Re: [PATCH for 6.12 3/9] drm/amd/display: Disable fastboot on DCE 6 too

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Mon, Mar 30, 2026 at 02:38:35PM -0700, Rosen Penev wrote:
> On Mon, Mar 30, 2026 at 7:21 AM Timur Kristóf <timur.kristof@gmail.com> wrote:
> >
> > On Monday, March 30, 2026 3:55:55 PM Central European Summer Time Christian
> > König wrote:
> > > On 3/30/26 15:16, Timur Kristóf wrote:
> > > > On Friday, March 27, 2026 12:47:10 AM Central European Summer Time Rosen
> > > > Penev>
> > > > wrote:
> > > >> From: Timur Kristóf <timur.kristof@gmail.com>
> > > >>
> > > >> [ Upstream commit 7495962cbceb967e095233a5673ea71f3bcdee7e ]
> > > >>
> > > >> It already didn't work on DCE 8,
> > > >> so there is no reason to assume it would on DCE 6.
> > > >>
> > > >> Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
> > > >> Reviewed-by: Rodrigo Siqueira <siqueira@igalia.com>
> > > >> Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
> > > >> Reviewed-by: Alex Hung <alex.hung@amd.com>
> > > >> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
> > > >> Signed-off-by: Rosen Penev <rosenp@gmail.com>
> > > >
> > > > This patch is incorrect and should not be backported.
> > > >
> > > > (Note that the error is already fixed upstream. For stable kernels IMO
> > > > it's
> > > > best to drop this one.)
> > >
> > > Is there some alternative which needs to be backported or should the old
> > > kernel just work out of the box because we never enabled some feature
> > > there?
> > >
> > > Apart from that the patch set looks good to me.
> > >
> >
> > This patch had a typo and does the opposite of what it should, ie. it disables
> > eDP fastboot on DCE10 and newer instead of disabling it on DCE8 and older.
> >
> > The upstream fix is here:
> > https://lists.freedesktop.org/archives/amd-gfx/2026-February/138577.html
> > which disables eDP fastboot on DCE10 and older.
> Not sure what the process is here. I make sure everything can be git
> cherry-pick ed. In that case, both should be present.

I agree, I don't understand the problem here.  Just take the commits
that are upstream including "fixes for the fixes".

Timur, what specifically do you want to see happen here?

thanks,

greg k-h