netdev - Re: [PATCH net] ravb: Add disable 10base

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Date:	Mon, 14 Dec 2015 10:49:56 -0800
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Simon Horman <horms@...ge.net.au>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
CC:	Yoshihiro Kaneko <ykaneko0929@...il.com>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Magnus Damm <magnus.damm@...il.com>, linux-sh@...r.kernel.org
Subject: Re: [PATCH net] ravb: Add disable 10base

On 13/12/15 20:53, Simon Horman wrote:
> [Cc Florian]
> 
> On Sun, Dec 13, 2015 at 08:17:48PM +0300, Sergei Shtylyov wrote:
>> Hello.
>>
>> On 12/13/2015 06:15 PM, Yoshihiro Kaneko wrote:
>>
>>> From: Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>
>>>
>>> Ethernet AVB does not support 10 Mbps transfer speed.
>>>
>>> Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>
>>> Signed-off-by: Yoshihiro Kaneko <ykaneko0929@...il.com>
>>> ---
>>>
>>> This patch is based on the master branch of David Miller's networking
>>> tree.
>>>
>>>  drivers/net/ethernet/renesas/ravb_main.c | 3 +++
>>>  1 file changed, 3 insertions(+)
>>>
>>> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
>>> index b69e0c2..467d416 100644
>>> --- a/drivers/net/ethernet/renesas/ravb_main.c
>>> +++ b/drivers/net/ethernet/renesas/ravb_main.c
>>> @@ -905,6 +905,9 @@ static int ravb_phy_init(struct net_device *ndev)
>>>  		netdev_info(ndev, "limited PHY to 100Mbit/s\n");
>>>  	}
>>>
>>> +	/* 10BASE is not supported */
>>> +	phydev->supported &= ~PHY_10BT_FEATURES;
>>> +
>>
>>    Perhaps we need phy_set_min_speed() in addition to phy_set_max_speed()?
> 
> FWIW, as the person who added phy_set_max_speed(), I think
> that is sounds like a good idea.

I am not opposed to the idea, but so far, it seems like setting the
minimum supported speed was a little less frequent than setting the
maximum speed. Feel free to submit a patch though if you think/know
there are other drivers potentially using this.
-- 
Florian
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