Re: [PATCH v5 3/6] drm/mipi-dsi: Add flag to support dual-panel configurations

[Dmitry Baryshkov]

On Wed, Sep 30, 2026 at 09:52:48PM +0800, Jun Nie wrote:
> Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx> 于2026年9月30日周三 00:05写道：
> >
> > On Mon, Jul 27, 2026 at 04:08:42PM +0800, Jun Nie wrote:
> > > Some devices treat two independent physical DSI panels as a single
> > > logical panel from the CRTC's perspective. However, two separate DSI
> > > hosts are still required to drive the panels individually.
> > >
> > > Introduce a `dual_panel` flag to the `mipi_dsi_device` struct. This
> > > allows a panel driver to inform the DSI host that it is part of a
> > > dual-panel setup, enabling the host to coordinate both physical
> > > displays as one.
> > >
> > > This change does not force individual panel driver to manage
> > > system-level display topology if the driver does not intended to
> > > support dual panel topology. Only the driver that set the flag to
> > > true need to take care of panel topology.
> > >
> > > Signed-off-by: Jun Nie <jun.nie@xxxxxxxxxx>
> > > ---
> > >  include/drm/drm_mipi_dsi.h | 2 ++
> > >  1 file changed, 2 insertions(+)
> >
> > Do you have a single MIPI DSI device, or are there two independent MIPI
> > DSI devices? In the latter case, the flag is wrongly placed.
> 
> Yes, there are 2 mipi devices, and 2 mipi hosts. This flag is used for
> mipi device
> to notify host they are one of dual panels, so that horizontal
> configuration(width)
> in mipi host can be handled correctly. Where do you suggest to put this flag?
> Thanks!

Into the msm DSI structures. We already have several Qualcomm-specific
flags. I'm thinking from the 'generic device' point of view. The
'dual_panel' doesn't mean anything if the device has more than two DSI
hosts. You need to specify which hosts are mapped to L or R channels, etc.

-- 
With best wishes
Dmitry