On Fri, Mar 13, 2026 at 09:33:18AM +0100, Luca Weiss wrote:
> Hi Mahadevan,
>
> On Thu Jan 1, 2026 at 6:04 AM CET, Mahadevan P wrote:
> > On SC7280 targets, display modes with a width greater than the
> > max_mixer_width (2400) are rejected during mode validation when
> > merge3d is disabled. This limitation exists because, without a
> > 3D merge block, two layer mixers cannot be combined(non-DSC interface),
> > preventing large layers from being split across mixers. As a result,
> > higher resolution modes cannot be supported.
> >
> > Enable merge3d support on SC7280 to allow combining streams from
> > two layer mixers into a single non-DSC interface. This capability
> > removes the width restriction and enables buffer sizes beyond the
> > 2400-pixel limit.
> >
> > Fixes: 591e34a091d1 ("drm/msm/disp/dpu1: add support for display for SC7280
> > target")
> > Signed-off-by: Mahadevan P <[email protected]>
>
> This patch is causing display regression on QCM6490 fairphone-fp5.
>
> With this patch in 7.0-rc3 (or 6.18.16) there's just pink noise on the
> screen. When reverting this patch everything becomes working again.
>
> See also
> https://salsa.debian.org/Mobian-team/devices/kernels/qcom-linux/-/issues/41
>
> @Dmitry: Can we revert this for later 7.0-rc, in case it's not fixed
> quickly?
Could you please provide the resource allocation parts of
debugfs/dri/0/state for both working and non-working cases?
>
> Regards
> Luca
>
> #regzbot introduced: 2892de3f4f985fa779c330468e2f341fdb762ccd
>
--
With best wishes
Dmitry
