netdev - Re: [PATCH net] gianfar: Don't force RGMII mode after reset, use defaults

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Date:   Thu, 21 Nov 2019 15:58:31 +0000
From:   "Daniel Walker (danielwa)" <danielwa@...co.com>
To:     Claudiu Manoil <claudiu.manoil@....com>
CC:     "David S . Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net] gianfar: Don't force RGMII mode after reset, use
 defaults

On Tue, Nov 12, 2019 at 04:55:11PM +0200, Claudiu Manoil wrote:
> We received reports that forcing the MAC into RGMII (1 Gbps)
> interface mode after MAC reset occasionally disrupts operation
> of PHYs capable only of 100Mbps, even after adjust_link kicks
> in and re-adjusts the interface mode in MACCFG2 accordingly.
> Instead of forcing MACCFG2 into RGMII mode, let's use the default
> reset value of MACCFG2 (that leaves the IF_Mode field unset) and
> let adjust_link configure the correct mode from the beginning.
> MACCFG2_INIT_SETTINGS is dropped, only the PAD_CRC bit is preserved,
> the remaining fields (IF_Mode and Duplex) are left for adjust_link.
> Tested on boards with gigabit PHYs.
> 
> MACCFG2_INIT_SETTINGS is there since day one, but the issue
> got visible after introducing the MAC reset and reconfig support,
> which added MAC reset at runtime, at interface open.
> 
> Fixes: a328ac92d314 ("gianfar: Implement MAC reset and reconfig procedure")
> 


We tested these changes on our side, and it appears to solve the problem.
Have been able to resolve the issues which you have seen on your side?


Daniel