* [PATCH v2] net: sh_eth: do not advertise Gigabit capabilities when not available
@ 2017-12-05 9:29 Thomas Petazzoni
2017-12-05 17:55 ` Andrew Lunn
2017-12-05 19:02 ` Sergei Shtylyov
0 siblings, 2 replies; 4+ messages in thread
From: Thomas Petazzoni @ 2017-12-05 9:29 UTC (permalink / raw)
To: David S. Miller, Sergei Shtylyov, Niklas Söderlund,
Geert Uytterhoeven, Simon Horman
Cc: netdev, linux-renesas-soc, Thomas Petazzoni
Not all variants of the sh_eth hardware have Gigabit
support. Unfortunately, the current driver doesn't tell the PHY about
the limited MAC capabilities. Due to this, if you have a Gigabit
capable PHY, the PHY will advertise its Gigabit capability and
establish a link at 1Gbit/s, even though the MAC doesn't support it.
In order to avoid this, we use the recently introduced
phy_set_max_speed() to tell the PHY to not advertise speed higher than
100 MBit/s.
Tested on a SH7786 platform, with a Gigabit PHY.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
Changes since v1:
- Use phy_set_max_speed(), as suggested by Sergei Shtylyov
<sergei.shtylyov@cogentembedded.com>.
---
drivers/net/ethernet/renesas/sh_eth.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index db72d13cebb9..44ff2835c954 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -1860,6 +1860,7 @@ static int sh_eth_phy_init(struct net_device *ndev)
struct device_node *np = ndev->dev.parent->of_node;
struct sh_eth_private *mdp = netdev_priv(ndev);
struct phy_device *phydev;
+ int err;
mdp->link = 0;
mdp->speed = 0;
@@ -1892,9 +1893,22 @@ static int sh_eth_phy_init(struct net_device *ndev)
return PTR_ERR(phydev);
}
+ /* mask with MAC supported features */
+ if (mdp->cd->register_type != SH_ETH_REG_GIGABIT) {
+ err = phy_set_max_speed(phydev, SPEED_100);
+ if (err) {
+ netdev_err(ndev, "failed to limit PHY to 100 Mbit/s\n");
+ goto err_phy_disconnect;
+ }
+ }
+
phy_attached_info(phydev);
return 0;
+
+err_phy_disconnect:
+ phy_disconnect(phydev);
+ return err;
}
/* PHY control start function */
--
2.13.6
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v2] net: sh_eth: do not advertise Gigabit capabilities when not available
2017-12-05 9:29 [PATCH v2] net: sh_eth: do not advertise Gigabit capabilities when not available Thomas Petazzoni
@ 2017-12-05 17:55 ` Andrew Lunn
2017-12-05 19:02 ` Sergei Shtylyov
1 sibling, 0 replies; 4+ messages in thread
From: Andrew Lunn @ 2017-12-05 17:55 UTC (permalink / raw)
To: Thomas Petazzoni
Cc: David S. Miller, Sergei Shtylyov, Niklas Söderlund,
Geert Uytterhoeven, Simon Horman, netdev, linux-renesas-soc
On Tue, Dec 05, 2017 at 10:29:52AM +0100, Thomas Petazzoni wrote:
> Not all variants of the sh_eth hardware have Gigabit
> support. Unfortunately, the current driver doesn't tell the PHY about
> the limited MAC capabilities. Due to this, if you have a Gigabit
> capable PHY, the PHY will advertise its Gigabit capability and
> establish a link at 1Gbit/s, even though the MAC doesn't support it.
>
> In order to avoid this, we use the recently introduced
> phy_set_max_speed() to tell the PHY to not advertise speed higher than
> 100 MBit/s.
>
> Tested on a SH7786 platform, with a Gigabit PHY.
