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Date: Tue, 30 May 2023 11:01:47 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: Andrew Lunn <andrew@...n.ch>, netdev <netdev@...r.kernel.org>
Cc: Heiner Kallweit <hkallweit1@...il.com>,
Russell King <rmk+kernel@...linux.org.uk>,
Oleksij Rempel <linux@...pel-privat.de>
Subject: Re: [RFC/RFTv3 13/24] net: genet: Fixup EEE
On 3/30/23 17:55, Andrew Lunn wrote:
> The enabling/disabling of EEE in the MAC should happen as a result of
> auto negotiation. So move the enable/disable into bcmgenet_mii_setup()
> which gets called by phylib when there is a change in link status.
>
> bcmgenet_set_eee() now just writes the LTI timer value to the
> hardware. Everything else is passed to phylib, so it can correctly
> setup the PHY.
>
> bcmgenet_get_eee() relies on phylib doing most of the work, the MAC
> driver just adds the LTI timer value from hardware.
>
> The call to bcmgenet_eee_enable_set() in the resume function has been
> removed. There is both unconditional calls to phy_init_hw() and
> genphy_config_aneg, and a call to phy_resume(). As a result, the PHY
> is going to perform auto-neg, and then it completes
> bcmgenet_mii_setup() will be called, which will set the hardware to
> the correct EEE mode.
>
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> ---
> .../net/ethernet/broadcom/genet/bcmgenet.c | 42 +++++--------------
> .../net/ethernet/broadcom/genet/bcmgenet.h | 3 +-
> drivers/net/ethernet/broadcom/genet/bcmmii.c | 1 +
> 3 files changed, 12 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> index d937daa8ee88..035486304e31 100644
> --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> @@ -1272,19 +1272,21 @@ static void bcmgenet_get_ethtool_stats(struct net_device *dev,
> }
> }
>
> -static void bcmgenet_eee_enable_set(struct net_device *dev, bool enable)
> +void bcmgenet_eee_enable_set(struct net_device *dev, bool eee_active)
Replacing the argument name here is a bit of noise in reviewing the
patch, and it does not fundamentally change the behavior or semantics IMHO.
> {
> struct bcmgenet_priv *priv = netdev_priv(dev);
> - u32 off = priv->hw_params->tbuf_offset + TBUF_ENERGY_CTRL;
> + u32 off;
> u32 reg;
>
> - if (enable && !priv->clk_eee_enabled) {
> + off = priv->hw_params->tbuf_offset + TBUF_ENERGY_CTRL;
> +
> + if (eee_active && !priv->clk_eee_enabled) {
> clk_prepare_enable(priv->clk_eee);
> priv->clk_eee_enabled = true;
> }
>
> reg = bcmgenet_umac_readl(priv, UMAC_EEE_CTRL);
> - if (enable)
> + if (eee_active)
> reg |= EEE_EN;
> else
> reg &= ~EEE_EN;
> @@ -1292,7 +1294,7 @@ static void bcmgenet_eee_enable_set(struct net_device *dev, bool enable)
>
> /* Enable EEE and switch to a 27Mhz clock automatically */
> reg = bcmgenet_readl(priv->base + off);
> - if (enable)
> + if (eee_active)
> reg |= TBUF_EEE_EN | TBUF_PM_EN;
> else
> reg &= ~(TBUF_EEE_EN | TBUF_PM_EN);
> @@ -1300,25 +1302,21 @@ static void bcmgenet_eee_enable_set(struct net_device *dev, bool enable)
>
> /* Do the same for thing for RBUF */
> reg = bcmgenet_rbuf_readl(priv, RBUF_ENERGY_CTRL);
> - if (enable)
> + if (eee_active)
> reg |= RBUF_EEE_EN | RBUF_PM_EN;
> else
> reg &= ~(RBUF_EEE_EN | RBUF_PM_EN);
> bcmgenet_rbuf_writel(priv, reg, RBUF_ENERGY_CTRL);
>
> - if (!enable && priv->clk_eee_enabled) {
> + if (!eee_active && priv->clk_eee_enabled) {
