[PATCH] net: stmmac: dwmac-rk: Fix ethernet on rk3399 based devices

[andreas at rammhold.de]

On 21:06 04.10.21, Punit Agrawal wrote:
> Andreas Rammhold <andreas at rammhold.de> writes:
> 
> > On 17:20 02.10.21, Jakub Kicinski wrote:
> >> On Sat, 2 Oct 2021 23:33:03 +0200 Andreas Rammhold wrote:
> >> > On 16:02 01.10.21, Jakub Kicinski wrote:
> >> > > On Wed, 29 Sep 2021 23:02:35 +0200 Heiko Stübner wrote:  
> >> > > > On a rk3399-puma which has the described issue,
> >> > > > Tested-by: Heiko Stuebner <heiko at sntech.de>  
> >> > > 
> >> > > Applied, thanks!  
> >> > 
> >> > This also fixed the issue on a RockPi4.
> >> > 
> >> > Will any of you submit this to the stable kernels (as this broke within
> >> > 3.13 for me) or shall I do that?
> >> 
> >> I won't. The patch should be in Linus's tree in around 1 week - at which
> >> point anyone can request the backport.
> >> 
> >> That said, as you probably know, 4.4 is the oldest active stable branch,
> >> the ship has sailed for anything 3.x.
> >
> > I am sorry. I meant 5.13.
> 
> AFAICT, 2d26f6e39afb ("net: stmmac: dwmac-rk: fix unbalanced
> pm_runtime_enable warnings") is not in 5.13 stable.
> 
> Either you're not using the stable kernel or there's another issue
> breaking things on the RockPi4.

I was using the 5.13 branch, somewhere after 5.13.12 the network started
to fail on bootup. Due to the nature of the system I don't have
persistent logs on it. When I next looked at the system (and updated to
5.14.x) the issue still occured until I applied this patch on to 5.14.8.
Might have been the same use-facing issue but different bugs?

I can try to narrow the issue down further. It'll probably take a few
evenings to test this out.