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Date: Mon, 26 Oct 2020 18:57:00 +0000
From: Radhey Shyam Pandey <radheys@...inx.com>
To: Robert Hancock <robert.hancock@...ian.com>,
"davem@...emloft.net" <davem@...emloft.net>,
"kuba@...nel.org" <kuba@...nel.org>
CC: Michal Simek <michals@...inx.com>,
"linux@...linux.org.uk" <linux@...linux.org.uk>,
"andrew@...n.ch" <andrew@...n.ch>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH net-next v2] net: axienet: Properly handle PCS/PMA PHY for
1000BaseX mode
Thanks for the patch.
> -----Original Message-----
> From: Robert Hancock <robert.hancock@...ian.com>
> Sent: Monday, October 26, 2020 11:26 PM
> To: Radhey Shyam Pandey <radheys@...inx.com>; davem@...emloft.net;
> kuba@...nel.org
> Cc: Michal Simek <michals@...inx.com>; linux@...linux.org.uk;
> andrew@...n.ch; netdev@...r.kernel.org; Robert Hancock
> <robert.hancock@...ian.com>
> Subject: [PATCH net-next v2] net: axienet: Properly handle PCS/PMA PHY for
> 1000BaseX mode
>
> Update the axienet driver to properly support the Xilinx PCS/PMA PHY
> component which is used for 1000BaseX and SGMII modes, including
> properly configuring the auto-negotiation mode of the PHY and reading
> the negotiated state from the PHY.
>
> Signed-off-by: Robert Hancock <robert.hancock@...ian.com>
> ---
>
> Resubmit of v2 tagged for net-next.
>
> drivers/net/ethernet/xilinx/xilinx_axienet.h | 3 +
> .../net/ethernet/xilinx/xilinx_axienet_main.c | 96 ++++++++++++++-----
> 2 files changed, 73 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet.h
> b/drivers/net/ethernet/xilinx/xilinx_axienet.h
> index f34c7903ff52..7326ad4d5e1c 100644
> --- a/drivers/net/ethernet/xilinx/xilinx_axienet.h
> +++ b/drivers/net/ethernet/xilinx/xilinx_axienet.h
> @@ -419,6 +419,9 @@ struct axienet_local {
> struct phylink *phylink;
> struct phylink_config phylink_config;
>
> + /* Reference to PCS/PMA PHY if used */
> + struct mdio_device *pcs_phy;
> +
> /* Clock for AXI bus */
> struct clk *clk;
>
> diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> index 9aafd3ecdaa4..f46595ef2822 100644
> --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
> @@ -1517,10 +1517,29 @@ static void axienet_validate(struct
> phylink_config *config,
>
> phylink_set(mask, Asym_Pause);
> phylink_set(mask, Pause);
> - phylink_set(mask, 1000baseX_Full);
> - phylink_set(mask, 10baseT_Full);
> - phylink_set(mask, 100baseT_Full);
> - phylink_set(mask, 1000baseT_Full);
> +
> + switch (state->interface) {
> + case PHY_INTERFACE_MODE_NA:
> + case PHY_INTERFACE_MODE_1000BASEX:
> + case PHY_INTERFACE_MODE_SGMII:
> + case PHY_INTERFACE_MODE_GMII:
> + case PHY_INTERFACE_MODE_RGMII:
> + case PHY_INTERFACE_MODE_RGMII_ID:
> + case PHY_INTERFACE_MODE_RGMII_RXID:
> + case PHY_INTERFACE_MODE_RGMII_TXID:
> + phylink_set(mask, 1000baseX_Full);
> + phylink_set(mask, 1000baseT_Full);
> + if (state->interface == PHY_INTERFACE_MODE_1000BASEX)
> + break;
100BaseT and 10BaseT can be set in PHY_INTERFACE_MODE_MII if we
allow fallthrough here.
