On Mon, May 13, 2019 at 08:45:39PM -0400, Sasha Levin wrote:
> On Mon, May 13, 2019 at 01:18:27PM -0400, George G. Davis wrote:
> >Hello,
> >
> >On Wed, Apr 03, 2019 at 07:12:41PM -0300, Fabio Estevam wrote:
> >>Commit 6d4cd041f0af ("net: phy: at803x: disable delay only for RGMII mode")
> >>exposed an issue on imx DTS files using AR8031/AR8035 PHYs.
> >>
> >>The end result is that the boards can no longer obtain an IP address
> >>via UDHCP, for example.
> >>
> >>Quoting Andrew Lunn:
> >>
> >>"The problem here is, all the DTs were broken since day 0. However,
> >>because the PHY driver was also broken, nobody noticed and it
> >>worked. Now that the PHY driver has been fixed, all the bugs in the
> >>DTs now become an issue"
> >>
> >>To fix this problem, the phy-mode property needs to be "rgmii-id", which
> >>has the following meaning as per
> >>Documentation/devicetree/bindings/net/ethernet.txt:
> >>
> >>"RGMII with internal RX and TX delays provided by the PHY, the MAC should
> >>not add the RX or TX delays in this case)"
> >>
> >>Tested on imx6-sabresd, imx6sx-sdb and imx7d-pico boards with
> >>successfully restored networking.
> >>
> >>Based on the initial submission from Steve Twiss for the
> >>imx6qdl-sabresd.
> >>
> >>Signed-off-by: Fabio Estevam <festevam@xxxxxxxxx>
> >>Tested-by: Baruch Siach <baruch@xxxxxxxxxx>
> >>Tested-by: Soeren Moch <smoch@xxxxxx>
> >>Tested-by: Steve Twiss <stwiss.opensource@xxxxxxxxxxx>
> >>Tested-by: Adam Thomson <Adam.Thomson@xxxxxxxxxxx>
> >>Signed-off-by: Steve Twiss <stwiss.opensource@xxxxxxxxxxx>
> >>Tested-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
> >>Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
> >>---
> >>Changes since v2:
> >>- Also fixed imx6q-ba16
> >>- Removed stable tag as it does not apply cleanly on older
> >>stable trees. I can manually generate versions for stable
> >>trees after this one hits mainline.
> >
> >Please add this commit to the v5.1.x stable queue to resolve NFS root breakage
> >in v5.1. I can confirm that it applies cleanly to v5.1.1 and resolves NFS root
> >breakage that occurs on i.MX6 boards in v5.1.x, tested on imx6q-sabreauto.dts
> >and imx6q-sabresd.dts. Although the fix should be backported to pre-v5.1.x
> >stable series as well, it does not cause problems for pre-v5.1 but results in
> >NFS root breakage for v5.1.x.
>
> What's the commit id in Linus's tree? I don't see it.
Er, um, sorry, it was deferred to linux-next commit 68e9c97161b3 ("serial:
sh-sci: disable DMA for uart_console"), which quite frankly rather annoyed me
personally since linux-next commit 68e9c97161b3 is required to fix a regression
caused by v5.1 commit 6d4cd041f0af. In my opinion, linux-next commit
68e9c97161b3 really should have been pushed to the v5.1 release, earlier, due
to the noted regression, but I'm happy to wait for linux-next commit
68e9c97161b3 to make it to Linus's tree before propagating it to linux-stable.
Meanwhile, I wanted to let you know that v5.1.x is rather broken, in this
regard, on i.MX6 as-is for now.
>
> --
> Thanks,
> Sasha
--
Regards,
George
