linux-kernel - Re: [PATCH net-next v2 1/2] net: dsa: microchip: ksz8: Make flow control, speed, and duplex on CPU port configurable

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Message-ID: <da74fe43-6972-417e-981e-b7341945ae14@lunn.ch>
Date:   Wed, 17 May 2023 22:35:31 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Vladimir Oltean <olteanv@...il.com>,
        Woojung Huh <woojung.huh@...rochip.com>,
        Arun Ramadoss <arun.ramadoss@...rochip.com>,
        "Russell King (Oracle)" <linux@...linux.org.uk>,
        kernel@...gutronix.de, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net-next v2 1/2] net: dsa: microchip: ksz8: Make flow
 control, speed, and duplex on CPU port configurable

On Wed, May 17, 2023 at 02:10:33PM +0200, Oleksij Rempel wrote:
> Allow flow control, speed, and duplex settings on the CPU port to be
> configurable. Previously, the speed and duplex relied on default switch
> values, which limited flexibility. Additionally, flow control was
> hardcoded and only functional in duplex mode. This update enhances the
> configurability of these parameters.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/net/dsa/microchip/ksz8.h       |  4 +++
>  drivers/net/dsa/microchip/ksz8795.c    | 47 ++++++++++++++++++++++++--
>  drivers/net/dsa/microchip/ksz_common.c |  1 +
>  3 files changed, 50 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/dsa/microchip/ksz8.h b/drivers/net/dsa/microchip/ksz8.h
> index e68465fdf6b9..ec02baca726f 100644
> --- a/drivers/net/dsa/microchip/ksz8.h
> +++ b/drivers/net/dsa/microchip/ksz8.h
> @@ -58,5 +58,9 @@ int ksz8_switch_detect(struct ksz_device *dev);
>  int ksz8_switch_init(struct ksz_device *dev);
>  void ksz8_switch_exit(struct ksz_device *dev);
>  int ksz8_change_mtu(struct ksz_device *dev, int port, int mtu);
> +void ksz8_phylink_mac_link_up(struct ksz_device *dev, int port,
> +			      unsigned int mode, phy_interface_t interface,
> +			      struct phy_device *phydev, int speed, int duplex,
> +			      bool tx_pause, bool rx_pause);
>  
>  #endif
> diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
> index f56fca1b1a22..75b98a5d53af 100644
> --- a/drivers/net/dsa/microchip/ksz8795.c
> +++ b/drivers/net/dsa/microchip/ksz8795.c
> @@ -1371,6 +1371,51 @@ void ksz8_config_cpu_port(struct dsa_switch *ds)
>  	}
>  }
>  
> +/**
> + * ksz8_upstram_link_up - Configures the CPU/upstream port of the switch.

Looks like a typ0: upstream

> +static void ksz8_upstram_link_up(struct ksz_device *dev, int port, int speed,
> +				 int duplex, bool tx_pause, bool rx_pause)
> +{
> +	u8 ctrl = 0;
> +
> +	if (duplex) {
> +		if (tx_pause || rx_pause)
> +			ctrl |= SW_FLOW_CTRL;
> +	} else {
> +		ctrl |= SW_HALF_DUPLEX;
> +		if (tx_pause || rx_pause)
> +			ctrl |= SW_HALF_DUPLEX_FLOW_CTRL;
> +	}
> +
> +	if (speed == SPEED_10)
> +		ctrl |= SW_10_MBIT;

Other speeds don't need to be handled? Maybe a comment why 10 is
special?

	Andrew

---
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