> clk_disable_unprepare(priv->clk_eee);
> priv->clk_eee_enabled = false;
> }
> -
> - priv->eee.eee_enabled = enable;
> - priv->eee.eee_active = enable;
> }
>
> static int bcmgenet_get_eee(struct net_device *dev, struct ethtool_eee *e)
> {
> struct bcmgenet_priv *priv = netdev_priv(dev);
> - struct ethtool_eee *p = &priv->eee;
>
> if (GENET_IS_V1(priv))
> return -EOPNOTSUPP;
> @@ -1326,8 +1324,6 @@ static int bcmgenet_get_eee(struct net_device *dev, struct ethtool_eee *e)
> if (!dev->phydev)
> return -ENODEV;
>
> - e->eee_enabled = p->eee_enabled;
> - e->eee_active = p->eee_active;
> e->tx_lpi_timer = bcmgenet_umac_readl(priv, UMAC_EEE_LPI_TIMER);
>
> return phy_ethtool_get_eee(dev->phydev, e);
> @@ -1336,8 +1332,6 @@ static int bcmgenet_get_eee(struct net_device *dev, struct ethtool_eee *e)
> static int bcmgenet_set_eee(struct net_device *dev, struct ethtool_eee *e)
> {
> struct bcmgenet_priv *priv = netdev_priv(dev);
> - struct ethtool_eee *p = &priv->eee;
> - int ret = 0;
>
> if (GENET_IS_V1(priv))
> return -EOPNOTSUPP;
> @@ -1345,20 +1339,7 @@ static int bcmgenet_set_eee(struct net_device *dev, struct ethtool_eee *e)
> if (!dev->phydev)
> return -ENODEV;
>
> - p->eee_enabled = e->eee_enabled;
> -
> - if (!p->eee_enabled) {
> - bcmgenet_eee_enable_set(dev, false);
> - } else {
> - ret = phy_init_eee(dev->phydev, false);
> - if (ret) {
> - netif_err(priv, hw, dev, "EEE initialization failed\n");
> - return ret;
> - }
> -
> - bcmgenet_umac_writel(priv, e->tx_lpi_timer, UMAC_EEE_LPI_TIMER);
> - bcmgenet_eee_enable_set(dev, true);
> - }
> + bcmgenet_umac_writel(priv, e->tx_lpi_timer, UMAC_EEE_LPI_TIMER);
>
> return phy_ethtool_set_eee(dev->phydev, e);
> }
> @@ -4278,9 +4259,6 @@ static int bcmgenet_resume(struct device *d)
> if (!device_may_wakeup(d))
> phy_resume(dev->phydev);
>
> - if (priv->eee.eee_enabled)
> - bcmgenet_eee_enable_set(dev, true);
> -
> bcmgenet_netif_start(dev);
>
> netif_device_attach(dev);
> diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.h b/drivers/net/ethernet/broadcom/genet/bcmgenet.h
> index 946f6e283c4e..8c9643ec738c 100644
> --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.h
> +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.h
> @@ -644,8 +644,6 @@ struct bcmgenet_priv {
> bool wol_active;
>
> struct bcmgenet_mib_counters mib;
> -
> - struct ethtool_eee eee;
> };
>
> #define GENET_IO_MACRO(name, offset) \
> @@ -703,4 +701,5 @@ int bcmgenet_wol_power_down_cfg(struct bcmgenet_priv *priv,
> void bcmgenet_wol_power_up_cfg(struct bcmgenet_priv *priv,
> enum bcmgenet_power_mode mode);
>
> +void bcmgenet_eee_enable_set(struct net_device *dev, bool eee_active);
> #endif /* __BCMGENET_H__ */
> diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
> index be042905ada2..6c39839762a7 100644
> --- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
> +++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
> @@ -100,6 +100,7 @@ void bcmgenet_mii_setup(struct net_device *dev)
>
> if (phydev->link) {
> bcmgenet_mac_config(dev);
> + bcmgenet_eee_enable_set(dev, phydev->eee_active);
That part is a real bug fix, I do have a tentative patch that I should
be able to submit to 'net' soon after I finish testing a few things with
it. Thanks Andrew!
--
Florian
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