Re: display band (display area vs real visible area)

[Jani Nikula <jani.nikula@linux.intel.com>]

On Tue, 21 Mar 2023, Michael Nazzareno Trimarchi <michael@amarulasolutions.com> wrote:
> Hi
>
> On Tue, Mar 21, 2023 at 11:43 AM Jani Nikula
> <jani.nikula@linux.intel.com> wrote:
>>
>> On Tue, 21 Mar 2023, Michael Nazzareno Trimarchi <michael@amarulasolutions.com> wrote:
>> > Hi all
>> >
>> > I would like to know the best approach in the graphics subsystem how
>> > deal with panels where the display area is different from the visible
>> > area because the display has a band left and right. I have already
>> > done the drm driver for the panel but from userspace point of view
>> > it's a pain to deal in wayland for input device and output device. Do
>> > you have any suggestions?
>>
>> Do you have the EDID for the panel?
>
> mipi->panel so should not have edid

That's the kind of information you'd expect in the original question. ;)

I've done that sort of thing in the past, but not sure if it would fly
upstream. Basically the kernel driver would lie about the resolution to
userspace, and handle the centering and the bands internally. In my
case, the DSI command mode panel in question had commands to set the
visible area, so the driver didn't have to do all that much extra to
make it happen.

BR,
Jani.

-- 
Jani Nikula, Intel Open Source Graphics Center