Hi Linus, Am Samstag, 3. Dezember 2022, 10:03:42 CET schrieb Linus Walleij: > On Tue, Nov 29, 2022 at 6:29 PM Chris Morgan <macroalpha82@xxxxxxxxx> wrote: > > > From: Chris Morgan <macromorgan@xxxxxxxxxxx> > > > > Support Samsung AMS495QA01 panel as found on the Anbernic RG503. Note > > This panel receives video signals via DSI, however it receives > > commands via 3-wire SPI. > > > > Signed-off-by: Chris Morgan <macromorgan@xxxxxxxxxxx> > > Signed-off-by: Maya Matuszczyk <maccraft123mc@xxxxxxxxx> > > > +config DRM_PANEL_SAMSUNG_AMS495QA01 > > + tristate "Samsung AMS495QA01 DSI panel" > > I am always a bit careful with these "Samsung" panels. Well the > panel is surely Samsungs and usually it has that name, but very often > it is mainly a display controller, made by someone else, then a physical > panel slapped on and then the actual display controller is obscured. > > Typical example: > panel-novatek-nt35560.c handing Samsung ACX424AKP. > > If you know the actual display controller, then the driver should be > renamed after that, but keeping the compatible and DT bindings > as is. The reason being that tomorrow there is an LG panel > using the same display controller and then we don't get duplicate > code. > > It feels like this is a Novatek controller. Just a feeling I have. > Mostly from the way it does brightness using ELVSS and > gamma. But who knows. Though in past projects I've seen the same display-controller used with different panels (and different dsi-init-sequences). In one project the display manufacturer even EOL'ed the first panel and provided a replacement with said same display controller (and a different init) - but the datasheets for the display-controller were for the same chip still. So while in my experience the actual display name from the manufacturer identifies the display + controller combo, I don't really think you can go the other way with the controller name identifying the display+controller combination. But that whole display business is arcane anyway, so this also only stems from past projects and not factual knowledge ;-) . Heiko
