Re: [PATCH 2/2] Revert "drm/amd/pm: Disable SCLK switching on Oland with high pixel clocks (v3)"

[Rosen Penev <rosenp@gmail.com>]

On Fri, Feb 20, 2026 at 10:33 PM Greg KH <gregkh@linuxfoundation.org> wrote:
>
> On Fri, Feb 20, 2026 at 09:52:29PM -0800, Rosen Penev wrote:
> > On Fri, Feb 20, 2026 at 9:41 PM Greg KH <gregkh@linuxfoundation.org> wrote:
> > >
> > > On Fri, Feb 20, 2026 at 07:44:02PM -0800, Rosen Penev wrote:
> > > > This reverts commit 0bb91bed82d414447f2e56030d918def6383c026.
> > > >
> > > > This commit breaks stable kernels older than 6.18 that are booted with
> > > > radeon.si_support=0 amdgpu.si_support=1 amdgpu.dc=1
> > > >
> > > > In 6.17, threre are further commits that are needed to get the DC
> > > > codepath in amdgpu for Southern Islands GPUs working but they seem to be
> > > > too much of a hastle to backport cleanly. The simplest solution is to
> > > > revert this problematic commit
> > >
> > > Ok, this is better, but still, this only applies to 6.12.y, right?
> > The reverted commit (or rather the one from master) was backported to
> > at least 6.12 and 6.6. I didn't check what other kernels include it.
>
> I see it in the following kernel releases:
>         6.1.156 6.6.112 6.12.53 6.17.3 6.18
>
> All except 6.17.y is currently being supported.
Yes. I complained about 6.17 being broken at the time and luckily the
proper fixes got backported to 6.17. There's no issue there.

Those fixes are too involved to be cleanly backported to older
kernels, hence the revert being needed.

I'll mention 6.1 in v2.
>
> thanks,
>
> greg k-h