linux-kernel - Re: [PATCH net-next v7 3/7] net: stmmac: Make stmmac_xpcs

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Date: Mon, 13 May 2024 14:18:55 +0300
From: Serge Semin <fancer.lancer@...il.com>
To: Romain Gantois <romain.gantois@...tlin.com>
Cc: "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Geert Uytterhoeven <geert+renesas@...der.be>, Magnus Damm <magnus.damm@...il.com>, 
	Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu <joabreu@...opsys.com>, 
	Maxime Coquelin <mcoquelin.stm32@...il.com>, Russell King <linux@...linux.org.uk>, 
	Clément Léger <clement.leger@...tlin.com>, Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
	netdev@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-renesas-soc@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Subject: Re: [PATCH net-next v7 3/7] net: stmmac: Make stmmac_xpcs_setup()
 generic to all PCS devices

On Mon, May 13, 2024 at 09:25:14AM +0200, Romain Gantois wrote:
> From: Serge Semin <fancer.lancer@...il.com>
> 
> A pcs_init() callback will be introduced to stmmac in a future patch. This
> new function will be called during the hardware initialization phase.
> Instead of separately initializing XPCS and PCS components, let's group all
> PCS-related hardware initialization logic in the current
> stmmac_xpcs_setup() function.
> 
> Rename stmmac_xpcs_setup() to stmmac_pcs_setup() and move the conditional
> call to stmmac_xpcs_setup() inside the function itself.
> 
> Signed-off-by: Serge Semin <fancer.lancer@...il.com>
> Co-developed-by: Romain Gantois <romain.gantois@...tlin.com>
> Signed-off-by: Romain Gantois <romain.gantois@...tlin.com>
> Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>

Looking good. Thanks.

-Serge(y)

> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac.h      |  2 +-
>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 10 +++-----
>  drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 30 ++++++++++++++---------
>  3 files changed, 23 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
> index badfe686a5702..ed38099ca7406 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
> @@ -360,7 +360,7 @@ enum stmmac_state {
>  int stmmac_mdio_unregister(struct net_device *ndev);
>  int stmmac_mdio_register(struct net_device *ndev);
>  int stmmac_mdio_reset(struct mii_bus *mii);
> -int stmmac_xpcs_setup(struct mii_bus *mii);
> +int stmmac_pcs_setup(struct net_device *ndev);
>  void stmmac_pcs_clean(struct net_device *ndev);
>  void stmmac_set_ethtool_ops(struct net_device *netdev);
>  
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 0ac99c132733d..ef285b3c56ab9 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -7754,11 +7754,9 @@ int stmmac_dvr_probe(struct device *device,
>  	if (priv->plat->speed_mode_2500)
>  		priv->plat->speed_mode_2500(ndev, priv->plat->bsp_priv);
>  
> -	if (priv->plat->mdio_bus_data && priv->plat->mdio_bus_data->has_xpcs) {
> -		ret = stmmac_xpcs_setup(priv->mii);
> -		if (ret)
> -			goto error_xpcs_setup;
> -	}
> +	ret = stmmac_pcs_setup(ndev);
> +	if (ret)
> +		goto error_pcs_setup;
>  
>  	ret = stmmac_phy_setup(priv);
>  	if (ret) {
> @@ -7791,7 +7789,7 @@ int stmmac_dvr_probe(struct device *device,
>  	phylink_destroy(priv->phylink);
>  error_phy_setup:
>  	stmmac_pcs_clean(ndev);
> -error_xpcs_setup:
> +error_pcs_setup:
>  	if (priv->hw->pcs != STMMAC_PCS_TBI &&
>  	    priv->hw->pcs != STMMAC_PCS_RTBI)
>  		stmmac_mdio_unregister(ndev);
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> index 73ba9901a4439..54708440e27b8 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> @@ -495,31 +495,37 @@ int stmmac_mdio_reset(struct mii_bus *bus)
>  	return 0;
>  }
>  
> -int stmmac_xpcs_setup(struct mii_bus *bus)
> +int stmmac_pcs_setup(struct net_device *ndev)
>  {
> -	struct net_device *ndev = bus->priv;
> +	struct dw_xpcs *xpcs = NULL;
>  	struct stmmac_priv *priv;
> -	struct dw_xpcs *xpcs;
> +	int ret = -ENODEV;
>  	int mode, addr;
>  
>  	priv = netdev_priv(ndev);
>  	mode = priv->plat->phy_interface;
>  
> -	/* Try to probe the XPCS by scanning all addresses. */
> -	for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
> -		xpcs = xpcs_create_mdiodev(bus, addr, mode);
> -		if (IS_ERR(xpcs))
> -			continue;
> +	if (priv->plat->mdio_bus_data && priv->plat->mdio_bus_data->has_xpcs) {
> +		/* Try to probe the XPCS by scanning all addresses */
> +		for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
> +			xpcs = xpcs_create_mdiodev(priv->mii, addr, mode);
> +			if (IS_ERR(xpcs))
> +				continue;
>  
> -		priv->hw->xpcs = xpcs;
> -		break;
> +			ret = 0;
> +			break;
> +		}
> +	} else {
> +		return 0;
>  	}
>  
> -	if (!priv->hw->xpcs) {
> +	if (ret) {
>  		dev_warn(priv->device, "No xPCS found\n");
> -		return -ENODEV;
> +		return ret;
>  	}
>  
> +	priv->hw->xpcs = xpcs;
> +
>  	return 0;
>  }
>  
> 
> -- 
> 2.44.0
>