netdev - Re: [PATCH net-next v2 3/9] net: phy: phylink: Poll link GPIOs

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Date:   Thu, 10 May 2018 21:29:00 +0100
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, privat@...l-hjelmeland.no, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, davem@...emloft.net,
        sean.wang@...iatek.com, Woojung.Huh@...rochip.com,
        john@...ozen.org, cphealy@...il.com
Subject: Re: [PATCH net-next v2 3/9] net: phy: phylink: Poll link GPIOs

On Thu, May 10, 2018 at 01:17:31PM -0700, Florian Fainelli wrote:
> From: Russell King <rmk+kernel@...linux.org.uk>
> 
> When using a fixed link with a link GPIO, we need to poll that GPIO to
> determine link state changes. This is consistent with what fixed_phy.c does.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

I'd like this to use the GPIO interrupt where available, only falling back
to the timer approach when there's no interrupt.  Unfortunately, I don't
have much time to devote to this at the moment, having recently been away
on vacation, and now having to work on ARM specific issues for probably
all of the remainder of this kernel cycle.

That means I won't have time to test your series on any of the boards
I have available to me.

> ---
>  drivers/net/phy/phylink.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> index 6392b5248cf5..581ce93ecaf9 100644
> --- a/drivers/net/phy/phylink.c
> +++ b/drivers/net/phy/phylink.c
> @@ -19,6 +19,7 @@
>  #include <linux/phylink.h>
>  #include <linux/rtnetlink.h>
>  #include <linux/spinlock.h>
> +#include <linux/timer.h>
>  #include <linux/workqueue.h>
>  
>  #include "sfp.h"
> @@ -54,6 +55,7 @@ struct phylink {
>  	/* The link configuration settings */
>  	struct phylink_link_state link_config;
>  	struct gpio_desc *link_gpio;
> +	struct timer_list link_poll;
>  	void (*get_fixed_state)(struct net_device *dev,
>  				struct phylink_link_state *s);
>  
> @@ -500,6 +502,15 @@ static void phylink_run_resolve(struct phylink *pl)
>  		queue_work(system_power_efficient_wq, &pl->resolve);
>  }
>  
> +static void phylink_fixed_poll(struct timer_list *t)
> +{
> +	struct phylink *pl = container_of(t, struct phylink, link_poll);
> +
> +	mod_timer(t, jiffies + HZ);
> +
> +	phylink_run_resolve(pl);
> +}
> +
>  static const struct sfp_upstream_ops sfp_phylink_ops;
>  
>  static int phylink_register_sfp(struct phylink *pl,
> @@ -572,6 +583,7 @@ struct phylink *phylink_create(struct net_device *ndev,
>  	pl->link_config.an_enabled = true;
>  	pl->ops = ops;
>  	__set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
> +	timer_setup(&pl->link_poll, phylink_fixed_poll, 0);
>  
>  	bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
>  	linkmode_copy(pl->link_config.advertising, pl->supported);
> @@ -905,6 +917,8 @@ void phylink_start(struct phylink *pl)
>  	clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
>  	phylink_run_resolve(pl);
>  
> +	if (pl->link_an_mode == MLO_AN_FIXED && !IS_ERR(pl->link_gpio))
> +		mod_timer(&pl->link_poll, jiffies + HZ);
>  	if (pl->sfp_bus)
>  		sfp_upstream_start(pl->sfp_bus);
>  	if (pl->phydev)
> @@ -929,6 +943,8 @@ void phylink_stop(struct phylink *pl)
>  		phy_stop(pl->phydev);
>  	if (pl->sfp_bus)
>  		sfp_upstream_stop(pl->sfp_bus);
> +	if (pl->link_an_mode == MLO_AN_FIXED && !IS_ERR(pl->link_gpio))
> +		del_timer_sync(&pl->link_poll);
>  
>  	set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
>  	queue_work(system_power_efficient_wq, &pl->resolve);
> -- 
> 2.14.1
> 

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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