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

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Date:   Thu, 10 May 2018 13:32:51 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
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 05/10/2018 01:29 PM, Russell King - ARM Linux wrote:
> 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.

No worries, thanks for looking at this. Andrew and I both tested this on
the devel B and C boards where this is primarily useful. Can I still get
your SoB for the portions you authored?

I will follow up with a change that uses GPIO interrupts when they are
available.

> 
>> ---
>>  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
>>
> 


-- 
Florian