>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Andrew
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v2] net: sh_eth: do not advertise Gigabit capabilities when not available
2017-12-05 9:29 [PATCH v2] net: sh_eth: do not advertise Gigabit capabilities when not available Thomas Petazzoni
2017-12-05 17:55 ` Andrew Lunn
@ 2017-12-05 19:02 ` Sergei Shtylyov
2017-12-08 15:36 ` Thomas Petazzoni
1 sibling, 1 reply; 4+ messages in thread
From: Sergei Shtylyov @ 2017-12-05 19:02 UTC (permalink / raw)
To: Thomas Petazzoni, David S. Miller, Niklas Söderlund,
Geert Uytterhoeven, Simon Horman
Cc: netdev, linux-renesas-soc
Hello!
On 12/05/2017 12:29 PM, Thomas Petazzoni wrote:
> Not all variants of the sh_eth hardware have Gigabit
> support. Unfortunately, the current driver doesn't tell the PHY about
> the limited MAC capabilities. Due to this, if you have a Gigabit
> capable PHY, the PHY will advertise its Gigabit capability and
> establish a link at 1Gbit/s, even though the MAC doesn't support it.
>
> In order to avoid this, we use the recently introduced
> phy_set_max_speed() to tell the PHY to not advertise speed higher than
> 100 MBit/s.
>
> Tested on a SH7786 platform, with a Gigabit PHY.
>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> ---
> Changes since v1:
> - Use phy_set_max_speed(), as suggested by Sergei Shtylyov
> <sergei.shtylyov@cogentembedded.com>.
> ---
> drivers/net/ethernet/renesas/sh_eth.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
> index db72d13cebb9..44ff2835c954 100644
> --- a/drivers/net/ethernet/renesas/sh_eth.c
> +++ b/drivers/net/ethernet/renesas/sh_eth.c
[...]
> @@ -1892,9 +1893,22 @@ static int sh_eth_phy_init(struct net_device *ndev)
> return PTR_ERR(phydev);
> }
>
> + /* mask with MAC supported features */
> + if (mdp->cd->register_type != SH_ETH_REG_GIGABIT) {
> + err = phy_set_max_speed(phydev, SPEED_100);
> + if (err) {
> + netdev_err(ndev, "failed to limit PHY to 100 Mbit/s\n");
> + goto err_phy_disconnect;
Er, why do we need a *goto* here at all? Just call phy_disconnect() here
and be done with that...
> + }
> + }
> +
> phy_attached_info(phydev);
>
> return 0;
> +
> +err_phy_disconnect:
> + phy_disconnect(phydev);
> + return err;
> }
>
> /* PHY control start function */
MBR, Sergei
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v2] net: sh_eth: do not advertise Gigabit capabilities when not available
2017-12-05 19:02 ` Sergei Shtylyov
@ 2017-12-08 15:36 ` Thomas Petazzoni
0 siblings, 0 replies; 4+ messages in thread
From: Thomas Petazzoni @ 2017-12-08 15:36 UTC (permalink / raw)
To: Sergei Shtylyov
Cc: David S. Miller, Niklas Söderlund, Geert Uytterhoeven,
Simon Horman, netdev, linux-renesas-soc
Hello,
On Tue, 5 Dec 2017 22:02:20 +0300, Sergei Shtylyov wrote:
> > + /* mask with MAC supported features */
> > + if (mdp->cd->register_type != SH_ETH_REG_GIGABIT) {
> > + err = phy_set_max_speed(phydev, SPEED_100);
> > + if (err) {
> > + netdev_err(ndev, "failed to limit PHY to 100 Mbit/s\n");
> > + goto err_phy_disconnect;
>
> Er, why do we need a *goto* here at all? Just call phy_disconnect() here
> and be done with that...
Thanks for the feedback, I've sent a v3 that takes into account this
comment.
Thanks!
Thomas
--
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2017-12-08 15:36 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2017-12-05 9:29 [PATCH v2] net: sh_eth: do not advertise Gigabit capabilities when not available Thomas Petazzoni
2017-12-05 17:55 ` Andrew Lunn
2017-12-05 19:02 ` Sergei Shtylyov
2017-12-08 15:36 ` Thomas Petazzoni
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