_netdev_init(struct prueth *prueth,
>>> + struct device_node *eth_node)
>>> +{
>>
>>> + ret = of_get_phy_mode(eth_node, &emac->phy_if);
>>> + if (ret) {
>>> + dev_err(prueth->dev, "could not get phy-mode property\n");
>>> + goto free;
>>> + }
>>
>>> + ret = prueth_config_rgmiidelay(prueth, eth_node, emac->phy_if);
>>> + if (ret)
>>> + goto free;
>>> +
>>
>> Reading it from DT and calling the delay function.
>>
>>> +static int prueth_probe(struct platform_device *pdev)
>>> +{
>>
>>
>>> + /* register the network devices */
>>> + if (eth0_node) {
>>> + ret = register_netdev(prueth->emac[PRUETH_MAC0]->ndev);
>>> + if (ret) {
>>> + dev_err(dev, "can't register netdev for port MII0");
>>> + goto netdev_exit;
>>> + }
>>> +
>>> + prueth->registered_netdevs[PRUETH_MAC0] = prueth->emac[PRUETH_MAC0]->ndev;
>>> +
>>> + emac_phy_connect(prueth->emac[PRUETH_MAC0]);
>>
>> And this is connecting the MAC and the PHY, where emac_phy_connect()
>> passes emac->phy_if to phylib.
>>
>> What i don't see anywhere is you changing emac->phy_if to indicate the
>> MAC has inserted the TX delay, and so the PHY should not.
>>
>
> Yes, there is no indication whether MAC has enabled TX delay or not. I have
> changed the phy-mode in DT from "rgmii-rxid" to "rgmii-id" as per your
> suggestion in previous revision. I will keep Tx Internal delay as it is(getting
> configured in MAC) and inside emac_phy_connect() API, while calling
> of_phy_connect() instead of passing emac->phy_if (which is rgmii-id as per DT),
> I will pass PHY_INTERFACE_MODE_RGMII_RXID. This will make sure that phy only
> enables Rx delay and keep the existing approach of keepping Tx delay in MAC.
>
> Currently, in emac_phy_connect() API,
>
> /* connect PHY */
> ndev->phydev = of_phy_connect(emac->ndev, emac->phy_node,
> &emac_adjust_link, 0,
> emac->phy_if);
> I will change it to,
>
> /* connect PHY */
> ndev->phydev = of_phy_connect(emac->ndev, emac->phy_node,
> &emac_adjust_link, 0,
> PHY_INTERFACE_MODE_RGMII_RXID);
>
> Let me know if this looks OK.
No, this is not OK.
Please keep this as emac->phy_if.
In prueth_config_rgmiidelay(), you can change emac->phy_if to
PHY_INTERFACE_MODE_RGMII_RXID only if it was RGMII mode
*and* MAC TX delay was enabled.
cheers,
-roger