> + phylink_set(mask, 100baseT_Full);
> + phylink_set(mask, 10baseT_Full);
> + break;
> + case PHY_INTERFACE_MODE_MII:
> + phylink_set(mask, 100baseT_Full);
> + phylink_set(mask, 10baseT_Full);
> + default:
> + break;
> + }
>
> bitmap_and(supported, supported, mask,
> __ETHTOOL_LINK_MODE_MASK_NBITS);
> @@ -1533,38 +1552,46 @@ static void axienet_mac_pcs_get_state(struct
> phylink_config *config,
> {
> struct net_device *ndev = to_net_dev(config->dev);
> struct axienet_local *lp = netdev_priv(ndev);
> - u32 emmc_reg, fcc_reg;
> -
> - state->interface = lp->phy_mode;
>
> - emmc_reg = axienet_ior(lp, XAE_EMMC_OFFSET);
> - if (emmc_reg & XAE_EMMC_LINKSPD_1000)
> - state->speed = SPEED_1000;
> - else if (emmc_reg & XAE_EMMC_LINKSPD_100)
> - state->speed = SPEED_100;
> - else
> - state->speed = SPEED_10;
> -
> - state->pause = 0;
> - fcc_reg = axienet_ior(lp, XAE_FCC_OFFSET);
> - if (fcc_reg & XAE_FCC_FCTX_MASK)
> - state->pause |= MLO_PAUSE_TX;
> - if (fcc_reg & XAE_FCC_FCRX_MASK)
> - state->pause |= MLO_PAUSE_RX;
> -
> - state->an_complete = 0;
> - state->duplex = 1;
> + switch (state->interface) {
> + case PHY_INTERFACE_MODE_SGMII:
> + case PHY_INTERFACE_MODE_1000BASEX:
> + phylink_mii_c22_pcs_get_state(lp->pcs_phy, state);
> + break;
> + default:
> + break;
> + }
> }
>
> static void axienet_mac_an_restart(struct phylink_config *config)
> {
> - /* Unsupported, do nothing */
> + struct net_device *ndev = to_net_dev(config->dev);
> + struct axienet_local *lp = netdev_priv(ndev);
> +
> + phylink_mii_c22_pcs_an_restart(lp->pcs_phy);
Is this phylink.._an_restart only called for 1000BaseX/SGMII?
> }
>
> static void axienet_mac_config(struct phylink_config *config, unsigned int
> mode,
> const struct phylink_link_state *state)
> {
> - /* nothing meaningful to do */
> + struct net_device *ndev = to_net_dev(config->dev);
> + struct axienet_local *lp = netdev_priv(ndev);
> + int ret;
> +
> + switch (state->interface) {
> + case PHY_INTERFACE_MODE_SGMII:
> + case PHY_INTERFACE_MODE_1000BASEX:
> + ret = phylink_mii_c22_pcs_config(lp->pcs_phy, mode,
> + state->interface,
> + state->advertising);
> + if (ret < 0)
> + netdev_warn(ndev, "Failed to configure PCS: %d\n",
> + ret);
> + break;
> +
> + default:
> + break;
> + }
> }
>
> static void axienet_mac_link_down(struct phylink_config *config,
> @@ -1999,6 +2026,20 @@ static int axienet_probe(struct platform_device
> *pdev)
> dev_warn(&pdev->dev,
> "error registering MDIO bus: %d\n", ret);
> }
Minor nit - There is already a check for phy_node at L1882. Maybe we
can refactor and use it.
if (!lp->phy_node) {
if (lp->phy_mode == PHY_INTERFACE_MODE_SGMII || BASEX)
//error handing
} else {
//existing code
}
> + if (lp->phy_mode == PHY_INTERFACE_MODE_SGMII ||
> + lp->phy_mode == PHY_INTERFACE_MODE_1000BASEX) {
> + if (!lp->phy_node) {
> + dev_err(&pdev->dev, "phy-handle required for
> 1000BaseX/SGMII\n");
> + ret = -EINVAL;
> + goto free_netdev;
> + }
> + lp->pcs_phy = of_mdio_find_device(lp->phy_node);
> + if (!lp->pcs_phy) {
> + ret = -EPROBE_DEFER;
Are we assuming the error is always EPROBE_DEFER?
> + goto free_netdev;
> + }
> + lp->phylink_config.pcs_poll = true;
> + }
>
> lp->phylink_config.dev = &ndev->dev;
> lp->phylink_config.type = PHYLINK_NETDEV;
> @@ -2036,6 +2077,9 @@ static int axienet_remove(struct platform_device
> *pdev)
> if (lp->phylink)
> phylink_destroy(lp->phylink);
>
> + if (lp->pcs_phy)
> + put_device(&lp->pcs_phy->dev);
> +
> axienet_mdio_teardown(lp);
>
> clk_disable_unprepare(lp->clk);
> --
> 2.18.4
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