netdev - Re: [PATCH] net: ethernet: xilinx_emaclite: keep protocol selector bits by reading ANAR

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Date:	Wed, 29 May 2013 18:59:29 +0200
From:	Michal Simek <monstr@...str.eu>
To:	"Jens Renner (EFE)" <renner@...-gmbh.de>
CC:	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH] net: ethernet: xilinx_emaclite: keep protocol selector
 bits by reading ANAR

On 05/29/2013 06:54 PM, Jens Renner (EFE) wrote:
> Am 29.05.2013 17:23, schrieb Michal Simek:
>> On 05/28/2013 06:10 PM, Jens Renner (EFE) wrote:
>>> This patch reads the PHY's MII_ADVERTISE register (ANAR) before modifying
>>> it. Hence, the protocol selector bits (4:0) which indicate IEEE 803.3u
>>> support are prevented from being cleared. While the selector bits are
>>> fixed / read-only on some PHYs, not setting them correctly on others
>>> (like TI DP83630) makes the PHY fall back to 10/half mode which should be
>>> avoided.
>>>
>>> Signed-off-by: Jens Renner <renner@...-gmbh.de> --- 
>>> drivers/net/ethernet/xilinx/xilinx_emaclite.c               |    7
>>> +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/net/ethernet/xilinx/xilinx_emaclite.c
>>> b/drivers/net/ethernet/xilinx/xilinx_emaclite.c index 919b983..4a67af1
>>> 100644 --- a/drivers/net/ethernet/xilinx/xilinx_emaclite.c +++
>>> b/drivers/net/ethernet/xilinx/xilinx_emaclite.c @@ -922,7 +922,7 @@ void
>>> xemaclite_adjust_link(struct net_device *ndev) static int
>>> xemaclite_open(struct net_device *dev) { struct net_local *lp =
>>> netdev_priv(dev); -       int retval; +       int retval, adv;
>>>
>>> /* Just to be safe, stop the device first */ 
>>> xemaclite_disable_interrupts(lp); @@ -946,7 +946,10 @@ static int
>>> xemaclite_open(struct net_device *dev) phy_write(lp->phy_dev,
>>> MII_CTRL1000, 0);
>>>
>>> /* Advertise only 10 and 100mbps full/half duplex speeds */ -
>>> phy_write(lp->phy_dev, MII_ADVERTISE, ADVERTISE_ALL); +               adv
>>> = phy_read(lp->phy_dev, MII_ADVERTISE); +               if (adv < 0) +
>>> return adv; +               phy_write(lp->phy_dev, MII_ADVERTISE, adv |
>>> ADVERTISE_ALL);
>>>
>>> /* Restart auto negotiation */ bmcr = phy_read(lp->phy_dev, MII_BMCR);
>>
>> Acked-by: Michal Simek <monstr@...str.eu>
>>
>> Thanks, Michal
>>
>>
> 
> Michal, please mind the follow-ups to my original list mail:
> http://lists.openwall.net/netdev/2013/05/28/126
> http://lists.openwall.net/netdev/2013/05/29/140
> There will be a patch v2 later this day (I will put you in CC).

Ok. I have tested it on xilinx qemu model and your patch doesn't
break our existing driver usage that's why I gave you my ACK.
And yes, please CC me I will retest your v2.

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform



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